fixes for destructive track offsets of various kinds; move from jack_nframes_t -...
[ardour.git] / libs / ardour / session.cc
index 9b581ce79077df0b9f275a87cc25a5eab61254f1..2cf86434d7cbcab1941dd70cf4494ab2b81124e7 100644 (file)
 #include <sigc++/bind.h>
 #include <sigc++/retype.h>
 
+#include <glibmm/thread.h>
+#include <glibmm/miscutils.h>
+
 #include <pbd/error.h>
-#include <pbd/lockmonitor.h>
+#include <glibmm/thread.h>
 #include <pbd/pathscanner.h>
 #include <pbd/stl_delete.h>
 #include <pbd/basename.h>
-#include <pbd/dirname.h>
 
 #include <ardour/audioengine.h>
 #include <ardour/configuration.h>
 #include <ardour/session.h>
-#include <ardour/diskstream.h>
+#include <ardour/audio_diskstream.h>
 #include <ardour/utils.h>
 #include <ardour/audioplaylist.h>
 #include <ardour/audioregion.h>
-#include <ardour/source.h>
-#include <ardour/filesource.h>
+#include <ardour/audiofilesource.h>
 #include <ardour/destructive_filesource.h>
-#include <ardour/sndfilesource.h>
 #include <ardour/auditioner.h>
 #include <ardour/recent_sessions.h>
 #include <ardour/redirect.h>
 #include <ardour/crossfade.h>
 #include <ardour/playlist.h>
 #include <ardour/click.h>
-#include <ardour/timestamps.h>
+#include <ardour/data_type.h>
+#include <ardour/source_factory.h>
+
+#ifdef HAVE_LIBLO
+#include <ardour/osc.h>
+#endif
 
 #include "i18n.h"
 
 using namespace std;
 using namespace ARDOUR;
-//using namespace sigc;
+using namespace PBD;
+using boost::shared_ptr;
 
 const char* Session::_template_suffix = X_(".template");
 const char* Session::_statefile_suffix = X_(".ardour");
 const char* Session::_pending_suffix = X_(".pending");
-const char* Session::sound_dir_name = X_("sounds");
-const char* Session::tape_dir_name = X_("tapes");
+const char* Session::old_sound_dir_name = X_("sounds");
+const char* Session::sound_dir_name = X_("audiofiles");
 const char* Session::peak_dir_name = X_("peaks");
 const char* Session::dead_sound_dir_name = X_("dead_sounds");
+const char* Session::interchange_dir_name = X_("interchange");
 
 Session::compute_peak_t                                Session::compute_peak                   = 0;
 Session::apply_gain_to_buffer_t                Session::apply_gain_to_buffer   = 0;
@@ -86,6 +93,11 @@ Session::mix_buffers_with_gain_t     Session::mix_buffers_with_gain  = 0;
 Session::mix_buffers_no_gain_t         Session::mix_buffers_no_gain    = 0;
 
 sigc::signal<int> Session::AskAboutPendingState;
+sigc::signal<void> Session::SendFeedback;
+
+sigc::signal<void> Session::SMPTEOffsetChanged;
+sigc::signal<void> Session::StartTimeChanged;
+sigc::signal<void> Session::EndTimeChanged;
 
 int
 Session::find_session (string str, string& path, string& snapshot, bool& isnew)
@@ -248,22 +260,31 @@ Session::Session (AudioEngine &eng,
          _midi_port (default_midi_port),
          pending_events (2048),
          midi_requests (128), // the size of this should match the midi request pool size
+         diskstreams (new DiskstreamList),
+         routes (new RouteList),
+         auditioner ((Auditioner*) 0),
+         _click_io ((IO*) 0),
          main_outs (0)
 {
        bool new_session;
 
-       cerr << "Loading session " << fullpath << " using snapshot " << snapshot_name << endl;
+       cerr << "Loading session " << fullpath << " using snapshot " << snapshot_name << " (1)" << endl;
 
        n_physical_outputs = _engine.n_physical_outputs();
        n_physical_inputs =  _engine.n_physical_inputs();
 
        first_stage_init (fullpath, snapshot_name);
        
-       if (create (new_session, mix_template, _engine.frame_rate() * 60 * 5)) {
-               throw failed_constructor ();
+       new_session = !g_file_test (_path.c_str(), GFileTest (G_FILE_TEST_EXISTS | G_FILE_TEST_IS_DIR));
+       if (new_session) {
+               if (create (new_session, mix_template, _engine.frame_rate() * 60 * 5)) {
+                       cerr << "create failed\n";
+                       throw failed_constructor ();
+               }
        }
        
        if (second_stage_init (new_session)) {
+               cerr << "2nd state failed\n";
                throw failed_constructor ();
        }
        
@@ -273,6 +294,8 @@ Session::Session (AudioEngine &eng,
 
        _state_of_the_state = StateOfTheState (_state_of_the_state & ~Dirty);
 
+       Config->ParameterChanged.connect (mem_fun (*this, &Session::config_changed));
+
        if (was_dirty) {
                DirtyChanged (); /* EMIT SIGNAL */
        }
@@ -287,7 +310,7 @@ Session::Session (AudioEngine &eng,
                  uint32_t master_out_channels,
                  uint32_t requested_physical_in,
                  uint32_t requested_physical_out,
-                 jack_nframes_t initial_length)
+                 nframes_t initial_length)
 
        : _engine (eng),
          _mmc_port (default_mmc_port),
@@ -295,33 +318,40 @@ Session::Session (AudioEngine &eng,
          _midi_port (default_midi_port),
          pending_events (2048),
          midi_requests (16),
+         diskstreams (new DiskstreamList),
+         routes (new RouteList),
          main_outs (0)
 
 {
        bool new_session;
 
-       cerr << "Loading session " << fullpath << " using snapshot " << snapshot_name << endl;
+       cerr << "Loading session " << fullpath << " using snapshot " << snapshot_name << " (2)" << endl;
 
        n_physical_outputs = max (requested_physical_out, _engine.n_physical_outputs());
        n_physical_inputs = max (requested_physical_in, _engine.n_physical_inputs());
 
        first_stage_init (fullpath, snapshot_name);
-       
-       if (create (new_session, 0, initial_length)) {
-               throw failed_constructor ();
+
+       new_session = !g_file_test (_path.c_str(), GFileTest (G_FILE_TEST_EXISTS | G_FILE_TEST_IS_DIR));
+       if (new_session) {
+               if (create (new_session, 0, initial_length)) {
+                       throw failed_constructor ();
+               }
        }
 
        if (control_out_channels) {
-               Route* r;
-               r = new Route (*this, _("monitor"), -1, control_out_channels, -1, control_out_channels, Route::ControlOut);
-               add_route (r);
+               shared_ptr<Route> r (new Route (*this, _("monitor"), -1, control_out_channels, -1, control_out_channels, Route::ControlOut));
+               RouteList rl;
+               rl.push_back (r);
+               add_routes (rl);
                _control_out = r;
        }
 
        if (master_out_channels) {
-               Route* r;
-               r = new Route (*this, _("master"), -1, master_out_channels, -1, master_out_channels, Route::MasterOut);
-               add_route (r);
+               shared_ptr<Route> r (new Route (*this, _("master"), -1, master_out_channels, -1, master_out_channels, Route::MasterOut));
+               RouteList rl;
+               rl.push_back (r);
+               add_routes (rl);
                _master_out = r;
        } else {
                /* prohibit auto-connect to master, because there isn't one */
@@ -356,12 +386,25 @@ Session::~Session ()
 
        _state_of_the_state = StateOfTheState (CannotSave|Deletion);
        _engine.remove_session ();
+
+       GoingAway (); /* EMIT SIGNAL */
        
-       going_away (); /* EMIT SIGNAL */
+       /* do this */
+
+       notify_callbacks ();
+
+       /* clear history so that no references to objects are held any more */
+
+       history.clear ();
+
+       /* clear state tree so that no references to objects are held any more */
        
+       if (state_tree) {
+               delete state_tree;
+       }
+
        terminate_butler_thread ();
        terminate_midi_thread ();
-       terminate_feedback ();
        
        if (click_data && click_data != default_click) {
                delete [] click_data;
@@ -373,15 +416,6 @@ Session::~Session ()
 
        clear_clicks ();
 
-       if (_click_io) {
-               delete _click_io;
-       }
-
-
-       if (auditioner) {
-               delete auditioner;
-       }
-
        for (vector<Sample*>::iterator i = _passthru_buffers.begin(); i != _passthru_buffers.end(); ++i) {
                free(*i);
        }
@@ -394,9 +428,7 @@ Session::~Session ()
                free(*i);
        }
 
-       for (map<RunContext,char*>::iterator i = _conversion_buffers.begin(); i != _conversion_buffers.end(); ++i) {
-               delete [] (i->second);
-       }
+       AudioDiskstream::free_working_buffers();
        
 #undef TRACK_DESTRUCTION
 #ifdef TRACK_DESTRUCTION
@@ -429,56 +461,57 @@ Session::~Session ()
 #ifdef TRACK_DESTRUCTION
        cerr << "delete audio regions\n";
 #endif /* TRACK_DESTRUCTION */
-       for (AudioRegionList::iterator i = audio_regions.begin(); i != audio_regions.end(); ) {
-               AudioRegionList::iterator tmp;
-
-               tmp =i;
-               ++tmp;
-
-               delete (*i).second;
-
-               i = tmp;
+       
+       for (AudioRegionList::iterator i = audio_regions.begin(); i != audio_regions.end(); ++i) {
+               i->second->drop_references ();
        }
+
+       audio_regions.clear ();
        
 #ifdef TRACK_DESTRUCTION
        cerr << "delete routes\n";
 #endif /* TRACK_DESTRUCTION */
-       for (RouteList::iterator i = routes.begin(); i != routes.end(); ) {
-               RouteList::iterator tmp;
-               tmp = i;
-               ++tmp;
-               delete *i;
-               i = tmp;
+        {
+               RCUWriter<RouteList> writer (routes);
+               boost::shared_ptr<RouteList> r = writer.get_copy ();
+               for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
+                       (*i)->drop_references ();
+               }
+               r->clear ();
+               /* writer goes out of scope and updates master */
        }
 
+       routes.flush ();
+
 #ifdef TRACK_DESTRUCTION
        cerr << "delete diskstreams\n";
 #endif /* TRACK_DESTRUCTION */
-       for (DiskStreamList::iterator i = diskstreams.begin(); i != diskstreams.end(); ) {
-               DiskStreamList::iterator tmp;
-
-               tmp = i;
-               ++tmp;
-
-               delete *i;
-
-               i = tmp;
-       }
+       {
+              RCUWriter<DiskstreamList> dwriter (diskstreams);
+              boost::shared_ptr<DiskstreamList> dsl = dwriter.get_copy();
+              for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
+                      (*i)->drop_references ();
+              }
+              dsl->clear ();
+       }
+       diskstreams.flush ();
 
 #ifdef TRACK_DESTRUCTION
-       cerr << "delete sources\n";
+       cerr << "delete audio sources\n";
 #endif /* TRACK_DESTRUCTION */
-       for (SourceList::iterator i = sources.begin(); i != sources.end(); ) {
-               SourceList::iterator tmp;
+       for (AudioSourceList::iterator i = audio_sources.begin(); i != audio_sources.end(); ) {
+               AudioSourceList::iterator tmp;
 
                tmp = i;
                ++tmp;
 
-               delete (*i).second;
+               i->second->drop_references ();
 
                i = tmp;
        }
 
+       audio_sources.clear ();
+
 #ifdef TRACK_DESTRUCTION
        cerr << "delete mix groups\n";
 #endif /* TRACK_DESTRUCTION */
@@ -534,14 +567,10 @@ Session::~Session ()
        if (mmc) {
                delete mmc;
        }
-
-       if (state_tree) {
-               delete state_tree;
-       }
 }
 
 void
-Session::set_worst_io_latencies (bool take_lock)
+Session::set_worst_io_latencies ()
 {
        _worst_output_latency = 0;
        _worst_input_latency = 0;
@@ -550,18 +579,12 @@ Session::set_worst_io_latencies (bool take_lock)
                return;
        }
 
-       if (take_lock) {
-               route_lock.read_lock ();
-       }
+       boost::shared_ptr<RouteList> r = routes.reader ();
        
-       for (RouteList::iterator i = routes.begin(); i != routes.end(); ++i) {
+       for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
                _worst_output_latency = max (_worst_output_latency, (*i)->output_latency());
                _worst_input_latency = max (_worst_input_latency, (*i)->input_latency());
        }
-
-       if (take_lock) {
-               route_lock.unlock ();
-       }
 }
 
 void
@@ -576,9 +599,11 @@ Session::when_engine_running ()
        set_block_size (_engine.frames_per_cycle());
        set_frame_rate (_engine.frame_rate());
 
+       Config->map_parameters (mem_fun (*this, &Session::config_changed));
+
        /* every time we reconnect, recompute worst case output latencies */
 
-       _engine.Running.connect (sigc::bind (mem_fun (*this, &Session::set_worst_io_latencies), true));
+       _engine.Running.connect (mem_fun (*this, &Session::set_worst_io_latencies));
 
        if (synced_to_jack()) {
                _engine.transport_stop ();
@@ -593,7 +618,7 @@ Session::when_engine_running ()
        try {
                XMLNode* child = 0;
                
-               _click_io = new ClickIO (*this, "click", 0, 0, -1, -1);
+               _click_io.reset (new ClickIO (*this, "click", 0, 0, -1, -1));
 
                if (state_tree && (child = find_named_node (*state_tree->root(), "Click")) != 0) {
 
@@ -601,7 +626,7 @@ Session::when_engine_running ()
                        
                        if (_click_io->set_state (*child->children().front()) == 0) {
                                
-                               _clicking = click_requested;
+                               _clicking = Config->get_clicking ();
 
                        } else {
 
@@ -619,7 +644,7 @@ Session::when_engine_running ()
                                if (_click_io->add_output_port (first_physical_output, this)) {
                                        // relax, even though its an error
                                } else {
-                                       _clicking = click_requested;
+                                       _clicking = Config->get_clicking ();
                                }
                        }
                }
@@ -629,10 +654,10 @@ Session::when_engine_running ()
                error << _("cannot setup Click I/O") << endmsg;
        }
 
-       set_worst_io_latencies (true);
+       set_worst_io_latencies ();
 
        if (_clicking) {
-                ControlChanged (Clicking); /* EMIT SIGNAL */
+               // XXX HOW TO ALERT UI TO THIS ? DO WE NEED TO?
        }
 
        if (auditioner == 0) {
@@ -644,7 +669,7 @@ Session::when_engine_running ()
                */
 
                try {
-                       auditioner = new Auditioner (*this);
+                       auditioner.reset (new Auditioner (*this));
                }
 
                catch (failed_constructor& err) {
@@ -767,7 +792,7 @@ Session::when_engine_running ()
 
        insert_cnt = 0;
        
-       for (slist<PortInsert*>::iterator i = _port_inserts.begin(); i != _port_inserts.end(); ++i) {
+       for (list<PortInsert*>::iterator i = _port_inserts.begin(); i != _port_inserts.end(); ++i) {
                uint32_t id;
 
                if (sscanf ((*i)->name().c_str(), "%*s %u", &id) == 1) {
@@ -779,7 +804,7 @@ Session::when_engine_running ()
 
        send_cnt = 0;
 
-       for (slist<Send*>::iterator i = _sends.begin(); i != _sends.end(); ++i) {
+       for (list<Send*>::iterator i = _sends.begin(); i != _sends.end(); ++i) {
                uint32_t id;
                
                if (sscanf ((*i)->name().c_str(), "%*s %u", &id) == 1) {
@@ -795,6 +820,12 @@ Session::when_engine_running ()
 
        _engine.set_session (this);
 
+#ifdef HAVE_LIBLO
+       /* and to OSC */
+
+       osc->set_session (*this);
+#endif
+    
        _state_of_the_state = Clean;
 
        DirtyChanged (); /* EMIT SIGNAL */
@@ -872,7 +903,7 @@ Session::playlist_length_changed (Playlist* pl)
 }
 
 void
-Session::diskstream_playlist_changed (DiskStream* dstream)
+Session::diskstream_playlist_changed (boost::shared_ptr<Diskstream> dstream)
 {
        Playlist *playlist;
 
@@ -892,132 +923,43 @@ Session::record_enabling_legal () const
        //      return false;
        // }
 
-       if (all_safe) {
+       if (Config->get_all_safe()) {
                return false;
        }
        return true;
 }
 
-void
-Session::set_auto_play (bool yn)
-{
-       if (auto_play != yn) {
-               auto_play = yn; 
-               set_dirty ();
-               ControlChanged (AutoPlay);
-       }
-}
-
-void
-Session::set_auto_return (bool yn)
-{
-       if (auto_return != yn) {
-               auto_return = yn; 
-               set_dirty ();
-               ControlChanged (AutoReturn);
-       }
-}
-
-void
-Session::set_crossfades_active (bool yn)
-{
-       if (crossfades_active != yn) {
-               crossfades_active = yn; 
-               set_dirty ();
-               ControlChanged (CrossFadesActive);
-       }
-}
-
-void
-Session::set_do_not_record_plugins (bool yn)
-{
-       if (do_not_record_plugins != yn) {
-               do_not_record_plugins = yn; 
-               set_dirty ();
-               ControlChanged (RecordingPlugins); 
-       }
-}
-
-void
-Session::set_auto_input (bool yn)
-{
-       if (auto_input != yn) {
-               auto_input = yn;
-               
-               if (Config->get_use_hardware_monitoring() && transport_rolling()) {
-                       /* auto-input only makes a difference if we're rolling */
-
-                       /* Even though this can called from RT context we are using
-                          a non-tentative rwlock here,  because the action must occur.
-                          The rarity and short potential lock duration makes this "OK"
-                       */
-                       RWLockMonitor dsm (diskstream_lock, false, __LINE__, __FILE__);
-                       for (DiskStreamList::iterator i = diskstreams.begin(); i != diskstreams.end(); ++i) {
-                               if ((*i)->record_enabled ()) {
-                                       //cerr << "switching to input = " << !auto_input << __FILE__ << __LINE__ << endl << endl;
-                                       (*i)->monitor_input (!auto_input);   
-                               }
-                       }
-               }
-
-               set_dirty();
-               ControlChanged (AutoInput);
-       }
-}
-
 void
 Session::reset_input_monitor_state ()
 {
        if (transport_rolling()) {
-               RWLockMonitor dsm (diskstream_lock, false, __LINE__, __FILE__);
-               for (DiskStreamList::iterator i = diskstreams.begin(); i != diskstreams.end(); ++i) {
+
+               boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
+
+               for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
                        if ((*i)->record_enabled ()) {
                                //cerr << "switching to input = " << !auto_input << __FILE__ << __LINE__ << endl << endl;
-                               (*i)->monitor_input (Config->get_use_hardware_monitoring() && !auto_input);
+                               (*i)->monitor_input (Config->get_use_hardware_monitoring() && !Config->get_auto_input());
                        }
                }
        } else {
-               RWLockMonitor dsm (diskstream_lock, false, __LINE__, __FILE__);
-               for (DiskStreamList::iterator i = diskstreams.begin(); i != diskstreams.end(); ++i) {
+               boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
+
+               for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
                        if ((*i)->record_enabled ()) {
-                               //cerr << "switching to input = " << !auto_input << __FILE__ << __LINE__ << endl << endl;
+                               //cerr << "switching to input = " << !Config->get_auto_input() << __FILE__ << __LINE__ << endl << endl;
                                (*i)->monitor_input (Config->get_use_hardware_monitoring());
                        }
                }
        }
 }
 
-
-void
-Session::set_input_auto_connect (bool yn)
-{
-       if (yn) {
-               input_auto_connect = AutoConnectOption (input_auto_connect|AutoConnectPhysical);
-       } else {
-               input_auto_connect = AutoConnectOption (input_auto_connect|~AutoConnectPhysical);
-       }
-       set_dirty ();
-}
-
-bool
-Session::get_input_auto_connect () const
-{
-       return (input_auto_connect & AutoConnectPhysical);
-}
-
-void
-Session::set_output_auto_connect (AutoConnectOption aco)
-{
-       output_auto_connect = aco;
-       set_dirty ();
-}
-
 void
 Session::auto_punch_start_changed (Location* location)
 {
        replace_event (Event::PunchIn, location->start());
 
-       if (get_record_enabled() && get_punch_in()) {
+       if (get_record_enabled() && Config->get_punch_in()) {
                /* capture start has been changed, so save new pending state */
                save_state ("", true);
        }
@@ -1026,7 +968,7 @@ Session::auto_punch_start_changed (Location* location)
 void
 Session::auto_punch_end_changed (Location* location)
 {
-       jack_nframes_t when_to_stop = location->end();
+       nframes_t when_to_stop = location->end();
        // when_to_stop += _worst_output_latency + _worst_input_latency;
        replace_event (Event::PunchOut, when_to_stop);
 }      
@@ -1034,7 +976,7 @@ Session::auto_punch_end_changed (Location* location)
 void
 Session::auto_punch_changed (Location* location)
 {
-       jack_nframes_t when_to_stop = location->end();
+       nframes_t when_to_stop = location->end();
 
        replace_event (Event::PunchIn, location->start());
        //when_to_stop += _worst_output_latency + _worst_input_latency;
@@ -1046,7 +988,7 @@ Session::auto_loop_changed (Location* location)
 {
        replace_event (Event::AutoLoop, location->end(), location->start());
 
-       if (transport_rolling() && get_auto_loop()) {
+       if (transport_rolling() && play_loop) {
 
                //if (_transport_frame < location->start() || _transport_frame > location->end()) {
 
@@ -1057,7 +999,7 @@ Session::auto_loop_changed (Location* location)
                        request_locate (location->start(), true);
 
                }
-               else if (seamless_loop && !loop_changing) {
+               else if (Config->get_seamless_loop() && !loop_changing) {
                        
                        // schedule a locate-roll to refill the diskstreams at the
                        // previous loop end
@@ -1114,48 +1056,6 @@ Session::set_auto_punch_location (Location* location)
        auto_punch_location_changed (location);
 }
 
-void
-Session::set_punch_in (bool yn)
-{
-       if (punch_in == yn) {
-               return;
-       }
-
-       Location* location;
-
-       if ((location = _locations.auto_punch_location()) != 0) {
-               if ((punch_in = yn) == true) {
-                       replace_event (Event::PunchIn, location->start());
-               } else {
-                       remove_event (location->start(), Event::PunchIn);
-               }
-       }
-
-       set_dirty();
-       ControlChanged (PunchIn); /* EMIT SIGNAL */
-}
-
-void
-Session::set_punch_out (bool yn)
-{
-       if (punch_out == yn) {
-               return;
-       }
-
-       Location* location;
-
-       if ((location = _locations.auto_punch_location()) != 0) {
-               if ((punch_out = yn) == true) {
-                       replace_event (Event::PunchOut, location->end());
-               } else {
-                       clear_events (Event::PunchOut);
-               }
-       }
-
-       set_dirty();
-       ControlChanged (PunchOut); /* EMIT SIGNAL */
-}
-
 void
 Session::set_auto_loop_location (Location* location)
 {
@@ -1244,19 +1144,14 @@ void
 Session::enable_record ()
 {
        /* XXX really atomic compare+swap here */
-       if (atomic_read (&_record_status) != Recording) {
-               atomic_set (&_record_status, Recording);
+       if (g_atomic_int_get (&_record_status) != Recording) {
+               g_atomic_int_set (&_record_status, Recording);
                _last_record_location = _transport_frame;
                send_mmc_in_another_thread (MIDI::MachineControl::cmdRecordStrobe);
 
-               if (Config->get_use_hardware_monitoring() && auto_input) {
-                       /* Even though this can be called from RT context we are using
-                          a non-tentative rwlock here,  because the action must occur.
-                          The rarity and short potential lock duration makes this "OK"
-                       */
-                       RWLockMonitor dsm (diskstream_lock, false, __LINE__, __FILE__);
-                       
-                       for (DiskStreamList::iterator i = diskstreams.begin(); i != diskstreams.end(); ++i) {
+               if (Config->get_use_hardware_monitoring() && Config->get_auto_input()) {
+                       boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
+                       for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
                                if ((*i)->record_enabled ()) {
                                        (*i)->monitor_input (true);   
                                }
@@ -1268,30 +1163,26 @@ Session::enable_record ()
 }
 
 void
-Session::disable_record (bool force)
+Session::disable_record (bool rt_context, bool force)
 {
        RecordState rs;
 
-       if ((rs = (RecordState) atomic_read (&_record_status)) != Disabled) {
+       if ((rs = (RecordState) g_atomic_int_get (&_record_status)) != Disabled) {
 
                if (!Config->get_latched_record_enable () || force) {
-                       atomic_set (&_record_status, Disabled);
+                       g_atomic_int_set (&_record_status, Disabled);
                } else {
                        if (rs == Recording) {
-                               atomic_set (&_record_status, Enabled);
+                               g_atomic_int_set (&_record_status, Enabled);
                        }
                }
 
                send_mmc_in_another_thread (MIDI::MachineControl::cmdRecordExit);
 
-               if (Config->get_use_hardware_monitoring() && auto_input) {
-                       /* Even though this can be called from RT context we are using
-                          a non-tentative rwlock here,  because the action must occur.
-                          The rarity and short potential lock duration makes this "OK"
-                       */
-                       RWLockMonitor dsm (diskstream_lock, false, __LINE__, __FILE__);
+               if (Config->get_use_hardware_monitoring() && Config->get_auto_input()) {
+                       boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
                        
-                       for (DiskStreamList::iterator i = diskstreams.begin(); i != diskstreams.end(); ++i) {
+                       for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
                                if ((*i)->record_enabled ()) {
                                        (*i)->monitor_input (false);   
                                }
@@ -1299,24 +1190,23 @@ Session::disable_record (bool force)
                }
                
                RecordStateChanged (); /* emit signal */
-               remove_pending_capture_state ();
+
+               if (!rt_context) {
+                       remove_pending_capture_state ();
+               }
        }
 }
 
 void
 Session::step_back_from_record ()
 {
-       atomic_set (&_record_status, Enabled);
+       g_atomic_int_set (&_record_status, Enabled);
 
        if (Config->get_use_hardware_monitoring()) {
-               /* Even though this can be called from RT context we are using
-                  a non-tentative rwlock here,  because the action must occur.
-                  The rarity and short potential lock duration makes this "OK"
-               */
-               RWLockMonitor dsm (diskstream_lock, false, __LINE__, __FILE__);
+               boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
                
-               for (DiskStreamList::iterator i = diskstreams.begin(); i != diskstreams.end(); ++i) {
-                       if (auto_input && (*i)->record_enabled ()) {
+               for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
+                       if (Config->get_auto_input() && (*i)->record_enabled ()) {
                                //cerr << "switching from input" << __FILE__ << __LINE__ << endl << endl;
                                (*i)->monitor_input (false);   
                        }
@@ -1327,7 +1217,7 @@ Session::step_back_from_record ()
 void
 Session::maybe_enable_record ()
 {
-       atomic_set (&_record_status, Enabled);
+       g_atomic_int_set (&_record_status, Enabled);
 
        /* XXX this save should really happen in another thread. its needed so that
           pending capture state can be recovered if we crash.
@@ -1336,7 +1226,7 @@ Session::maybe_enable_record ()
        save_state ("", true);
 
        if (_transport_speed) {
-               if (!punch_in) {
+               if (!Config->get_punch_in()) {
                        enable_record ();
                } 
        } else {
@@ -1347,12 +1237,12 @@ Session::maybe_enable_record ()
        set_dirty();
 }
 
-jack_nframes_t
+nframes_t
 Session::audible_frame () const
 {
-       jack_nframes_t ret;
-       jack_nframes_t offset;
-       jack_nframes_t tf;
+       nframes_t ret;
+       nframes_t offset;
+       nframes_t tf;
 
        /* the first of these two possible settings for "offset"
           mean that the audible frame is stationary until 
@@ -1406,19 +1296,23 @@ Session::audible_frame () const
 }
 
 void
-Session::set_frame_rate (jack_nframes_t frames_per_second)
+Session::set_frame_rate (nframes_t frames_per_second)
 {
-       /** \fn void Session::set_frame_size(jack_nframes_t)
+       /** \fn void Session::set_frame_size(nframes_t)
                the AudioEngine object that calls this guarantees 
                that it will not be called while we are also in
                ::process(). Its fine to do things that block
                here.
        */
 
-       _current_frame_rate = frames_per_second;
-       _frames_per_smpte_frame = (double) _current_frame_rate / (double) smpte_frames_per_second;
+       _base_frame_rate = frames_per_second;
 
-       Route::set_automation_interval ((jack_nframes_t) ceil ((double) frames_per_second * 0.25));
+       sync_time_vars();
+
+       Route::set_automation_interval ((nframes_t) ceil ((double) frames_per_second * 0.25));
+
+       // XXX we need some equivalent to this, somehow
+       // DestructiveFileSource::setup_standard_crossfades (frames_per_second);
 
        set_dirty();
 
@@ -1426,7 +1320,7 @@ Session::set_frame_rate (jack_nframes_t frames_per_second)
 }
 
 void
-Session::set_block_size (jack_nframes_t nframes)
+Session::set_block_size (nframes_t nframes)
 {
        /* the AudioEngine guarantees 
           that it will not be called while we are also in
@@ -1435,8 +1329,6 @@ Session::set_block_size (jack_nframes_t nframes)
        */
 
        { 
-               RWLockMonitor lm (route_lock, false, __LINE__, __FILE__);
-               RWLockMonitor dsm (diskstream_lock, false, __LINE__, __FILE__);
                vector<Sample*>::iterator i;
                uint32_t np;
                        
@@ -1477,15 +1369,18 @@ Session::set_block_size (jack_nframes_t nframes)
 
                allocate_pan_automation_buffers (nframes, _npan_buffers, true);
 
-               for (RouteList::iterator i = routes.begin(); i != routes.end(); ++i) {
+               boost::shared_ptr<RouteList> r = routes.reader ();
+
+               for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
                        (*i)->set_block_size (nframes);
                }
                
-               for (DiskStreamList::iterator i = diskstreams.begin(); i != diskstreams.end(); ++i) {
+               boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
+               for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
                        (*i)->set_block_size (nframes);
                }
 
-               set_worst_io_latencies (false);
+               set_worst_io_latencies ();
        }
 }
 
@@ -1493,7 +1388,7 @@ void
 Session::set_default_fade (float steepness, float fade_msecs)
 {
 #if 0
-       jack_nframes_t fade_frames;
+       nframes_t fade_frames;
        
        /* Don't allow fade of less 1 frame */
        
@@ -1504,7 +1399,7 @@ Session::set_default_fade (float steepness, float fade_msecs)
 
        } else {
                
-               fade_frames = (jack_nframes_t) floor (fade_msecs * _current_frame_rate * 0.001);
+               fade_frames = (nframes_t) floor (fade_msecs * _current_frame_rate * 0.001);
                
        }
 
@@ -1513,7 +1408,7 @@ Session::set_default_fade (float steepness, float fade_msecs)
 
        {
                // jlc, WTF is this!
-               RWLockMonitor lm (route_lock, false, __LINE__, __FILE__);
+               Glib::RWLock::ReaderLock lm (route_lock);
                AudioRegion::set_default_fade (steepness, fade_frames);
        }
 
@@ -1527,7 +1422,7 @@ Session::set_default_fade (float steepness, float fade_msecs)
 }
 
 struct RouteSorter {
-    bool operator() (Route* r1, Route* r2) {
+    bool operator() (boost::shared_ptr<Route> r1, boost::shared_ptr<Route> r2) {
            if (r1->fed_by.find (r2) != r1->fed_by.end()) {
                    return false;
            } else if (r2->fed_by.find (r1) != r2->fed_by.end()) {
@@ -1549,9 +1444,9 @@ struct RouteSorter {
 };
 
 static void
-trace_terminal (Route* r1, Route* rbase)
+trace_terminal (shared_ptr<Route> r1, shared_ptr<Route> rbase)
 {
-       Route* r2;
+       shared_ptr<Route> r2;
 
        if ((r1->fed_by.find (rbase) != r1->fed_by.end()) && (rbase->fed_by.find (r1) != rbase->fed_by.end())) {
                info << string_compose(_("feedback loop setup between %1 and %2"), r1->name(), rbase->name()) << endmsg;
@@ -1560,13 +1455,13 @@ trace_terminal (Route* r1, Route* rbase)
 
        /* make a copy of the existing list of routes that feed r1 */
 
-       set<Route *> existing = r1->fed_by;
+       set<shared_ptr<Route> > existing = r1->fed_by;
 
        /* for each route that feeds r1, recurse, marking it as feeding
           rbase as well.
        */
 
-       for (set<Route *>::iterator i = existing.begin(); i != existing.end(); ++i) {
+       for (set<shared_ptr<Route> >::iterator i = existing.begin(); i != existing.end(); ++i) {
                r2 =* i;
 
                /* r2 is a route that feeds r1 which somehow feeds base. mark
@@ -1596,7 +1491,7 @@ trace_terminal (Route* r1, Route* rbase)
 }
 
 void
-Session::resort_routes (void* src)
+Session::resort_routes ()
 {
        /* don't do anything here with signals emitted
           by Routes while we are being destroyed.
@@ -1606,67 +1501,79 @@ Session::resort_routes (void* src)
                return;
        }
 
-       /* Caller MUST hold the route_lock */
 
-       RouteList::iterator i, j;
+       {
 
-       for (i = routes.begin(); i != routes.end(); ++i) {
+               RCUWriter<RouteList> writer (routes);
+               shared_ptr<RouteList> r = writer.get_copy ();
+               resort_routes_using (r);
+               /* writer goes out of scope and forces update */
+       }
 
+}
+void
+Session::resort_routes_using (shared_ptr<RouteList> r)
+{
+       RouteList::iterator i, j;
+       
+       for (i = r->begin(); i != r->end(); ++i) {
+               
                (*i)->fed_by.clear ();
                
-               for (j = routes.begin(); j != routes.end(); ++j) {
-
+               for (j = r->begin(); j != r->end(); ++j) {
+                       
                        /* although routes can feed themselves, it will
                           cause an endless recursive descent if we
                           detect it. so don't bother checking for
                           self-feeding.
                        */
-
+                       
                        if (*j == *i) {
                                continue;
                        }
-
+                       
                        if ((*j)->feeds (*i)) {
                                (*i)->fed_by.insert (*j);
                        } 
                }
        }
        
-       for (i = routes.begin(); i != routes.end(); ++i) {
+       for (i = r->begin(); i != r->end(); ++i) {
                trace_terminal (*i, *i);
        }
-
+       
        RouteSorter cmp;
-       routes.sort (cmp);
-
+       r->sort (cmp);
+       
 #if 0
        cerr << "finished route resort\n";
        
-       for (i = routes.begin(); i != routes.end(); ++i) {
+       for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
                cerr << " " << (*i)->name() << " signal order = " << (*i)->order_key ("signal") << endl;
        }
        cerr << endl;
 #endif
-
+       
 }
 
-AudioTrack*
-Session::new_audio_track (int input_channels, int output_channels, TrackMode mode)
+list<boost::shared_ptr<AudioTrack> >
+Session::new_audio_track (int input_channels, int output_channels, TrackMode mode, uint32_t how_many)
 {
-       AudioTrack *track;
        char track_name[32];
+       uint32_t track_id = 0;
        uint32_t n = 0;
        uint32_t channels_used = 0;
        string port;
-       uint32_t nphysical_in;
-       uint32_t nphysical_out;
+       RouteList new_routes;
+       list<boost::shared_ptr<AudioTrack> > ret;
 
        /* count existing audio tracks */
 
        {
-               RWLockMonitor lm (route_lock, false, __LINE__, __FILE__);
-               for (RouteList::iterator i = routes.begin(); i != routes.end(); ++i) {
-                       if (dynamic_cast<AudioTrack*>(*i) != 0) {
+               shared_ptr<RouteList> r = routes.reader ();
+
+               for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
+                       if (dynamic_cast<AudioTrack*>((*i).get()) != 0) {
                                if (!(*i)->hidden()) {
                                        n++;
                                        channels_used += (*i)->n_inputs();
@@ -1675,240 +1582,284 @@ Session::new_audio_track (int input_channels, int output_channels, TrackMode mod
                }
        }
 
-       /* check for duplicate route names, since we might have pre-existing
-          routes with this name (e.g. create Audio1, Audio2, delete Audio1,
-          save, close,restart,add new route - first named route is now
-          Audio2)
-       */
+       vector<string> physinputs;
+       vector<string> physoutputs;
+       uint32_t nphysical_in;
+       uint32_t nphysical_out;
 
-       do {
-               snprintf (track_name, sizeof(track_name), "Audio %" PRIu32, n+1);
-               if (route_by_name (track_name) == 0) {
-                       break;
-               }
-               n++;
+       _engine.get_physical_outputs (physoutputs);
+       _engine.get_physical_inputs (physinputs);
 
-       } while (n < (UINT_MAX-1));
+       while (how_many) {
 
-       if (input_auto_connect & AutoConnectPhysical) {
-               nphysical_in = n_physical_inputs;
-       } else {
-               nphysical_in = 0;
-       }
+               /* check for duplicate route names, since we might have pre-existing
+                  routes with this name (e.g. create Audio1, Audio2, delete Audio1,
+                  save, close,restart,add new route - first named route is now
+                  Audio2)
+               */
+               
 
-       if (output_auto_connect & AutoConnectPhysical) {
-               nphysical_out = n_physical_outputs;
-       } else {
-               nphysical_out = 0;
-       }
+               do {
+                       ++track_id;
 
-       try {
-               track = new AudioTrack (*this, track_name, Route::Flag (0), mode);
+                       snprintf (track_name, sizeof(track_name), "Audio %" PRIu32, track_id);
 
-               if (track->ensure_io (input_channels, output_channels, false, this)) {
-                       error << string_compose (_("cannot configure %1 in/%2 out configuration for new audio track"),
-                                         input_channels, output_channels)
-                             << endmsg;
-               }
+                       if (route_by_name (track_name) == 0) {
+                               break;
+                       }
+                       
+               } while (track_id < (UINT_MAX-1));
 
-               if (nphysical_in) {
-                       for (uint32_t x = 0; x < track->n_inputs() && x < nphysical_in; ++x) {
+               if (input_auto_connect & AutoConnectPhysical) {
+                       nphysical_in = min (n_physical_inputs, (uint32_t) physinputs.size());
+               } else {
+                       nphysical_in = 0;
+               }
+               
+               if (output_auto_connect & AutoConnectPhysical) {
+                       nphysical_out = min (n_physical_outputs, (uint32_t) physinputs.size());
+               } else {
+                       nphysical_out = 0;
+               }
+               
+               try {
+                       shared_ptr<AudioTrack> track (new AudioTrack (*this, track_name, Route::Flag (0), mode));
+                       
+                       if (track->ensure_io (input_channels, output_channels, false, this)) {
+                               error << string_compose (_("cannot configure %1 in/%2 out configuration for new audio track"),
+                                                        input_channels, output_channels)
+                                     << endmsg;
+                       }
+                       
+                       if (nphysical_in) {
+                               for (uint32_t x = 0; x < track->n_inputs() && x < nphysical_in; ++x) {
+                                       
+                                       port = "";
+                                       
+                                       if (input_auto_connect & AutoConnectPhysical) {
+                                               port = physinputs[(channels_used+x)%nphysical_in];
+                                       } 
+                                       
+                                       if (port.length() && track->connect_input (track->input (x), port, this)) {
+                                               break;
+                                       }
+                               }
+                       }
+                       
+                       for (uint32_t x = 0; x < track->n_outputs(); ++x) {
                                
                                port = "";
                                
-                               if (input_auto_connect & AutoConnectPhysical) {
-                                       port = _engine.get_nth_physical_input ((channels_used+x)%nphysical_in);
-                               } 
+                               if (nphysical_out && (output_auto_connect & AutoConnectPhysical)) {
+                                       port = physoutputs[(channels_used+x)%nphysical_out];
+                               } else if (output_auto_connect & AutoConnectMaster) {
+                                       if (_master_out) {
+                                               port = _master_out->input (x%_master_out->n_inputs())->name();
+                                       }
+                               }
                                
-                               if (port.length() && track->connect_input (track->input (x), port, this)) {
+                               if (port.length() && track->connect_output (track->output (x), port, this)) {
                                        break;
                                }
                        }
-               }
-               
-               for (uint32_t x = 0; x < track->n_outputs(); ++x) {
                        
-                       port = "";
+                       channels_used += track->n_inputs ();
 
-                       if (nphysical_out && (output_auto_connect & AutoConnectPhysical)) {
-                               port = _engine.get_nth_physical_output ((channels_used+x)%nphysical_out);
-                       } else if (output_auto_connect & AutoConnectMaster) {
-                               if (_master_out) {
-                                       port = _master_out->input (x%_master_out->n_inputs())->name();
+                       if (_control_out) {
+                               vector<string> cports;
+                               uint32_t ni = _control_out->n_inputs();
+                               
+                               for (n = 0; n < ni; ++n) {
+                                       cports.push_back (_control_out->input(n)->name());
                                }
+                               
+                               track->set_control_outs (cports);
                        }
+                       
+                       track->DiskstreamChanged.connect (mem_fun (this, &Session::resort_routes));
+                       track->set_remote_control_id (ntracks());
 
-                       if (port.length() && track->connect_output (track->output (x), port, this)) {
-                               break;
-                       }
+                       new_routes.push_back (track);
+                       ret.push_back (track);
                }
 
-               if (_control_out) {
-                       vector<string> cports;
-                       uint32_t ni = _control_out->n_inputs();
-
-                       for (n = 0; n < ni; ++n) {
-                               cports.push_back (_control_out->input(n)->name());
-                       }
-
-                       track->set_control_outs (cports);
+               catch (failed_constructor &err) {
+                       error << _("Session: could not create new audio track.") << endmsg;
+                       // XXX should we delete the tracks already created? 
+                       ret.clear ();
+                       return ret;
                }
-
-               track->diskstream_changed.connect (mem_fun (this, &Session::resort_routes));
-
-               add_route (track);
-
-               track->set_remote_control_id (ntracks());
+               
+               --how_many;
        }
 
-       catch (failed_constructor &err) {
-               error << _("Session: could not create new audio track.") << endmsg;
-               return 0;
+       if (!new_routes.empty()) {
+               add_routes (new_routes, false);
+               save_state (_current_snapshot_name);
        }
 
-       return track;
+       return ret;
 }
 
-Route*
-Session::new_audio_route (int input_channels, int output_channels)
+Session::RouteList
+Session::new_audio_route (int input_channels, int output_channels, uint32_t how_many)
 {
-       Route *bus;
        char bus_name[32];
+       uint32_t bus_id = 1;
        uint32_t n = 0;
        string port;
+       RouteList ret;
 
        /* count existing audio busses */
 
        {
-               RWLockMonitor lm (route_lock, false, __LINE__, __FILE__);
-               for (RouteList::iterator i = routes.begin(); i != routes.end(); ++i) {
-                       if (dynamic_cast<AudioTrack*>(*i) == 0) {
+               shared_ptr<RouteList> r = routes.reader ();
+
+               for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
+                       if (dynamic_cast<AudioTrack*>((*i).get()) == 0) {
                                if (!(*i)->hidden()) {
-                                       n++;
+                                       bus_id++;
                                }
                        }
                }
        }
 
-       do {
-               snprintf (bus_name, sizeof(bus_name), "Bus %" PRIu32, n+1);
-               if (route_by_name (bus_name) == 0) {
-                       break;
-               }
-               n++;
+       vector<string> physinputs;
+       vector<string> physoutputs;
 
-       } while (n < (UINT_MAX-1));
+       _engine.get_physical_outputs (physoutputs);
+       _engine.get_physical_inputs (physinputs);
 
-       try {
-               bus = new Route (*this, bus_name, -1, -1, -1, -1);
+       while (how_many) {
 
-               if (bus->ensure_io (input_channels, output_channels, false, this)) {
-                       error << string_compose (_("cannot configure %1 in/%2 out configuration for new audio track"),
-                                         input_channels, output_channels)
-                             << endmsg;
-               }
+               do {
+                       ++bus_id;
 
-               for (uint32_t x = 0; x < bus->n_inputs(); ++x) {
-                       
-                       port = "";
+                       snprintf (bus_name, sizeof(bus_name), "Bus %" PRIu32, bus_id);
 
-                       if (input_auto_connect & AutoConnectPhysical) {
-                               port = _engine.get_nth_physical_input ((n+x)%n_physical_inputs);
-                       } 
-                       
-                       if (port.length() && bus->connect_input (bus->input (x), port, this)) {
+                       if (route_by_name (bus_name) == 0) {
                                break;
                        }
-               }
 
-               for (uint32_t x = 0; x < bus->n_outputs(); ++x) {
-                       
-                       port = "";
+               } while (bus_id < (UINT_MAX-1));
 
-                       if (output_auto_connect & AutoConnectPhysical) {
-                               port = _engine.get_nth_physical_input ((n+x)%n_physical_outputs);
-                       } else if (output_auto_connect & AutoConnectMaster) {
-                               if (_master_out) {
-                                       port = _master_out->input (x%_master_out->n_inputs())->name();
+               try {
+                       shared_ptr<Route> bus (new Route (*this, bus_name, -1, -1, -1, -1, Route::Flag(0), DataType::AUDIO));
+                       
+                       if (bus->ensure_io (input_channels, output_channels, false, this)) {
+                               error << string_compose (_("cannot configure %1 in/%2 out configuration for new audio track"),
+                                                        input_channels, output_channels)
+                                     << endmsg;
+                       }
+                       
+                       for (uint32_t x = 0; x < bus->n_inputs(); ++x) {
+                               
+                               port = "";
+                               
+                               if (input_auto_connect & AutoConnectPhysical) {
+                                       port = physinputs[((n+x)%n_physical_inputs)];
+                               } 
+                               
+                               if (port.length() && bus->connect_input (bus->input (x), port, this)) {
+                                       break;
                                }
                        }
-
-                       if (port.length() && bus->connect_output (bus->output (x), port, this)) {
-                               break;
+                       
+                       for (uint32_t x = 0; x < bus->n_outputs(); ++x) {
+                               
+                               port = "";
+                               
+                               if (output_auto_connect & AutoConnectPhysical) {
+                                       port = physoutputs[((n+x)%n_physical_outputs)];
+                               } else if (output_auto_connect & AutoConnectMaster) {
+                                       if (_master_out) {
+                                               port = _master_out->input (x%_master_out->n_inputs())->name();
+                                       }
+                               }
+                               
+                               if (port.length() && bus->connect_output (bus->output (x), port, this)) {
+                                       break;
+                               }
+                       }
+                       
+                       if (_control_out) {
+                               vector<string> cports;
+                               uint32_t ni = _control_out->n_inputs();
+                               
+                               for (uint32_t n = 0; n < ni; ++n) {
+                                       cports.push_back (_control_out->input(n)->name());
+                               }
+                               bus->set_control_outs (cports);
                        }
-               }
 
-               if (_control_out) {
-                       vector<string> cports;
-                       uint32_t ni = _control_out->n_inputs();
+                       ret.push_back (bus);
+               }
+       
 
-                       for (uint32_t n = 0; n < ni; ++n) {
-                               cports.push_back (_control_out->input(n)->name());
-                       }
-                       bus->set_control_outs (cports);
+               catch (failed_constructor &err) {
+                       error << _("Session: could not create new audio route.") << endmsg;
+                       ret.clear ();
+                       return ret;
                }
-               
-               add_route (bus);
+
+               --how_many;
        }
 
-       catch (failed_constructor &err) {
-               error << _("Session: could not create new route.") << endmsg;
-               return 0;
+       if (!ret.empty()) {
+               add_routes (ret, false);
+               save_state (_current_snapshot_name);
        }
 
-       return bus;
+       return ret;
+
 }
 
 void
-Session::add_route (Route* route)
+Session::add_routes (RouteList& new_routes, bool save)
 {
        { 
-               RWLockMonitor lm (route_lock, true, __LINE__, __FILE__);
-               routes.push_front (route);
-               resort_routes(0);
+               RCUWriter<RouteList> writer (routes);
+               shared_ptr<RouteList> r = writer.get_copy ();
+               r->insert (r->end(), new_routes.begin(), new_routes.end());
+               resort_routes_using (r);
        }
 
-       route->solo_changed.connect (sigc::bind (mem_fun (*this, &Session::route_solo_changed), route));
-       route->mute_changed.connect (mem_fun (*this, &Session::route_mute_changed));
-       route->output_changed.connect (mem_fun (*this, &Session::set_worst_io_latencies_x));
-       route->redirects_changed.connect (mem_fun (*this, &Session::update_latency_compensation_proxy));
-
-       if (route->master()) {
-               _master_out = route;
+       for (RouteList::iterator x = new_routes.begin(); x != new_routes.end(); ++x) {
+               (*x)->solo_changed.connect (sigc::bind (mem_fun (*this, &Session::route_solo_changed), (*x)));
+               (*x)->mute_changed.connect (mem_fun (*this, &Session::route_mute_changed));
+               (*x)->output_changed.connect (mem_fun (*this, &Session::set_worst_io_latencies_x));
+               (*x)->redirects_changed.connect (mem_fun (*this, &Session::update_latency_compensation_proxy));
+               
+               if ((*x)->master()) {
+                       _master_out = (*x);
+               }
+               
+               if ((*x)->control()) {
+                       _control_out = (*x);
+               }
        }
 
-       if (route->control()) {
-               _control_out = route;
-       }
+       set_dirty();
 
-       AudioTrack* at = dynamic_cast<AudioTrack*>(route);
-       if (at && at->mode() == Destructive) {
-               destructive_index++;
+       if (save) {
+               save_state (_current_snapshot_name);
        }
 
-       set_dirty();
-       save_state (_current_snapshot_name);
-
-       RouteAdded (route); /* EMIT SIGNAL */
+       RouteAdded (new_routes); /* EMIT SIGNAL */
 }
 
 void
-Session::add_diskstream (DiskStream* dstream)
+Session::add_diskstream (boost::shared_ptr<Diskstream> dstream)
 {
        /* need to do this in case we're rolling at the time, to prevent false underruns */
-       dstream->do_refill(0, 0, 0);
+       dstream->do_refill_with_alloc();
        
        { 
-               RWLockMonitor lm (diskstream_lock, true, __LINE__, __FILE__);
-               diskstreams.push_back (dstream);
+               RCUWriter<DiskstreamList> writer (diskstreams);
+               boost::shared_ptr<DiskstreamList> ds = writer.get_copy();
+               ds->push_back (dstream);
        }
 
-       /* take a reference to the diskstream, preventing it from
-          ever being deleted until the session itself goes away,
-          or chooses to remove it for its own purposes.
-       */
-
-       dstream->ref();
        dstream->set_block_size (current_block_size);
 
        dstream->PlaylistChanged.connect (sigc::bind (mem_fun (*this, &Session::diskstream_playlist_changed), dstream));
@@ -1916,56 +1867,60 @@ Session::add_diskstream (DiskStream* dstream)
        diskstream_playlist_changed (dstream);
 
        dstream->prepare ();
-
-       set_dirty();
-       save_state (_current_snapshot_name);
-
-       DiskStreamAdded (dstream); /* EMIT SIGNAL */
 }
 
 void
-Session::remove_route (Route& route)
+Session::remove_route (shared_ptr<Route> route)
 {
        {       
-               RWLockMonitor lm (route_lock, true, __LINE__, __FILE__);
-               routes.remove (&route);
+               RCUWriter<RouteList> writer (routes);
+               shared_ptr<RouteList> rs = writer.get_copy ();
+               rs->remove (route);
                
                /* deleting the master out seems like a dumb
                   idea, but its more of a UI policy issue
                   than our concern.
                */
 
-               if (&route == _master_out) {
-                       _master_out = 0;
+               if (route == _master_out) {
+                       _master_out = shared_ptr<Route> ((Route*) 0);
                }
 
-               if (&route == _control_out) {
-                       _control_out = 0;
+               if (route == _control_out) {
+                       _control_out = shared_ptr<Route> ((Route*) 0);
 
                        /* cancel control outs for all routes */
 
                        vector<string> empty;
 
-                       for (RouteList::iterator r = routes.begin(); r != routes.end(); ++r) {
+                       for (RouteList::iterator r = rs->begin(); r != rs->end(); ++r) {
                                (*r)->set_control_outs (empty);
                        }
                }
 
                update_route_solo_state ();
+               
+               /* writer goes out of scope, forces route list update */
        }
 
-       {
-               RWLockMonitor lm (diskstream_lock, true, __LINE__, __FILE__);
-
-               AudioTrack* at;
+       // FIXME: audio specific
+       AudioTrack* at;
+       boost::shared_ptr<AudioDiskstream> ds;
+       
+       if ((at = dynamic_cast<AudioTrack*>(route.get())) != 0) {
+               ds = at->audio_diskstream();
+       }
+       
+       if (ds) {
 
-               if ((at = dynamic_cast<AudioTrack*>(&route)) != 0) {
-                       diskstreams.remove (&at->disk_stream());
-                       at->disk_stream().unref ();
+               {
+                       RCUWriter<DiskstreamList> dsl (diskstreams);
+                       boost::shared_ptr<DiskstreamList> d = dsl.get_copy();
+                       d->remove (ds);
                }
-
-               find_current_end ();
        }
+
+       find_current_end ();
        
        update_latency_compensation (false, false);
        set_dirty();
@@ -1974,7 +1929,9 @@ Session::remove_route (Route& route)
 
        save_state (_current_snapshot_name);
 
-       delete &route;
+       /* try to cause everyone to drop their references */
+
+       route->drop_references ();
 }      
 
 void
@@ -1984,19 +1941,20 @@ Session::route_mute_changed (void* src)
 }
 
 void
-Session::route_solo_changed (void* src, Route* route)
+Session::route_solo_changed (void* src, shared_ptr<Route> route)
 {      
        if (solo_update_disabled) {
                // We know already
                return;
        }
        
-       RWLockMonitor lm (route_lock, false, __LINE__, __FILE__);
        bool is_track;
        
-       is_track = (dynamic_cast<AudioTrack*>(route) != 0);
+       is_track = (dynamic_cast<AudioTrack*>(route.get()) != 0);
        
-       for (RouteList::iterator i = routes.begin(); i != routes.end(); ++i) {
+       shared_ptr<RouteList> r = routes.reader ();
+
+       for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
                
                /* soloing a track mutes all other tracks, soloing a bus mutes all other busses */
                
@@ -2004,7 +1962,7 @@ Session::route_solo_changed (void* src, Route* route)
                        
                        /* don't mess with busses */
                        
-                       if (dynamic_cast<AudioTrack*>(*i) == 0) {
+                       if (dynamic_cast<AudioTrack*>((*i).get()) == 0) {
                                continue;
                        }
                        
@@ -2012,7 +1970,7 @@ Session::route_solo_changed (void* src, Route* route)
                        
                        /* don't mess with tracks */
                        
-                       if (dynamic_cast<AudioTrack*>(*i) != 0) {
+                       if (dynamic_cast<AudioTrack*>((*i).get()) != 0) {
                                continue;
                        }
                }
@@ -2028,7 +1986,7 @@ Session::route_solo_changed (void* src, Route* route)
                                   then leave it as it is.
                                */
                                
-                               if (_solo_latched) {
+                               if (Config->get_solo_latched()) {
                                        continue;
                                } 
                        }
@@ -2045,10 +2003,10 @@ Session::route_solo_changed (void* src, Route* route)
        bool same_thing_soloed = false;
        bool signal = false;
 
-        for (RouteList::iterator i = routes.begin(); i != routes.end(); ++i) {
+        for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
                if ((*i)->soloed()) {
                        something_soloed = true;
-                       if (dynamic_cast<AudioTrack*>(*i)) {
+                       if (dynamic_cast<AudioTrack*>((*i).get())) {
                                if (is_track) {
                                        same_thing_soloed = true;
                                        break;
@@ -2077,16 +2035,6 @@ Session::route_solo_changed (void* src, Route* route)
        set_dirty();
 }
 
-void
-Session::set_solo_latched (bool yn)
-{
-       if (yn != _solo_latched) {
-               _solo_latched = yn;
-               set_dirty ();
-               ControlChanged (SoloLatch);
-       }
-}
-
 void
 Session::update_route_solo_state ()
 {
@@ -2099,11 +2047,13 @@ Session::update_route_solo_state ()
        /* this is where we actually implement solo by changing
           the solo mute setting of each track.
        */
-               
-        for (RouteList::iterator i = routes.begin(); i != routes.end(); ++i) {
+       
+       shared_ptr<RouteList> r = routes.reader ();
+
+        for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
                if ((*i)->soloed()) {
                        mute = true;
-                       if (dynamic_cast<AudioTrack*>(*i)) {
+                       if (dynamic_cast<AudioTrack*>((*i).get())) {
                                is_track = true;
                        }
                        break;
@@ -2119,7 +2069,7 @@ Session::update_route_solo_state ()
 
                /* nothing is soloed */
 
-               for (RouteList::iterator i = routes.begin(); i != routes.end(); ++i) {
+               for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
                        (*i)->set_solo_mute (false);
                }
                
@@ -2140,13 +2090,15 @@ Session::update_route_solo_state ()
 void
 Session::modify_solo_mute (bool is_track, bool mute)
 {
-        for (RouteList::iterator i = routes.begin(); i != routes.end(); ++i) {
+       shared_ptr<RouteList> r = routes.reader ();
+
+        for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
                
                if (is_track) {
                        
                        /* only alter track solo mute */
                        
-                       if (dynamic_cast<AudioTrack*>(*i)) {
+                       if (dynamic_cast<AudioTrack*>((*i).get())) {
                                if ((*i)->soloed()) {
                                        (*i)->set_solo_mute (!mute);
                                } else {
@@ -2158,7 +2110,7 @@ Session::modify_solo_mute (bool is_track, bool mute)
 
                        /* only alter bus solo mute */
 
-                       if (!dynamic_cast<AudioTrack*>(*i)) {
+                       if (!dynamic_cast<AudioTrack*>((*i).get())) {
 
                                if ((*i)->soloed()) {
 
@@ -2190,45 +2142,60 @@ Session::catch_up_on_solo ()
           basis, but needs the global overview that only the session
           has.
        */
-        RWLockMonitor lm (route_lock, false, __LINE__, __FILE__);
        update_route_solo_state();
 }      
                
-Route *
+shared_ptr<Route>
 Session::route_by_name (string name)
 {
-       RWLockMonitor lm (route_lock, false, __LINE__, __FILE__);
+       shared_ptr<RouteList> r = routes.reader ();
 
-       for (RouteList::iterator i = routes.begin(); i != routes.end(); ++i) {
+       for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
                if ((*i)->name() == name) {
-                       returni;
+                       return *i;
                }
        }
 
-       return 0;
+       return shared_ptr<Route> ((Route*) 0);
+}
+
+shared_ptr<Route>
+Session::route_by_id (PBD::ID id)
+{
+       shared_ptr<RouteList> r = routes.reader ();
+
+       for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
+               if ((*i)->id() == id) {
+                       return *i;
+               }
+       }
+
+       return shared_ptr<Route> ((Route*) 0);
+}
+
+shared_ptr<Route>
+Session::route_by_remote_id (uint32_t id)
+{
+       shared_ptr<RouteList> r = routes.reader ();
+
+       for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
+               if ((*i)->remote_control_id() == id) {
+                       return *i;
+               }
+       }
+
+       return shared_ptr<Route> ((Route*) 0);
 }
 
 void
 Session::find_current_end ()
 {
-       jack_nframes_t max = 0;
-       jack_nframes_t me; 
-
        if (_state_of_the_state & Loading) {
                return;
        }
 
-       /* Don't take the diskstream lock. Caller must have other ways to
-          ensure atomicity.
-       */
+       nframes_t max = get_maximum_extent ();
 
-       for (DiskStreamList::iterator i = diskstreams.begin(); i != diskstreams.end(); ++i) {
-               Playlist* pl = (*i)->playlist();
-               if ((me = pl->get_maximum_extent()) > max) {
-                       max = me;
-               }
-       }
-       
        if (max > end_location->end()) {
                end_location->set_end (max);
                set_dirty();
@@ -2236,32 +2203,50 @@ Session::find_current_end ()
        }
 }
 
-DiskStream *
+nframes_t
+Session::get_maximum_extent () const
+{
+       nframes_t max = 0;
+       nframes_t me; 
+
+       boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
+
+       for (DiskstreamList::const_iterator i = dsl->begin(); i != dsl->end(); ++i) {
+               Playlist* pl = (*i)->playlist();
+               if ((me = pl->get_maximum_extent()) > max) {
+                       max = me;
+               }
+       }
+
+       return max;
+}
+
+boost::shared_ptr<Diskstream>
 Session::diskstream_by_name (string name)
 {
-       RWLockMonitor lm (diskstream_lock, false, __LINE__, __FILE__);
+       boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
 
-       for (DiskStreamList::iterator i = diskstreams.begin(); i != diskstreams.end(); ++i) {
+       for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
                if ((*i)->name() == name) {
-                       returni;
+                       return *i;
                }
        }
 
-       return 0;
+       return boost::shared_ptr<Diskstream>((Diskstream*) 0);
 }
 
-DiskStream *
-Session::diskstream_by_id (id_t id)
+boost::shared_ptr<Diskstream>
+Session::diskstream_by_id (const PBD::ID& id)
 {
-       RWLockMonitor lm (diskstream_lock, false, __LINE__, __FILE__);
+       boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
 
-       for (DiskStreamList::iterator i = diskstreams.begin(); i != diskstreams.end(); ++i) {
+       for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
                if ((*i)->id() == id) {
                        return *i;
                }
        }
 
-       return 0;
+       return boost::shared_ptr<Diskstream>((Diskstream*) 0);
 }
 
 /* AudioRegion management */
@@ -2299,7 +2284,7 @@ Session::new_region_name (string old)
                sbuf = buf;
 
                for (i = audio_regions.begin(); i != audio_regions.end(); ++i) {
-                       if ((*i).second->name() == sbuf) {
+                       if (i->second->name() == sbuf) {
                                break;
                        }
                }
@@ -2325,7 +2310,7 @@ Session::region_name (string& result, string base, bool newlevel) const
 
        if (base == "") {
                
-               LockMonitor lm (region_lock, __LINE__, __FILE__);
+               Glib::Mutex::Lock lm (region_lock);
 
                snprintf (buf, sizeof (buf), "%d", (int)audio_regions.size() + 1);
 
@@ -2342,19 +2327,18 @@ Session::region_name (string& result, string base, bool newlevel) const
                } else {
                        string::size_type pos;
 
-                       if ((pos = base.find_last_of ('-')) == string::npos) {
-                               pos = base.find_last_of ('.');
-                       }
+                       pos = base.find_last_of ('.');
 
                        /* pos may be npos, but then we just use entire base */
 
                        subbase = base.substr (0, pos);
+
                }
-               
+
                bool name_taken = true;
                
                {
-                       LockMonitor lm (region_lock, __LINE__, __FILE__);
+                       Glib::Mutex::Lock lm (region_lock);
                        
                        for (int n = 1; n < 5000; ++n) {
                                
@@ -2365,7 +2349,7 @@ Session::region_name (string& result, string base, bool newlevel) const
                                name_taken = false;
                                
                                for (AudioRegionList::const_iterator i = audio_regions.begin(); i != audio_regions.end(); ++i) {
-                                       if ((*i).second->name() == result) {
+                                       if (i->second->name() == result) {
                                                name_taken = true;
                                                break;
                                        }
@@ -2382,41 +2366,41 @@ Session::region_name (string& result, string base, bool newlevel) const
                        /*NOTREACHED*/
                }
        }
-
        return 0;
 }      
 
 void
-Session::add_region (Region* region)
+Session::add_region (boost::shared_ptr<Region> region)
 {
-       AudioRegion* ar = 0;
-       AudioRegion* oar = 0;
+       boost::shared_ptr<AudioRegion> ar;
+       boost::shared_ptr<AudioRegion> oar;
        bool added = false;
 
        { 
-               LockMonitor lm (region_lock, __LINE__, __FILE__);
+               Glib::Mutex::Lock lm (region_lock);
 
-               if ((ar = dynamic_cast<AudioRegion*> (region)) != 0) {
+               if ((ar = boost::dynamic_pointer_cast<AudioRegion> (region)) != 0) {
 
                        AudioRegionList::iterator x;
 
                        for (x = audio_regions.begin(); x != audio_regions.end(); ++x) {
 
-                               oar = dynamic_cast<AudioRegion*> (x->second);
+                               oar = boost::dynamic_pointer_cast<AudioRegion> (x->second);
 
-                               if (ar->region_list_equivalent (*oar)) {
+                               if (ar->region_list_equivalent (oar)) {
                                        break;
                                }
                        }
 
                        if (x == audio_regions.end()) {
 
-                               pair<AudioRegionList::key_type, AudioRegionList::mapped_type> entry;
-       
+                               pair<AudioRegionList::key_type,AudioRegionList::mapped_type> entry;
+
                                entry.first = region->id();
                                entry.second = ar;
 
                                pair<AudioRegionList::iterator,bool> x = audio_regions.insert (entry);
+
                                
                                if (!x.second) {
                                        return;
@@ -2442,14 +2426,14 @@ Session::add_region (Region* region)
        set_dirty();
        
        if (added) {
-               region->GoingAway.connect (mem_fun (*this, &Session::remove_region));
+               region->GoingAway.connect (sigc::bind (mem_fun (*this, &Session::remove_region), region));
                region->StateChanged.connect (sigc::bind (mem_fun (*this, &Session::region_changed), region));
                AudioRegionAdded (ar); /* EMIT SIGNAL */
        }
 }
 
 void
-Session::region_changed (Change what_changed, Region* region)
+Session::region_changed (Change what_changed, boost::shared_ptr<Region> region)
 {
        if (what_changed & Region::HiddenChanged) {
                /* relay hidden changes */
@@ -2458,27 +2442,29 @@ Session::region_changed (Change what_changed, Region* region)
 }
 
 void
-Session::region_renamed (Region* region)
+Session::region_renamed (boost::shared_ptr<Region> region)
 {
        add_region (region);
 }
 
 void
-Session::remove_region (Region* region)
+Session::remove_region (boost::shared_ptr<Region> region)
 {
        AudioRegionList::iterator i;
-       AudioRegion* ar = 0;
+       boost::shared_ptr<AudioRegion> ar;
        bool removed = false;
-
+       
        { 
-               LockMonitor lm (region_lock, __LINE__, __FILE__);
+               Glib::Mutex::Lock lm (region_lock);
 
-               if ((ar = dynamic_cast<AudioRegion*> (region)) != 0) {
+               if ((ar = boost::dynamic_pointer_cast<AudioRegion> (region)) != 0) {
                        if ((i = audio_regions.find (region->id())) != audio_regions.end()) {
                                audio_regions.erase (i);
                                removed = true;
-                       } 
+                       }
+
                } else {
+
                        fatal << _("programming error: ") 
                              << X_("unknown region type passed to Session::remove_region()")
                              << endmsg;
@@ -2497,67 +2483,64 @@ Session::remove_region (Region* region)
        }
 }
 
-AudioRegion*
-Session::find_whole_file_parent (AudioRegion& child)
+boost::shared_ptr<AudioRegion>
+Session::find_whole_file_parent (boost::shared_ptr<AudioRegion> child)
 {
        AudioRegionList::iterator i;
-       AudioRegion* region;
-       LockMonitor lm (region_lock, __LINE__, __FILE__);
+       boost::shared_ptr<AudioRegion> region;
+       Glib::Mutex::Lock lm (region_lock);
 
        for (i = audio_regions.begin(); i != audio_regions.end(); ++i) {
 
-               region = (*i).second;
+               region = i->second;
 
                if (region->whole_file()) {
 
-                       if (child.source_equivalent (*region)) {
+                       if (child->source_equivalent (region)) {
                                return region;
                        }
                }
        } 
 
-       return 0;
+       return boost::shared_ptr<AudioRegion> ((AudioRegion*) 0);
 }      
 
 void
-Session::find_equivalent_playlist_regions (AudioRegion& region, vector<AudioRegion*>& result)
+Session::find_equivalent_playlist_regions (boost::shared_ptr<Region> region, vector<boost::shared_ptr<Region> >& result)
 {
-       for (PlaylistList::iterator i = playlists.begin(); i != playlists.end(); ++i) {
-
-               AudioPlaylist* pl;
-
-               if ((pl = dynamic_cast<AudioPlaylist*>(*i)) == 0) {
-                       continue;
-               }
-
-               pl->get_region_list_equivalent_regions (region, result);
-       }
+       for (PlaylistList::iterator i = playlists.begin(); i != playlists.end(); ++i)
+               (*i)->get_region_list_equivalent_regions (region, result);
 }
 
 int
-Session::destroy_region (Region* region)
+Session::destroy_region (boost::shared_ptr<Region> region)
 {
-       AudioRegion* aregion;
+       boost::shared_ptr<AudioRegion> aregion;
 
-       if ((aregion = dynamic_cast<AudioRegion*> (region)) == 0) {
+       if ((aregion = boost::dynamic_pointer_cast<AudioRegion> (region)) == 0) {
                return 0;
        }
-
+       
        if (aregion->playlist()) {
                aregion->playlist()->destroy_region (region);
        }
 
-       vector<Source*> srcs;
+       vector<boost::shared_ptr<Source> > srcs;
        
        for (uint32_t n = 0; n < aregion->n_channels(); ++n) {
-               srcs.push_back (&aregion->source (n));
+               srcs.push_back (aregion->source (n));
        }
 
-       for (vector<Source*>::iterator i = srcs.begin(); i != srcs.end(); ++i) {
+       for (vector<boost::shared_ptr<Source> >::iterator i = srcs.begin(); i != srcs.end(); ++i) {
                
-               if ((*i)->use_cnt() == 0) {
-                       (*i)->mark_for_remove ();
-                       delete *i;
+               if ((*i).use_count() == 1) {
+                       boost::shared_ptr<AudioFileSource> afs = boost::dynamic_pointer_cast<AudioFileSource>(*i);
+
+                       if (afs) {
+                               (afs)->mark_for_remove ();
+                       }
+                       
+                       (*i)->drop_references ();
                }
        }
 
@@ -2565,9 +2548,9 @@ Session::destroy_region (Region* region)
 }
 
 int
-Session::destroy_regions (list<Region*> regions)
+Session::destroy_regions (list<boost::shared_ptr<Region> > regions)
 {
-       for (list<Region*>::iterator i = regions.begin(); i != regions.end(); ++i) {
+       for (list<boost::shared_ptr<Region> >::iterator i = regions.begin(); i != regions.end(); ++i) {
                destroy_region (*i);
        }
        return 0;
@@ -2576,12 +2559,12 @@ Session::destroy_regions (list<Region*> regions)
 int
 Session::remove_last_capture ()
 {
-       list<Region*> r;
-
-       RWLockMonitor lm (diskstream_lock, false, __LINE__, __FILE__);
+       list<boost::shared_ptr<Region> > r;
        
-       for (DiskStreamList::iterator i = diskstreams.begin(); i != diskstreams.end(); ++i) {
-               list<Region*>& l = (*i)->last_capture_regions();
+       boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
+       
+       for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
+               list<boost::shared_ptr<Region> >& l = (*i)->last_capture_regions();
                
                if (!l.empty()) {
                        r.insert (r.end(), l.begin(), l.end());
@@ -2594,83 +2577,99 @@ Session::remove_last_capture ()
 }
 
 int
-Session::remove_region_from_region_list (Region& r)
+Session::remove_region_from_region_list (boost::shared_ptr<Region> r)
 {
-       remove_region (&r);
+       remove_region (r);
        return 0;
 }
 
 /* Source Management */
 
 void
-Session::add_source (Source* source)
+Session::add_source (boost::shared_ptr<Source> source)
 {
-       pair<SourceList::key_type, SourceList::mapped_type> entry;
+       boost::shared_ptr<AudioFileSource> afs;
+
+       if ((afs = boost::dynamic_pointer_cast<AudioFileSource>(source)) != 0) {
+
+               pair<AudioSourceList::key_type, AudioSourceList::mapped_type> entry;
+               pair<AudioSourceList::iterator,bool> result;
 
-       {
-               LockMonitor lm (source_lock, __LINE__, __FILE__);
                entry.first = source->id();
-               entry.second = source;
-               sources.insert (entry);
+               entry.second = afs;
+               
+               {
+                       Glib::Mutex::Lock lm (audio_source_lock);
+                       result = audio_sources.insert (entry);
+               }
+
+               if (!result.second) {
+                       cerr << "\tNOT inserted ? " << result.second << endl;
+               }
+
+               source->GoingAway.connect (sigc::bind (mem_fun (this, &Session::remove_source), boost::weak_ptr<Source> (source)));
+               set_dirty();
+               
+               SourceAdded (source); /* EMIT SIGNAL */
+       } else {
+               cerr << "\tNOT AUDIO FILE\n";
        }
-       
-       source->GoingAway.connect (mem_fun (this, &Session::remove_source));
-       set_dirty();
-       
-       SourceAdded (source); /* EMIT SIGNAL */
 }
 
 void
-Session::remove_source (Source* source)
+Session::remove_source (boost::weak_ptr<Source> src)
 {
-       SourceList::iterator i;
-
-       { 
-               LockMonitor lm (source_lock, __LINE__, __FILE__);
+       AudioSourceList::iterator i;
+       boost::shared_ptr<Source> source = src.lock();
 
-               if ((i = sources.find (source->id())) != sources.end()) {
-                       sources.erase (i);
+       if (!source) {
+               cerr << "removing a source DEAD\n";
+       } else {
+               cerr << "removing a source " << source->name () << endl;
+               
+               { 
+                       Glib::Mutex::Lock lm (audio_source_lock);
+                       
+                       if ((i = audio_sources.find (source->id())) != audio_sources.end()) {
+                               audio_sources.erase (i);
+                       } 
                }
-       }
-
-       if (!_state_of_the_state & InCleanup) {
-
-               /* save state so we don't end up with a session file
-                  referring to non-existent sources.
-               */
                
-               save_state (_current_snapshot_name);
+               if (!_state_of_the_state & InCleanup) {
+                       
+                       /* save state so we don't end up with a session file
+                          referring to non-existent sources.
+                       */
+                       
+                       save_state (_current_snapshot_name);
+               }
+               
+               SourceRemoved(source); /* EMIT SIGNAL */
        }
-
-       SourceRemoved(source); /* EMIT SIGNAL */
 }
 
-Source *
-Session::get_source (ARDOUR::id_t id)
+boost::shared_ptr<Source>
+Session::source_by_id (const PBD::ID& id)
 {
-       LockMonitor lm (source_lock, __LINE__, __FILE__);
-       SourceList::iterator i;
-       Source* source = 0;
+       Glib::Mutex::Lock lm (audio_source_lock);
+       AudioSourceList::iterator i;
+       boost::shared_ptr<Source> source;
 
-       if ((i = sources.find (id)) != sources.end()) {
-               source = (*i).second;
+       if ((i = audio_sources.find (id)) != audio_sources.end()) {
+               source = i->second;
        }
 
+       /* XXX search MIDI or other searches here */
+       
        return source;
 }
 
 string
-Session::peak_path_from_audio_path (string audio_path)
+Session::peak_path_from_audio_path (string audio_path) const
 {
-       /* XXX hardly bombproof! fix me */
-
        string res;
 
-       res = PBD::dirname (audio_path);
-       res = PBD::dirname (res);
-       res += '/';
-       res += peak_dir_name;
-       res += '/';
+       res = peak_dir ();
        res += PBD::basename_nosuffix (audio_path);
        res += ".peak";
 
@@ -2681,7 +2680,7 @@ string
 Session::change_audio_path_by_name (string path, string oldname, string newname, bool destructive)
 {
        string look_for;
-       string old_basename = basename_nosuffix (oldname);
+       string old_basename = PBD::basename_nosuffix (oldname);
        string new_legalized = legalize_for_path (newname);
 
        /* note: we know (or assume) the old path is already valid */
@@ -2731,12 +2730,13 @@ Session::change_audio_path_by_name (string path, string oldname, string newname,
                    the task here is to replace NAME with the new name.
                */
                
-               /* find last slash */
-
                string dir;
                string suffix;
                string::size_type slash;
                string::size_type dash;
+               string::size_type postfix;
+
+               /* find last slash */
 
                if ((slash = path.find_last_of ('/')) == string::npos) {
                        return "";
@@ -2750,11 +2750,41 @@ Session::change_audio_path_by_name (string path, string oldname, string newname,
                        return "";
                }
 
-               suffix = path.substr (dash);
+               suffix = path.substr (dash+1);
+               
+               // Suffix is now everything after the dash. Now we need to eliminate
+               // the nnnnn part, which is done by either finding a '%' or a '.'
+
+               postfix = suffix.find_last_of ("%");
+               if (postfix == string::npos) {
+                       postfix = suffix.find_last_of ('.');
+               }
+
+               if (postfix != string::npos) {
+                       suffix = suffix.substr (postfix);
+               } else {
+                       error << "Logic error in Session::change_audio_path_by_name(), please report to the developers" << endl;
+                       return "";
+               }
+
+               const uint32_t limit = 10000;
+               char buf[PATH_MAX+1];
+
+               for (uint32_t cnt = 1; cnt <= limit; ++cnt) {
+
+                       snprintf (buf, sizeof(buf), "%s%s-%u%s", dir.c_str(), newname.c_str(), cnt, suffix.c_str());
+
+                       if (access (buf, F_OK) != 0) {
+                               path = buf;
+                               break;
+                       }
+                       path = "";
+               }
+
+               if (path == "") {
+                       error << "FATAL ERROR! Could not find a " << endl;
+               }
 
-               path = dir;
-               path += new_legalized;
-               path += suffix;
        }
 
        return path;
@@ -2775,22 +2805,18 @@ Session::audio_path_from_name (string name, uint32_t nchan, uint32_t chan, bool
        /* find a "version" of the file name that doesn't exist in
           any of the possible directories.
        */
-       
-       for (cnt = (destructive ? destructive_index + 1 : 1); cnt <= limit; ++cnt) {
-               
+
+       for (cnt = (destructive ? ++destructive_index : 1); cnt <= limit; ++cnt) {
+
                vector<space_and_path>::iterator i;
                uint32_t existing = 0;
-               
+
                for (i = session_dirs.begin(); i != session_dirs.end(); ++i) {
-                       
+
                        spath = (*i).path;
-                       
-                       if (destructive) {
-                               spath += tape_dir_name;
-                       } else {
-                               spath += sound_dir_name;
-                       }
-                       
+
+                       spath += sound_dir (false);
+
                        if (destructive) {
                                if (nchan < 2) {
                                        snprintf (buf, sizeof(buf), "%s/T%04d-%s.wav", spath.c_str(), cnt, legalized.c_str());
@@ -2806,10 +2832,10 @@ Session::audio_path_from_name (string name, uint32_t nchan, uint32_t chan, bool
                                        snprintf (buf, sizeof(buf), "%s/T%04d-%s.wav", spath.c_str(), cnt, legalized.c_str());
                                }
                        } else {
-                               
+
                                spath += '/';
                                spath += legalized;
-                                       
+
                                if (nchan < 2) {
                                        snprintf (buf, sizeof(buf), "%s-%u.wav", spath.c_str(), cnt);
                                } else if (nchan == 2) {
@@ -2825,11 +2851,12 @@ Session::audio_path_from_name (string name, uint32_t nchan, uint32_t chan, bool
                                }
                        }
 
-                       if (access (buf, F_OK) == 0) {
+                       if (g_file_test (buf, G_FILE_TEST_EXISTS)) {
                                existing++;
-                       }
+                       } 
+
                }
-                       
+
                if (existing == 0) {
                        break;
                }
@@ -2846,11 +2873,7 @@ Session::audio_path_from_name (string name, uint32_t nchan, uint32_t chan, bool
 
        string foo = buf;
 
-       if (destructive) {
-               spath = tape_dir ();
-       } else {
-               spath = discover_best_sound_dir ();
-       }
+       spath = discover_best_sound_dir ();
 
        string::size_type pos = foo.find_last_of ('/');
        
@@ -2863,38 +2886,19 @@ Session::audio_path_from_name (string name, uint32_t nchan, uint32_t chan, bool
        return spath;
 }
 
-FileSource *
-Session::create_file_source (DiskStream& ds, int32_t chan, bool destructive)
+boost::shared_ptr<AudioFileSource>
+Session::create_audio_source_for_session (AudioDiskstream& ds, uint32_t chan, bool destructive)
 {
        string spath = audio_path_from_name (ds.name(), ds.n_channels(), chan, destructive);
-
-       /* this might throw failed_constructor(), which is OK */
-
-       if (destructive) {
-               return new DestructiveFileSource (spath, frame_rate(), false, Config->get_native_file_data_format());
-       } else {
-               return new FileSource (spath, frame_rate(), false, Config->get_native_file_data_format());
-       }
+       return boost::dynamic_pointer_cast<AudioFileSource> (SourceFactory::createWritable (*this, spath, destructive, frame_rate()));
 }
 
 /* Playlist management */
 
-Playlist *
-Session::get_playlist (string name)
-{
-       Playlist* ret = 0;
-
-       if ((ret = playlist_by_name (name)) == 0) {
-               ret = new AudioPlaylist (*this, name);
-       }
-
-       return ret;
-}
-
 Playlist *
 Session::playlist_by_name (string name)
 {
-       LockMonitor lm (playlist_lock, __LINE__, __FILE__);
+       Glib::Mutex::Lock lm (playlist_lock);
        for (PlaylistList::iterator i = playlists.begin(); i != playlists.end(); ++i) {
                if ((*i)->name() == name) {
                        return* i;
@@ -2916,12 +2920,12 @@ Session::add_playlist (Playlist* playlist)
        }
 
        { 
-               LockMonitor lm (playlist_lock, __LINE__, __FILE__);
+               Glib::Mutex::Lock lm (playlist_lock);
                if (find (playlists.begin(), playlists.end(), playlist) == playlists.end()) {
                        playlists.insert (playlists.begin(), playlist);
                        // playlist->ref();
                        playlist->InUse.connect (mem_fun (*this, &Session::track_playlist));
-                       playlist->GoingAway.connect (mem_fun (*this, &Session::remove_playlist));
+                       playlist->GoingAway.connect (sigc::bind (mem_fun (*this, &Session::remove_playlist), playlist));
                }
        }
 
@@ -2936,7 +2940,7 @@ Session::track_playlist (Playlist* pl, bool inuse)
        PlaylistList::iterator x;
 
        { 
-               LockMonitor lm (playlist_lock, __LINE__, __FILE__);
+               Glib::Mutex::Lock lm (playlist_lock);
 
                if (!inuse) {
                        //cerr << "shifting playlist to unused: " << pl->name() << endl;
@@ -2968,7 +2972,7 @@ Session::remove_playlist (Playlist* playlist)
        }
 
        { 
-               LockMonitor lm (playlist_lock, __LINE__, __FILE__);
+               Glib::Mutex::Lock lm (playlist_lock);
                // cerr << "removing playlist: " << playlist->name() << endl;
 
                PlaylistList::iterator i;
@@ -2992,7 +2996,7 @@ Session::remove_playlist (Playlist* playlist)
 }
 
 void 
-Session::set_audition (AudioRegion* r)
+Session::set_audition (boost::shared_ptr<Region> r)
 {
        pending_audition_region = r;
        post_transport_work = PostTransportWork (post_transport_work | PostTransportAudition);
@@ -3000,30 +3004,30 @@ Session::set_audition (AudioRegion* r)
 }
 
 void
-Session::non_realtime_set_audition ()
+Session::audition_playlist ()
 {
-       if (pending_audition_region == (AudioRegion*) 0xfeedface) {
-               auditioner->audition_current_playlist ();
-       } else if (pending_audition_region) {
-               auditioner->audition_region (*pending_audition_region);
-       }
-       pending_audition_region = 0;
-       AuditionActive (true); /* EMIT SIGNAL */
+       Event* ev = new Event (Event::Audition, Event::Add, Event::Immediate, 0, 0.0);
+       ev->region.reset ();
+       queue_event (ev);
 }
 
 void
-Session::audition_playlist ()
+Session::non_realtime_set_audition ()
 {
-       Event* ev = new Event (Event::Audition, Event::Add, Event::Immediate, 0, 0.0);
-       ev->set_ptr ((void*) 0xfeedface);
-       queue_event (ev);
+       if (!pending_audition_region) {
+               auditioner->audition_current_playlist ();
+       } else {
+               auditioner->audition_region (pending_audition_region);
+               pending_audition_region.reset ();
+       }
+       AuditionActive (true); /* EMIT SIGNAL */
 }
 
 void
-Session::audition_region (AudioRegion& r)
+Session::audition_region (boost::shared_ptr<Region> r)
 {
        Event* ev = new Event (Event::Audition, Event::Add, Event::Immediate, 0, 0.0);
-       ev->set_ptr (&r);
+       ev->region = r;
        queue_event (ev);
 }
 
@@ -3032,12 +3036,12 @@ Session::cancel_audition ()
 {
        if (auditioner->active()) {
                auditioner->cancel_audition ();
-                AuditionActive (false); /* EMIT SIGNAL */
+               AuditionActive (false); /* EMIT SIGNAL */
        }
 }
 
 bool
-Session::RoutePublicOrderSorter::operator() (Route* a, Route* b)
+Session::RoutePublicOrderSorter::operator() (boost::shared_ptr<Route> a, boost::shared_ptr<Route> b)
 {
        return a->order_key(N_("signal")) < b->order_key(N_("signal"));
 }
@@ -3045,17 +3049,35 @@ Session::RoutePublicOrderSorter::operator() (Route* a, Route* b)
 void
 Session::remove_empty_sounds ()
 {
-
        PathScanner scanner;
-       string dir;
-
-       dir = sound_dir ();
 
-       vector<string *>* possible_audiofiles = scanner (dir, "\\.wav$", false, true);
+       vector<string *>* possible_audiofiles = scanner (sound_dir(), "\\.(wav|aiff|caf|w64)$", false, true);
        
+       Glib::Mutex::Lock lm (audio_source_lock);
+       
+       regex_t compiled_tape_track_pattern;
+       int err;
+
+       if ((err = regcomp (&compiled_tape_track_pattern, "/T[0-9][0-9][0-9][0-9]-", REG_EXTENDED|REG_NOSUB))) {
+
+               char msg[256];
+               
+               regerror (err, &compiled_tape_track_pattern, msg, sizeof (msg));
+               
+               error << string_compose (_("Cannot compile tape track regexp for use (%1)"), msg) << endmsg;
+               return;
+       }
+
        for (vector<string *>::iterator i = possible_audiofiles->begin(); i != possible_audiofiles->end(); ++i) {
+               
+               /* never remove files that appear to be a tape track */
 
-               if (FileSource::is_empty (*(*i))) {
+               if (regexec (&compiled_tape_track_pattern, (*i)->c_str(), 0, 0, 0) == 0) {
+                       delete *i;
+                       continue;
+               }
+                       
+               if (AudioFileSource::is_empty (*this, *(*i))) {
 
                        unlink ((*i)->c_str());
                        
@@ -3083,13 +3105,11 @@ Session::is_auditioning () const
 void
 Session::set_all_solo (bool yn)
 {
-       {
-               RWLockMonitor lm (route_lock, false, __LINE__, __FILE__);
-               
-               for (RouteList::iterator i = routes.begin(); i != routes.end(); ++i) {
-                       if (!(*i)->hidden()) {
-                               (*i)->set_solo (yn, this);
-                       }
+       shared_ptr<RouteList> r = routes.reader ();
+       
+       for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
+               if (!(*i)->hidden()) {
+                       (*i)->set_solo (yn, this);
                }
        }
 
@@ -3099,13 +3119,11 @@ Session::set_all_solo (bool yn)
 void
 Session::set_all_mute (bool yn)
 {
-       {
-               RWLockMonitor lm (route_lock, false, __LINE__, __FILE__);
-               
-               for (RouteList::iterator i = routes.begin(); i != routes.end(); ++i) {
-                       if (!(*i)->hidden()) {
-                               (*i)->set_mute (yn, this);
-                       }
+       shared_ptr<RouteList> r = routes.reader ();
+       
+       for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
+               if (!(*i)->hidden()) {
+                       (*i)->set_mute (yn, this);
                }
        }
 
@@ -3115,10 +3133,11 @@ Session::set_all_mute (bool yn)
 uint32_t
 Session::n_diskstreams () const
 {
-       RWLockMonitor lm (diskstream_lock, false, __LINE__, __FILE__);
        uint32_t n = 0;
 
-       for (DiskStreamList::const_iterator i = diskstreams.begin(); i != diskstreams.end(); ++i) {
+       boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
+
+       for (DiskstreamList::const_iterator i = dsl->begin(); i != dsl->end(); ++i) {
                if (!(*i)->hidden()) {
                        n++;
                }
@@ -3126,17 +3145,6 @@ Session::n_diskstreams () const
        return n;
 }
 
-void 
-Session::foreach_diskstream (void (DiskStream::*func)(void)) 
-{
-       RWLockMonitor lm (diskstream_lock, false, __LINE__, __FILE__);
-       for (DiskStreamList::iterator i = diskstreams.begin(); i != diskstreams.end(); ++i) {
-               if (!(*i)->hidden()) {
-                       ((*i)->*func)();
-               }
-       }
-}
-
 void
 Session::graph_reordered ()
 {
@@ -3148,16 +3156,15 @@ Session::graph_reordered ()
                return;
        }
 
-       RWLockMonitor lm1 (route_lock, true, __LINE__, __FILE__);
-       RWLockMonitor lm2 (diskstream_lock, false, __LINE__, __FILE__);
-
-       resort_routes (0);
+       resort_routes ();
 
        /* force all diskstreams to update their capture offset values to 
           reflect any changes in latencies within the graph.
        */
        
-       for (DiskStreamList::iterator i = diskstreams.begin(); i != diskstreams.end(); ++i) {
+       boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
+
+       for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
                (*i)->set_capture_offset ();
        }
 }
@@ -3177,12 +3184,12 @@ Session::record_enable_all ()
 void
 Session::record_enable_change_all (bool yn)
 {
-       RWLockMonitor lm1 (route_lock, false, __LINE__, __FILE__);
+       shared_ptr<RouteList> r = routes.reader ();
        
-       for (RouteList::iterator i = routes.begin(); i != routes.end(); ++i) {
+       for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
                AudioTrack* at;
 
-               if ((at = dynamic_cast<AudioTrack*>(*i)) != 0) {
+               if ((at = dynamic_cast<AudioTrack*>((*i).get())) != 0) {
                        at->set_record_enable (yn, this);
                }
        }
@@ -3214,7 +3221,7 @@ Session::add_redirect (Redirect* redirect)
                /*NOTREACHED*/
        }
 
-       redirect->GoingAway.connect (mem_fun (*this, &Session::remove_redirect));
+       redirect->GoingAway.connect (sigc::bind (mem_fun (*this, &Session::remove_redirect), redirect));
 
        set_dirty();
 }
@@ -3246,23 +3253,23 @@ Session::remove_redirect (Redirect* redirect)
        set_dirty();
 }
 
-jack_nframes_t
+nframes_t
 Session::available_capture_duration ()
 {
        const double scale = 4096.0 / sizeof (Sample);
-       
+
        if (_total_free_4k_blocks * scale > (double) max_frames) {
                return max_frames;
        }
        
-       return (jack_nframes_t) floor (_total_free_4k_blocks * scale);
+       return (nframes_t) floor (_total_free_4k_blocks * scale);
 }
 
 void
 Session::add_connection (ARDOUR::Connection* connection)
 {
        {
-               LockMonitor (connection_lock, __LINE__, __FILE__);
+               Glib::Mutex::Lock guard (connection_lock);
                _connections.push_back (connection);
        }
        
@@ -3277,7 +3284,7 @@ Session::remove_connection (ARDOUR::Connection* connection)
        bool removed = false;
 
        {
-               LockMonitor (connection_lock, __LINE__, __FILE__);
+               Glib::Mutex::Lock guard (connection_lock);
                ConnectionList::iterator i = find (_connections.begin(), _connections.end(), connection);
                
                if (i != _connections.end()) {
@@ -3296,7 +3303,7 @@ Session::remove_connection (ARDOUR::Connection* connection)
 ARDOUR::Connection *
 Session::connection_by_name (string name) const
 {
-       LockMonitor lm (connection_lock, __LINE__, __FILE__);
+       Glib::Mutex::Lock lm (connection_lock);
 
        for (ConnectionList::const_iterator i = _connections.begin(); i != _connections.end(); ++i) {
                if ((*i)->name() == name) {
@@ -3307,23 +3314,6 @@ Session::connection_by_name (string name) const
        return 0;
 }
 
-void
-Session::set_edit_mode (EditMode mode)
-{
-       _edit_mode = mode;
-       
-       { 
-               LockMonitor lm (playlist_lock, __LINE__, __FILE__);
-               
-               for (PlaylistList::iterator i = playlists.begin(); i != playlists.end(); ++i) {
-                       (*i)->set_edit_mode (mode);
-               }
-       }
-
-       set_dirty ();
-       ControlChanged (EditingMode); /* EMIT SIGNAL */
-}
-
 void
 Session::tempo_map_changed (Change ignored)
 {
@@ -3388,7 +3378,7 @@ Session::next_insert_name ()
 NamedSelection *
 Session::named_selection_by_name (string name)
 {
-       LockMonitor lm (named_selection_lock, __LINE__, __FILE__);
+       Glib::Mutex::Lock lm (named_selection_lock);
        for (NamedSelectionList::iterator i = named_selections.begin(); i != named_selections.end(); ++i) {
                if ((*i)->name == name) {
                        return* i;
@@ -3401,7 +3391,7 @@ void
 Session::add_named_selection (NamedSelection* named_selection)
 {
        { 
-               LockMonitor lm (named_selection_lock, __LINE__, __FILE__);
+               Glib::Mutex::Lock lm (named_selection_lock);
                named_selections.insert (named_selections.begin(), named_selection);
        }
 
@@ -3416,7 +3406,7 @@ Session::remove_named_selection (NamedSelection* named_selection)
        bool removed = false;
 
        { 
-               LockMonitor lm (named_selection_lock, __LINE__, __FILE__);
+               Glib::Mutex::Lock lm (named_selection_lock);
 
                NamedSelectionList::iterator i = find (named_selections.begin(), named_selections.end(), named_selection);
 
@@ -3436,11 +3426,9 @@ Session::remove_named_selection (NamedSelection* named_selection)
 void
 Session::reset_native_file_format ()
 {
-       // jlc - WHY take routelock?
-       //RWLockMonitor lm1 (route_lock, true, __LINE__, __FILE__);
-       RWLockMonitor lm2 (diskstream_lock, false, __LINE__, __FILE__);
+       boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
 
-       for (DiskStreamList::iterator i = diskstreams.begin(); i != diskstreams.end(); ++i) {
+       for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
                (*i)->reset_write_sources (false);
        }
 }
@@ -3448,9 +3436,9 @@ Session::reset_native_file_format ()
 bool
 Session::route_name_unique (string n) const
 {
-       RWLockMonitor lm (route_lock, false, __LINE__, __FILE__);
+       shared_ptr<RouteList> r = routes.reader ();
        
-       for (RouteList::const_iterator i = routes.begin(); i != routes.end(); ++i) {
+       for (RouteList::const_iterator i = r->begin(); i != r->end(); ++i) {
                if ((*i)->name() == n) {
                        return false;
                }
@@ -3460,30 +3448,20 @@ Session::route_name_unique (string n) const
 }
 
 int
-Session::remove_file_source (FileSource& fs)
+Session::cleanup_audio_file_source (boost::shared_ptr<AudioFileSource> fs)
 {
-       return fs.move_to_trash (dead_sound_dir_name);
+       return fs->move_to_trash (dead_sound_dir_name);
 }
 
 uint32_t
 Session::n_playlists () const
 {
-       LockMonitor lm (playlist_lock, __LINE__, __FILE__);
+       Glib::Mutex::Lock lm (playlist_lock);
        return playlists.size();
 }
 
 void
-Session::set_solo_model (SoloModel sm)
-{
-       if (sm != _solo_model) {
-               _solo_model = sm;
-               ControlChanged (SoloingModel);
-               set_dirty ();
-       }
-}
-
-void
-Session::allocate_pan_automation_buffers (jack_nframes_t nframes, uint32_t howmany, bool force)
+Session::allocate_pan_automation_buffers (nframes_t nframes, uint32_t howmany, bool force)
 {
        if (!force && howmany <= _npan_buffers) {
                return;
@@ -3507,23 +3485,16 @@ Session::allocate_pan_automation_buffers (jack_nframes_t nframes, uint32_t howma
        _npan_buffers = howmany;
 }
 
-void 
-Session::add_instant_xml (XMLNode& node, const std::string& dir)
-{
-       Stateful::add_instant_xml (node, dir);
-       Config->add_instant_xml (node, get_user_ardour_path());
-}
-
 int
 Session::freeze (InterThreadInfo& itt)
 {
-       RWLockMonitor lm (route_lock, false, __LINE__, __FILE__);
+       shared_ptr<RouteList> r = routes.reader ();
 
-       for (RouteList::iterator i = routes.begin(); i != routes.end(); ++i) {
+       for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
 
                AudioTrack *at;
 
-               if ((at = dynamic_cast<AudioTrack*>(*i)) != 0) {
+               if ((at = dynamic_cast<AudioTrack*>((*i).get())) != 0) {
                        /* XXX this is wrong because itt.progress will keep returning to zero at the start
                           of every track.
                        */
@@ -3535,28 +3506,29 @@ Session::freeze (InterThreadInfo& itt)
 }
 
 int
-Session::write_one_track (AudioTrack& track, jack_nframes_t start, jack_nframes_t len,         bool overwrite, vector<Source*>& srcs,
-                         InterThreadInfo& itt)
+Session::write_one_audio_track (AudioTrack& track, nframes_t start, nframes_t len,     
+                              bool overwrite, vector<boost::shared_ptr<AudioSource> >& srcs, InterThreadInfo& itt)
 {
        int ret = -1;
        Playlist* playlist;
-       FileSource* fsource;
+       boost::shared_ptr<AudioFileSource> fsource;
        uint32_t x;
        char buf[PATH_MAX+1];
        string dir;
        uint32_t nchans;
-       jack_nframes_t position;
-       jack_nframes_t this_chunk;
-       jack_nframes_t to_do;
+       nframes_t position;
+       nframes_t this_chunk;
+       nframes_t to_do;
        vector<Sample*> buffers;
-       char *  workbuf = 0;
-       const jack_nframes_t chunk_size = (256 * 1024)/4;
 
-       atomic_set (&processing_prohibited, 1);
+       // any bigger than this seems to cause stack overflows in called functions
+       const nframes_t chunk_size = (128 * 1024)/4;
+
+       g_atomic_int_set (&processing_prohibited, 1);
        
        /* call tree *MUST* hold route_lock */
        
-       if ((playlist = track.disk_stream().playlist()) == 0) {
+       if ((playlist = track.diskstream()->playlist()) == 0) {
                goto out;
        }
 
@@ -3566,7 +3538,7 @@ Session::write_one_track (AudioTrack& track, jack_nframes_t start, jack_nframes_
                goto out;
        }
 
-       nchans = track.disk_stream().n_channels();
+       nchans = track.audio_diskstream()->n_channels();
        
        dir = discover_best_sound_dir ();
 
@@ -3585,7 +3557,7 @@ Session::write_one_track (AudioTrack& track, jack_nframes_t start, jack_nframes_
                }
                
                try {
-                       fsource = new FileSource (buf, frame_rate(), false, Config->get_native_file_data_format());
+                       fsource = boost::dynamic_pointer_cast<AudioFileSource> (SourceFactory::createWritable (*this, buf, false, frame_rate()));
                }
                
                catch (failed_constructor& err) {
@@ -3593,7 +3565,7 @@ Session::write_one_track (AudioTrack& track, jack_nframes_t start, jack_nframes_
                        goto out;
                }
 
-               srcs.push_back(fsource);
+               srcs.push_back (fsource);
        }
 
        /* XXX need to flush all redirects */
@@ -3613,20 +3585,22 @@ Session::write_one_track (AudioTrack& track, jack_nframes_t start, jack_nframes_
                buffers.push_back (b);
        }
 
-       workbuf = new char[chunk_size * 4];
-       
        while (to_do && !itt.cancel) {
                
                this_chunk = min (to_do, chunk_size);
                
-               if (track.export_stuff (buffers, workbuf, nchans, start, this_chunk)) {
+               if (track.export_stuff (buffers, nchans, start, this_chunk)) {
                        goto out;
                }
 
                uint32_t n = 0;
-               for (vector<Source*>::iterator src=srcs.begin(); src != srcs.end(); ++src, ++n) {
-                       if ((*src)->write (buffers[n], this_chunk, workbuf) != this_chunk) {
-                               goto out;
+               for (vector<boost::shared_ptr<AudioSource> >::iterator src=srcs.begin(); src != srcs.end(); ++src, ++n) {
+                       boost::shared_ptr<AudioFileSource> afs = boost::dynamic_pointer_cast<AudioFileSource>(*src);
+                       
+                       if (afs) {
+                               if (afs->write (buffers[n], this_chunk) != this_chunk) {
+                                       goto out;
+                               }
                        }
                }
                
@@ -3644,14 +3618,21 @@ Session::write_one_track (AudioTrack& track, jack_nframes_t start, jack_nframes_
                time (&now);
                xnow = localtime (&now);
                
-               for (vector<Source*>::iterator src=srcs.begin(); src != srcs.end(); ++src) {
-                       dynamic_cast<FileSource*>((*src))->update_header (position, *xnow, now);
+               for (vector<boost::shared_ptr<AudioSource> >::iterator src=srcs.begin(); src != srcs.end(); ++src) {
+                       boost::shared_ptr<AudioFileSource> afs = boost::dynamic_pointer_cast<AudioFileSource>(*src);
+
+                       if (afs) {
+                               afs->update_header (position, *xnow, now);
+                       }
                }
                
                /* build peakfile for new source */
                
-               for (vector<Source*>::iterator src=srcs.begin(); src != srcs.end(); ++src) {
-                       dynamic_cast<FileSource*>(*src)->build_peaks ();
+               for (vector<boost::shared_ptr<AudioSource> >::iterator src=srcs.begin(); src != srcs.end(); ++src) {
+                       boost::shared_ptr<AudioFileSource> afs = boost::dynamic_pointer_cast<AudioFileSource>(*src);
+                       if (afs) {
+                               afs->build_peaks ();
+                       }
                }
                
                ret = 0;
@@ -3659,9 +3640,14 @@ Session::write_one_track (AudioTrack& track, jack_nframes_t start, jack_nframes_
                
   out:
        if (ret) {
-               for (vector<Source*>::iterator src=srcs.begin(); src != srcs.end(); ++src) {
-                       dynamic_cast<FileSource*>(*src)->mark_for_remove ();
-                       delete *src;
+               for (vector<boost::shared_ptr<AudioSource> >::iterator src = srcs.begin(); src != srcs.end(); ++src) {
+                       boost::shared_ptr<AudioFileSource> afs = boost::dynamic_pointer_cast<AudioFileSource>(*src);
+
+                       if (afs) {
+                               afs->mark_for_remove ();
+                       }
+
+                       (*src)->drop_references ();
                }
        }
 
@@ -3669,11 +3655,7 @@ Session::write_one_track (AudioTrack& track, jack_nframes_t start, jack_nframes_
                free(*i);
        }
 
-       if (workbuf) {
-               delete [] workbuf;
-       }
-       
-       atomic_set (&processing_prohibited, 0);
+       g_atomic_int_set (&processing_prohibited, 0);
 
        itt.done = true;
 
@@ -3693,10 +3675,10 @@ uint32_t
 Session::ntracks () const
 {
        uint32_t n = 0;
-       RWLockMonitor lm (route_lock, false, __LINE__, __FILE__);
+       shared_ptr<RouteList> r = routes.reader ();
 
-       for (RouteList::const_iterator i = routes.begin(); i != routes.end(); ++i) {
-               if (dynamic_cast<AudioTrack*> (*i)) {
+       for (RouteList::const_iterator i = r->begin(); i != r->end(); ++i) {
+               if (dynamic_cast<AudioTrack*> ((*i).get())) {
                        ++n;
                }
        }
@@ -3708,10 +3690,10 @@ uint32_t
 Session::nbusses () const
 {
        uint32_t n = 0;
-       RWLockMonitor lm (route_lock, false, __LINE__, __FILE__);
+       shared_ptr<RouteList> r = routes.reader ();
 
-       for (RouteList::const_iterator i = routes.begin(); i != routes.end(); ++i) {
-               if (dynamic_cast<AudioTrack*> (*i) == 0) {
+       for (RouteList::const_iterator i = r->begin(); i != r->end(); ++i) {
+               if (dynamic_cast<AudioTrack*> ((*i).get()) == 0) {
                        ++n;
                }
        }
@@ -3720,22 +3702,13 @@ Session::nbusses () const
 }
 
 void
-Session::set_layer_model (LayerModel lm)
+Session::add_curve(Curve *curve)
 {
-       if (lm != layer_model) {
-               layer_model = lm;
-               set_dirty ();
-               ControlChanged (LayeringModel);
-       }
+    curves[curve->id()] = curve;
 }
 
 void
-Session::set_xfade_model (CrossfadeModel xm)
+Session::add_automation_list(AutomationList *al)
 {
-       if (xm != xfade_model) {
-               xfade_model = xm;
-               set_dirty ();
-               ControlChanged (CrossfadingModel);
-       }
+    automation_lists[al->id()] = al;
 }
-