fix crash when copy'ing latent plugins

[ardour.git] / libs / ardour / session_process.cc

diff --git a/libs/ardour/session_process.cc b/libs/ardour/session_process.cc
index d65fe3d56d72c5739ce41f70a0342ca7f54cb402..eaa1d055038cf48b610933f40b3ca48da356f29e 100644 (file)
--- a/libs/ardour/session_process.cc
+++ b/libs/ardour/session_process.cc
@@ -43,7 +43,7 @@
 
 #include "midi++/mmc.h"
 
-#include "i18n.h"
+#include "pbd/i18n.h"
 
 using namespace ARDOUR;
 using namespace PBD;
@@ -75,7 +75,7 @@ Session::process (pframes_t nframes)
 
        (this->*process_function) (nframes);
 
-       /* realtime-safe meter-position changes
+       /* realtime-safe meter-position and processor-order changes
         *
         * ideally this would be done in
         * Route::process_output_buffers() but various functions
@@ -83,7 +83,19 @@ Session::process (pframes_t nframes)
         */
        boost::shared_ptr<RouteList> r = routes.reader ();
        for (RouteList::const_iterator i = r->begin(); i != r->end(); ++i) {
-               (*i)->apply_processor_changes_rt();
+               if ((*i)->apply_processor_changes_rt()) {
+                       _rt_emit_pending = true;
+               }
+       }
+       if (_rt_emit_pending) {
+               if (!_rt_thread_active) {
+                       emit_route_signals ();
+               }
+               if (pthread_mutex_trylock (&_rt_emit_mutex) == 0) {
+                       pthread_cond_signal (&_rt_emit_cond);
+                       pthread_mutex_unlock (&_rt_emit_mutex);
+                       _rt_emit_pending = false;
+               }
        }
 
        _engine.main_thread()->drop_buffers ();
@@ -118,10 +130,10 @@ int
 Session::no_roll (pframes_t nframes)
 {
        PT_TIMING_CHECK (4);
-       
+
        framepos_t end_frame = _transport_frame + nframes; // FIXME: varispeed + no_roll ??
        int ret = 0;
-       int declick = get_transport_declick_required();
+       int declick = (config.get_use_transport_fades() ? get_transport_declick_required() : false);
        boost::shared_ptr<RouteList> r = routes.reader ();
 
        if (_click_io) {
@@ -162,12 +174,12 @@ Session::no_roll (pframes_t nframes)
 int
 Session::process_routes (pframes_t nframes, bool& need_butler)
 {
-       int  declick = get_transport_declick_required();
+       int declick = (config.get_use_transport_fades() ? get_transport_declick_required() : false);
        boost::shared_ptr<RouteList> r = routes.reader ();
 
        const framepos_t start_frame = _transport_frame;
        const framepos_t end_frame = _transport_frame + floor (nframes * _transport_speed);
-       
+
        if (_process_graph) {
                DEBUG_TRACE(DEBUG::ProcessThreads,"calling graph/process-routes\n");
                if (_process_graph->process_routes (nframes, start_frame, end_frame, declick, need_butler) < 0) {
@@ -272,7 +284,7 @@ void
 Session::process_with_events (pframes_t nframes)
 {
        PT_TIMING_CHECK (3);
-       
+
        SessionEvent*  ev;
        pframes_t      this_nframes;
        framepos_t     end_frame;
@@ -346,6 +358,7 @@ Session::process_with_events (pframes_t nframes)
        }
 
        if (events.empty() || next_event == events.end()) {
+               try_run_lua (nframes); // also during export ?? ->move to process_without_events()
                process_without_events (nframes);
                return;
        }
@@ -413,6 +426,8 @@ Session::process_with_events (pframes_t nframes)
                                this_nframes = abs (floor(frames_moved / _transport_speed));
                        }
 
+                       try_run_lua (this_nframes);
+
                        if (this_nframes) {
 
                                click (_transport_frame, this_nframes);
@@ -1209,7 +1224,7 @@ Session::compute_stop_limit () const
                return max_framepos;
        }
 
-       
+
        bool const punching_in = (config.get_punch_in () && _locations->auto_punch_location());
        bool const punching_out = (config.get_punch_out () && _locations->auto_punch_location());
 
@@ -1226,3 +1241,79 @@ Session::compute_stop_limit () const
 
        return current_end_frame ();
 }
+
+
+
+/* dedicated thread for signal emission.
+ *
+ * while sending cross-thread signals from the process thread
+ * is fine in general, PBD::Signal's use of boost::function and
+ * boost:bind can produce a vast overhead which is not
+ * acceptable for low latency.
+ *
+ * This works around the issue by moving the boost overhead
+ * out of the RT thread. The overall load is probably higher but
+ * the realtime thread remains unaffected.
+ */
+
+void
+Session::emit_route_signals ()
+{
+       // TODO use RAII to allow using these signals in other places
+       BatchUpdateStart(); /* EMIT SIGNAL */
+       boost::shared_ptr<RouteList> r = routes.reader ();
+       for (RouteList::const_iterator ci = r->begin(); ci != r->end(); ++ci) {
+               (*ci)->emit_pending_signals ();
+       }
+       BatchUpdateEnd(); /* EMIT SIGNAL */
+}
+
+void
+Session::emit_thread_start ()
+{
+       if (_rt_thread_active) {
+               return;
+       }
+       _rt_thread_active = true;
+
+       if (pthread_create (&_rt_emit_thread, NULL, emit_thread, this)) {
+               _rt_thread_active = false;
+       }
+}
+
+void
+Session::emit_thread_terminate ()
+{
+       if (!_rt_thread_active) {
+               return;
+       }
+       _rt_thread_active = false;
+
+       if (pthread_mutex_lock (&_rt_emit_mutex) == 0) {
+               pthread_cond_signal (&_rt_emit_cond);
+               pthread_mutex_unlock (&_rt_emit_mutex);
+       }
+
+       void *status;
+       pthread_join (_rt_emit_thread, &status);
+}
+
+void *
+Session::emit_thread (void *arg)
+{
+       Session *s = static_cast<Session *>(arg);
+       s->emit_thread_run ();
+       pthread_exit (0);
+       return 0;
+}
+
+void
+Session::emit_thread_run ()
+{
+       pthread_mutex_lock (&_rt_emit_mutex);
+       while (_rt_thread_active) {
+               emit_route_signals();
+               pthread_cond_wait (&_rt_emit_cond, &_rt_emit_mutex);
+       }
+       pthread_mutex_unlock (&_rt_emit_mutex);
+}