libs/ardour/session_butler.cc

   1 /*
   2     Copyright (C) 1999-2002 Paul Davis
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17
  18 */
  19
  20 #include <algorithm>
  21 #include <string>
  22 #include <cmath>
  23 #include <cerrno>
  24 #include <unistd.h>
  25 #include <fcntl.h>
  26 #include <poll.h>
  27
  28 #include <glibmm/thread.h>
  29
  30 #include <pbd/error.h>
  31 #include <pbd/pthread_utils.h>
  32
  33 #include <ardour/configuration.h>
  34 #include <ardour/audioengine.h>
  35 #include <ardour/session.h>
  36 #include <ardour/audio_diskstream.h>
  37 #include <ardour/crossfade.h>
  38 #include <ardour/timestamps.h>
  39
  40 #include "i18n.h"
  41
  42 using namespace std;
  43 using namespace ARDOUR;
  44 using namespace PBD;
  45
  46 static float _read_data_rate;
  47 static float _write_data_rate;
  48
  49 /* XXX put this in the right place */
  50
  51 static inline uint32_t next_power_of_two (uint32_t n)
  52 {
  53         --n;
  54         n |= n >> 16;
  55         n |= n >> 8;
  56         n |= n >> 4;
  57         n |= n >> 2;
  58         n |= n >> 1;
  59         ++n;
  60         return n;
  61 }
  62
  63 /*---------------------------------------------------------------------------
  64  BUTLER THREAD
  65  ---------------------------------------------------------------------------*/
  66
  67 int
  68 Session::start_butler_thread ()
  69 {
  70         /* size is in Samples, not bytes */
  71
  72         dstream_buffer_size = (uint32_t) floor (Config->get_track_buffer_seconds() * (float) frame_rate());
  73
  74         Crossfade::set_buffer_size (dstream_buffer_size);
  75
  76         butler_should_run = false;
  77
  78         if (pipe (butler_request_pipe)) {
  79                 error << string_compose(_("Cannot create transport request signal pipe (%1)"), strerror (errno)) << endmsg;
  80                 return -1;
  81         }
  82
  83         if (fcntl (butler_request_pipe[0], F_SETFL, O_NONBLOCK)) {
  84                 error << string_compose(_("UI: cannot set O_NONBLOCK on butler request pipe (%1)"), strerror (errno)) << endmsg;
  85                 return -1;
  86         }
  87
  88         if (fcntl (butler_request_pipe[1], F_SETFL, O_NONBLOCK)) {
  89                 error << string_compose(_("UI: cannot set O_NONBLOCK on butler request pipe (%1)"), strerror (errno)) << endmsg;
  90                 return -1;
  91         }
  92
  93         if (pthread_create_and_store ("disk butler", &butler_thread, 0, _butler_thread_work, this)) {
  94                 error << _("Session: could not create butler thread") << endmsg;
  95                 return -1;
  96         }
  97
  98         // pthread_detach (butler_thread);
  99
 100         return 0;
 101 }
 102
 103 void
 104 Session::terminate_butler_thread ()
 105 {
 106         if (butler_thread) {
 107                 void* status;
 108                 char c = ButlerRequest::Quit;
 109                 ::write (butler_request_pipe[1], &c, 1);
 110                 pthread_join (butler_thread, &status);
 111         }
 112 }
 113
 114 void
 115 Session::schedule_butler_transport_work ()
 116 {
 117         g_atomic_int_inc (&butler_should_do_transport_work);
 118         summon_butler ();
 119 }
 120
 121 void
 122 Session::schedule_curve_reallocation ()
 123 {
 124         post_transport_work = PostTransportWork (post_transport_work | PostTransportCurveRealloc);
 125         schedule_butler_transport_work ();
 126 }
 127
 128 void
 129 Session::summon_butler ()
 130 {
 131         char c = ButlerRequest::Run;
 132         ::write (butler_request_pipe[1], &c, 1);
 133 }
 134
 135 void
 136 Session::stop_butler ()
 137 {
 138         Glib::Mutex::Lock lm (butler_request_lock);
 139         char c = ButlerRequest::Pause;
 140         ::write (butler_request_pipe[1], &c, 1);
 141         butler_paused.wait(butler_request_lock);
 142 }
 143
 144 void
 145 Session::wait_till_butler_finished ()
 146 {
 147         Glib::Mutex::Lock lm (butler_request_lock);
 148         char c = ButlerRequest::Wake;
 149         ::write (butler_request_pipe[1], &c, 1);
 150         butler_paused.wait(butler_request_lock);
 151 }
 152
 153 void *
 154 Session::_butler_thread_work (void* arg)
 155 {
 156         PBD::ThreadCreated (pthread_self(), X_("Butler"));
 157         return ((Session *) arg)->butler_thread_work ();
 158         return 0;
 159 }
 160
 161 void *
 162 Session::butler_thread_work ()
 163 {
 164         uint32_t err = 0;
 165         int32_t bytes;
 166         bool compute_io;
 167         struct timeval begin, end;
 168         struct pollfd pfd[1];
 169         bool disk_work_outstanding = false;
 170         DiskstreamList::iterator i;
 171
 172         while (true) {
 173                 pfd[0].fd = butler_request_pipe[0];
 174                 pfd[0].events = POLLIN|POLLERR|POLLHUP;
 175
 176                 if (poll (pfd, 1, (disk_work_outstanding ? 0 : -1)) < 0) {
 177
 178                         if (errno == EINTR) {
 179                                 continue;
 180                         }
 181
 182                         error << string_compose (_("poll on butler request pipe failed (%1)"),
 183                                           strerror (errno))
 184                               << endmsg;
 185                         break;
 186                 }
 187
 188                 if (pfd[0].revents & ~POLLIN) {
 189                         error << string_compose (_("Error on butler thread request pipe: fd=%1 err=%2"), pfd[0].fd, pfd[0].revents) << endmsg;
 190                         break;
 191                 }
 192
 193                 if (pfd[0].revents & POLLIN) {
 194
 195                         char req;
 196
 197                         /* empty the pipe of all current requests */
 198
 199                         while (1) {
 200                                 size_t nread = ::read (butler_request_pipe[0], &req, sizeof (req));
 201                                 if (nread == 1) {
 202
 203                                         switch ((ButlerRequest::Type) req) {
 204
 205                                         case ButlerRequest::Wake:
 206                                                 break;
 207
 208                                         case ButlerRequest::Run:
 209                                                 butler_should_run = true;
 210                                                 break;
 211
 212                                         case ButlerRequest::Pause:
 213                                                 butler_should_run = false;
 214                                                 break;
 215
 216                                         case ButlerRequest::Quit:
 217                                                 pthread_exit_pbd (0);
 218                                                 /*NOTREACHED*/
 219                                                 break;
 220
 221                                         default:
 222                                                 break;
 223                                         }
 224
 225                                 } else if (nread == 0) {
 226                                         break;
 227                                 } else if (errno == EAGAIN) {
 228                                         break;
 229                                 } else {
 230                                         fatal << _("Error reading from butler request pipe") << endmsg;
 231                                         /*NOTREACHED*/
 232                                 }
 233                         }
 234                 }
 235
 236                 //for (i = diskstreams.begin(); i != diskstreams.end(); ++i) {
 237                         // cerr << "BEFORE " << (*i)->name() << ": pb = " << (*i)->playback_buffer_load() << " cp = " << (*i)->capture_buffer_load() << endl;
 238                 //}
 239
 240                 if (transport_work_requested()) {
 241                         butler_transport_work ();
 242                 }
 243
 244                 disk_work_outstanding = false;
 245                 bytes = 0;
 246                 compute_io = true;
 247
 248                 gettimeofday (&begin, 0);
 249
 250                 boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader ();
 251
 252                 for (i = dsl->begin(); !transport_work_requested() && butler_should_run && i != dsl->end(); ++i) {
 253
 254                         boost::shared_ptr<Diskstream> ds = *i;
 255
 256                         switch (ds->do_refill ()) {
 257                         case 0:
 258                                 bytes += ds->read_data_count();
 259                                 break;
 260                         case 1:
 261                                 bytes += ds->read_data_count();
 262                                 disk_work_outstanding = true;
 263                                 break;
 264
 265                         default:
 266                                 compute_io = false;
 267                                 error << string_compose(_("Butler read ahead failure on dstream %1"), (*i)->name()) << endmsg;
 268                                 break;
 269                         }
 270
 271                 }
 272
 273                 if (i != dsl->end()) {
 274                         /* we didn't get to all the streams */
 275                         disk_work_outstanding = true;
 276                 }
 277
 278                 if (!err && transport_work_requested()) {
 279                         continue;
 280                 }
 281
 282                 if (compute_io) {
 283                         gettimeofday (&end, 0);
 284
 285                         double b = begin.tv_sec  + (begin.tv_usec/1000000.0);
 286                         double e = end.tv_sec + (end.tv_usec / 1000000.0);
 287
 288                         _read_data_rate = bytes / (e - b);
 289                 }
 290
 291                 bytes = 0;
 292                 compute_io = true;
 293                 gettimeofday (&begin, 0);
 294
 295                 for (i = dsl->begin(); !transport_work_requested() && butler_should_run && i != dsl->end(); ++i) {
 296                         // cerr << "write behind for " << (*i)->name () << endl;
 297
 298                         switch ((*i)->do_flush (Session::ButlerContext)) {
 299                         case 0:
 300                                 bytes += (*i)->write_data_count();
 301                                 break;
 302                         case 1:
 303                                 bytes += (*i)->write_data_count();
 304                                 disk_work_outstanding = true;
 305                                 break;
 306
 307                         default:
 308                                 err++;
 309                                 compute_io = false;
 310                                 error << string_compose(_("Butler write-behind failure on dstream %1"), (*i)->name()) << endmsg;
 311                                 /* don't break - try to flush all streams in case they
 312                                    are split across disks.
 313                                 */
 314                         }
 315                 }
 316
 317                 if (err && actively_recording()) {
 318                         /* stop the transport and try to catch as much possible
 319                            captured state as we can.
 320                         */
 321                         request_stop ();
 322                 }
 323
 324                 if (i != dsl->end()) {
 325                         /* we didn't get to all the streams */
 326                         disk_work_outstanding = true;
 327                 }
 328
 329                 if (!err && transport_work_requested()) {
 330                         continue;
 331                 }
 332
 333                 if (compute_io) {
 334                         gettimeofday (&end, 0);
 335
 336                         double b = begin.tv_sec  + (begin.tv_usec/1000000.0);
 337                         double e = end.tv_sec + (end.tv_usec / 1000000.0);
 338
 339                         _write_data_rate = bytes / (e - b);
 340                 }
 341
 342                 if (!disk_work_outstanding) {
 343                         refresh_disk_space ();
 344                 }
 345
 346
 347                 {
 348                         Glib::Mutex::Lock lm (butler_request_lock);
 349
 350                         if (butler_should_run && (disk_work_outstanding || transport_work_requested())) {
 351 //                              for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
 352 //                                      cerr << "AFTER " << (*i)->name() << ": pb = " << (*i)->playback_buffer_load() << " cp = " << (*i)->capture_buffer_load() << endl;
 353 //                              }
 354
 355                                 continue;
 356                         }
 357
 358                         butler_paused.signal();
 359                 }
 360         }
 361
 362         pthread_exit_pbd (0);
 363         /*NOTREACHED*/
 364         return (0);
 365 }
 366
 367
 368 void
 369 Session::request_overwrite_buffer (Diskstream* stream)
 370 {
 371         Event *ev = new Event (Event::Overwrite, Event::Add, Event::Immediate, 0, 0, 0.0);
 372         ev->set_ptr (stream);
 373         queue_event (ev);
 374 }
 375
 376 /** Process thread. */
 377 void
 378 Session::overwrite_some_buffers (Diskstream* ds)
 379 {
 380         if (actively_recording()) {
 381                 return;
 382         }
 383
 384         if (ds) {
 385
 386                 ds->set_pending_overwrite (true);
 387
 388         } else {
 389
 390                 boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
 391                 for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
 392                         (*i)->set_pending_overwrite (true);
 393                 }
 394         }
 395
 396         post_transport_work = PostTransportWork (post_transport_work | PostTransportOverWrite);
 397         schedule_butler_transport_work ();
 398 }
 399
 400 float
 401 Session::read_data_rate () const
 402 {
 403         /* disk i/o in excess of 10000MB/sec indicate the buffer cache
 404            in action. ignore it.
 405         */
 406         return _read_data_rate > 10485760000.0f ? 0.0f : _read_data_rate;
 407 }
 408
 409 float
 410 Session::write_data_rate () const
 411 {
 412         /* disk i/o in excess of 10000MB/sec indicate the buffer cache
 413            in action. ignore it.
 414         */
 415         return _write_data_rate > 10485760000.0f ? 0.0f : _write_data_rate;
 416 }
 417
 418 uint32_t
 419 Session::playback_load ()
 420 {
 421         return (uint32_t) g_atomic_int_get (&_playback_load);
 422 }
 423
 424 uint32_t
 425 Session::capture_load ()
 426 {
 427         return (uint32_t) g_atomic_int_get (&_capture_load);
 428 }
 429
 430 uint32_t
 431 Session::playback_load_min ()
 432 {
 433         return (uint32_t) g_atomic_int_get (&_playback_load_min);
 434 }
 435
 436 uint32_t
 437 Session::capture_load_min ()
 438 {
 439         return (uint32_t) g_atomic_int_get (&_capture_load_min);
 440 }
 441
 442 void
 443 Session::reset_capture_load_min ()
 444 {
 445         g_atomic_int_set (&_capture_load_min, 100);
 446 }
 447
 448
 449 void
 450 Session::reset_playback_load_min ()
 451 {
 452         g_atomic_int_set (&_playback_load_min, 100);
 453 }