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                 if (transport_work_requested()) {
 237                         butler_transport_work ();
 238                 }
 239
 240                 disk_work_outstanding = false;
 241                 bytes = 0;
 242                 compute_io = true;
 243
 244                 gettimeofday (&begin, 0);
 245
 246                 boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader ();
 247
 248 //              for (i = dsl->begin(); i != dsl->end(); ++i) {
 249 //                      cerr << "BEFORE " << (*i)->name() << ": pb = " << (*i)->playback_buffer_load() << " cp = " << (*i)->capture_buffer_load() << endl;
 250 //              }
 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                         /* don't read inactive tracks */
 257
 258                         /*IO* io = ds->io();
 259
 260                         if (io && !io->active()) {
 261                                 continue;
 262                         }*/
 263
 264                         switch (ds->do_refill ()) {
 265                         case 0:
 266                                 bytes += ds->read_data_count();
 267                                 break;
 268                         case 1:
 269                                 bytes += ds->read_data_count();
 270                                 disk_work_outstanding = true;
 271                                 break;
 272
 273                         default:
 274                                 compute_io = false;
 275                                 error << string_compose(_("Butler read ahead failure on dstream %1"), (*i)->name()) << endmsg;
 276                                 break;
 277                         }
 278
 279                 }
 280
 281                 if (i != dsl->end()) {
 282                         /* we didn't get to all the streams */
 283                         disk_work_outstanding = true;
 284                 }
 285
 286                 if (!err && transport_work_requested()) {
 287                         continue;
 288                 }
 289
 290                 if (compute_io) {
 291                         gettimeofday (&end, 0);
 292
 293                         double b = begin.tv_sec  + (begin.tv_usec/1000000.0);
 294                         double e = end.tv_sec + (end.tv_usec / 1000000.0);
 295
 296                         _read_data_rate = bytes / (e - b);
 297                 }
 298
 299                 bytes = 0;
 300                 compute_io = true;
 301                 gettimeofday (&begin, 0);
 302
 303                 for (i = dsl->begin(); !transport_work_requested() && butler_should_run && i != dsl->end(); ++i) {
 304                         // cerr << "write behind for " << (*i)->name () << endl;
 305
 306                         /* note that we still try to flush diskstreams attached to inactive routes
 307                          */
 308
 309                         switch ((*i)->do_flush (Session::ButlerContext)) {
 310                         case 0:
 311                                 bytes += (*i)->write_data_count();
 312                                 break;
 313                         case 1:
 314                                 bytes += (*i)->write_data_count();
 315                                 disk_work_outstanding = true;
 316                                 break;
 317
 318                         default:
 319                                 err++;
 320                                 compute_io = false;
 321                                 error << string_compose(_("Butler write-behind failure on dstream %1"), (*i)->name()) << endmsg;
 322                                 /* don't break - try to flush all streams in case they
 323                                    are split across disks.
 324                                 */
 325                         }
 326                 }
 327
 328                 if (err && actively_recording()) {
 329                         /* stop the transport and try to catch as much possible
 330                            captured state as we can.
 331                         */
 332                         request_stop ();
 333                 }
 334
 335                 if (i != dsl->end()) {
 336                         /* we didn't get to all the streams */
 337                         disk_work_outstanding = true;
 338                 }
 339
 340                 if (!err && transport_work_requested()) {
 341                         continue;
 342                 }
 343
 344                 if (compute_io) {
 345                         gettimeofday (&end, 0);
 346
 347                         double b = begin.tv_sec  + (begin.tv_usec/1000000.0);
 348                         double e = end.tv_sec + (end.tv_usec / 1000000.0);
 349
 350                         _write_data_rate = bytes / (e - b);
 351                 }
 352
 353                 if (!disk_work_outstanding) {
 354                         refresh_disk_space ();
 355                 }
 356
 357
 358                 {
 359                         Glib::Mutex::Lock lm (butler_request_lock);
 360
 361                         if (butler_should_run && (disk_work_outstanding || transport_work_requested())) {
 362 //                              for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
 363 //                                      cerr << "AFTER " << (*i)->name() << ": pb = " << (*i)->playback_buffer_load() << " cp = " << (*i)->capture_buffer_load() << endl;
 364 //                              }
 365
 366                                 continue;
 367                         }
 368
 369                         butler_paused.signal();
 370                 }
 371         }
 372
 373         pthread_exit_pbd (0);
 374         /*NOTREACHED*/
 375         return (0);
 376 }
 377
 378
 379 void
 380 Session::request_overwrite_buffer (Diskstream* stream)
 381 {
 382         Event *ev = new Event (Event::Overwrite, Event::Add, Event::Immediate, 0, 0, 0.0);
 383         ev->set_ptr (stream);
 384         queue_event (ev);
 385 }
 386
 387 /** Process thread. */
 388 void
 389 Session::overwrite_some_buffers (Diskstream* ds)
 390 {
 391         if (actively_recording()) {
 392                 return;
 393         }
 394
 395         if (ds) {
 396
 397                 ds->set_pending_overwrite (true);
 398
 399         } else {
 400
 401                 boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
 402                 for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
 403                         (*i)->set_pending_overwrite (true);
 404                 }
 405         }
 406
 407         post_transport_work = PostTransportWork (post_transport_work | PostTransportOverWrite);
 408         schedule_butler_transport_work ();
 409 }
 410
 411 float
 412 Session::read_data_rate () const
 413 {
 414         /* disk i/o in excess of 10000MB/sec indicate the buffer cache
 415            in action. ignore it.
 416         */
 417         return _read_data_rate > 10485760000.0f ? 0.0f : _read_data_rate;
 418 }
 419
 420 float
 421 Session::write_data_rate () const
 422 {
 423         /* disk i/o in excess of 10000MB/sec indicate the buffer cache
 424            in action. ignore it.
 425         */
 426         return _write_data_rate > 10485760000.0f ? 0.0f : _write_data_rate;
 427 }
 428
 429 uint32_t
 430 Session::playback_load ()
 431 {
 432         return (uint32_t) g_atomic_int_get (&_playback_load);
 433 }
 434
 435 uint32_t
 436 Session::capture_load ()
 437 {
 438         return (uint32_t) g_atomic_int_get (&_capture_load);
 439 }
 440
 441 uint32_t
 442 Session::playback_load_min ()
 443 {
 444         return (uint32_t) g_atomic_int_get (&_playback_load_min);
 445 }
 446
 447 uint32_t
 448 Session::capture_load_min ()
 449 {
 450         return (uint32_t) g_atomic_int_get (&_capture_load_min);
 451 }
 452
 453 void
 454 Session::reset_capture_load_min ()
 455 {
 456         g_atomic_int_set (&_capture_load_min, 100);
 457 }
 458
 459
 460 void
 461 Session::reset_playback_load_min ()
 462 {
 463         g_atomic_int_set (&_playback_load_min, 100);
 464 }