13
0
livetrax/libs/ardour/butler.cc
Paul Davis 10b224790b increase butler event pool size dramatically
git-svn-id: svn://localhost/ardour2/branches/3.0@9047 d708f5d6-7413-0410-9779-e7cbd77b26cf
2011-03-02 22:41:46 +00:00

473 lines
11 KiB
C++

/*
Copyright (C) 1999-2009 Paul Davis
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <poll.h>
#include "pbd/error.h"
#include "pbd/pthread_utils.h"
#include "ardour/butler.h"
#include "ardour/crossfade.h"
#include "ardour/io.h"
#include "ardour/midi_diskstream.h"
#include "ardour/session.h"
#include "ardour/track.h"
#include "ardour/auditioner.h"
#include "i18n.h"
using namespace PBD;
static float _read_data_rate;
static float _write_data_rate;
namespace ARDOUR {
Butler::Butler(Session& s)
: SessionHandleRef (s)
, thread(0)
, audio_dstream_capture_buffer_size(0)
, audio_dstream_playback_buffer_size(0)
, midi_dstream_buffer_size(0)
, pool_trash(16)
{
g_atomic_int_set(&should_do_transport_work, 0);
SessionEvent::pool->set_trash (&pool_trash);
Config->ParameterChanged.connect_same_thread (*this, boost::bind (&Butler::config_changed, this, _1));
}
Butler::~Butler()
{
terminate_thread ();
}
void
Butler::config_changed (std::string p)
{
if (p == "playback-buffer-seconds") {
/* size is in Samples, not bytes */
audio_dstream_playback_buffer_size = (uint32_t) floor (Config->get_audio_playback_buffer_seconds() * _session.frame_rate());
_session.adjust_playback_buffering ();
} else if (p == "capture-buffer-seconds") {
audio_dstream_capture_buffer_size = (uint32_t) floor (Config->get_audio_capture_buffer_seconds() * _session.frame_rate());
_session.adjust_capture_buffering ();
}
}
int
Butler::start_thread()
{
const float rate = (float)_session.frame_rate();
/* size is in Samples, not bytes */
audio_dstream_capture_buffer_size = (uint32_t) floor (Config->get_audio_capture_buffer_seconds() * rate);
audio_dstream_playback_buffer_size = (uint32_t) floor (Config->get_audio_playback_buffer_seconds() * rate);
/* size is in bytes
* XXX: Jack needs to tell us the MIDI buffer size
* (i.e. how many MIDI bytes we might see in a cycle)
*/
midi_dstream_buffer_size = (uint32_t) floor (Config->get_midi_track_buffer_seconds() * rate);
MidiDiskstream::set_readahead_frames ((framecnt_t) (Config->get_midi_readahead() * rate));
Crossfade::set_buffer_size (audio_dstream_playback_buffer_size);
should_run = false;
if (pipe (request_pipe)) {
error << string_compose(_("Cannot create transport request signal pipe (%1)"),
strerror (errno)) << endmsg;
return -1;
}
if (fcntl (request_pipe[0], F_SETFL, O_NONBLOCK)) {
error << string_compose(_("UI: cannot set O_NONBLOCK on butler request pipe (%1)"),
strerror (errno)) << endmsg;
return -1;
}
if (fcntl (request_pipe[1], F_SETFL, O_NONBLOCK)) {
error << string_compose(_("UI: cannot set O_NONBLOCK on butler request pipe (%1)"),
strerror (errno)) << endmsg;
return -1;
}
if (pthread_create_and_store ("disk butler", &thread, _thread_work, this)) {
error << _("Session: could not create butler thread") << endmsg;
return -1;
}
//pthread_detach (thread);
return 0;
}
void
Butler::terminate_thread ()
{
if (thread) {
void* status;
const char c = Request::Quit;
(void) ::write (request_pipe[1], &c, 1);
pthread_join (thread, &status);
}
}
void *
Butler::_thread_work (void* arg)
{
SessionEvent::create_per_thread_pool ("butler events", 4096);
pthread_set_name (X_("butler"));
return ((Butler *) arg)->thread_work ();
}
void *
Butler::thread_work ()
{
uint32_t err = 0;
int32_t bytes;
bool compute_io;
microseconds_t begin, end;
struct pollfd pfd[1];
bool disk_work_outstanding = false;
RouteList::iterator i;
while (true) {
pfd[0].fd = request_pipe[0];
pfd[0].events = POLLIN|POLLERR|POLLHUP;
if (poll (pfd, 1, (disk_work_outstanding ? 0 : -1)) < 0) {
if (errno == EINTR) {
continue;
}
error << string_compose (_("poll on butler request pipe failed (%1)"),
strerror (errno))
<< endmsg;
break;
}
if (pfd[0].revents & ~POLLIN) {
error << string_compose (_("Error on butler thread request pipe: fd=%1 err=%2"), pfd[0].fd, pfd[0].revents) << endmsg;
break;
}
if (pfd[0].revents & POLLIN) {
char req;
/* empty the pipe of all current requests */
while (1) {
size_t nread = ::read (request_pipe[0], &req, sizeof (req));
if (nread == 1) {
switch ((Request::Type) req) {
case Request::Wake:
break;
case Request::Run:
should_run = true;
break;
case Request::Pause:
should_run = false;
break;
case Request::Quit:
pthread_exit_pbd (0);
/*NOTREACHED*/
break;
default:
break;
}
} else if (nread == 0) {
break;
} else if (errno == EAGAIN) {
break;
} else {
fatal << _("Error reading from butler request pipe") << endmsg;
/*NOTREACHED*/
}
}
}
bytes = 0;
compute_io = true;
restart:
disk_work_outstanding = false;
if (transport_work_requested()) {
_session.butler_transport_work ();
}
begin = get_microseconds();
boost::shared_ptr<RouteList> rl = _session.get_routes();
RouteList rl_with_auditioner = *rl;
rl_with_auditioner.push_back (_session.the_auditioner());
// for (i = dsl->begin(); i != dsl->end(); ++i) {
// cerr << "BEFORE " << (*i)->name() << ": pb = " << (*i)->playback_buffer_load() << " cp = " << (*i)->capture_buffer_load() << endl;
// }
for (i = rl_with_auditioner.begin(); !transport_work_requested() && should_run && i != rl_with_auditioner.end(); ++i) {
boost::shared_ptr<Track> tr = boost::dynamic_pointer_cast<Track> (*i);
if (!tr) {
continue;
}
/* don't read inactive tracks */
boost::shared_ptr<IO> io = tr->input ();
if (io && !io->active()) {
continue;
}
switch (tr->do_refill ()) {
case 0:
bytes += tr->read_data_count();
break;
case 1:
bytes += tr->read_data_count();
disk_work_outstanding = true;
break;
default:
compute_io = false;
error << string_compose(_("Butler read ahead failure on dstream %1"), (*i)->name()) << endmsg;
break;
}
}
if (i != rl_with_auditioner.begin() && i != rl_with_auditioner.end()) {
/* we didn't get to all the streams */
disk_work_outstanding = true;
}
if (!err && transport_work_requested()) {
goto restart;
}
if (compute_io) {
end = get_microseconds();
if (end - begin > 0) {
_read_data_rate = (float) bytes / (float) (end - begin);
} else {
_read_data_rate = 0; // infinity better
}
}
bytes = 0;
compute_io = true;
begin = get_microseconds();
for (i = rl->begin(); !transport_work_requested() && should_run && i != rl->end(); ++i) {
// cerr << "write behind for " << (*i)->name () << endl;
boost::shared_ptr<Track> tr = boost::dynamic_pointer_cast<Track> (*i);
if (!tr) {
continue;
}
/* note that we still try to flush diskstreams attached to inactive routes
*/
switch (tr->do_flush (ButlerContext)) {
case 0:
bytes += tr->write_data_count();
break;
case 1:
bytes += tr->write_data_count();
disk_work_outstanding = true;
break;
default:
err++;
compute_io = false;
error << string_compose(_("Butler write-behind failure on dstream %1"), (*i)->name()) << endmsg;
/* don't break - try to flush all streams in case they
are split across disks.
*/
}
}
if (err && _session.actively_recording()) {
/* stop the transport and try to catch as much possible
captured state as we can.
*/
_session.request_stop ();
}
if (i != rl->begin() && i != rl->end()) {
/* we didn't get to all the streams */
disk_work_outstanding = true;
}
if (!err && transport_work_requested()) {
goto restart;
}
if (compute_io) {
// there are no apparent users for this calculation?
end = get_microseconds();
if (end - begin > 0) {
_write_data_rate = (float) bytes / (float) (end - begin);
} else {
_write_data_rate = 0; // Well, infinity would be better
}
}
if (!disk_work_outstanding) {
_session.refresh_disk_space ();
}
{
Glib::Mutex::Lock lm (request_lock);
if (should_run && (disk_work_outstanding || transport_work_requested())) {
// for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
// cerr << "AFTER " << (*i)->name() << ": pb = " << (*i)->playback_buffer_load() << " cp = " << (*i)->capture_buffer_load() << endl;
// }
goto restart;
}
paused.signal();
}
empty_pool_trash ();
}
pthread_exit_pbd (0);
/*NOTREACHED*/
return (0);
}
void
Butler::schedule_transport_work ()
{
g_atomic_int_inc (&should_do_transport_work);
summon ();
}
void
Butler::summon ()
{
char c = Request::Run;
(void) ::write (request_pipe[1], &c, 1);
}
void
Butler::stop ()
{
Glib::Mutex::Lock lm (request_lock);
char c = Request::Pause;
(void) ::write (request_pipe[1], &c, 1);
paused.wait(request_lock);
}
void
Butler::wait_until_finished ()
{
Glib::Mutex::Lock lm (request_lock);
char c = Request::Wake;
(void) ::write (request_pipe[1], &c, 1);
paused.wait(request_lock);
}
bool
Butler::transport_work_requested () const
{
return g_atomic_int_get(&should_do_transport_work);
}
float
Butler::read_data_rate () const
{
/* disk i/o in excess of 10000MB/sec indicate the buffer cache
in action. ignore it.
*/
return _read_data_rate > 10485.7600000f ? 0.0f : _read_data_rate;
}
float
Butler::write_data_rate () const
{
/* disk i/o in excess of 10000MB/sec indicate the buffer cache
in action. ignore it.
*/
return _write_data_rate > 10485.7600000f ? 0.0f : _write_data_rate;
}
void
Butler::empty_pool_trash ()
{
/* look in the trash, deleting empty pools until we come to one that is not empty */
RingBuffer<CrossThreadPool*>::rw_vector vec;
pool_trash.get_read_vector (&vec);
guint deleted = 0;
for (int i = 0; i < 2; ++i) {
for (guint j = 0; j < vec.len[i]; ++j) {
if (vec.buf[i][j]->empty()) {
delete vec.buf[i][j];
++deleted;
} else {
/* found a non-empty pool, so stop deleting */
if (deleted) {
pool_trash.increment_read_idx (deleted);
}
return;
}
}
}
if (deleted) {
pool_trash.increment_read_idx (deleted);
}
}
void
Butler::drop_references ()
{
SessionEvent::pool->set_trash (0);
}
} // namespace ARDOUR