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authorMax Kellermann <max@duempel.org>2011-09-01 07:13:21 +0200
committerMax Kellermann <max@duempel.org>2011-09-01 07:13:21 +0200
commit8b0b4ff0860ea93850c2f44e72e8a8a5de05e13b (patch)
treeda2adaaa75382333d934869b530ae416a922baf1 /src/output_control.c
parent60f7ff3de594ef6b54a61b6ad630819ce026c760 (diff)
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output_thread: reimplement CANCEL synchronization
The output thread could hang indefinitely after finishing CANCEL, because it could have missed the signal while the output was not unlocked in ao_command_finished(). This patch removes the wait() call after CANCEL, and adds the flag "allow_play" instead. While this flag is set, playback is skipped. With this flag, there will not be any excess wait() call after the pipe has been cleared. This patch fixes a bug that causes mpd to discontinue playback after seeking, due to the race condition described above.
Diffstat (limited to 'src/output_control.c')
-rw-r--r--src/output_control.c18
1 files changed, 13 insertions, 5 deletions
diff --git a/src/output_control.c b/src/output_control.c
index 0823b667b..14976dbfb 100644
--- a/src/output_control.c
+++ b/src/output_control.c
@@ -115,6 +115,8 @@ audio_output_open(struct audio_output *ao,
{
bool open;
+ assert(ao != NULL);
+ assert(ao->allow_play);
assert(audio_format_valid(audio_format));
assert(mp != NULL);
@@ -140,10 +142,6 @@ audio_output_open(struct audio_output *ao,
/* we're not using audio_output_cancel() here,
because that function is asynchronous */
ao_command(ao, AO_COMMAND_CANCEL);
-
- /* the audio output is now waiting for a
- signal; wake it up immediately */
- g_cond_signal(ao->cond);
}
return true;
@@ -181,6 +179,7 @@ static void
audio_output_close_locked(struct audio_output *ao)
{
assert(ao != NULL);
+ assert(ao->allow_play);
if (ao->mixer != NULL)
mixer_auto_close(ao->mixer);
@@ -223,6 +222,8 @@ audio_output_play(struct audio_output *ao)
{
g_mutex_lock(ao->mutex);
+ assert(ao->allow_play);
+
if (audio_output_is_open(ao))
g_cond_signal(ao->cond);
@@ -238,6 +239,7 @@ void audio_output_pause(struct audio_output *ao)
mixer_auto_close(ao->mixer);
g_mutex_lock(ao->mutex);
+ assert(ao->allow_play);
if (audio_output_is_open(ao))
ao_command_async(ao, AO_COMMAND_PAUSE);
g_mutex_unlock(ao->mutex);
@@ -247,6 +249,7 @@ void
audio_output_drain_async(struct audio_output *ao)
{
g_mutex_lock(ao->mutex);
+ assert(ao->allow_play);
if (audio_output_is_open(ao))
ao_command_async(ao, AO_COMMAND_DRAIN);
g_mutex_unlock(ao->mutex);
@@ -255,8 +258,12 @@ audio_output_drain_async(struct audio_output *ao)
void audio_output_cancel(struct audio_output *ao)
{
g_mutex_lock(ao->mutex);
- if (audio_output_is_open(ao))
+
+ if (audio_output_is_open(ao)) {
+ ao->allow_play = false;
ao_command_async(ao, AO_COMMAND_CANCEL);
+ }
+
g_mutex_unlock(ao->mutex);
}
@@ -287,6 +294,7 @@ void audio_output_finish(struct audio_output *ao)
if (ao->thread != NULL) {
g_mutex_lock(ao->mutex);
+ assert(ao->allow_play);
ao_command(ao, AO_COMMAND_KILL);
g_mutex_unlock(ao->mutex);
g_thread_join(ao->thread);