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Avoid deadlocks that sometimes happened when starting a scrub...

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This commit is contained in:
Paul Licameli 2016-05-16 18:22:22 -04:00
commit ceb1a91cb9
1 changed files with 13 additions and 3 deletions
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16
src/AudioIO.cpp
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@ -410,6 +410,14 @@ struct AudioIO::ScrubQueue
return previous.mS1 / mRate;
}
// This is for avoiding deadlocks while starting a scrub:
// Audio stream needs to be unblocked
void Nudge()
{
wxMutexLocker locker(mUpdating);
mAvailable.Signal();
}
void PoisonPill()
{
// Main thread is shutting down the scrubbing
@ -478,8 +486,7 @@ struct AudioIO::ScrubQueue
}
else
{
wxASSERT(mPoisoned);
// We got the shut-down signal
// We got the shut-down signal, or we got nudged
startSample = endSample = duration = -1L;
}
}
@ -1874,8 +1881,11 @@ int AudioIO::StartStream(const WaveTrackArray &playbackTracks,
// FillBuffers will ALWAYS get called from the Audio thread.
mAudioThreadShouldCallFillBuffersOnce = true;
while( mAudioThreadShouldCallFillBuffersOnce == true )
while( mAudioThreadShouldCallFillBuffersOnce == true ) {
if (mScrubQueue)
mScrubQueue->Nudge();
wxMilliSleep( 50 );
}
#ifdef EXPERIMENTAL_MIDI_OUT
// if no playback, reset the midi time to zero to roughly sync