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On macOS 11.3.1, Core Audio calls AudioDeviceIOProc after calling an internal function named HALB_Mutex::Lock(), which locks a mutex in HALB_IOThread::Entry(void*). HALB_Mutex::Lock() is also called in AudioObjectGetPropertyData, which is called by coreaudio driver. Therefore, a deadlock will occur if coreaudio driver calls AudioObjectGetPropertyData while holding a lock for a mutex and tries to lock the same mutex in AudioDeviceIOProc. audioDeviceIOProc, which implements AudioDeviceIOProc in coreaudio driver, requires an exclusive access for the device configuration and the buffer. Fortunately, a mutex is necessary only for the buffer in audioDeviceIOProc because a change for the device configuration occurs only before setting up AudioDeviceIOProc or after stopping the playback with AudioDeviceStop. With this change, the mutex owned by the driver will only be used for the buffer, and the device configuration change will be protected with the implicit iothread mutex. Signed-off-by: Akihiko Odaki <akihiko.odaki@gmail.com> Message-id: 20210622201740.38005-1-akihiko.odaki@gmail.com Message-Id: <20210622201740.38005-1-akihiko.odaki@gmail.com> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> |
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| .. | ||
| alsaaudio.c | ||
| audio_int.h | ||
| audio_legacy.c | ||
| audio_template.h | ||
| audio_win_int.c | ||
| audio_win_int.h | ||
| audio.c | ||
| audio.h | ||
| coreaudio.c | ||
| dsound_template.h | ||
| dsoundaudio.c | ||
| jackaudio.c | ||
| meson.build | ||
| mixeng_template.h | ||
| mixeng.c | ||
| mixeng.h | ||
| noaudio.c | ||
| ossaudio.c | ||
| paaudio.c | ||
| rate_template.h | ||
| sdlaudio.c | ||
| spiceaudio.c | ||
| trace-events | ||
| trace.h | ||
| wavaudio.c | ||
| wavcapture.c | ||