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Clarifying hard-to-understand piece of code.

This commit is contained in:
Ryan C. Gordon 2014-07-22 23:12:21 -04:00
parent 75dacdb99b
commit 987c335551
1 changed files with 18 additions and 6 deletions
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24
src/audio/SDL_audio.c
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@ -205,22 +205,34 @@ SDL_AudioOpenDevice_Default(_THIS, const char *devname, int iscapture)
return -1; return -1;
} }
static SDL_INLINE SDL_bool
is_in_audio_device_thread(SDL_AudioDevice * device)
{
/* The device thread locks the same mutex, but not through the public API.
This check is in case the application, in the audio callback,
tries to lock the thread that we've already locked from the
device thread...just in case we only have non-recursive mutexes. */
if (device->thread && (SDL_ThreadID() == device->threadid)) {
return SDL_TRUE;
}
return SDL_FALSE;
}
static void static void
SDL_AudioLockDevice_Default(SDL_AudioDevice * device) SDL_AudioLockDevice_Default(SDL_AudioDevice * device)
{ {
if (device->thread && (SDL_ThreadID() == device->threadid)) { if (!is_in_audio_device_thread(device)) {
return; SDL_LockMutex(device->mixer_lock);
} }
SDL_LockMutex(device->mixer_lock);
} }
static void static void
SDL_AudioUnlockDevice_Default(SDL_AudioDevice * device) SDL_AudioUnlockDevice_Default(SDL_AudioDevice * device)
{ {
if (device->thread && (SDL_ThreadID() == device->threadid)) { if (!is_in_audio_device_thread(device)) {
return; SDL_UnlockMutex(device->mixer_lock);
} }
SDL_UnlockMutex(device->mixer_lock);
} }