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audio: Tighten up possession of detectionLock during device open.

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We don't need it for most of the time, and holding it during the backend's
OpenDevice upsets ThreadSanitizer vs our PulseAudio code.

Fixes #7427.
This commit is contained in:
Ryan C. Gordon 2023-11-20 00:07:15 -05:00
parent e51760e111
commit c331b64d79
No known key found for this signature in database
GPG key ID: FA148B892AB48044
1 changed files with 23 additions and 28 deletions
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51
src/audio/SDL_audio.c
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@ -1292,25 +1292,10 @@ static SDL_AudioDeviceID open_audio_device(const char *devname, int iscapture,
return 0;
}
SDL_LockMutex(current_audio.detectionLock);
/* Find an available device ID... */
for (id = min_id - 1; id < SDL_arraysize(open_devices); id++) {
if (open_devices[id] == NULL) {
break;
}
}
if (id == SDL_arraysize(open_devices)) {
SDL_SetError("Too many open audio devices");
SDL_UnlockMutex(current_audio.detectionLock);
return 0;
}
if (!obtained) {
obtained = &_obtained;
}
if (!prepare_audiospec(desired, obtained)) {
SDL_UnlockMutex(current_audio.detectionLock);
return 0;
}
@ -1332,11 +1317,11 @@ static SDL_AudioDeviceID open_audio_device(const char *devname, int iscapture,
if ((iscapture) && (current_audio.impl.OnlyHasDefaultCaptureDevice)) {
if ((devname) && (SDL_strcmp(devname, DEFAULT_INPUT_DEVNAME) != 0)) {
SDL_SetError("No such device");
SDL_UnlockMutex(current_audio.detectionLock);
return 0;
}
devname = NULL;
SDL_LockMutex(current_audio.detectionLock);
for (i = 0; i < SDL_arraysize(open_devices); i++) {
if ((open_devices[i]) && (open_devices[i]->iscapture)) {
SDL_SetError("Audio device already open");
@ -1344,14 +1329,15 @@ static SDL_AudioDeviceID open_audio_device(const char *devname, int iscapture,
return 0;
}
}
SDL_UnlockMutex(current_audio.detectionLock);
} else if ((!iscapture) && (current_audio.impl.OnlyHasDefaultOutputDevice)) {
if ((devname) && (SDL_strcmp(devname, DEFAULT_OUTPUT_DEVNAME) != 0)) {
SDL_UnlockMutex(current_audio.detectionLock);
SDL_SetError("No such device");
return 0;
}
devname = NULL;
SDL_LockMutex(current_audio.detectionLock);
for (i = 0; i < SDL_arraysize(open_devices); i++) {
if ((open_devices[i]) && (!open_devices[i]->iscapture)) {
SDL_UnlockMutex(current_audio.detectionLock);
@ -1359,6 +1345,7 @@ static SDL_AudioDeviceID open_audio_device(const char *devname, int iscapture,
return 0;
}
}
SDL_UnlockMutex(current_audio.detectionLock);
} else if (devname != NULL) {
/* if the app specifies an exact string, we can pass the backend
an actual device handle thingey, which saves them the effort of
@ -1367,19 +1354,20 @@ static SDL_AudioDeviceID open_audio_device(const char *devname, int iscapture,
It might still need to open a device based on the string for,
say, a network audio server, but this optimizes some cases. */
SDL_AudioDeviceItem *item;
SDL_LockMutex(current_audio.detectionLock);
for (item = iscapture ? current_audio.inputDevices : current_audio.outputDevices; item; item = item->next) {
if ((item->handle != NULL) && (SDL_strcmp(item->name, devname) == 0)) {
handle = item->handle;
break;
}
}
SDL_UnlockMutex(current_audio.detectionLock);
}
if (!current_audio.impl.AllowsArbitraryDeviceNames) {
/* has to be in our device list, or the default device. */
if ((handle == NULL) && (devname != NULL)) {
SDL_SetError("No such device.");
SDL_UnlockMutex(current_audio.detectionLock);
return 0;
}
}
@ -1387,10 +1375,8 @@ static SDL_AudioDeviceID open_audio_device(const char *devname, int iscapture,
device = (SDL_AudioDevice *)SDL_calloc(1, sizeof(SDL_AudioDevice));
if (device == NULL) {
SDL_OutOfMemory();
SDL_UnlockMutex(current_audio.detectionLock);
return 0;
}
device->id = id + 1;
device->spec = *obtained;
device->iscapture = iscapture ? SDL_TRUE : SDL_FALSE;
device->handle = handle;
@ -1404,7 +1390,6 @@ static SDL_AudioDeviceID open_audio_device(const char *devname, int iscapture,
device->mixer_lock = SDL_CreateMutex();
if (device->mixer_lock == NULL) {
close_audio_device(device);
SDL_UnlockMutex(current_audio.detectionLock);
SDL_SetError("Couldn't create mixer lock");
return 0;
}
@ -1419,7 +1404,6 @@ static SDL_AudioDeviceID open_audio_device(const char *devname, int iscapture,
if (current_audio.impl.OpenDevice(device, devname) < 0) {
close_audio_device(device);
SDL_UnlockMutex(current_audio.detectionLock);
return 0;
}
@ -1475,7 +1459,6 @@ static SDL_AudioDeviceID open_audio_device(const char *devname, int iscapture,
if (!device->stream) {
close_audio_device(device);
SDL_UnlockMutex(current_audio.detectionLock);
return 0;
}
}
@ -1485,7 +1468,6 @@ static SDL_AudioDeviceID open_audio_device(const char *devname, int iscapture,
device->buffer_queue = SDL_NewDataQueue(SDL_AUDIOBUFFERQUEUE_PACKETLEN, obtained->size * 2);
if (!device->buffer_queue) {
close_audio_device(device);
SDL_UnlockMutex(current_audio.detectionLock);
SDL_SetError("Couldn't create audio buffer queue");
return 0;
}
@ -1503,12 +1485,28 @@ static SDL_AudioDeviceID open_audio_device(const char *devname, int iscapture,
device->work_buffer = (Uint8 *)SDL_malloc(device->work_buffer_len);
if (device->work_buffer == NULL) {
close_audio_device(device);
SDL_UnlockMutex(current_audio.detectionLock);
SDL_OutOfMemory();
return 0;
}
/* Find an available device ID... */
SDL_LockMutex(current_audio.detectionLock);
for (id = min_id - 1; id < SDL_arraysize(open_devices); id++) {
if (open_devices[id] == NULL) {
break;
}
}
if (id == SDL_arraysize(open_devices)) {
close_audio_device(device);
SDL_SetError("Too many open audio devices");
SDL_UnlockMutex(current_audio.detectionLock);
return 0;
}
device->id = id + 1;
open_devices[id] = device; /* add it to our list of open devices. */
SDL_UnlockMutex(current_audio.detectionLock);
/* Start the audio thread if necessary */
if (!current_audio.impl.ProvidesOwnCallbackThread) {
@ -1521,7 +1519,6 @@ static SDL_AudioDeviceID open_audio_device(const char *devname, int iscapture,
if (!startup_data.startup_semaphore) {
close_audio_device(device);
SDL_SetError("Couldn't create audio thread startup semaphore");
SDL_UnlockMutex(current_audio.detectionLock);
return 0;
}
@ -1532,14 +1529,12 @@ static SDL_AudioDeviceID open_audio_device(const char *devname, int iscapture,
SDL_DestroySemaphore(startup_data.startup_semaphore);
close_audio_device(device);
SDL_SetError("Couldn't create audio thread");
SDL_UnlockMutex(current_audio.detectionLock);
return 0;
}
SDL_SemWait(startup_data.startup_semaphore);
SDL_DestroySemaphore(startup_data.startup_semaphore);
}
SDL_UnlockMutex(current_audio.detectionLock);
return device->id;
}