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Fixed potential hang in joystick close if the rumble thread is blocked for some reason

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It's still possible to hang when shutting down, if the rumble thread is still hung, but it won't block indefinitely at runtime.
This commit is contained in:
Sam Lantinga 2020-12-07 09:38:21 -08:00
parent 3c68051eaf
commit c9723c407f
2 changed files with 29 additions and 10 deletions
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17
src/joystick/hidapi/SDL_hidapi_rumble.c
View File

@ -90,6 +90,8 @@ static int SDL_HIDAPI_RumbleThread(void *data)
static void static void
SDL_HIDAPI_StopRumbleThread(SDL_HIDAPI_RumbleContext *ctx) SDL_HIDAPI_StopRumbleThread(SDL_HIDAPI_RumbleContext *ctx)
{ {
SDL_HIDAPI_RumbleRequest *request;
SDL_AtomicSet(&ctx->running, SDL_FALSE); SDL_AtomicSet(&ctx->running, SDL_FALSE);
if (ctx->thread) { if (ctx->thread) {
@ -100,9 +102,18 @@ SDL_HIDAPI_StopRumbleThread(SDL_HIDAPI_RumbleContext *ctx)
ctx->thread = NULL; ctx->thread = NULL;
} }
/* This should always be called with an empty queue */ SDL_LockMutex(ctx->lock);
SDL_assert(!ctx->requests_head); while (ctx->requests_tail) {
SDL_assert(!ctx->requests_tail); request = ctx->requests_tail;
if (request == ctx->requests_head) {
ctx->requests_head = NULL;
}
ctx->requests_tail = request->prev;
(void)SDL_AtomicDecRef(&request->device->rumble_pending);
SDL_free(request);
}
SDL_UnlockMutex(ctx->lock);
if (ctx->request_sem) { if (ctx->request_sem) {
SDL_DestroySemaphore(ctx->request_sem); SDL_DestroySemaphore(ctx->request_sem);

18
src/joystick/hidapi/SDL_hidapijoystick.c
View File

@ -833,6 +833,11 @@ HIDAPI_DelDevice(SDL_HIDAPI_Device *device)
HIDAPI_CleanupDeviceDriver(device); HIDAPI_CleanupDeviceDriver(device);
/* Make sure the rumble thread is done with this device */
while (SDL_AtomicGet(&device->rumble_pending) > 0) {
SDL_Delay(10);
}
SDL_DestroyMutex(device->dev_lock); SDL_DestroyMutex(device->dev_lock);
SDL_free(device->serial); SDL_free(device->serial);
SDL_free(device->name); SDL_free(device->name);
@ -1193,11 +1198,14 @@ HIDAPI_JoystickClose(SDL_Joystick * joystick)
{ {
if (joystick->hwdata) { if (joystick->hwdata) {
SDL_HIDAPI_Device *device = joystick->hwdata->device; SDL_HIDAPI_Device *device = joystick->hwdata->device;
int i;
/* Wait for pending rumble to complete */ /* Wait up to 30 ms for pending rumble to complete */
for (i = 0; i < 3; ++i) {
while (SDL_AtomicGet(&device->rumble_pending) > 0) { while (SDL_AtomicGet(&device->rumble_pending) > 0) {
SDL_Delay(10); SDL_Delay(10);
} }
}
device->driver->CloseJoystick(device, joystick); device->driver->CloseJoystick(device, joystick);
@ -1215,11 +1223,14 @@ HIDAPI_JoystickQuit(void)
HIDAPI_ShutdownDiscovery(); HIDAPI_ShutdownDiscovery();
SDL_HIDAPI_QuitRumble();
while (SDL_HIDAPI_devices) { while (SDL_HIDAPI_devices) {
HIDAPI_DelDevice(SDL_HIDAPI_devices); HIDAPI_DelDevice(SDL_HIDAPI_devices);
} }
SDL_HIDAPI_QuitRumble(); /* Make sure the drivers cleaned up properly */
SDL_assert(SDL_HIDAPI_numjoysticks == 0);
for (i = 0; i < SDL_arraysize(SDL_HIDAPI_drivers); ++i) { for (i = 0; i < SDL_arraysize(SDL_HIDAPI_drivers); ++i) {
SDL_HIDAPI_DeviceDriver *driver = SDL_HIDAPI_drivers[i]; SDL_HIDAPI_DeviceDriver *driver = SDL_HIDAPI_drivers[i];
@ -1230,9 +1241,6 @@ HIDAPI_JoystickQuit(void)
hid_exit(); hid_exit();
/* Make sure the drivers cleaned up properly */
SDL_assert(SDL_HIDAPI_numjoysticks == 0);
shutting_down = SDL_FALSE; shutting_down = SDL_FALSE;
initialized = SDL_FALSE; initialized = SDL_FALSE;
} }