Fix a deadlock when starting a device fails.

Public issue https://github.com/mackron/miniaudio/issues/399

CHANGES.md

@@ -1,6 +1,7 @@
 v0.11.5 - TBD
 =============
 * Support has been added for automatic stream routing with the AAudio backend.
+* A bug has been fixed that results in a deadlock when starting a device.
 
 
 ---------------------------------------------------------------------------------------------------

miniaudio.h

@@ -39062,13 +39062,18 @@ static ma_thread_result MA_THREADCALL ma_worker_thread(void* pData)
             startResult = MA_SUCCESS;
         }
 
+        /*
+        If starting was not successful we'll need to loop back to the start and wait for something
+        to happen (pDevice->wakeupEvent).
+        */
         if (startResult != MA_SUCCESS) {
             pDevice->workResult = startResult;
-            continue;   /* Failed to start. Loop back to the start and wait for something to happen (pDevice->wakeupEvent). */
+            ma_event_signal(&pDevice->startEvent);  /* <-- Always signal the start event so ma_device_start() can return as it'll be waiting on it. */
+            continue;
         }
 
         /* Make sure the state is set appropriately. */
-        ma_device__set_state(pDevice, ma_device_state_started);
+        ma_device__set_state(pDevice, ma_device_state_started); /* <-- Set this before signaling the event so that the state is always guaranteed to be good after ma_device_start() has returned. */
         ma_event_signal(&pDevice->startEvent);
 
         ma_device__on_notification_started(pDevice);