Another potential fix for a data race error with PulseAudio.

Public issue https://github.com/mackron/miniaudio/issues/235

miniaudio.h

@@ -22810,9 +22810,11 @@ static ma_result ma_context_init__pulse(const ma_context_config* pConfig, ma_con
         return result;
     }
 
-    pContext->pulse.pPulseContext = ((ma_pa_context_new_proc)pContext->pulse.pa_context_new)(((ma_pa_threaded_mainloop_get_api_proc)pContext->pulse.pa_threaded_mainloop_get_api)((ma_pa_threaded_mainloop*)pContext->pulse.pMainLoop), pConfig->pulse.pApplicationName);
-    if (pContext->pulse.pPulseContext == NULL) {
-        result = ma_context_post_error(pContext, NULL, MA_LOG_LEVEL_ERROR, "[PulseAudio] Failed to create PulseAudio context.", MA_FAILED_TO_INIT_BACKEND);
+    /* With the mainloop created we can now start it. */
+    result = ma_result_from_pulse(((ma_pa_threaded_mainloop_start_proc)pContext->pulse.pa_threaded_mainloop_start)((ma_pa_threaded_mainloop*)pContext->pulse.pMainLoop));
+    if (result != MA_SUCCESS) {
+        ma_context_post_error(pContext, NULL, MA_LOG_LEVEL_ERROR, "[PulseAudio] Failed to start mainloop.", result);
+        ((ma_pa_context_unref_proc)pContext->pulse.pa_context_unref)((ma_pa_context*)pContext->pulse.pPulseContext);
         ((ma_pa_threaded_mainloop_free_proc)pContext->pulse.pa_threaded_mainloop_free)((ma_pa_threaded_mainloop*)(pContext->pulse.pMainLoop));
     #ifndef MA_NO_RUNTIME_LINKING
         ma_dlclose(pContext, pContext->pulse.pulseSO);
@@ -22820,10 +22822,12 @@ static ma_result ma_context_init__pulse(const ma_context_config* pConfig, ma_con
         return result;
     }
 
-    /* Now we need to connect to the context. Everything is asynchronous so we need to wait for it to connect before returning. */
-    result = ma_result_from_pulse(((ma_pa_context_connect_proc)pContext->pulse.pa_context_connect)((ma_pa_context*)pContext->pulse.pPulseContext, pConfig->pulse.pServerName, (pConfig->pulse.tryAutoSpawn) ? 0 : MA_PA_CONTEXT_NOAUTOSPAWN, NULL));
-    if (result != MA_SUCCESS) {
-        ma_context_post_error(pContext, NULL, MA_LOG_LEVEL_ERROR, "[PulseAudio] Failed to connect PulseAudio context.", result);
+    ma_mainloop_lock__pulse(pContext, "ma_context_init__pulse");
+    pContext->pulse.pPulseContext = ((ma_pa_context_new_proc)pContext->pulse.pa_context_new)(((ma_pa_threaded_mainloop_get_api_proc)pContext->pulse.pa_threaded_mainloop_get_api)((ma_pa_threaded_mainloop*)pContext->pulse.pMainLoop), pConfig->pulse.pApplicationName);
+    ma_mainloop_unlock__pulse(pContext, "ma_context_init__pulse");
+    if (pContext->pulse.pPulseContext == NULL) {
+        result = ma_context_post_error(pContext, NULL, MA_LOG_LEVEL_ERROR, "[PulseAudio] Failed to create PulseAudio context.", MA_FAILED_TO_INIT_BACKEND);
+        ((ma_pa_threaded_mainloop_stop_proc)pContext->pulse.pa_threaded_mainloop_stop)((ma_pa_threaded_mainloop*)(pContext->pulse.pMainLoop));
         ((ma_pa_threaded_mainloop_free_proc)pContext->pulse.pa_threaded_mainloop_free)((ma_pa_threaded_mainloop*)(pContext->pulse.pMainLoop));
     #ifndef MA_NO_RUNTIME_LINKING
         ma_dlclose(pContext, pContext->pulse.pulseSO);
@@ -22831,11 +22835,13 @@ static ma_result ma_context_init__pulse(const ma_context_config* pConfig, ma_con
         return result;
     }
 
-    /* We now need to start the mainloop. Once the loop has started we can then wait for the PulseAudio context to connect. */
-    result = ma_result_from_pulse(((ma_pa_threaded_mainloop_start_proc)pContext->pulse.pa_threaded_mainloop_start)((ma_pa_threaded_mainloop*)pContext->pulse.pMainLoop));
+    /* Now we need to connect to the context. Everything is asynchronous so we need to wait for it to connect before returning. */
+    ma_mainloop_lock__pulse(pContext, "ma_context_init__pulse");
+    result = ma_result_from_pulse(((ma_pa_context_connect_proc)pContext->pulse.pa_context_connect)((ma_pa_context*)pContext->pulse.pPulseContext, pConfig->pulse.pServerName, (pConfig->pulse.tryAutoSpawn) ? 0 : MA_PA_CONTEXT_NOAUTOSPAWN, NULL));
+    ma_mainloop_unlock__pulse(pContext, "ma_context_init__pulse");
     if (result != MA_SUCCESS) {
-        ma_context_post_error(pContext, NULL, MA_LOG_LEVEL_ERROR, "[PulseAudio] Failed to start mainloop.", result);
-        ((ma_pa_context_unref_proc)pContext->pulse.pa_context_unref)((ma_pa_context*)pContext->pulse.pPulseContext);
+        ma_context_post_error(pContext, NULL, MA_LOG_LEVEL_ERROR, "[PulseAudio] Failed to connect PulseAudio context.", result);
+        ((ma_pa_threaded_mainloop_stop_proc)pContext->pulse.pa_threaded_mainloop_stop)((ma_pa_threaded_mainloop*)(pContext->pulse.pMainLoop));
         ((ma_pa_threaded_mainloop_free_proc)pContext->pulse.pa_threaded_mainloop_free)((ma_pa_threaded_mainloop*)(pContext->pulse.pMainLoop));
     #ifndef MA_NO_RUNTIME_LINKING
         ma_dlclose(pContext, pContext->pulse.pulseSO);
@@ -22843,6 +22849,7 @@ static ma_result ma_context_init__pulse(const ma_context_config* pConfig, ma_con
         return result;
     }
 
+    /* Since ma_context_init() runs synchronously we need to wait for the PulseAudio context to connect before we return. */
     result = ma_context_wait_for_pa_context_to_connect__pulse(pContext);
     if (result != MA_SUCCESS) {
         ((ma_pa_threaded_mainloop_stop_proc)pContext->pulse.pa_threaded_mainloop_stop)((ma_pa_threaded_mainloop*)(pContext->pulse.pMainLoop));