[audioworklet] Fix test_audio_worklet shutdown hang. (#25326)

Author: brendandahl

test/codesize/test_minimal_runtime_code_size_audio_worklet.json

@@ -3,8 +3,8 @@
   "a.html.gz": 357,
   "a.js": 4077,
   "a.js.gz": 2137,
-  "a.wasm": 1298,
-  "a.wasm.gz": 868,
-  "total": 5894,
-  "total_gz": 3362
+  "a.wasm": 1308,
+  "a.wasm.gz": 876,
+  "total": 5904,
+  "total_gz": 3370
 }

test/webaudio/audioworklet.c

@@ -20,6 +20,8 @@
      begin to fire.
 */
 
+EMSCRIPTEN_WEBAUDIO_T context;
+
 // TEST_AND_EXIT is defined when running in the Emscripten test harness. You can
 // strip these out in your own project (otherwise playback will end quickly).
 #ifdef TEST_AND_EXIT
@@ -70,6 +72,7 @@ bool main_thread_tls_access(double time, void *userData) {
   testTlsVariable = (int)time;
   // Exit to the test harness after enough calls to ProcessAudio()
   if (lastTlsVariableValueInAudioThread >= 100) {
+    emscripten_destroy_audio_context(context);
     emscripten_force_exit(0);
   }
   return true;
@@ -128,7 +131,7 @@ int main() {
   assert(!emscripten_current_thread_is_audio_worklet());
 
   // Create an audio context
-  EMSCRIPTEN_WEBAUDIO_T context = emscripten_create_audio_context(0 /* use default constructor options */);
+  context = emscripten_create_audio_context(0 /* use default constructor options */);
 
   // and kick off Audio Worklet scope initialization, which shares the Wasm
   // Module and Memory to the AudioWorklet scope and initializes its stack.