Add some debugging to audioworklet_emscripten_locks.c. NFC (emscripten-core#24203)

I'm having some trouble getting this test to pass in emscripten-core#24190 and even
having trouble getting to pass on my desktop.

Author: sbc100

test/webaudio/audioworklet_emscripten_locks.c

@@ -45,6 +45,7 @@ _Atomic Test whichTest = TEST_HAS_WAIT;
 double startTime = 0;
 
 bool ProcessAudio(int numInputs, const AudioSampleFrame *inputs, int numOutputs, AudioSampleFrame *outputs, int numParams, const AudioParamFrame *params, void *userData) {
+  assert(emscripten_current_thread_is_audio_worklet());
   int result = 0;
   switch (whichTest) {
   case TEST_HAS_WAIT:
@@ -69,7 +70,7 @@ bool ProcessAudio(int numInputs, const AudioSampleFrame *inputs, int numOutputs,
     whichTest = TEST_WAIT_ACQUIRE;
   case TEST_WAIT_ACQUIRE:
     // Will get unlocked in main thread, so should quickly acquire
-    result = emscripten_lock_busyspin_wait_acquire(&testLock, 100);
+    result = emscripten_lock_busyspin_wait_acquire(&testLock, 10000);
     emscripten_outf("TEST_WAIT_ACQUIRE: %d  (expect: 1)", result);
     assert(result);
     whichTest = TEST_RELEASE;
@@ -114,10 +115,16 @@ EM_JS(void, InitHtmlUi, (EMSCRIPTEN_WEBAUDIO_T audioContext), {
 });
 
 bool MainLoop(double time, void* data) {
+  assert(!emscripten_current_thread_is_audio_worklet());
+  static int didUnlock = false;
   switch (whichTest) {
   case TEST_WAIT_ACQUIRE:
-    // Release here to acquire in process
-    emscripten_lock_release(&testLock);
+    if (!didUnlock) {
+      emscripten_out("main thread releasing lock");
+      // Release here to acquire in process
+      emscripten_lock_release(&testLock);
+      didUnlock = true;
+    }
     break;
   case TEST_WAIT_INFINTE_1:
     // Spin here until released in process (but don't change test until we know this case ran)