Function set_status_conditional

system/lib/pthread/thread_profiler.c:32–49

Sets the current thread status, but only if it was in the given expected state before. This is used to allow high-level control flow "override" the thread status before low-level (futex wait) operations set it.

// state before. This is used to allow high-level control flow "override" the
// thread status before low-level (futex wait) operations set it.
static void set_status_conditional(int expectedStatus, int newStatus) {
  if (!enabled) {
    return;
  }
  pthread_t thread = pthread_self();
  if (!thread) return; // AudioWorklets do not have a pthread block, but if user calls emscripten_futex_wait() in an AudioWorklet, it will call here via emscripten_set_current_thread_status().
  int prevStatus = thread->profilerBlock->threadStatus;

  if (prevStatus != newStatus && (prevStatus == expectedStatus || expectedStatus == -1)) {
    double now = emscripten_get_now();
    double startState = thread->profilerBlock->currentStatusStartTime;
    double duration = now - startState;

    thread->profilerBlock->timeSpentInStatus[prevStatus] += duration;
    thread->profilerBlock->threadStatus = newStatus;
    thread->profilerBlock->currentStatusStartTime = now;
  }
}

void emscripten_conditional_set_current_thread_status(int expectedStatus, int newStatus) {
  set_status_conditional(expectedStatus, newStatus);