Function ThreadLoop

libraries/webp/src/utils/thread_utils.c:204–228

//------------------------------------------------------------------------------

static THREADFN ThreadLoop(void* ptr) {
  WebPWorker* const worker = (WebPWorker*)ptr;
  WebPWorkerImpl* const impl = (WebPWorkerImpl*)worker->impl_;
  int done = 0;
  while (!done) {
    pthread_mutex_lock(&impl->mutex_);
    while (worker->status_ == OK) {   // wait in idling mode
      pthread_cond_wait(&impl->condition_, &impl->mutex_);
    }
    if (worker->status_ == WORK) {
      WebPGetWorkerInterface()->Execute(worker);
      worker->status_ = OK;
    } else if (worker->status_ == NOT_OK) {   // finish the worker
      done = 1;
    }
    // signal to the main thread that we're done (for Sync())
    // Note the associated mutex does not need to be held when signaling the
    // condition. Unlocking the mutex first may improve performance in some
    // implementations, avoiding the case where the waiting thread can't
    // reacquire the mutex when woken.
    pthread_mutex_unlock(&impl->mutex_);
    pthread_cond_signal(&impl->condition_);
  }
  return THREAD_RETURN(NULL);    // Thread is finished
}

// main thread state control
static void ChangeState(WebPWorker* const worker, WebPWorkerStatus new_status) {