Function async_unlock

libavcodec/pthread_frame.c:171–178

}

static void async_unlock(FrameThreadContext *fctx)
{
    pthread_mutex_lock(&fctx->async_mutex);
    av_assert0(fctx->async_lock);
    fctx->async_lock = 0;
    pthread_cond_broadcast(&fctx->async_cond);
    pthread_mutex_unlock(&fctx->async_mutex);
}

static void thread_set_name(PerThreadContext *p)
{