{color:#DE350B}extract_worker_thread_func(void *arg)

{

	while (1) {

		pthread_mutex_lock(ctxt->mutex);

		...;

		pthread_mutex_lock(&entry->mutex);  //ctxt->mutex-->entry->mutex

		pthread_mutex_unlock(ctxt->mutex);

    ...;

		if (chunk.type == XB_CHUNK_TYPE_EOF) {

			pthread_mutex_lock(ctxt->mutex); // entry->mutex-> ctxt->mutex

			pthread_mutex_unlock(&entry->mutex);

			my_hash_delete(ctxt->filehash, (uchar *) entry);

			pthread_mutex_unlock(ctxt->mutex);

			continue;

		}

    ...;

		pthread_mutex_unlock(&entry->mutex);

	}

}{color}