Method pop

libapp2sys/src/main/cpp/util.h:106–114

    }

    T pop() {
        sem_wait(&_semcnt);
        pthread_mutex_lock(&_mutex);
        T obj = _q.front();
        _q.pop_front();
        pthread_mutex_unlock(&_mutex);
        sem_post(&_semmax);
        return obj;
    }

    T front() {
        pthread_mutex_lock(&_mutex);