Method rqueue

libapp2sys/src/main/cpp/util.h:86–90

public:
    rqueue() {
        sem_init(&_semmax, 0, queuelen ? queuelen : 65535);
        sem_init(&_semcnt, 0, 0);
        pthread_mutex_init(&_mutex, NULL);
    }

    ~rqueue() {
        sem_destroy(&_semmax);