Method SimuFutex

src/bthread/sys_futex.cpp:34–38

class SimuFutex {
public:
    SimuFutex() : counts(0)
                , ref(0) {
        pthread_mutex_init(&lock, NULL);
        pthread_cond_init(&cond, NULL);
    }
    ~SimuFutex() {
        pthread_mutex_destroy(&lock);
        pthread_cond_destroy(&cond);