使用 Critical Section 加锁的一个例子

此处是用 Critical Section lock 来保护 data.handling

　　 EnterCriticalSection(&lock);
    if (data.handling) {
        tick64_t start = get_tick64();
        do {
            SleepConditionVariableCS(&lock_wake, &lock, 10*1000);
            if (!data.handling)
                break;
            if (get_tick64() - start > TIMEOUT) {
                LeaveCriticalSection(&lock);
                return -EBUSY;
            }
        }while(1);
    }

    data.handling = 1;
    LeaveCriticalSection(&ioctl_lock);

　　...

　　if (/* Some condition */) {
        EnterCriticalSection(&lock);
        data.handling = 0;
        SleepConditionVariableCS(&lock_wake);
        LeaveCriticalSection(&lock);
    }