1. java 锁

http://wiki.jikexueyuan.com/project/java-concurrent/locks-in-java.html

private static final ExecutorService mSingleThreadExecutor = Executors.newSingleThreadExecutor();

public static final Lock mLock = new ReentrantLock();
mLock.lock();
mLock.unlock();

2. C++ 锁

https://blog.csdn.net/primeprime/article/details/79697083
https://www.cnblogs.com/yongdaimi/p/8267335.html

1. mutex

static pthread_mutex_t mutex;
pthread_mutex_init(&mutex, NULL);
pthread_mutex_destroy(&mutex);

pthread_mutex_lock(&mutex);
pthread_mutex_unlock(&mutex);

2. sem

初始化：初始化信号量

static sem_t g_DeviceIDSem;
sem_t* config_GetDeviceIDSem() {
    return &g_DeviceIDSem;
}

sem_t* deviceIDSem = config_GetDeviceIDSem();
sem_init(deviceIDSem, 0, 0);

线程等待：执行到这一步暂停执行

sem_t* deviceIDSem = config_GetDeviceIDSem();
sem_wait(deviceIDSem);

线程释放：让等待的线程继续执行

    sem_t* deviceIDSem = config_GetDeviceIDSem();
    if (deviceIDSem != NULL) {
        sem_post(deviceIDSem);
    }