swift中pthread_t之mutex

mutex类型有四种

• PTHREAD_MUTEX_NORMAL
• PTHREAD_MUTEX_ERRORCHECK
• PTHREAD_MUTEX_RECURSIVE
• PTHREAD_MUTEX_DEFAULT

1.mutex初始化。

     var mutex = pthread_mutex_t()
     var attr: pthread_mutexattr_t = pthread_mutexattr_t()
     pthread_mutexattr_init(&attr)
     pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE)
     pthread_mutex_init(&mutex, &attr)

2.mutex使用。

     pthread_mutex_trylock(&mutex)
        //执行代码块
     pthread_mutex_unlock(&mutex)

3.mutex释放。

    pthread_mutex_destroy(&mutex)