[C/C++/信号量]最近看到一个信号量互斥机制的实现，请教其原理

[diaoni]

请高手解释一下，这里是怎样做到互斥的？

typedef int _glthread_Mutex; 
#define _glthread_DECLARE_STATIC_MUTEX(name) static _glthread_Mutex name = 0 
#define _glthread_LOCK_MUTEX(name) (void) name 
#define _glthread_UNLOCK_MUTEX(name) (void) name 
_glthread_DECLARE_STATIC_MUTEX(OneTimeLock); 
static void one_time_init() { 
_glthread_LOCK_MUTEX(OneTimeLock); 
// do something...  
_glthread_UNLOCK_MUTEX(OneTimeLock); 
}

[diaoni]

晕，怎么排版成这样了，我把代码版式整理一下

typedef int _glthread_Mutex; 

#define _glthread_DECLARE_STATIC_MUTEX(name) static _glthread_Mutex name = 0 

#define _glthread_LOCK_MUTEX(name) (void) name 

#define _glthread_UNLOCK_MUTEX(name) (void) name 

_glthread_DECLARE_STATIC_MUTEX(OneTimeLock); 

static void one_time_init() { 
    _glthread_LOCK_MUTEX(OneTimeLock); 
    // do something... 
    _glthread_UNLOCK_MUTEX(OneTimeLock); 
}

[rightorwrong]

我也想知道，请高手解答下