库初始化 - 调用pthread_once在Win32中的实现 [英] Library initialization -- pthread_once in Win32 implementation

问题描述

我试图让我的图书馆完全线程安全的初始化函数，我无法很容易地找到替代调用pthread_once，这应该很容易解决的问题。我来这个code：

I am trying to make a fully thread-safe initialization function for my library and I couldn't easily find an alternative to pthread_once, which should solve the problem very easily. I've come to this code:

void libInit (void)
{
#ifdef WIN32
    static volatile int initialized = 0;
    static HANDLE mtx;

    if (!initialized)
    {
    	if (!mtx)
    	{
    		HANDLE mymtx;
    		mymtx = CreateMutex(NULL, 0, NULL);
    		if (InterlockedCompareExchangePointer(&mtx, mymtx, NULL) != NULL)
    			CloseHandle(mymtx);
    	}

    	WaitForSingleObject(mtx);
    	if (!initialized)
    	{
    		libInitInternal();
    		initialized = 1;
    	}
    	ReleaseMutex(mtx);
    }
#else
    static pthread_once_t initialized = PTHREAD_ONCE_INIT;

    pthread_once(&initialized, libInitInternal);
#endif
}

的 libInitInternal（）调用导致线程安全的功能，即初始化库。

The libInitInternal() call leads to a thread-unsafe function, that initializes the library.

我想听听你知道一个更好的解决方案是什么我可能做错了，或者是否有任何建议。

I would like to hear any suggestions on what I could be doing wrong or whether you know about a better solution.

推荐答案

我想你想使用的一次性初始化功能。在同步模式，所有线程阻塞，直到第一个线程调用它完成。似乎类似于调用pthread_once（）。

I think you want to use the One-Time Initialization functionality. In synchronous mode, all threads block until the first thread to call it completes. Seems analogous to pthread_once().

有 code这里。

所以你的情况，你会说：

So in your case, you would say:

BOOL CALLBACK CallLibInitInternal(PINIT_ONCE InitOnce, PVOID Parameter, PVOID *lpContex) {
    libInitInternal();
    return TRUE;
}

void libInit() {
#ifdef WIN32
    static INIT_ONCE s_init_once;
    InitOnceExecuteOnce(&s_init_once, CallLibInitInternal, NULL, NULL);
#else
...
#endif
}

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