Critical Sections並不是核心對象。因此沒有handle這樣的東西。它和核心對象不同，它存在於進程的內存空間中。你不需要使用想“Create”這樣的API函數獲得一個critical section handle。你應該做的是將一個類型爲CRITICAL_SECTION的局部變量初始化，方法是調用InitializeCriticalSection():
The InitializeCriticalSection function initializes a critical section object.
VOID InitializeCriticalSection(
LPCRITICAL_SECTION lpCriticalSection // address of critical section object
);
Parameters
lpCriticalSection
Points to the critical section object.
Return Values
This function does not return a value.
當你用畢critical section時，你必須調用DeleteCriticalSection()清除它。這個函數並沒有“釋放對象”的意義在裏頭，不要把它和C++的delete運算符混淆了。
The DeleteCriticalSection function releases all resources used by an unowned critical section object.
VOID DeleteCriticalSection(
LPCRITICAL_SECTION lpCriticalSection // pointer to critical section object
);
Parameters
lpCriticalSection
Points to the critical section object.
Return Values
This function does not return a value.
一旦critical section被初始化，每一個線程就可以進入其中——只要他通過了EnterCriticalSection()這一關：
The EnterCriticalSection function waits for ownership of the specified critical section object. The function returns when the calling thread is granted ownership.
VOID EnterCriticalSection(
LPCRITICAL_SECTION lpCriticalSection // pointer to critical section object
);
Parameters
lpCriticalSection
Points to the critical section object.
Return Values
This function does not return a value.
當線程準備好離開critical section的時候，他必須調用LeaveCriticalSection():
The LeaveCriticalSection function releases ownership of the specified critical section object.
VOID LeaveCriticalSection(
LPCRITICAL_SECTION lpCriticalSection // address of critical section object
);
Parameters
lpCriticalSection
Points to the critical section object.
Return Values
This function does not return a value.
下面是一個很簡單的使用例子，只是爲了演示如何使用，沒有其它目的：
#include <stdio.h>
#include <windows.h>
const int numThreads = 3;
//¶¨ÒåÒ»¸öcritical section±äÁ¿
CRITICAL_SECTION gCS;
DWORD WINAPI helloFunc(LPVOID pArg)
{
//½øÈëcritical section
EnterCriticalSection(&gCS);
int num = (int) pArg;
printf("Hello Thread %d/n", num);
//Ïß³ÌÓñϣ¬¼ÇµÃµ÷Óô˺¯ÊıÀ뿪critical section¡££¨Enter**ÓëLeave**µÄÊıÁ¿ÒªÅä¶Ô£©
LeaveCriticalSection(&gCS);
return 0;
}
int main()
{
//³õʼ»¯critical section
InitializeCriticalSection(&gCS);
HANDLE hThread[numThreads];
DWORD begin = GetTickCount();
for (int i = 0; i < numThreads; i++)
{
hThread[i] = CreateThread(NULL, 0, helloFunc, (LPVOID)i, 0, NULL);
}
WaitForMultipleObjects(numThreads, hThread, TRUE, INFINITE);
DWORD elapse = GetTickCount() - begin;
printf("elapse time: %d/n", elapse);
//ËùÓĞÏß³ÌÖ´ĞĞÍê±Ïºó£¬deleteµôcritical section
DeleteCriticalSection(&gCS);
return 0;
}