互斥量

HANDLE CreateMutex(  LPSECURITY_ATTRIBUTES lpMutexAttributes,  BOOL bInitialOwner,  LPCTSTR lpName);
1：lpMutexAttributes应该设为NULL
2：bInitialOwner指定调用线程是否立刻拥有刚刚创建线程的互斥量的所有权
3：lpName在调用CreateMutex时检查是否有相同名称的互斥量已经创建，如果已经创建，则返回已经创建的互斥量的句柄。为确定互斥量是否存在
   需要调用GetLastError，如果它返回ERROR_ALREADY_EXISTS，则表示该互斥量已存在，那么即使上面的bInitialOwner设置为TRUE也不能
   无法立刻拥有该互斥量
调用WaitForSingleObject将获取互斥量，ReleaseMutex将释放互斥量，注意调用WaitForSingleObject和ReleaseMutex的次数必须相等
线程MyThread1和Mythread2将交替打印i的值
// MyThread.cpp : Defines the entry point for the console application.
//
 
#include "stdafx.h"
#include <windows.h>
#include <commctrl.h>
 
HANDLE hMutex;
 
DWORD MyThread1(VOID)
{
     INT32 i = 0;
 
     while(1) {
         WaitForSingleObject(hMutex, INFINITE);
         printf("1:%d/n",i++);
         ReleaseMutex(hMutex);
     }
 
     return 0;
}
 
DWORD MyThread2(VOID)
{
     INT32 i = 0;
 
     while(1) {
         WaitForSingleObject(hMutex, INFINITE);
         printf("2:%d/n",i++);
         ReleaseMutex(hMutex);
     }
 
     return 0;
}
 
int _tmain(int argc, _TCHAR* argv[])
{
     HANDLE hThread1;
     HANDLE hThread2;
 
     hMutex = CreateMutex(NULL,FALSE,NULL);
     if(NULL == hMutex) {
         printf("Create hMutex error/n");
         return -1;
     }
 
     hThread1 = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)MyThread1, NULL, 0, NULL);
     if(hThread1)  {
         printf("CreateThread MyThread1 success/r/n");
     }    else {
         printf("CreateThread MyThread1 error/r/n");
         return -1;
     }    
 
     hThread2 = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)MyThread2, NULL, 0, NULL);
     if(hThread2)  {
         printf("CreateThread MyThread2 success/r/n");
     }    else {
         printf("CreateThread MyThread2 error/r/n");
         return -1;
     }
     
     while(1) {
         Sleep(1000);
     }
     
 
     CloseHandle(hThread1);
     CloseHandle(hThread2);
 
     return 0;
}