mutex 用法_createthread函数用法_releasemutex函数(2)

二 API

Mutex function Description CreateMutexCreates or opens a named or unnamed mutex object. CreateMutexExCreates or opens a named or unnamed mutex object and returns ahandle to the object. OpenMutexOpens an existing named mutex object. ReleaseMutexReleases ownership of the specified mutex object.

三 实例

来自msdn的实例：程函数中有一个循环，在每个循环的开始都取得Mutex，然后对全局或静态操作，相当于在关键代码段操作，然后在使用完以后释放它，大家可以执行，查看结果。

#include<windows.h>

#include<stdio.h>

#defineTHREADCOUNT 64 //less than 64

HANDLEghMutex;

int g_x =0;

DWORD WINAPIWriteToDatabase(LPVOID);

voidmain()

{

HANDLEaThread[THREADCOUNT];

DWORDThreadID;

inti;

//Create a mutex with no initial owner

ghMutex = CreateMutex(

NULL,// default security attributes

FALSE,// initially not owned

NULL);// unnamed mutex

if(ghMutex == NULL)

{

printf('CreateMutex error: %d\n', GetLastError());

return;

}

//Create worker threads

for(i=0; i < THREADCOUNT; i++ )

{

aThread[i] = CreateThread(

NULL,// default security attributes

0, //default stack size

(LPTHREAD_START_ROUTINE) WriteToDatabase,

NULL,// no thread function arguments

0, //default creation flags

&ThreadID); // receive thread identifier

if(aThread[i] == NULL )

{

printf('CreateThread error: %d\n', GetLastError());

return;

}

}

//Wait for all threads to terminate

WaitForMultipleObjects(THREADCOUNT, aThread, TRUE, INFINITE);

//Close thread and mutex handles

for(i=0; i < THREADCOUNT; i++ )

CloseHandle(aThread[i]);

CloseHandle(ghMutex);

printf('g_x is :%d\n',g_x);

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