C++中Semaphore内核对象 C++中Semaphore内核对象用法实例

// Semaphore.cpp : 定义控制台应用程序的入口点。 
// 
 
#include "stdafx.h" 
#include <Windows.h> 
#include <process.h>  
 
HANDLE g_hSemaphore; 
DWORD g_nConut1 = 0; 
DWORD g_nConut2 = 0; 
unsigned __stdcall ThreadProc1( void* pArguments ) 
{ 
    ::WaitForSingleObject(g_hSemaphore, INFINITE); 
    for (int i=0;i<10000;i++) 
    { 
        g_nConut1++; 
        g_nConut2++; 
    } 
    ::ReleaseSemaphore(g_hSemaphore, 1, NULL); 
    printf("ThreadProc1\n"); 
    return 0; 
} 
 
unsigned __stdcall ThreadProc2( void* pArguments ) 
{ 
    ::WaitForSingleObject(g_hSemaphore, INFINITE); 
    for (int i=0;i<10000;i++) 
    { 
        g_nConut1++; 
        g_nConut2++; 
    } 
    ::ReleaseSemaphore(g_hSemaphore, 1, NULL); 
    printf("ThreadProc2\n"); 
    return 0; 
} 
 
unsigned __stdcall ThreadProc3( void* pArguments ) 
{ 
    ::WaitForSingleObject(g_hSemaphore, INFINITE); 
    for (int i=0;i<10000;i++) 
    { 
        g_nConut1++; 
        g_nConut2++; 
    } 
    ::ReleaseSemaphore(g_hSemaphore, 1, NULL); 
    printf("ThreadProc3\n"); 
    return 0; 
} 
int _tmain(int argc, _TCHAR* argv[]) 
{ 
    g_hSemaphore = ::CreateSemaphore(NULL, 2, 2, NULL); 
    HANDLE hThread[3]; 
    hThread[0] = (HANDLE)::_beginthreadex(NULL, 0, ThreadProc1, NULL, 0, NULL); 
    hThread[1] = (HANDLE)::_beginthreadex(NULL, 0, ThreadProc2, NULL, 0, NULL); 
    hThread[2] = (HANDLE)::_beginthreadex(NULL, 0, ThreadProc3, NULL, 0, NULL); 
 
    ::WaitForMultipleObjects(2,hThread,TRUE, INFINITE); 
    printf("g_count1=%d\n", g_nConut1); 
    printf("g_count2=%d\n", g_nConut2); 
    printf("main finished.\n"); 
    return 0; 
}