三个线程交替数数 数到100

#include "stdafx.h"  

#include <windows.h>  
#include <process.h>  
using namespace std;  


HANDLE hSemaphoreA;
HANDLE hSemaphoreB;
HANDLE hSemaphoreC;

int num=0;


unsigned int __stdcall FunA(LPVOID p)
{
	while(num<99)
	{
		WaitForSingleObject(hSemaphoreA,INFINITE);
		printf("A:%d
",num);
		num++;
		ReleaseSemaphore(hSemaphoreB,1,NULL);
	}
	return 0;

}

unsigned int __stdcall FunB(LPVOID p)
{
	while(num<99)
	{
		WaitForSingleObject(hSemaphoreB,INFINITE);
		printf("B:%d
",num);
		num++;
		ReleaseSemaphore(hSemaphoreC,1,NULL);
	}
	return 0;
}

unsigned int __stdcall FunC(LPVOID p)
{
	while(num<99)
	{
		WaitForSingleObject(hSemaphoreC,INFINITE);
		printf("C:%d
",num);
		num++;
		ReleaseSemaphore(hSemaphoreA,1,NULL);
	}
	return 0;
}
void main()
{
	HANDLE hThread[3];
	hSemaphoreA=CreateSemaphore(NULL,1,1,NULL);
	hSemaphoreB=CreateSemaphore(NULL,0,1,NULL);
	hSemaphoreC=CreateSemaphore(NULL,0,1,NULL);


	hThread[0]=(HANDLE)_beginthreadex(NULL,0,FunA,NULL,0,0);
	hThread[1]=(HANDLE)_beginthreadex(NULL,0,FunB,NULL,0,0);
	hThread[2]=(HANDLE)_beginthreadex(NULL,0,FunC,NULL,0,0);
	WaitForMultipleObjects(3,hThread,TRUE,INFINITE);
	for(int i=0;i<3;i++)
	{
		CloseHandle(hThread[i]);
	}
	CloseHandle(hSemaphoreA);
	CloseHandle(hSemaphoreB);
	CloseHandle(hSemaphoreC);
}