新浪技术面试题

用两个线程实现1-100之间数的输出

主要关键是实现线程的同步访问，程序用到了事件对象和CreateThread函数。

#include <stdio.h>
#include <windows.h>

int n=0;
HANDLE hEvent;

DWORD WINAPI ThreadFunc(LPVOID lpParam)
{
	WaitForSingleObject(hEvent,INFINITE);//实现互斥访问
	while(n<100)
	{
		Sleep(100);
		n++;
		printf("the count=%d\n",n);
	}
	SetEvent(hEvent);

}

DWORD WINAPI Add(LPVOID lpParam)
{
	WaitForSingleObject(hEvent,INFINITE);
	while(n<100)
	{
		Sleep(100);
		n++;
		printf("the count=%d\n",n);
	}
	SetEvent(hEvent);

}

int main()
{
	HANDLE hThread,hThread1;
	DWORD dwThreadId,dwThreadId1;

	hEvent=CreateEvent(NULL,FALSE,TRUE,NULL);//创建事件对象
	hThread=CreateThread(NULL,NULL,ThreadFunc,NULL,0,&dwThreadId);//创建线程
	hThread1=CreateThread(NULL,NULL,Add,NULL,0,&dwThreadId1);

	printf("the dwThreadId =%d\n",dwThreadId);
	printf("the dwThreadId =%d\n",dwThreadId1);

	WaitForSingleObject(hThread,INFINITE);
	WaitForSingleObject(hThread1,INFINITE);

	CloseHandle(hThread);//关闭线程句柄
	CloseHandle(hThread1);
	return 0;
}