C- 一个多线程的例子

网易公开课，一个多线程的例子，VC2010控制台程序测试通过。

//  一个飞机票售票的实现。
//

#include "stdafx.h"

#define AGENTNUM 3
HANDLE hSemaphore;
typedef struct _THREADDATA
{
 int agent;
 int *numTickets;
}*LPTHREADDATA, THREADDATA;
DWORD _stdcall SellTickets(LPVOID lpParameter);

int main(int argc, char* argv[])
{
 int agentnum = AGENTNUM;
 int numTickets = 10;
 HANDLE handle[AGENTNUM];
 hSemaphore = CreateSemaphore(NULL, 1, 1, NULL);
 LPTHREADDATA agentdata = new THREADDATA[AGENTNUM];
 for(int i=0;i<agentnum;i++) {
  agentdata[i].agent = i+1;
  agentdata[i].numTickets = &numTickets;
  handle[i] = CreateThread(NULL, 1,SellTickets, &agentdata[i], 0, NULL);
 }
 WaitForMultipleObjects(AGENTNUM,handle,TRUE,INFINITE);
 delete(agentdata);
 return 0;
}

DWORD _stdcall SellTickets(LPVOID lpParameter)
{
 while(TRUE) {
  WaitForSingleObject(hSemaphore, INFINITE);
  LPTHREADDATA pData = (LPTHREADDATA)lpParameter;
  if(*(pData->numTickets) == 0) break;
  printf("子线程的线程ID号为：%d，售票点：%d,卖出机票编号：%d\n",GetCurrentThreadId(),pData->agent,*(pData->numTickets));
  (*(pData->numTickets)) --;
  ReleaseSemaphore(hSemaphore, 1, NULL);
  if(rand()%3 <= 2 ) Sleep(500);
 }
 ReleaseSemaphore(hSemaphore, 1, NULL);
 return 0;
}