16.2.2火车站售票系统模拟程序(CriticalSection)

#include<iostream>
#include<Windows.h>
using namespace std;

DWORD WINAPI ThreadProc1(LPVOID lpParameter);
DWORD WINAPI ThreadProc2(LPVOID lpParameter);

CRITICAL_SECTION CriticalSection;
int tickets = 100;

int main()
{
 InitializeCriticalSection(&CriticalSection);
 HANDLE hThread1 = CreateThread(NULL,0,ThreadProc1,NULL,0,NULL);
 HANDLE hThread2 = CreateThread(NULL,0,ThreadProc2,NULL,0,NULL);

 Sleep(4000);
 DeleteCriticalSection(&CriticalSection);

CloseHandle(hThread1);

CloseHandle(hThread2);

 return 0;
}

DWORD WINAPI ThreadProc1(LPVOID lpParameter)
{
 while(TRUE)
 {
  EnterCriticalSection(&CriticalSection);
  Sleep(1);
  if(tickets > 0)
  {
   Sleep(1);
   cout<<"ThreadProc1 sells "<<tickets--<<endl;
   LeaveCriticalSection(&CriticalSection);
  }
  else
  {
   LeaveCriticalSection(&CriticalSection);
   break;
  }
 }
 return 0;
}

DWORD WINAPI ThreadProc2(LPVOID lpParameter)
{
 while(TRUE)
 {
  EnterCriticalSection(&CriticalSection);
  Sleep(1);
  if(tickets > 0)
  {
   Sleep(1);
   cout<<"ThreadProc2 sells "<<tickets--<<endl;
   LeaveCriticalSection(&CriticalSection);
  }
  else
  {
   LeaveCriticalSection(&CriticalSection);
   break;
  }
 }
 return 0;
}

//临界区要在线程执行前初始化，因为线程一但被建立即开始运行（除非手工挂起），但线程建立后在初始化临界区可能出现问题