VC 线程同步临界区

最新推荐文章于 2017-07-25 18:12:48 发布

原创最新推荐文章于 2017-07-25 18:12:48 发布 · 1.3k 阅读

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2.临界区也可叫关键代码段。

InitializeCriticalSection: 初始化临界区

EnterCriticalSection : 获取进入临界区的所以权。该函数等待指定的临界区对象的所有权。

LeaveCriticalSection : 离开临界区

DeleteCriticalSection : 删除临界区

CRITICAL_SECTION g_cs;

InitializeCriticalSection(&g_cs); //参数是个out型的，即返回值类型，自己定义好后，系统帮你填充。

代码实例摘自孙鑫老师：

代码有些疑惑当把：cout<<"thread1 is running!"<<endl;注释起来后就会发现只有thread2在运行。

#include <windows.h>
#include <iostream.h>

DWORD WINAPI Fun1Proc(
LPVOID lpParameter // thread data
);

DWORD WINAPI Fun2Proc(
LPVOID lpParameter // thread data
);

int tickets=100;

//CRITICAL_SECTION g_csA;
//CRITICAL_SECTION g_csB;
CRITICAL_SECTION g_cs;

void main()
{
HANDLE hThread1;
HANDLE hThread2;
hThread1=CreateThread(NULL,0,Fun1Proc,NULL,0,NULL);
hThread2=CreateThread(NULL,0,Fun2Proc,NULL,0,NULL);
CloseHandle(hThread1);
CloseHandle(hThread2);

InitializeCriticalSection(&g_cs);
Sleep(4000);
DeleteCriticalSection(&g_cs);

}

DWORD WINAPI Fun1Proc(
LPVOID lpParameter   // thread data
)
{
while(TRUE)
{
     EnterCriticalSection(&g_cs);
  Sleep(1);
  if(tickets>0)
  {
   Sleep(1);
   cout<<"thread1 sell ticket : "<<tickets--<<endl;
      LeaveCriticalSection(&g_cs);
  }
  else
  {
   LeaveCriticalSection(&g_cs);
   break;
  }
}
cout<<"thread1 is running!"<<endl;
return 0;
}

DWORD WINAPI Fun2Proc(
LPVOID lpParameter   // thread data
)
{

while(TRUE)
{
  EnterCriticalSection(&g_cs);
  Sleep(1);
  if(tickets>0)
  {
   Sleep(1);
   cout<<"thread2 sell ticket : "<<tickets--<<endl;
   LeaveCriticalSection(&g_cs);
  }
  else
  {
   LeaveCriticalSection(&g_cs);
   break;
  }
}
cout<<"thread2 is running!"<<endl;
return 0;
}