vc 多线程处理临界数据，

最新推荐文章于 2019-10-17 17:16:43 发布

原创最新推荐文章于 2019-10-17 17:16:43 发布 · 280 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#多线程添加互斥区

C++ 专栏收录该内容

38 篇文章

订阅专栏

本文展示了如何在VC中使用多线程处理临界数据，通过创建线程并利用互斥量（Mutex）和关键段（CRITICAL_SECTION）来确保线程安全。示例代码中创建了四个线程，并在`sumSub`函数中使用关键段来减小共享变量`sum`，防止数据竞争。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

#include <iostream>
#include <Windows.h>
using namespace std;
int sum = 100;
DWORD WINAPI threadfun(LPVOID lpParameter);
int temp =1;
HANDLE m_mutex;
HANDLE handle1;
HANDLE handle2;
HANDLE handle3;
HANDLE handle4;
CRITICAL_SECTION g_cs;
int main()
{
   char pmsg1[10] = "hello_1\n";
   char pmsg2[10] = "hello_2\n";
   char pmsg3[10] = "hello_3\n";
   char pmsg4[10] = "hello_4\n";
   // m_mutex = ::CreateMutex(NULL, FALSE, NULL);
   // if(!m_mutex)cout<<"CreateMutex fail"<<endl;
   handle1 = CreateThread(NULL,0,threadfun,(void*)pmsg1,0,NULL);
   handle2 = CreateThread(NULL,0,threadfun,(void*)pmsg1,0,NULL);
   handle3 = CreateThread(NULL,0,threadfun,(void*)pmsg1,0,NULL);
   handle4 = CreateThread(NULL,0,threadfun,(void*)pmsg1,0,NULL);

   CloseHandle(handle1);
   CloseHandle(handle2);
   CloseHandle(handle3);
   CloseHandle(handle4);
//   ::CloseHandle(m_mutex);

getchar();
return 0;
}

void sumSub()
{
       InitializeCriticalSection(&g_cs);
       Sleep(2);
   while(sum > 0)
   {
       EnterCriticalSection(&g_cs);
       cout << "tid: " << GetCurrentThreadId() << "\tsum: " << sum-- << endl;
       LeaveCriticalSection(&g_cs);
       Sleep(3);

   }

}
DWORD WINAPI threadfun(LPVOID lpParameter)
{
/*char* pmsg = (char*)lpParameter;
cout<<pmsg;*/

sumSub();
return 0;
}