• 利用消息循环的多线程通讯c++


    程序实现的要求:

    我的程序中有一个主线程,N个工作线程。主线程负责收集数据,然后分派给不同的工作线程去处理。我在程序中使用了PostThreadMessage()来通知相应的线程处理数据,而工作线程使用GetMessage()来进行相应。

    伪代码:

    代码流程如下:  
      CreateThread(main);//主线程;  
      for   (int   i=0;i<10;i++)//假设10个工作线程  
      {  
            CreateThread(work);   //这里同时记录工作线程的ThreadID;    
      }  
      ThreadMain()  
      {  
              if   (条件符合某个线程的要求)  
              {  
                  while(!PostThreadMessage(WorkID,MSG,parm,0))   sleep(0);//投递消息通知给相应的工作线程  
              }  
      }  
      ThreadWork()  
      {  
              while(true)  
              {  
                    iRet   =   GetMessage(msg,NULL,0,0);  
                    {  
                        ......此处省略对iRet的判断  
                        if   (msg.message   =   MY_MSG)  
                        {  
                                进行相应处理。。。  
                        }  
                    }  
              }  
      }  

    编译通过的源代码:

    //---------------------------------------------------------------------------  
      #include   <vcl.h>  
      #pragma   hdrstop  
      #include   <map>  
      #include   <iostream>  
      using   namespace   std;  
      typedef   map<int,DWORD>   value_map;  
      typedef   value_map::value_type   valType;  
      #define   WM_WORK   WM_APP   +   0x100  
      #define   WM_FINISH   WM_APP   +   0x101  
      value_map   *vThreadsIdles;  
      //---------------------------------------------------------------------------  
      #pragma   argsused  
      DWORD   WINAPI   ThreadMain(LPVOID   p);  
      DWORD   WINAPI   ThreadWork(LPVOID   p);  
      HANDLE   hMutex;  
      int   main(int   argc,   char*   argv[])  
      {  
                      value_map   mThreads;  
                      HANDLE   handle;  
                      DWORD   dw;  
                      hMutex   =   CreateMutex(NULL,false,"Sample");  
                      for   (int   iThreadIndex   =   0;   iThreadIndex   <   10;   ++iThreadIndex)  
                      {  
                                      handle   =   CreateThread(NULL,0,ThreadWork,NULL,0,&dw);  
                                      mThreads.insert(valType(iThreadIndex,dw));  
                      }  
                      //主线程;  
                      handle   =   CreateThread(NULL,0,ThreadMain,(LPVOID)&mThreads,0,&dw);  
                      WaitForSingleObject(handle,INFINITE);  
                      CloseHandle(handle);  
                      CloseHandle(hMutex);  
                      return   0;  
      }  
      //---------------------------------------------------------------------------  
      DWORD   WINAPI   ThreadMain(LPVOID   p)  
      {  
                      TDateTime   dtNow;  
                      vThreadsIdles   =   (value_map   *)p;  
                      int   iSecond;  
                      MSG   msg;  
                      int   iRet;  
                      bool   blPostTM;  
                      value_map::iterator   iter;  
                      cout   <<   "Start"   <<   endl;  
                      DWORD   dThread;  
                      int   iID;  
                      while(true)  
                      {  
                                      dtNow   =   Date().CurrentDateTime();  
                                      //当前时间秒数小于30时执行  
                                      if(dtNow.FormatString("ss").ToInt()   <   30)  
                                      {  
                                                      iSecond   =   1000;  
                                                      //得到可用处理线程  
                                                      try  
                                                      {  
                                                                    WaitForSingleObject(hMutex,INFINITE);  
                                                                    if(   0   ==   vThreadsIdles->size())  
                                                                    {  
                                                                              continue;  
                                                                    }  
                                                                    //MAP中是后进先出  
                                                                    iter   =   vThreadsIdles->end();  
                                                                    --iter;  
                                                                    dThread   =     (*iter).second;  
                                                                    iID   =   (*iter).first;  
                                                                    vThreadsIdles->erase(iID);  
                                                      }  
                                                      __finally  
                                                      {  
                                                                      ReleaseMutex(hMutex);  
                                                      }  
                                                      //投递消息  
                                                      while(!(blPostTM   =   PostThreadMessage(dThread,WM_WORK,iID,0)))  
                                                      {  
                                                                      //投递超时条件  
                                                                      if(iSecond   ==   3000)  
                                                                      {  
                                                                                      break;  
                                                                      }  
                                                                      Sleep(iSecond);  
                                                                      iSecond   +=   1000;  
                                                      }  
                                                      if(!blPostTM)  
                                                      {  
                                                                      //投递失败线程重回空闲池  
                                                                      WaitForSingleObject(hMutex,INFINITE);  
                                                                      vThreadsIdles->insert(valType(iID,dThread));  
                                                                      ReleaseMutex(hMutex);  
                                                                      cout   <<   AnsiString(dThread).c_str()   <<   "消息投递失败"   <<   endl;  
                                                                      continue;  
                                                      }  
                                                      cout   <<   AnsiString(dThread).c_str()   <<   "消息投递成功"   <<   endl;  
                                      }  
                      }  
      }  
      DWORD   WINAPI   ThreadWork(LPVOID   p)  
      {  
                      MSG   msg;  
                      int   iRet;  
                      int   iSecond;  
                      bool   blPostTM;  
                      while(true)  
                      {  
                                      iRet   =   GetMessage(&msg,NULL,0,0);  
                                      if(WM_WORK   ==   msg.message)  
                                      {  
                                                cout   <<   AnsiString(GetCurrentThreadId()).c_str()   <<   "正在处理...."   <<   endl;  
                                                Sleep(5000);  
                                                //处理完成线程重回空闲池  
                                                WaitForSingleObject(hMutex,INFINITE);  
                                                vThreadsIdles->insert(valType(msg.wParam,GetCurrentThreadId()));  
                                                ReleaseMutex(hMutex);  
                                                cout   <<   AnsiString(GetCurrentThreadId()).c_str()   <<   "空闲"   <<   endl;  
                                      }  
                      }  
      }

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  • 原文地址:https://www.cnblogs.com/hackpig/p/1668279.html
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