多線程完成多個任務

 

 

typedef struct _THREADINOF{  BOOL *bExitFlag;  //退出標誌(共用)  HANDLE hExitEvent; //退出事件(共用)  HANDLE hRunEvent; //運行事件  HANDLE hDoneEvent; //運行完成事件  BOOL bThreadIsRuning; //線程運行中  UINT uThreadIndex; //線程索引  UINT uTaskID; //任務ID  LPCRITICAL_SECTION lpCriticalSection; //臨界區  //…… 其它資訊}THREADINOF;UINT ThreadFunction(LPVOID lParam){  THREADINOF *pThreadInfo = (THREADINOF*)lParam;  //參數檢查  ASSERT(pThreadInfo);  ASSERT(pThreadInfo->bExitFlag);  ASSERT(pThreadInfo->hExitEvent);  ASSERT(pThreadInfo->hRunEvent);  ASSERT(pThreadInfo->hDoneEvent);  //……其它初始化工作  while(pThreadInfo)  {    //等待事件    HANDLE hMultEvent[] = {pThreadInfo->hExitEvent, pThreadInfo->hRunEvent};    switch(WaitForMultipleObjects(2, hMultEvent, FALSE, INFINITE))    {    case(WAIT_OBJECT_0)://exit event      {        return -1;      }    case(WAIT_OBJECT_0 + 1)://run event      {        break;      }    default://error      {        ASSERT(FALSE);        break;      }    }    pThreadInfo->bThreadIsRuning = TRUE; //線程運行中    BOOL bTreadDone = FALSE;    for(;(!bTreadDone) && (*pThreadInfo->bExitFlag == 0);)    {            //……線程運行代碼      //類比某些長時間的操作      {        Sleep(rand()/32);      }      //某些必須的臨界區操作      if(pThreadInfo->lpCriticalSection)        EnterCriticalSection(pThreadInfo->lpCriticalSection);      //臨界區代碼      TRACE(_T("Thead(%u) Task(%u)\n"),        pThreadInfo->uThreadIndex,        pThreadInfo->uTaskID);      //退出臨界區      if(pThreadInfo->lpCriticalSection)        LeaveCriticalSection(pThreadInfo->lpCriticalSection);      if(1)//滿足線程任務完成條件      {        bTreadDone = TRUE;        break; //跳出迴圈      }      else//為其它線程留出時間      {        Sleep(100);        //SwitchToThread();//切換線程      }    }    //線程運行完成，通知父進程    {      SetEvent(pThreadInfo->hDoneEvent);      pThreadInfo->bThreadIsRuning = FALSE;//線程結束    }  }  return 0;}void RunTask(){#define MAX_THREAD_NUM 4//最多線程數  BOOL bTreadExitFlag = FALSE; //線程退出標誌  HANDLE hExitEvent = CreateEvent(NULL, TRUE, FALSE, NULL); //線程退出事件  HANDLE hRunEvent[MAX_THREAD_NUM] = {0};//通知線程運行事件  HANDLE hDoneEvent[MAX_THREAD_NUM] = {0};//線程運行完成事件  THREADINOF ThreadInfo[MAX_THREAD_NUM] = {0};  HANDLE hThread[MAX_THREAD_NUM] = {0};  CRITICAL_SECTION mCriticalSection;  InitializeCriticalSection(&mCriticalSection);  //建立線程  {    for(int i=0; i<MAX_THREAD_NUM; i++)    {      VERIFY(hRunEvent[i] = CreateEvent(NULL, FALSE, FALSE, NULL));      VERIFY(hDoneEvent[i] = CreateEvent(NULL, TRUE, TRUE, NULL));      ThreadInfo[i].uThreadIndex = i;      ThreadInfo[i].bExitFlag = &bTreadExitFlag;      ThreadInfo[i].hExitEvent = hExitEvent;      ThreadInfo[i].hRunEvent = hRunEvent[i];      ThreadInfo[i].hDoneEvent = hDoneEvent[i];      ThreadInfo[i].lpCriticalSection = &mCriticalSection;      //……其它參數      hThread[i] = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)ThreadFunction, &ThreadInfo[i], 0, NULL);      ASSERT(hThread[i]);    }  }  //運行線程    UINT uTaskID = 0;  BOOL bOverFlag = FALSE;  while(1)  {    if(bOverFlag) //任務結束    {      WaitForMultipleObjects(MAX_THREAD_NUM, hDoneEvent, TRUE, INFINITE);//等待所有線程結束      break;    }    else //執行任務    {      DWORD dwWait = WaitForMultipleObjects(MAX_THREAD_NUM, hDoneEvent, FALSE, INFINITE);      if(dwWait >= (WAIT_OBJECT_0 + MAX_THREAD_NUM))      {        ASSERT(FALSE);      }      else      {        int iThread = dwWait;        if(uTaskID < 100) //有新任務可以分配        {          //分配新任務          //ThreadInfo[i].xxx 設定新參數          ThreadInfo[iThread].uTaskID = uTaskID++; //          ResetEvent(ThreadInfo[iThread].hDoneEvent); //複位就緒事件          SetEvent(ThreadInfo[iThread].hRunEvent); //啟用線程                  }        else//所有任務完成        {          bOverFlag = TRUE;        }      }    }  }  //結束線程  {    bTreadExitFlag = TRUE;    SetEvent(hExitEvent);    WaitForMultipleObjects(MAX_THREAD_NUM, hThread, TRUE, INFINITE);  }  //清理工作  {    #define DoCloseHandle(h) do{ if(h)CloseHandle(h); h=NULL; }while(0);    DoCloseHandle(hExitEvent);    for(int i=0; i<MAX_THREAD_NUM; i++)    {      DoCloseHandle(hRunEvent[i]);      DoCloseHandle(hDoneEvent[i]);    }    DeleteCriticalSection(&mCriticalSection);  }}

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線程 'Win32 線程' (0xcd4) 已退出，傳回值為 -1 (0xffffffff)。
線程 'Win32 線程' (0xe58) 已退出，傳回值為 -1 (0xffffffff)。
線程 'Win32 線程' (0xf94) 已退出，傳回值為 -1 (0xffffffff)。
線程 'Win32 線程' (0xce4) 已退出，傳回值為 -1 (0xffffffff)。