当启用多个线程时,如何知道它们当中谁先完成

2013-06-05 07:33:36 204 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

超详细 Git创建仓库及上传项目至Github操作（Windows系统）文章目录前言一、Git下载及安装二、创建代码仓库1.配置身份2.创建本地仓库3.提交本地代码三、使用Git上传代码至Github1.创建ssh keys2.在Github中新建仓库3.关联本地仓库与Github仓库4.推送代码至Github仓库总结前言本文对于Windows系统上git的安装及基本使用方法进行简单介绍，并介绍如何使用git将仓库中的项目上传至个人的Github中去。内容参考《第一行代码》以及一些博客。本文适合新手阅读哦~ 一、Git下载及安装打开网站 git下载下载安装包（直接阅读详情



typedef struct _THREAD_PARAM{

	DWORD ProdID;

	DWORD StockID;

	int random;

}THREAD_PARAM,*LPTHREAD_PARAM;

DWORD WINAPI FunlProc(LPVOID lpParameter)

{

	LPTHREAD_PARAM pData;;

	pData=(LPTHREAD_PARAM)lpParameter;

	//int random=rand()%1000;



	for (int n = 0; n < pData->random; n++)

	{

		Sleep(100);

	}



	TRACE("TID =%u,\t ProdID=%u,\t StockID=%u,\t random=%d\n",GetCurrentThreadId(),pData->ProdID,pData->StockID,pData->random);

	HeapFree(GetProcessHeap(),0,pData);

	return 0;

}



void CThreadDemoDlg::OnButtonTest() 

{

	// TODO: Add your control notification handler code here

	MessageBox("测试开启");

	int ThreadNumber;

	int i;

	LPTHREAD_PARAM pData;

	HANDLE hThread[3];

	DWORD dw;

	int iUseThread;



	for(i=0;i<3;i++)

	{

		hThread[i]=NULL;

	}



	for(ThreadNumber=1;ThreadNumber<=12;ThreadNumber++)

	{

		if (ThreadNumber<=3)

		{

			pData=(LPTHREAD_PARAM)HeapAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,sizeof(THREAD_PARAM));

			if(pData==NULL)

			{

				MessageBox("内存分配错误");

				return;

			}

			pData->ProdID=ThreadNumber ;//(ThreadNumber*10)+i;

			pData->StockID=(ThreadNumber*100)+i;

			pData->random=rand()%100;

			hThread[ThreadNumber-1]=CreateThread(NULL,0,FunlProc,pData,0,NULL);

			if(hThread[ThreadNumber-1]==NULL)

			{

				ExitProcess(ThreadNumber-1);

			}			

		}

		else

		{

			

			iUseThread=-1;

			while(iUseThread==-1)

			{

				for(i=0;i<3;i++)

				{

					dw=WaitForSingleObject(hThread[i],INFINITE);



					if(dw==WAIT_OBJECT_0)

					{

						TRACE("ThreadNumber=%d\t iUseThread=%d\n",ThreadNumber,i);

						iUseThread=i;

						CloseHandle(hThread[i]);

						break;

					}

				}

			}

			

			pData=(LPTHREAD_PARAM)HeapAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,sizeof(THREAD_PARAM));

			if(pData==NULL)

			{

				MessageBox("内存分配错误");

				return;

			}

			pData->ProdID=ThreadNumber;//(ThreadNumber*10)+i;

			pData->StockID=(ThreadNumber*100)+i;

			pData->random=rand()%100;

			hThread[iUseThread]=CreateThread(NULL,0,FunlProc,pData,0,NULL);

			if(hThread[iUseThread]==NULL)

			{

				ExitProcess(iUseThread);

			}			

		}

	}

dw=WaitForSingleObject(hThread[i],INFINITE);
if(dw==WAIT_OBJECT_0)
{
TRACE("ThreadNumber=%d\t iUseThread=%d\n",ThreadNumber,i);
iUseThread=i;
CloseHandle(hThread[i]);
break;
}
我的本意是想判断3个线程中谁先完成就用谁又在开启一个线程
但总的线程数量只有3个
但是使用WaitForSingleObject 变成了始终去等第一个线程完成去了
这个地方我向请问下各位大侠该怎么写
或者说当我要开启N个任务要做时但一次只允许有3个线程去处理,谁先做完后,就立即释放一个线程,同时又在开启一个线程时这种情况该怎么处理比较好谢谢各位了！

...全文

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切换为时间正序

LostSpeed 2013-06-05

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vs2008 msdn 上有例子 ms-help://MS.VSCC.v90/MS.MSDNQTR.v90.en/dllproc/base/waiting_for_multiple_objects.htm


#include <windows.h>
#include <stdio.h>

HANDLE ghEvents[2];

DWORD WINAPI ThreadProc( LPVOID );

void main()
{
    HANDLE hThread; 
    DWORD i, dwEvent, dwThreadID; 

    // Create two event objects

    for (i = 0; i < 2; i++) 
    { 
        ghEvents[i] = CreateEvent( 
            NULL,   // default security attributes
            FALSE,  // auto-reset event object
            FALSE,  // initial state is nonsignaled
            NULL);  // unnamed object

        if (ghEvents[i] == NULL) 
        { 
            printf("CreateEvent error: %d\n", GetLastError() ); 
            ExitProcess(0); 
        } 
    } 

    // Create a thread

    hThread = CreateThread( 
                 NULL,         // default security attributes
                 0,            // default stack size
                 (LPTHREAD_START_ROUTINE) ThreadProc, 
                 NULL,         // no thread function arguments
                 0,            // default creation flags
                 &dwThreadID); // receive thread identifier

    if( hThread == NULL )
    {
        printf("CreateThread error: %d\n", GetLastError());
        return;
    }

    // Wait for the thread to signal one of the event objects

    dwEvent = WaitForMultipleObjects( 
        2,           // number of objects in array
        ghEvents,     // array of objects
        FALSE,       // wait for any object
        5000);       // five-second wait

    // The return value indicates which event is signaled

    switch (dwEvent) 
    { 
        // ghEvents[0] was signaled
        case WAIT_OBJECT_0 + 0: 
            // TODO: Perform tasks required by this event
            printf("First event was signaled.\n");
            break; 

        // ghEvents[1] was signaled
        case WAIT_OBJECT_0 + 1: 
            // TODO: Perform tasks required by this event
            printf("Second event was signaled.\n");
            break; 

        case WAIT_TIMEOUT:
            printf("Wait timed out.\n");
            break;

        // Return value is invalid.
        default: 
            printf("Wait error: %d\n", GetLastError()); 
            ExitProcess(0); 
    }

    // Close event handles

    for (i = 0; i < 2; i++) 
        CloseHandle(ghEvents[i]);    
}

DWORD WINAPI ThreadProc( LPVOID lpParam )
{
    // Set one event to the signaled state

    if ( !SetEvent(ghEvents[0]) ) 
    {
        printf("SetEvent failed (%d)\n", GetLastError());
        return -1;
    }
    return 1;
}

yaozhiyong110 2013-06-05

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先完成的把自己的threadid放入一个全局vector呗

$扫地僧$ 2013-06-05

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搞个线程池阿 --------- 能否给我实例我参考下！3QWaitForMultiObject WaitForMultiObject 这个有试个这个函数会等待多个线程完成，我想的是谁先完成谁就开启新的线程但总线程不能超过我设定的数

凤矶 2013-06-05

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WaitForMultiObject

快乐鹦鹉 2013-06-05

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搞个线程池阿

当启用多个线程时,如何知道它们当中谁先完成

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