关于等待多于64个线程的解决方法_双路超过64线程-优快云博客

本文链接：https://blog.youkuaiyun.com/yujianhengxing/article/details/6564492

本文介绍了一种在C++中处理超过64个线程等待的方法，并提供了具体的代码实现。通过对WaitForMultipleObjects函数的使用及扩展，确保了能够正确等待大量线程结束。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

C++中，WaitForMultipleObjects函数的功能是：等待N个对象（这里是线程）全部结束后，再执行后面的语句。该函数第一个参数是要等待的对象数，该参数的数据类型尽管是DWORD，但实际上这个参数是有限制的，它的值应该是大于0而小于MAXIMUM_WAIT_OBJECTS。

参见WinNT.h
#define MAXIMUM_WAIT_OBJECTS 64 // Maximum number of wait objects

因而当线程数多于64时WaitForMultipleObjects应做如下更改：

    int tempNumThreads = numThreads;
    int tempMax = 0;
    while( tempNumThreads >= MAXIMUM_WAIT_OBJECTS )
    {
        tempNumThreads -= MAXIMUM_WAIT_OBJECTS;
        WaitForMultipleObjects( MAXIMUM_WAIT_OBJECTS, &hThread[ tempMax], TRUE, INFINITE);
        tempMax += MAXIMUM_WAIT_OBJECTS;
    }
    WaitForMultipleObjects( tempNumThreads, &hThread[ tempMax ], TRUE, INFINITE);

上面是我在网上找到的代码，然后根据此我对我的代码修改，OK ，搞定！！哈哈

DWORD ByteRead = 0; while (1) { int IpCounts = 0; for (int i = 0; i < Threads; i++) { DWORD ThreadIP = 0; ReadFile(hFile, (char*)&ThreadIP, 4, &ByteRead, NULL); if ( ByteRead < 4 )//没有读到数据 { IpCounts = i;//记录此次循环读到的IP数目 break; } in_addr s_a = {0}; s_a.S_un.S_addr = htonl(ThreadIP); memset(Thread_Param[i].IPstr, 0, 30);//只对结构中的Ip字段进行初始化 lstrcpyA(Thread_Param[i].IPstr, inet_ntoa(s_a)); Thread_Param[i].B_Execute = 0; DWORD ThreadId = 0; ThreadHandle[i] = CreateThread(NULL, NULL, MyThreads, &Thread_Param[i], 0, &ThreadId);//建立一个线程 if ( i == (Threads-1) )//到了最后一个线程 { IpCounts = i + 1;//记录此次循环读到的IP数目 } } //等待多于64个线程的处理，小于 int tempNumThreads = IpCounts; int tempMax = 0; while( tempNumThreads >= MAXIMUM_WAIT_OBJECTS ) { tempNumThreads -= MAXIMUM_WAIT_OBJECTS; WaitForMultipleObjects( MAXIMUM_WAIT_OBJECTS, &ThreadHandle[tempMax], TRUE, 3000); tempMax += MAXIMUM_WAIT_OBJECTS; } WaitForMultipleObjects( tempNumThreads, &ThreadHandle[ tempMax ], TRUE, 3000); //WaitForMultipleObjects(IpCounts, ThreadHandle, TRUE, 3000); for (int i = 0; i < Threads; i++)//关闭线程句柄,处理某些IP查询失败的情况 { CloseHandle(ThreadHandle[i]); DWORD ByteWritten = 0; if(Thread_Param[i].B_Execute == 0)//检查这个IP查询是否成功，通过B_Execute的值来判断 { DWORD BEIpFail = ntohl(inet_addr(Thread_Param[i].IPstr)); WriteFile(hFailIPListFile, &BEIpFail, 4, &ByteWritten, NULL); //printf("%s whois query failed/n", Thread_Param[i].IPstr); } } if (IpCounts < Threads) { break; } }