小编dae*_*oon的帖子

https://msdn.microsoft.com/library/jj950082.aspx有以下代码.

void IterateJSONValue()
{
    // Create a JSON object.
    json::value obj;
    obj[L"key1"] = json::value::boolean(false);
    obj[L"key2"] = json::value::number(44);
    obj[L"key3"] = json::value::number(43.6);
    obj[L"key4"] = json::value::string(U("str"));

    // Loop over each element in the object.
    for(auto iter = obj.cbegin(); iter != obj.cend(); ++iter)
    {
        // Make sure to get the value as const reference otherwise you will end up copying
        // the whole JSON value recursively which can be expensive if it is a nested object.
        const json::value &str = iter->first;
        const json::value …

如下所示,我想与特定IP范围内的许多PC进行通信.

My PC ---+------> Client A PC
         +------> Client B PC
         +------> Client C PC
         .................
         +------> Client Z PC

因为有太多客户端要沟通,所以我尝试了多线程.socket.connect()不断产生超时错误.如果我在单线程中尝试它,那就没问题了.

我用Google搜索并找到了以下内容:

Python解释器阻止多线程DNS请求？

说在某些平台上,套接字模块可能是线程不安全的.

所以我将代码更改为多处理.但是它仍然会产生相同的错误.

在以下代码示例中,test_single()完成正常.test_mp()和test_mt()都会导致超时错误.

你有没有经历过这种异常行为？测试环境是Windows XP SP3,python 2.5.4.还尝试了python 2.6.6和2.7.0,同样的错误.

import multiprocessing
import Queue
import socket
import threading

PROCESS_NUM = 5
PORT = 8888

def search_proc(ip):
    try:
        csock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        csock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
        csock.settimeout(5.0)
        csock.connect((ip, PORT))
        csock.shutdown(socket.SHUT_RDWR)
        csock.close()
        return ip, "ok"
    except socket.error, msg:
        return ip, "fail", msg

def mp_connect(ip_range):
    pool = multiprocessing.Pool( PROCESS_NUM )
    for output in …