如何保持Twisted spawnProcess長時間運行的進程？

Question

我是扭曲的新手。我最近遇到這個問題，希望得到一些幫助。據我所知，雙絞線作爲單線程環路運行。當我產生另一個進程從循環中獲取輸入（並且稍後將結果傳遞迴循環）時，即使沒有任何輸入傳遞給它，該進程也會立即退出（請參閱下面的代碼）。

另外，是否有可能讓ONE衍生進程長時間運行，而不是每次接收到輸入時產生新進程？

非常感謝您的時間，

Q

from sys import executable 
from os import environ 
import os 
from twisted.internet import reactor 
from twisted.internet.protocol import Protocol 
from twisted.internet.protocol import Factory 
from twisted.internet import protocol 

implementation = """\ 
import os 
print "in child", os.getpid() 
""" 

class Echo(Protocol): 
    def dataReceived(self, data): 
     reactor.spawnProcess(pp, executable, [executable, "-c", implementation], env=environ) 
     self.transport.write(data) 

class EchoFactory(Factory): 
    def buildProtocol(self, addr): 
     return Echo() 

class MyPP(protocol.ProcessProtocol): 

    def connectionMade(self): 
     print "connectionMade!" 
    def outReceived(self, data): 
     print "out", data 
    def errReceived(self, data): 
     print "error", data 
    def inConnectionLost(self): 
     print "inConnectionLost! stdin is closed! (we probably did it)" 
    def outConnectionLost(self): 
     print "outConnectionLost! The child closed their stdout!" 
    def errConnectionLost(self): 
     print "errConnectionLost! The child closed their stderr." 
    def processExited(self, reason): 
     print "processExited, status %d" % (reason.value.exitCode,) 
    def processEnded(self, reason): 
     print "processEnded, status %d" % (reason.value.exitCode,) 
     print "quitting" 

reactor.listenTCP(8200, EchoFactory()) 
pp = MyPP() 
print 'in parent', os.getpid() 
reactor.spawnProcess(pp, executable, [executable, "-c", implementation], env=environ) 
reactor.run() 

Answer 1

扭不控制子進程退出時。子進程負責這個（有一兩個例外，這裏不重要）。您的子進程，運行此代碼的Python程序：

import os 
print "in child", os.getpid() 

只要打印了自己的PID，就會退出。無論是使用Twisted還是以其他方式啓動它，這都是它的行爲。如果你想要它等待輸入，那麼你必須爲程序添加代碼。