Python 中的进程通信

发布于 2024-11-30 09:41:57 字数 948 浏览 1 评论 0原文

在Python中两个进程之间建立通信的最佳方法是什么?经过一番谷歌搜索后,我尝试这样做:

parent_pipe, child_pipe = Pipe()
p = Process(target = instance_tuple.instance.run(), \
    args = (parent_pipe, child_pipe,))
p.start()

向子进程发送数据:

command = Command(command_name, args)
parent_pipe.send(command)

进程目标函数:

while True:
    if (self.parent_pipe.poll()):
        command = parent_pipe.recv()
        if (command.name == 'init_model'):
            self.init_model()
        elif (command.name == 'get_tree'):
            tree = self.get_fidesys_tree(*command.args)
            result = CommandResult(command.name, tree)
            self.child_pipe.send(result)
        elif(command.name == 'set_variable'):
            name = command.args[0]
            value = command.args[1]
            self.config[name] = value

但它似乎不起作用(子进程没有通过parent_pipe接收任何内容)。我该如何修复它?

提前致谢。

What is the best way to establish communication between two processes in python? After some googling, I tried to do so:

parent_pipe, child_pipe = Pipe()
p = Process(target = instance_tuple.instance.run(), \
    args = (parent_pipe, child_pipe,))
p.start()

Sending data to the child process:

command = Command(command_name, args)
parent_pipe.send(command)

Process target function:

while True:
    if (self.parent_pipe.poll()):
        command = parent_pipe.recv()
        if (command.name == 'init_model'):
            self.init_model()
        elif (command.name == 'get_tree'):
            tree = self.get_fidesys_tree(*command.args)
            result = CommandResult(command.name, tree)
            self.child_pipe.send(result)
        elif(command.name == 'set_variable'):
            name = command.args[0]
            value = command.args[1]
            self.config[name] = value

But it doesn't seem to work (child process doesn't receive anything through parent_pipe). How can I fix it?

Thanks in advance.

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评论(2

蹲墙角沉默 2024-12-07 09:41:57

您可以在这里查看:http://docs.python。 org/library/multiprocessing.html#exchang-objects- Between-processes
该解决方案与您的解决方案接近,但似乎更容易。

You can have a look here : http://docs.python.org/library/multiprocessing.html#exchanging-objects-between-processes
The solution is close to yours but seems easier.

瘫痪情歌 2024-12-07 09:41:57

如果我理解文档,在子进程中,您应该从管道的子部分读取。

# Process Target function

while True:
        # poll(None) because you don't want to go through the loop fast between commands
        if (self.child_pipe.poll(None)):    
            command = child_pipe.recv()
            if (command.name == 'init_model'):
                self.init_model()
            elif (command.name == 'get_tree'):
                tree = self.get_fidesys_tree(*command.args)
                result = CommandResult(command.name, tree)
                self.child_pipe.send(result)
            elif(command.name == 'set_variable'):
                name = command.args[0]
                value = command.args[1]
                self.config[name] = value

If I understand the documentation, in child process you should read from the child part of the pipe.

# Process Target function

while True:
        # poll(None) because you don't want to go through the loop fast between commands
        if (self.child_pipe.poll(None)):    
            command = child_pipe.recv()
            if (command.name == 'init_model'):
                self.init_model()
            elif (command.name == 'get_tree'):
                tree = self.get_fidesys_tree(*command.args)
                result = CommandResult(command.name, tree)
                self.child_pipe.send(result)
            elif(command.name == 'set_variable'):
                name = command.args[0]
                value = command.args[1]
                self.config[name] = value
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