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POasynchronous subprocess with timeout
 

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    <p>I have a problem with spawning asynchronous subprocesses with timeout in Python 3.</p> <p>What I want to achieve: I want to spawn multiple processes asynchronously without waiting for a results but I want also be assured that every spawned process will end within given timeout.</p> <p>I have found similar problems here: <a href="https://stackoverflow.com/questions/1191374">Using module &#39;subprocess&#39; with timeout</a> and <a href="https://stackoverflow.com/questions/2496772">Asynchronous background processes in Python?</a> but they does not solve my issue.</p> <p>My code looks like this. I have Command class as suggested in <a href="https://stackoverflow.com/questions/1191374">Using module &#39;subprocess&#39; with timeout</a> :</p> <pre><code>class Command(object): def __init__(self, cmd): self.cmd = cmd self.process = None def run(self, timeout): def target(): print('Thread started') args = shlex.split(self.cmd) self.process = subprocess.Popen(args, shell=True) self.process.communicate() print('Thread finished') thread = threading.Thread(target=target) thread.start() thread.join(timeout) if thread.is_alive(): print('Terminating process') self.process.terminate() thread.join() </code></pre> <p>and then when I want to spawn subprocesses:</p> <pre><code>for system in systems: for service in to_spawn_system_info: command_str = "cd {0} &amp;&amp; python proc_ip.py {1} {2} 0 2&gt;&gt;{3}".format(home_dir, service, system, service_log_dir) command = Command(command_str) command.run(timeout=60) </code></pre> <p>When I run this the output seems to wait for every command to spawn and end. I get</p> <pre><code>Thread started Thread finished Thread started Thread finished Thread started Thread finished Thread started Thread finished </code></pre> <p>So my question is what I am doing wrong? Now I starting to wonder if it is possible to spawn a process and limit its execution by timeout.</p> <p>Why I need this? The spawner script will run in cron. It will be executed every 10 minutes and it has to spawn about 20 subprocesses. I want to guarantee that every subprocess will end before the script will be run again from cron.</p>
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