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POCatching signals sent by runit (sv stop <id>)
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  1. POCatching signals sent by runit (sv stop <id>)
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    copied!<p>I have a python program that is running a number of worker processes. Because this has to be handled properly to avoid orphaned processes, I have implemented a signal handler to shutdown all worker processes.</p> <p>The program starts more or less like this:</p> <ol> <li>Start process pool (starts X number of workers)</li> <li>Register signal handlers (<code>signal.signal(signal.SIGTERM, my_signal_handler)</code>). I also add another signal handler for <code>SIGINT</code> with the same handler.</li> <li>Start seperate thread polling backend (database) and add the tasks to process pool.</li> <li>On main thread, poll process pool for results (there is a result <code>multiprocessing.Queue</code> that the individual workers add the results to).</li> </ol> <p>The idea is that the two seperate threads started in 3 and 4 keep the tasks running through the machinery.</p> <p>If I start this manually and call <code>kill -15 &lt;pid&gt;</code> or <code>kill -2 &lt;pid&gt;</code> it correctly shuts everything down, waits for processes to <code>join()</code>. Reading from the documentation, runit sends a <code>TERM</code> to the process, followed by <code>CONT</code>. However, running this under runit, it simply shows the standard <code>ok: down: &lt;my_program&gt;: 1s, normally up</code>, but the process is still running in the background (even the main process, it is UNTOUCHED).</p> <p>If I then afterwards go out and manually kill the process, I can see in the log file that it shuts down correctly. What am I doing wrong? It seems that runit ONLY kills the 3-line shell script I created to activate the virtualenv, but leaves the actual python process behind.</p> <p>Even if I run the "run" script directly, I can either run <code>kill</code> or Ctrl+C (same as <code>SIGINT</code>) and it shuts down correctly.</p>
 

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