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POGunicorn + Subprocesses raises exception [Errno 10]
 

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  1. POGunicorn + Subprocesses raises exception [Errno 10]
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    <p>I've stumbled across a weird exception I haven't been able to resolve... can anyone suggest what is wrong or a new design? I'm running a Gunicorn/Flask application. In the configuration file, I specify some work to do with an <code>on_starting</code> hook [1]. Inside that hook code, I have some code like this (nothing fancy):</p> <pre><code># Called before the server is started my_thread = package.MyThread() my_thread.start() </code></pre> <p>The package.MyThread class looks like the following. The <code>ls</code> command is unimportant, it can be any command.</p> <pre><code>class MyThread(threading.Thread): """ Run a command every 60 seconds. """ def __init__(self): threading.Thread.__init__(self) self.event = threading.Event() def run(self): while not self.event.is_set(): ptest = subprocess.Popen(["ls"], stdout=subprocess.PIPE) ptest.communicate() self.event.wait(60) def stop(self): self.event.set() </code></pre> <p>Upon starting up the server, I'm always presented with this exception:</p> <pre><code>Exception in thread Thread-1: Traceback (most recent call last): File "/usr/lib64/python2.6/threading.py", line 532, in __bootstrap_inner self.run() File "__init__.py", line 195, in run ptest.communicate() File "/usr/lib64/python2.6/subprocess.py", line 721, in communicate self.wait() File "/usr/lib64/python2.6/subprocess.py", line 1288, in wait pid, sts = _eintr_retry_call(os.waitpid, self.pid, 0) File "/usr/lib64/python2.6/subprocess.py", line 462, in _eintr_retry_call return func(*args) OSError: [Errno 10] No child processes </code></pre> <p>Can anyone suggest what is going on here? I haven't tried implementing the changes in [2], they seemed hacky.</p> <p>[1] - <a href="http://gunicorn.org/configure.html#server-hooks" rel="nofollow noreferrer">http://gunicorn.org/configure.html#server-hooks</a></p> <p>[2] - <a href="https://stackoverflow.com/questions/1008858/popen-communicate-throws-oserror-errno-10-no-child-processes">Popen.communicate() throws OSError: &quot;[Errno 10] No child processes&quot;</a></p>
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