[issue6800] os.exec* raises "OSError: [Errno 45] Operation not supported" in a multithreaded application
report at bugs.python.org
Sat Aug 29 05:19:48 CEST 2009
New submission from Reid Kleckner <rnk at mit.edu>:
The test case is attached. On Mac OS X (and presumably FreeBSD, which
has the same behavior) when you try to exec from a process that has any
other threads in it, you get an OSError, "Operation not supported".
Here's the output on my MacBook:
Traceback (most recent call last):
File "daemon_exec.py", line 16, in <module>
File "daemon_exec.py", line 13, in main
os.execl('echo', 'hello world')
line 312, in execl
OSError: [Errno 45] Operation not supported
And on my Linux box:
Here's a similar bug that OCaml had to deal with:
I think it's reasonable for Python to declare this to be a limitation of
the OS, but considering that the other thread could be a daemon thread
that the user doesn't really care about, I think it would be reasonable
for Python to kill the other threads in the process before execing.
That's what happens on Linux, anyway.
I ran into this problem while trying to add a persistent background
compilation thread to unladen swallow, and wondered if having any other
threads would trigger the same exception.
It's tempting to just write this off, but I figured it should be
documented or left open as a low priority defect.
nosy: rnk, ronaldoussoren
title: os.exec* raises "OSError: [Errno 45] Operation not supported" in a multithreaded application
versions: Python 2.6
Added file: http://bugs.python.org/file14798/daemon_exec.py
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