Bugs item #701836, was opened at 2003-03-11 18:46
Message generated for change (Comment added) made by facundobatista
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Category: Python Interpreter Core
Group: Python 2.2.2
>Status: Closed
>Resolution: Wont Fix
Priority: 5
Submitted By: Johan Fredrik Öhman (johanfo)
Assigned to: Nobody/Anonymous (nobody)
Summary: Thread running (os.system or popen#)
Initial Comment:
Bottom line: Some programs may lock up when
spawned from a thread.
>>> import thread, os
>>> thread.start_new_thread(os.system,
("/usr/sbin/ntpdate ifi.uio.no",))
This starts a program "ntpdate" from a Python thread.
Usually this is no problem. Ntpdate, is a simple program
to adjust the clock of the system. However, when
ntpdate is started from a thread it locks up and newer
exits!! With my limited debugging knowledge, it sems
as it hangs in a "poll()" kernel call, however, this could
be misleading. (I used stacktrace -p <pid>)
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Comment By: Facundo Batista (facundobatista)
Date: 2005-05-30 16:29
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Deprecated. Reopen only if still happens in 2.3 or newer.
. Facundo
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Comment By: Facundo Batista (facundobatista)
Date: 2005-01-15 17:34
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Please, could you verify if this problem persists in Python 2.3.4
or 2.4?
If yes, in which version? Can you provide a test case?
If the problem is solved, from which version?
Note that if you fail to answer in one month, I'll close this bug
as "Won't fix".
Thank you!
. Facundo
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Comment By: Facundo Batista (facundobatista)
Date: 2005-01-15 17:34
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Works ok for me:
Python 2.3.4 (#1, Oct 26 2004, 16:42:40)
[GCC 3.4.2 20041017 (Red Hat 3.4.2-6.fc3)] on linux2
Type "help", "copyright", "credits" or "license" for more
information.
>>> import thread, os
>>> thread.start_new_thread(os.system,("/usr/sbin/ntpdate
ifi.uio.no",))
-1210684496
>>>
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Comment By: Johan Fredrik Öhman (johanfo)
Date: 2003-03-12 13:12
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I have verified this bug on both Redhat 8.0 and SuSE 8.1,
linux yes.
Signal is one possible path, filedescriptors another. I read
somwhere that there was some issues with pthreads forking
and filedescriptors. However, this is not my area (too low
level)....
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Comment By: Michael Hudson (mwh)
Date: 2003-03-12 09:40
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IIRC, threads other than the main thread get a signal mask
that blocks everything. That could be the problem, but I
don't know what to do about it...
What platform are you on? Linux?
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