[Patches] [ python-Patches-1544279 ] Socket module is not thread-safe
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Sun Dec 3 12:24:30 CET 2006
Patches item #1544279, was opened at 2006-08-22 01:24
Message generated for change (Comment added) made by loewis
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Category: Core (C code)
Group: None
>Status: Closed
>Resolution: Accepted
Priority: 7
Private: No
Submitted By: Maxim Sobolev (sobomax)
Assigned to: Martin v. Löwis (loewis)
Summary: Socket module is not thread-safe
Initial Comment:
The socket module make a great effort to be thread-
safe, but misses one
big point - it uses single per-instance buffer to hold
resolved
sockaddr_xxx structures. Therefore, on SMP system it
is possible that
several threads calling functions that perform address
resolution in
parallel will stomp on each other resulting in
incorrect or invalid address
to be used in each case.
For example, two threads calling sendto() in parallel
can result in packets
to be sent to incorrect addresses - packets from
thread one from time to
time will be sent to address requested by thread two
and vice versa.
Another, smaller issue is that the call to getnameinfo
() is not protected
with netdb mutex on systems that don't have thread-
safe resolver.
P.S. This is very serious problem for us. For some
reason my previous patch submission has been
downgraded to bug report and forgotten completely, so
that I am re-submitting.
----------------------------------------------------------------------
>Comment By: Martin v. Löwis (loewis)
Date: 2006-12-03 12:24
Message:
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Originator: NO
Thanks for the patch. Committed as r52906 and r52907.
----------------------------------------------------------------------
Comment By: Martin v. Löwis (loewis)
Date: 2006-08-22 01:42
Message:
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user_id=21627
Sorry about forgetting your patch. Will look at it again for 2.5.1.
P.S. The previous issue was #1467080. It wasn't "downgraded to bug
report";
instead, you submitted it as a bug report to start with.
----------------------------------------------------------------------
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