[New-bugs-announce] [issue6532] thread.get_ident() should return unsigned value

Wojciech Lichota report at bugs.python.org
Tue Jul 21 16:25:25 CEST 2009

New submission from Wojciech Lichota <wojciech at lichota.pl>:

In glibc library (on linux) pthread_t is defined as:

typedef unsigned long int pthread_t;

But python thread module interprets this value as signed long. 

>>> import thread
>>> thread.get_ident()
In some cases it returns negative value.
Checked in python 2.4, 2.5, 2.6

In my opinion code that cast value returned by pthread_self() should be
changed (see: Python/thread_pthread.h).

Other possibility is to change only returned value by get_ident
function. In this case it should use PyLong_FromUnsignedLong (see:

logging module uses 'thread.get_ident()' to save thread_id in logs. If
the same application uses some C library that also writes in log file
some info with thread_id, in some situations this numbers are diffrent.
This complicate logs analyze.

components: Library (Lib)
messages: 90761
nosy: sargo
severity: normal
status: open
title: thread.get_ident() should return unsigned value
versions: Python 2.4, Python 2.5, Python 2.6

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