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From b881a79adcd4ae5ac8fe4f49d0fc77c47f777919 Mon Sep 17 00:00:00 2001
From: Hongxu Jia <hongxu.jia@windriver.com>
Date: Fri, 4 Aug 2017 11:16:14 +0800
Subject: [PATCH] setup.py: pass missing libraries to Extension for
multiprocessing module
In the following commit:
...
commit e711cafab13efc9c1fe6c5cd75826401445eb585
Author: Benjamin Peterson <benjamin@python.org>
Date: Wed Jun 11 16:44:04 2008 +0000
Merged revisions 64104,64117 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk
...
(see diff in setup.py)
It assigned libraries for multiprocessing module according
the host_platform, but not pass it to Extension.
In glibc, the following commit caused two definition of
sem_getvalue are different.
https://sourceware.org/git/?p=glibc.git;a=commit;h=042e1521c794a945edc43b5bfa7e69ad70420524
(see diff in nptl/sem_getvalue.c for detail)
`__new_sem_getvalue' is the latest sem_getvalue@@GLIBC_2.1
and `__old_sem_getvalue' is to compat the old version
sem_getvalue@GLIBC_2.0.
To build python for embedded Linux systems:
http://www.yoctoproject.org/docs/2.3.1/yocto-project-qs/yocto-project-qs.html
If not explicitly link to library pthread (-lpthread), it will
load glibc's sem_getvalue randomly at runtime.
Such as build python on linux x86_64 host and run the python
on linux x86_32 target. If not link library pthread, it caused
multiprocessing bounded semaphore could not work correctly.
...
>>> import multiprocessing
>>> pool_sema = multiprocessing.BoundedSemaphore(value=1)
>>> pool_sema.acquire()
True
>>> pool_sema.release()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: semaphore or lock released too many times
...
And the semaphore issue also caused multiprocessing.Queue().put() hung.
Upstream-Status: Submitted [https://github.com/python/cpython/pull/2999]
Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
---
setup.py | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/setup.py b/setup.py
index b7a36a6..658ead3 100644
--- a/setup.py
+++ b/setup.py
@@ -1584,8 +1584,10 @@ class PyBuildExt(build_ext):
elif host_platform.startswith('netbsd'):
macros = dict()
libraries = []
-
- else: # Linux and other unices
+ elif host_platform.startswith(('linux')):
+ macros = dict()
+ libraries = ['pthread']
+ else: # Other unices
macros = dict()
libraries = ['rt']
@@ -1603,6 +1605,7 @@ class PyBuildExt(build_ext):
exts.append ( Extension('_multiprocessing', multiprocessing_srcs,
define_macros=list(macros.items()),
+ libraries=libraries,
include_dirs=["Modules/_multiprocessing"]))
# End multiprocessing
|
