From 7019ba184b828ed7253750cf409fc5760ef90a54 Mon Sep 17 00:00:00 2001
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From: Alexander Kanavin <alex.kanavin@gmail.com>
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Date: Thu, 9 Jan 2020 17:44:05 +0100
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Subject: [PATCH] setup.py: pass missing libraries to Extension for
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multiprocessing module
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In the following commit:
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...
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commit e711cafab13efc9c1fe6c5cd75826401445eb585
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Author: Benjamin Peterson <benjamin@python.org>
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Date: Wed Jun 11 16:44:04 2008 +0000
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Merged revisions 64104,64117 via svnmerge from
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svn+ssh://pythondev@svn.python.org/python/trunk
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...
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(see diff in setup.py)
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It assigned libraries for multiprocessing module according
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the host_platform, but not pass it to Extension.
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In glibc, the following commit caused two definition of
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sem_getvalue are different.
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https://sourceware.org/git/?p=glibc.git;a=commit;h=042e1521c794a945edc43b5bfa7e69ad70420524
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(see diff in nptl/sem_getvalue.c for detail)
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`__new_sem_getvalue' is the latest sem_getvalue@@GLIBC_2.1
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and `__old_sem_getvalue' is to compat the old version
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sem_getvalue@GLIBC_2.0.
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To build python for embedded Linux systems:
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http://www.yoctoproject.org/docs/2.3.1/yocto-project-qs/yocto-project-qs.html
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If not explicitly link to library pthread (-lpthread), it will
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load glibc's sem_getvalue randomly at runtime.
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Such as build python on linux x86_64 host and run the python
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on linux x86_32 target. If not link library pthread, it caused
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multiprocessing bounded semaphore could not work correctly.
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...
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>>> import multiprocessing
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>>> pool_sema = multiprocessing.BoundedSemaphore(value=1)
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>>> pool_sema.acquire()
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True
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>>> pool_sema.release()
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Traceback (most recent call last):
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File "<stdin>", line 1, in <module>
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ValueError: semaphore or lock released too many times
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...
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And the semaphore issue also caused multiprocessing.Queue().put() hung.
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Upstream-Status: Pending
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Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
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Signed-off-by: Alexander Kanavin <alex.kanavin@gmail.com>
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---
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setup.py | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/setup.py b/setup.py
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index ec3f2a4..b0f1541 100644
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--- a/setup.py
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+++ b/setup.py
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@@ -1671,7 +1671,7 @@ class PyBuildExt(build_ext):
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libraries=libs,
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include_dirs=["Modules/_multiprocessing"]))
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- self.add(Extension('_multiprocessing', multiprocessing_srcs,
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+ self.add(Extension('_multiprocessing', multiprocessing_srcs, libraries=['pthread'],
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include_dirs=["Modules/_multiprocessing"]))
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def detect_uuid(self):
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