Charles-François Natali neolo...@free.fr added the comment:
-1
IMHO, implementing SysV semaphores would be a step backwards, plus the API is a
real pain.
I think there's no reason to complicate the code to accomodate such corner
cases, especially since the systems that don't support POSIX
Antoine Pitrou pit...@free.fr added the comment:
Agreed with Charles-François.
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nosy: +pitrou
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http://bugs.python.org/issue10348
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Jesse Noller jnol...@gmail.com added the comment:
Charles and Antoine's votes match my own, therefore closing the bug wont fix
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resolution: - wont fix
status: open - closed
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STINNER Victor victor.stin...@haypocalc.com added the comment:
Martin fixed test_concurrent_futures (#10798), this issue can be implemented
later.
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type: - feature request
versions: +Python 3.3 -Python 3.2
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Python tracker
STINNER Victor victor.stin...@haypocalc.com added the comment:
More info about FreeBSD.
sysctl p1003_1b.sem_nsems_max gives the maximum number of POSIX semaphores
(per process? system wide?).
Since FreeBSD 8.1, sudo sysctl -w p1003_1b.sem_nsems_max=256 can be used to
change this limit at
STINNER Victor victor.stin...@haypocalc.com added the comment:
NetBSD.
Extract of the sem_close() manpage
http://www.daemon-systems.org/man/sem_close.3.html
---
STANDARDS
The sem_open(), sem_close(), and sem_unlink() functions conform to
ISO/IEC 9945-1:1996 (``POSIX.1'').
HISTORY
STINNER Victor victor.stin...@haypocalc.com added the comment:
Darwin (Mac OS X).
According to the following email (July 2010), Darwin supports POSIX semaphores
and the default limit is 10,000 semaphores.
http://osdir.com/ml/darwin-dev/2010-07/msg00012.html
The limit is configurable via
STINNER Victor victor.stin...@haypocalc.com added the comment:
OpenBSD.
According to Martin, OpenBSD doesn't implement POSIX semaphores.
---
I don't have an installation of OpenBSD, but...
In FreeBSD, POSIX semaphores are implemented in sys/kern/uipc_sem.c.
In
Jesse Noller jnol...@gmail.com added the comment:
Adding, or moving, to SYSV semaphores is very low on the list of things to do.
If someone were to provide a patch, I'm sure we could consider it.
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STINNER Victor victor.stin...@haypocalc.com added the comment:
Informations about SysV semaphores:
- functions: semget(), semop(), semctl(), ftok()
- http://perldoc.perl.org/IPC/SysV.html
- http://beej.us/guide/bgipc/output/html/multipage/semaphores.html
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STINNER Victor victor.stin...@haypocalc.com added the comment:
Examples of programs using SysV semaphores:
http://firebird.cvs.sourceforge.net/viewvc/firebird/firebird2/src/jrd/isc_sync.cpp?revision=HEADview=markup
(Firebird, search #ifdef USE_SYS5SEMAPHORE sections)
STINNER Victor victor.stin...@haypocalc.com added the comment:
See also #5725.
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STINNER Victor victor.stin...@haypocalc.com added the comment:
See also http://semanchuk.com/philip/sysv_ipc/: System V IPC for Python -
Semaphores, Shared Memory and Message Queues
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Changes by Antoine Pitrou pit...@free.fr:
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nosy: +asksol
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New submission from STINNER Victor victor.stin...@haypocalc.com:
Support POSIX semaphore on FreeBSD is recent, optional (eg. disabled by default
in FreeBSD 7) and limited (30 semaphores). SYSV should be used instead because
they are less limited or more adjustable (at runtime: POSIX semaphore
STINNER Victor victor.stin...@haypocalc.com added the comment:
It looks like SysV semaphores are also preferred on Darwin. So I suppose that
Mac OS X would also benefit of this issue. Maybe also other OSes (Solaris?).
See also issue #7272.
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nosy: +jnoller
title: multiprocessing: use
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