John Baldwin wrote:
Author: jhb
Date: Tue Feb 17 19:57:52 2009
New Revision: 188727
URL: http://svn.freebsd.org/changeset/base/188727
Log:
MFC: Rework the lifetime management of the kernel implementation of POSIX
semaphores. Specifically, semaphores are now represented as new file
descriptor type that is set to close on exec. This removes the need for
all of the manual process reference counting (and fork, exec, and exit
event handlers) as the normal file descriptor operations handle all of
that for us nicely. It is also suggested as one possible implementation
in the spec and at least one other OS (OS X) uses this approach.
FYI:
This change *may* fix Python 2.6's 'multiprocessing' module on FreeBSD
7-STABLE, which is known to have problems there; it depends on POSIX
semaphores to synchronize its IPC between different fork()'s of the
Python interpreter.
If anyone else has an interest in ths they may wish to test, if not, I
will try to get around to it eventually.
cheers
BMS
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