svn commit: r188727 - in stable/7: sys sys/contrib/pf
sys/dev/ath/ath_hal
sys/dev/cxgb sys/kern sys/modules/sem sys/sys tools/regression/posixsem
usr.bin/procstat
Bruce Simpson
bms at incunabulum.net
Wed Feb 18 00:18:10 PST 2009
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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