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
Kris Kennaway
kris at FreeBSD.org
Sat Feb 21 04:56:24 PST 2009
John Baldwin wrote:
> On Wednesday 18 February 2009 3:18:03 am Bruce Simpson wrote:
>> 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.
>
> When Kris tested it, it made things significantly better. I'm not sure if it
> resolved all the issues though.
>
Some of the self-tests still failed, but there was confusion about
whether the tests were broken or the kernel.
Kris
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