Re: Feature: POSIX Shared memory support

Yes, as Tom pointed out. Sorry, I misread the autoconf file. I've
gotten quite used to Darwin == BSD.
I've added a note to my todo list to look into the posix semaphore
performance on the Darwin side.

--Chris

On Feb 6, 2007, at 8:32 PM, Takayuki Tsunakawa wrote:

>>> Then, how about semaphores? When I just do configure, PostgreSQL
>>> seems to use SysV semaphores. But POSIX semaphore implementation
> is
>>> prepared in src/backend/port/posix_sema.c. Why isn't it used by
>>> default? Does it have any problem?
>>>
>>
>> Either way, Essentially, no one is running out of shared memory due
>> to semaphores.
>> In this case, semaphore usage is unrelated to shared memory
>> shortages.
>
> Yes, of course, shared memory is not related to semaphores.
>
>> Also, on many platforms the posix_sema's code is used.
>
> Really? When I run 'configure' without any parameter on Red Hat
> Enterprise Linux 4.0 (kernel 2.6.x), PostgreSQL uses SysV semaphores.
> I confirmed that by seeing the result of 'ipcs -u'. What platforms is
> POSIX sema used by PostgreSQL by default?
>
>
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