| From: | "Takayuki Tsunakawa" <tsunakawa(dot)takay(at)jp(dot)fujitsu(dot)com> |
|---|---|
| To: | "Chris Marcellino" <maps(at)levelview(dot)com> |
| Cc: | <pgsql-patches(at)postgresql(dot)org> |
| Subject: | Re: Feature: POSIX Shared memory support |
| Date: | 2007-02-07 04:32:17 |
| Message-ID: | 02f901c74a70$f2bd8e10$19527c0a@OPERAO |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-patches |
>> 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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