Обсуждение: Linux: semaphores: How?

Hi all

I'm now building up a new server, Red Hat 5.2 with updates and the new
2.2.2 kernel.

I may have missed it, but do not recall seeing any thing about semaphores
in the "make menuconfig", is it call some thing else? or is it N/A for
Linux? or did I just not see it?

I would like to build a kernel that can handle the future as I want to go
for a year of uptime (had 6months+ twice now.)


Thanks and have a great day
Terry Mackintosh <terry@terrym.com>               http://www.terrym.com
sysadmin/owner                  I'm excited about life! How about YOU!?
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Hi!

On Thu, 25 Feb 1999, Terry Mackintosh wrote:
> I'm now building up a new server, Red Hat 5.2 with updates and the new
> 2.2.2 kernel.
> 
> I may have missed it, but do not recall seeing any thing about semaphores
> in the "make menuconfig", is it call some thing else? or is it N/A for
> Linux? or did I just not see it?
  It is "System V IPC".

Oleg.
----    Oleg Broytmann  National Research Surgery Centre  http://sun.med.ru/~phd/          Programmers don't die, they
justGOSUB without RETURN.
 

The defaults for RH5.2 (from /usr/src/linux/include/linux/sem.h:

#define SEMMNI  128             /* ?  max # of semaphore identifiers
*/
#define SEMMSL  32              /* <= 512 max num of semaphores per
id */
#define SEMMNS  (SEMMNI*SEMMSL) /* ? max # of semaphores in system
*/
#define SEMOPM  32              /* ~ 100 max num of ops per semop
call */
#define SEMVMX  32767           /* semaphore maximum value */

Which means the default max semaphores is 128*32 = 4096, I don't
think you'll have a problem. :)

DwD

> -----Original Message-----
> From: owner-pgsql-hackers@postgreSQL.org
> [mailto:owner-pgsql-hackers@postgreSQL.org]On Behalf Of
> Oleg Broytmann
> Sent: Thursday, February 25, 1999 12:42 PM
> To: Terry Mackintosh
> Cc: PostgreSQL-development
> Subject: Re: [HACKERS] Linux: semaphores: How?
>
>
> Hi!
>
> On Thu, 25 Feb 1999, Terry Mackintosh wrote:
> > I'm now building up a new server, Red Hat 5.2 with
> updates and the new
> > 2.2.2 kernel.
> >
> > I may have missed it, but do not recall seeing any
> thing about semaphores
> > in the "make menuconfig", is it call some thing else?
> or is it N/A for
> > Linux? or did I just not see it?
>
>    It is "System V IPC".
>
> Oleg.
> ----
>     Oleg Broytmann  National Research Surgery Centre
> http://sun.med.ru/~phd/
>            Programmers don't die,
> they just GOSUB without RETURN.
>
>

I was trying to 'rename' a column
during an inherit.  Since I could not
find a way to do this, I renamed
the column in a view, and then
I inherited from the view.

Anyway, I think being able
to inherit a view is a bug,
besides confusing the 
backend ... *evil grin*

Clark