Re: Why use " != " - Mailing list pgsql-hackers

From Gurjeet Singh
Subject Re: Why use " != "
Date
Msg-id 65937bea0605152036y70246e17k40091e89a332836b@mail.gmail.com
Whole thread Raw
In response to Why use " != "  ("ipig" <ipig@ercist.iscas.ac.cn>)
List pgsql-hackers
    It done so, because InitProcess() is supposed to be called only
once per backend, because it allocates a PGPROC from a LIST OF free
PGPROCs.
   So with this test, and calling elog( ERROR, ... ) we are stopping
the caller from doing a second initialization for this backend.

On 5/16/06, ipig <ipig@ercist.iscas.ac.cn> wrote:
>
>
> Hi,
>
>    in postgresql-8.1.3/src/backend/storage/lmgr/proc.c
>    there are 2 function InitProcess and InitDummyProcess, both use
> " if (MyProc != NULL)
>      elog(ERROR, "you already exist");  " (line 215 and 315)
>
>    why use " != " ?
>
> Best regards.
>
>


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