Re: Why use " != "
От | ipig |
---|---|
Тема | Re: Why use " != " |
Дата | |
Msg-id | 007c01c6789a$ce5e2190$8c01a8c0@homepig обсуждение исходный текст |
Ответ на | Why use " != " ("ipig" <ipig@ercist.iscas.ac.cn>) |
Список | pgsql-hackers |
As Qingqing Zhou said, i misread "exist". Thanks. ----- Original Message ----- From: "Gurjeet Singh" <singh.gurjeet@gmail.com> To: "ipig" <ipig@ercist.iscas.ac.cn> Cc: <pgsql-hackers@postgresql.org> Sent: Tuesday, May 16, 2006 11:36 AM Subject: Re: [HACKERS] Why use " != " 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. > > ---------------------------(end of broadcast)--------------------------- TIP 2: Don't 'kill -9' the postmaster
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