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Re: vacuum as flags in PGPROC

From: Alvaro Herrera <alvherre(at)commandprompt(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Patches <pgsql-patches(at)postgresql(dot)org>
Subject: Re: vacuum as flags in PGPROC
Date: 2007-10-24 14:13:10
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-patches
Tom Lane wrote:
> Alvaro Herrera <alvherre(at)commandprompt(dot)com> writes:
> > In the spirit of incremental improvement, here is a patch that turns the
> > couple of bools in PGPROC into a bitmask, and associated fallout.
> Maybe declare the field as uint8 instead of char?  Otherwise, +1.

I'm wondering if it's safe to do something like

MyProc->vacuumFlags |= PROC_FOR_XID_WRAPAROUND

without holding the ProcArrayLock.  It seems in practice a type smaller
than "int" (which uint8 always is) is always stored atomically so this
shouldn't be a problem.

Alvaro Herrera                     
"La rebeldía es la virtud original del hombre" (Arthur Schopenhauer)

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