| From: | ocie(at)paracel(dot)com |
|---|---|
| To: | maillist(at)candle(dot)pha(dot)pa(dot)us (Bruce Momjian) |
| Cc: | ocie(at)paracel(dot)com, hackers(at)postgreSQL(dot)org |
| Subject: | Re: [HACKERS] mmap and MAP_ANON |
| Date: | 1998-05-12 20:24:21 |
| Message-ID: | 9805122024.AA05253@dolomite.paracel.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
Bruce Momjian wrote:
>
> >
> > Bruce Momjian wrote:
> > >
> > > Would people tell me what platforms do NOT support the MAP_ANON flag to
> > > the mmap() system call? You should find it in the mmap() manual page.
> >
> > Doesn't seem to appear in Linux (2.0.30 kernel). As another poster
> > commented, /dev/zero can be mapped for anonymous memory.
> >
>
> OK, who doesn't have /dev/zero?
I have been playing around with mmap on Linux. I have been unable to
mmap /dev/zero or to use MAP_ANON in conjunction with MAP_SHARED.
There is no problem sharing memory when a real file is used.
Solaris-sparc seems to have no trouble sharing memory mapped from
/dev/zero. Very strange.
Ocie
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