Date: Fri, 5 Sep 2003 11:47:39 -0700 From: Wes Peters <wes@softweyr.com> To: Lev Walkin <vlm@netli.com>, zera holladay <zera_holladay@yahoo.com> Cc: hackers@freebsd.org Subject: Re: Shared memory question Message-ID: <200309051146.35868.wes@softweyr.com> In-Reply-To: <3F501A86.4010805@netli.com> References: <20030830025645.37066.qmail@web41408.mail.yahoo.com> <3F501A86.4010805@netli.com>
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On Friday 29 August 2003 20:31, Lev Walkin wrote:
> zera holladay wrote:
> > When one uses the term "shared memory" while
> > discussing Unix, then what is generally the meaning of
> > that term? I have read that some Unixes have "shared
> > memory" for "shared objects."
> > [...]
>
> Shared memory is just a chunk of memory which may be
> created by one program and attached to (by) many other programs.
> Yes, the management (allocation and deallocation) of shared
> memory chunks are done in kernel. User space applications
> have to use shmget(2), shmat(2), shmdt(2) system calls
> to obtain, attach and release the chunk of shared memory.
Or mmap(2) with the MAP_SHARED attribute set.
--
"Where am I, and what am I doing in this handbasket?"
Wes Peters wes@softweyr.com
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