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From Peter Samuelson <pe...@p12n.org>
Subject Re: SHM / RMM pointer values
Date Wed, 20 Jun 2007 04:20:48 GMT

[Manfred Rebentisch]
> struct mystr {
> 	struct mystr* next;
> 	char* data;
> 	size_t dsize;
> };

I'm pretty sure you can't portably implement shared memory mapped to a
fixed base address in all processes.  Thus pointers simply _cannot_ be
shared as pointers, you need to make them size_t values relative to the
shm segment base address, or something.

On many systems you can _request_ that a shm segment be mapped to a
particular address, but the OS may or may not be able (and willing) to
honor that.  And on other systems you can't even do that.  So apr
doesn't support that feature.
Peter Samuelson | org-tld!p12n!peter | http://p12n.org/

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