On 30 Apr 1998, James Turner wrote:
> > Well, how to detect when is the shared memory not valid? Set a dirty flag
> > each time before modifying it and clear it afterwards?
>
> Nah, detect it bad by crashing. It would break the crash
I crash more often than reboot :)
> loops... however, more subtle corruption issues might not be so easily
> avoided. Setting a bit would work fine as well. Can mprotect be used
> on shared memory regions?
I'm not sure - but you can detach yourself from the memory and reattach
the segment read-only. Would be slow.
> > What I do BTW, is to have functions to acquire a "named" data area in the
> > shared memory and use that as the list head for something like notes etc.
>
> I've never used any of the shm* functions before, and as I mentioned,
> my APUE got purloined long ago. Can you post some sample code, or
> perhaps a url to more information? The man pages are somewhat lacking
> in explaining general use (though very detailed in the myriad of options).
I'm going to mail the code to James and Mark. It's C++ if anyone wants it.
> > PS: Anyone know what Descriptor::._53::~._53(void) is supposed to be? nm
> > will not demangle it, and I have an undefined reference to it, and I can't
> > locate the demangling reference for gcc - the unmangled name is
> > _._Q210Descriptor4._53.
>
> No idea on this one. Maybe revert a version, see what was changed?
> Looks like a destructor of some sorts, but I assume you already knew
> that.
It happened to be a missing destructor for a nested untyped structure
inside a class that had inside it a templated Array of pionteres to
another class :) Apparently, an explicit destructor was required.
=============================================================================
Erwin Andreasen Herlev, Denmark <erwin@pip.dknet.dk> UNIX System Programmer
<URL:http://www.abandoned.org/drylock/> <*> (not speaking for) DDE
=============================================================================
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