On Thu, 30 Aug 2001 13:42:05 +1000, Stephen Robert Norris <[EMAIL PROTECTED]> said:

>I'd be interested to know how to avoid that. I'm pretty sure I can
>construct a scenario (with multiple threads and memory mapping, for
>example) where it's impossible to tell until you get the SEGV. For
>instance, I memory map a file, pass a pointer into the mapped region
>into the library and then unmap it some time later from another
>thread.

>Even if the library were checking (and I'm not sure how it could)
>that the pointer points to valid address space, there will be a time
>gap between the check and the use, and my unmapping can get in there.

>Having the library install its' own signal handler is not an
>acceptable solution, either.

Sounds like a fundamental problem with the UNIX environment design,
then.

Kelly
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