shared memory, arenas, and threads.

[karron at MCIRPS2.MED.NYU.EDU]

I am looking for more information on arenas. What are the issues in
using arenas vs shared memory ? How can I block a process untill another
does somthing required in shared memory ?

I am currently using shared memory, but find it somewhat buggy. I can start
one process, but not the other untill the first is started, even though they
should both create a shared memory segment. I started with the shared memory
demo in 4Dgifts. Are there any demos of arena. When would I use one and not
the other ?

dan.
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