Cheap lock for user mode processes releasewhen process exits

[mchu]

Hi all,

Maybe someone here knows better.

I have several user-mode processes using shared mmap.  There can be several reader processes and only one writer.  Readers access the shared region frequently, writer seldom.

Naturally, multi-reader/single-writer locks works best.  I tried this with futex on 2.6.9-42.EL.  However, if one of the processes is killed/exits, the lock doesn't get released.

I can trap the signal to release the lock, but not all signals like kill.

Anyway I can achieve this without a potential deadlock?

Thanks,
Michael
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