On Fri, 13 Apr 2007 01:54:28 +0000 (GMT) <[email protected]> wrote:
> 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?
>
Robust futexes: http://lwn.net/Articles/172149/
But I don't know whether RH backported them into RHEL4.
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