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SubjectRe: Process-Shared Mutex (futex) - What is it good for ?
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On Tue, 2002-06-11 at 15:19, Peter Wächtler wrote:

>
> A-prog: B-prog:
>
> gets write lock
> write some data
> block on read lock
> write some data
> crashes
> wants an error indication to repair data magically

B-Prog unblocks, but gets -1, with errno=EPIPE.

>
>
> So a crashing A-prog is OK for you, but B should get an indication.
> Could catch a signal (SIGLOST?) returning -1 with errno=LOCKBROKEN
> That would be possible with futex.

Nice if that *would* be possible. But that IS how nutexes are working
already.

> That is a case for writing data to a file - what about linked lists
> in memory?

Exactly the same. Nutexes are not related to files in any way (other
than /dev/nutex descriptor, but that's completly different thing).


--
Bye,

and have a very nice day !



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