Alan Cox wrote:
>> structures are concerned. Something should probably be done with
>> blocking accesses to files, i.e. if one thread is read()ing from a file
>> descriptor which another wants to close, the first should get a signal or
>> something.
>
>Bumping the count as suggested elsewhere is a much more elegant, scalable
>and self locking answer.
>
Depends on what you want to do. For files at least, I'd want the file
descriptor to be closed, period. This means that if thread A reads from the
modem and thread B wants to close things down, thread B close()s the file
and A notices this somehow (EOF, signal, whatever).
Memory mappings can of course use counters, but you'd have to add the
appropriate unlock calls to every procedure which uses verify_area.
This is probably something that should have been done from the beginning...
-- Matrix Technicians do it in relays-- Matthias Urlichs \ noris network GmbH / Xlink-POP Nürnberg Schleiermacherstraße 12 \ Linux+Internet / EMail: urlichs@noris.de 90491 Nürnberg (Germany) \ Consulting+Programming+Networking+etc'ing PGP: 1024/4F578875 1B 89 E2 1C 43 EA 80 44 15 D2 29 CF C6 C7 E0 DE Click <A HREF="http://info.noris.de/~smurf/finger">here</A>. 42