On Tue, May 15, 2001 at 08:33:05PM -0700, dean gaudet wrote:
> On Tue, 15 May 2001, Andrea Arcangeli wrote:
>
> > o fixed race in wake-one LIFO in accept(2). Apache must be compiled with
> > -DSINGLE_LISTEN_UNSERIALIZED_ACCEPT to take advantage of that.
> >
> > 00_wake-one-4
> >
> > Backport 2.4 waitqueues and in turn fixes an hanging condition in accept(2).
> >
> > (me)
>
> apache since 1.3.15 has defined SINGLE_LISTEN_UNSERIALIZED_ACCEPT ...
That's definitely a good thing.
> 'cause that's what you guys asked me to do :) does this mean there are
> known hangs on linux 2.2.x without your fix?
I never heard of anybody reproducing that but accpet() in 2.2
can _definitely_ miss events without the above 00_wake-one-4 patch
because it wrongly considers a progress wakeing up two times the same
exclusive task.
Furthmore the exclusive wakeup logic with the exclusive information
per-task and not per wait_queue_t will screwup if the tasks registers
itself like a wakeall after it was just registered as wakeone somewhere
else (however this second thing is more a theorical issue that shouldn't
trigger in 2.2).
Andrea
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This archive was generated by hypermail 2b29 : Wed May 23 2001 - 21:00:17 EST