> > Did you ever consider remove per-backend semaphores at all?
> > We use them to sleep waiting for lock (ie when someone awake
> > us by changing our semaphore) - why don't use sigpause and
> > some signal?
>
> That'll fail if the signal arrives before the sigpause(), no?
Ops, you're right.
> > Semaphores are good to sync access to *shared*
> > resources but it's not that case here.
>
> The thing we really need here is that the right thing has to happen
> if the V() occurs before our P(), ie, the V() has to be remembered
> so that we will fall through the P() without blocking.
>
> What I'd like to look at sometime soon is using POSIX semaphores
> instead of SysV semaphores. But we need stateful semaphores,
> not signals.
Conditional variables seem to be more portable - recently I had to
rewrite some program with POSIX sem developed under Solaris when
porting to AIX. (BTW, OmniORB uses cond vars to simulate semaphores).
Vadim
