On Mon, Mar 26, 2001 at 07:12:55PM +0200, Manfred Spraul wrote:
> > > That doesn't work, at least the i386 semaphore implementation
> doesn't
> > > support semaphore counts < 0.
> >
> > Does that mean that kernel semaphore can not be used for something
> > else than mutual exclusion ?
> >
> It's
From: "Stelian Pop" <[EMAIL PROTECTED]>
> >
> > That doesn't work, at least the i386 semaphore implementation
doesn't
> > support semaphore counts < 0.
>
> Does that mean that kernel semaphore can not be used for something
> else than mutual exclusion ?
>
It's a bit better: counts >= 0 are support
On Fri, Mar 23, 2001 at 03:52:54PM -0800, Nigel Gamble wrote:
> For the producer/consumer case, you want to initialize the semaphore to
> 0, not 1 which DECLARE_MUTEX(sem) does. So I would use
>
> __DECLARE_SEMAPHORE_GENERIC(sem, 0)
You're right that the DECLARE_MUTEX does not (entirely) do th
On Fri, Mar 23, 2001 at 07:34:07PM +0100, Manfred Spraul wrote:
> > consumer()
>
> > /* Let's wait for 10 items */
> > atomic_set(&sem->count, -10);
>
> That doesn't work, at least the i386 semaphore implementation doesn't
> support semaphore counts < 0.
Does that m
On Fri, 23 Mar 2001, Stelian Pop wrote:
> I want to use a semaphore for the classic producer/consumer case
> (put the consumer to wait until X items are produced, where X != 1).
>
> If X is 1, the semaphore is a simple MUTEX, ok.
>
> But if the consumer wants to wait for several items, it doesn'
> consumer()
> /* Let's wait for 10 items */
> atomic_set(&sem->count, -10);
That doesn't work, at least the i386 semaphore implementation doesn't
support semaphore counts < 0.
--
Manfred
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Hi,
I want to use a semaphore for the classic producer/consumer case
(put the consumer to wait until X items are produced, where X != 1).
If X is 1, the semaphore is a simple MUTEX, ok.
But if the consumer wants to wait for several items, it doesn't
seem to work (or something is bad in my code
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