Messages in this thread | | | Date | Sat, 2 Mar 2002 14:54:53 +0000 | From | Pavel Machek <> | Subject | Re: [PATCH] Lightweight userspace semaphores... |
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Hi!
> > > sys_sem_create() > > > sys_sem_destroy() > > > > There is no create and destroy (init is purely userspace). There is > > "this is a semapore: up it". This is a feature. > > No, that's a bug. > > You have to realize that there are architectures that need special > initialization and page allocation for semaphores: they need special flags > in the TLB for "careful access", for example (sometimes the careful access > ends up being non-cached).
Your user part is arch-dependend, anyway. So it can just mmap(..., O_CAREFULL).
Pavel
-- Philips Velo 1: 1"x4"x8", 300gram, 60, 12MB, 40bogomips, linux, mutt, details at http://atrey.karlin.mff.cuni.cz/~pavel/velo/index.html.
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