Messages in this thread | | | Date | Sun, 24 Feb 2002 15:48:58 -0800 (PST) | From | Linus Torvalds <> | Subject | Re: [PATCH] Lightweight userspace semaphores... |
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On Mon, 25 Feb 2002, Rusty Russell wrote: > > > > 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).
You can't just put semaphores anywhere and tell the kernel to try to fix up whatever happened.
Linus
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