Re: [PATCH] Lightweight userspace semaphores...

[Linus Torvalds]

On Mon, 25 Feb 2002, Alan Cox wrote:
> > > 	fd = open("/dev/shm/sem....");
> >
> > Hmm.. Yes. Except I would allow a NULL backing store name for the
> > normal(?) case of just wanting private anonymous memory.
>
> unlink()

Sure, but that, together with making up a unique temporary name etc just
adds extra overhead for no actual gain.

> > At the same time, I have to admit that I like the notion that Rusty had of
> > libraries being able to just put their semaphores anywhere (on the stack
> > etc), as it does work for many architectures. Ugh.
>
> _alloca
> mmap
>
> Still fits on the stack 8)

.. but is slow as hell.

		Linus