Re: [PATCH][RFC] Lightweight user-level semaphores

[Manfred Spraul]

Matthew Kirkwood wrote:
> 
> 
> Yep, that'd be fine.  However, you then lose the neatness
> of "lock==file descriptor", and need something other than
> read/write for down/up.
> 
pread(), use the file pointer.

> 
> I guess the alternative is to store them in a hash table
> or tree but I don't know what that would do to the
> contended case.
>
I'd start with file descriptor+pread(), and then check how much faster
your could get without any protection at all (i.e. just trust user
space). If the difference is small, then use the file descriptor.

--
	Manfred