lock file question

Rusty Russell rusty at au1.ibm.com
Tue Nov 4 12:39:27 EST 2003

In message <1067895134.13400.26.camel at verve> you write:
> As part of a new RTAS interface, I'm writing a library that needs to
> manage mmap() use of a phys mem region in /dev/mem/.  If library user B
> requires an mmap()'ed buffer of a subset of this memory, then the
> library should ensure that it does not hand out a region being used by
> library user A.
> The current plan is to create a lock file "/var/lock/LCK..librtas", and
> use byte-range locks to manage the use of buffers that fall within this
> region.

Yep, that's the most sane idea.  You don't need to use ranges at all
though, since there's little point in having more than one user at a
time, even when it's possible.

  Anyone who quotes me in their sig is an idiot. -- Rusty Russell.

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