first patch for process-shared semaphore

[Alexander Kabaev]

On Wed, 23 Dec 2009 09:49:53 +0800
David Xu <davidxu at freebsd.org> wrote:

> This is my first attempt to make process-shared mutex work, this means
> you can mmap(MAP_SHARED) a memory area, and put semaphore there,
> or you can sem_open a named semaphore, and just use it between
> processes, the named semaphore uses file system and mmap(), directory 
> /tmp/.semaphore is used as IPC directory, any named semaphore
> locates in the directory. old semaphore implementation still exists
> to make it binary compatible, it uses symbol version.
> 
> http://people.freebsd.org/~davidxu/patch/shared_semaphore_1.patch
> 
> 
> David Xu
> 
> _______________________________________________
> freebsd-threads at freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-threads
> To unsubscribe, send any mail to
> "freebsd-threads-unsubscribe at freebsd.org"

Hi,

is libthr really required for semaphores? Semaphore API seem
orthogonal to pthreads. None of the man pages on OpenGroup size
indicate where these belong, but they put sem_open & friends into
REALTIME group and Linux has them in librt.

-- 
Alexander Kabaev
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 188 bytes
Desc: not available
Url : http://lists.freebsd.org/pipermail/freebsd-threads/attachments/20091223/31777786/signature.pgp