cvs commit: src/sys/kern kern_umtx.c src/sys/sys umtx.h
nate at root.org
Mon Mar 31 17:34:21 PST 2003
On Mon, 31 Mar 2003, Jeff Roberson wrote:
> Added files:
> sys/kern kern_umtx.c
> sys/sys umtx.h
> - Add an api for doing smp safe locks in userland.
> - umtx_lock() is defined as an inline in umtx.h. It tries to do an
> uncontested acquire of a lock which falls back to the _umtx_lock()
> system-call if that fails.
> - umtx_unlock() is also an inline which falls back to _umtx_unlock() if the
> uncontested unlock fails.
> - Locks are keyed off of the thr_id_t of the currently running thread which
> is currently just the pointer to the 'struct thread' in kernel.
> - _umtx_lock() uses the proc pointer to synchronize access to blocked thread
> queues which are stored in the first blocked thread.
> Revision Changes Path
> 1.1 +303 -0 src/sys/kern/kern_umtx.c (new)
> 1.1 +87 -0 src/sys/sys/umtx.h (new)
It's great to be getting this. Can you point me to a document indicating
how this will be used by KSE? Are we going to have "native threads"
(thr), KSE, and pthreads?
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