Date: Mon, 31 Mar 2003 17:38:13 -0800 (PST) From: Julian Elischer <julian@elischer.org> To: Nate Lawson <nate@root.org> Cc: cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/kern kern_umtx.c src/sys/sys umtx.h Message-ID: <Pine.BSF.4.21.0303311736190.52134-100000@InterJet.elischer.org> In-Reply-To: <Pine.BSF.4.21.0303311732590.8310-100000@root.org>
next in thread | previous in thread | raw e-mail | index | archive | help
On Mon, 31 Mar 2003, Nate Lawson wrote: > On Mon, 31 Mar 2003, Jeff Roberson wrote: > > Added files: > > sys/kern kern_umtx.c > > sys/sys umtx.h > > Log: > > - 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? We will have 3 threads schemes.. userland threads thr threads.. Useable by the majority of threaded apps KSE threads.. Useable by threaded apps that have thousands of threads (i.e. KSE is a hybrid if userland and thr threads..) Julian
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?Pine.BSF.4.21.0303311736190.52134-100000>