jeff 2007-06-04 23:51:44 UTC FreeBSD src repository
Modified files: sys/kern kern_mutex.c kern_rwlock.c subr_turnstile.c sys/sys turnstile.h Log: Commit 3/14 of sched_lock decomposition. - Add a per-turnstile spinlock to solve potential priority propagation deadlocks that are possible with thread_lock(). - The turnstile lock order is defined as the exact opposite of the lock order used with the sleep locks they represent. This allows us to walk in reverse order in priority_propagate and this is the only place we wish to multiply acquire turnstile locks. - Use the turnstile_chain lock to protect assigning mutexes to turnstiles. - Change the turnstile interface to pass back turnstile pointers to the consumers. This allows us to reduce some locking and makes it easier to cancel turnstile assignment while the turnstile chain lock is held. Tested by: kris, current@ Tested on: i386, amd64, ULE, 4BSD, libthr, libkse, PREEMPTION, etc. Discussed with: kris, attilio, kmacy, jhb, julian, bde (small parts each) Revision Changes Path 1.191 +122 -27 src/sys/kern/kern_mutex.c 1.26 +28 -26 src/sys/kern/kern_rwlock.c 1.168 +149 -135 src/sys/kern/subr_turnstile.c 1.12 +6 -4 src/sys/sys/turnstile.h _______________________________________________ cvs-all@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/cvs-all To unsubscribe, send any mail to "[EMAIL PROTECTED]"