Date: Mon, 4 Jun 2007 23:51:44 +0000 (UTC) From: Jeff Roberson <jeff@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/kern kern_mutex.c kern_rwlock.c subr_turnstile.c src/sys/sys turnstile.h Message-ID: <200706042351.l54Npid4074536@repoman.freebsd.org>
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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
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