Date: Wed, 2 Jul 2003 09:14:09 -0700 (PDT) From: John Baldwin <jhb@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/kern kern_mutex.c Message-ID: <200307021614.h62GE9Ud033253@repoman.freebsd.org>
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jhb 2003/07/02 09:14:09 PDT
FreeBSD src repository
Modified files:
sys/kern kern_mutex.c
Log:
- Add comments about the maintenance of the per-thread list of contested
locks held by each thread.
- Fix a bug in the original BSD/OS code where a contested lock was not
properly handed off from the old thread to the new thread when a
contested lock with more than one blocked thread was transferred from
one thread to another.
- Don't use an atomic operation to write the MTX_CONTESTED value to
mtx_lock in the aforementioned special case. The memory barriers and
exclusion provided by sched_lock are sufficient.
Spotted by: alc (2)
Revision Changes Path
1.129 +9 -4 src/sys/kern/kern_mutex.c
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