CVS commit: src/lib/libpthread

[Andrew Doran <ad%netbsd.org@localhost>]

Module Name:    src
Committed By:   ad
Date:           Fri Sep  7 00:07:55 UTC 2007

Modified Files:
        src/lib/libpthread: pthread_lock.c

Log Message:
If a libpthread internal spinlock is held, nanosleep() for a tick instead of
yielding. This is a nasty band-aid but with many threads, looping over
sched_yield() wastes a huge amount of CPU time. It would be nice to have a
way to temporarily disable preemption, but it turns out that's yet another
no-brain concept that has been patented and the patent holder seems to be
suing people lately. Another alternative is probably to have kernel-assisted
spinlocks.


To generate a diff of this commit:
cvs rdiff -r1.24 -r1.25 src/lib/libpthread/pthread_lock.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.