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+2004-09-27 Ross Johnson <rpj at callisto.canberra.edu.au>
+
+ * pthread_mutex_lock.c (pthread_mutex_lock): Separate PTHREAD_MUTEX_NORMAL
+ logic since we do not need to keep or check some state required by other
+ mutex types; do not check mutex pointer arg for validity - leave this to
+ the system since we are only checking for NULL pointers. This should improve
+ speed of NORMAL mutexes and marginally improve speed of other type.
+ * pthread_mutex_trylock.c (pthread_mutex_trylock): Likewise.
+ * pthread_mutex_unlock.c (pthread_mutex_unlock): Likewise; also avoid
+ entering the critical section for the no-waiters case, with approx. 30%
+ reduction in lock/unlock overhead for this case..
+ * pthread_mutex_timedlock.c (pthread_mutex_timedlock): Likewise; also
+ no longer keeps mutex if post-timeout second attempt succeeds - this will
+ assist applications that wish to impose strict lock deadlines, rather than
+ simply to escape from frozen locks.
+
2004-09-09 Tristan Savatier <tristan at mpegtv.com>
- * pthread.h (struct pthread_once_t_): Qualify the 'done' element
- as 'volatile'.
- * pthread_once.c: Concerned about possible race condition,
- specifically on MPU systems re concurrent access to multibyte types.
- [Maintainer's note: the race condition is harmless on SPU systems
- and only a problem on MPU systems if concurrent access results in an
- exception (presumably generated by a hardware interrupt). There are
- other instances of similar harmless race conditions that have not been
- identified as issues.]
+ * pthread.h (struct pthread_once_t_): Qualify the 'done' element
+ as 'volatile'.
+ * pthread_once.c: Concerned about possible race condition,
+ specifically on MPU systems re concurrent access to multibyte types.
+ [Maintainer's note: the race condition is harmless on SPU systems
+ and only a problem on MPU systems if concurrent access results in an
+ exception (presumably generated by a hardware interrupt). There are
+ other instances of similar harmless race conditions that have not been
+ identified as issues.]
2004-09-09 Ross Johnson <rpj at callisto.canberra.edu.au>
- * pthread.h: Declare additional types as volatile.
+ * pthread.h: Declare additional types as volatile.
2004-08-27 Ross Johnson <rpj at callisto.canberra.edu.au>
- * pthread_barrier_wait.c (pthread_barrier_wait): Remove excessive code
- by substituting the internal non-cancelable version of sem_wait
- (ptw32_semwait).
+ * pthread_barrier_wait.c (pthread_barrier_wait): Remove excessive code
+ by substituting the internal non-cancelable version of sem_wait
+ (ptw32_semwait).
2004-08-25 Ross Johnson <rpj at callisto.canberra.edu.au>