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2000-06-13 Kaz Kylheku <kaz@ashi.footprints.net> A few optimizations. Got rid of unnecessary wakeups of timer threads, tightened up some critical regions and micro-optimized some list manipulation code. * sysdeps/pthread/timer_routines.c (__timer_thread_queue_timer): Returns int value now to indicate whether timer was queued at head. * sysdeps/pthread/posix-timer.h: Likewise. * sysdeps/pthread/timer_settime.c (timer_settime): Takes advantage of new return value from __timer_thread_queue_timer to avoid waking up timer thread unnecessarily. * sysdeps/pthread/posix-timer.h (timer_id2ptr): No longer checks inuse flag, because this requires mutex to be held. Callers updated to do the check when they have the mutex. * sysdeps/pthread/timer_getoverr.c: Add check for inuse here. * sysdeps/pthread/timer_settime.c (timer_settime): Tighter critical regions: avoids making system calls while holding timer mutex, and a few computations were moved outside of the mutex as well. * sysdeps/pthread/timer_gettime.c (timer_gettime): Likewise. * sysdeps/pthread/posix-timer.h (list_unlink_ip): Function name changed to list_unlink_ip, meaning idempotent. Pointer manipulation changed to get better better code out of gcc. * sysdeps/pthread/timer_routines.c (list_unlink): Non-idempotent version of list_unlink added here. * sysdeps/pthread/timer_delete.c: Use appropriate list unlink function in all places: idempotent one for timers, non-idempotent one for thread nodes. * sysdeps/pthread/timer_settime: Likewise. * sysdeps/pthread/timer_routines.c: Likewise. |
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