diff options
Diffstat (limited to 'nptl/pthread_mutex_timedlock.c')
| -rw-r--r-- | nptl/pthread_mutex_timedlock.c | 31 |
1 files changed, 29 insertions, 2 deletions
diff --git a/nptl/pthread_mutex_timedlock.c b/nptl/pthread_mutex_timedlock.c index 8efc422042..1cd2c7e606 100644 --- a/nptl/pthread_mutex_timedlock.c +++ b/nptl/pthread_mutex_timedlock.c @@ -1,4 +1,4 @@ -/* Copyright (C) 2002, 2003 Free Software Foundation, Inc. +/* Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. @@ -73,10 +73,37 @@ pthread_mutex_timedlock (mutex, abstime) default: /* Correct code cannot set any other type. */ case PTHREAD_MUTEX_TIMED_NP: - case PTHREAD_MUTEX_ADAPTIVE_NP: + simple: /* Normal mutex. */ result = lll_mutex_timedlock (mutex->__data.__lock, abstime); break; + + case PTHREAD_MUTEX_ADAPTIVE_NP: + if (! __is_smp) + goto simple; + + if (lll_mutex_trylock (mutex->__data.__lock) != 0) + { + int cnt = 0; + int max_cnt = MIN (MAX_ADAPTIVE_COUNT, + mutex->__data.__spins * 2 + 10); + do + { + if (cnt++ >= max_cnt) + { + result = lll_mutex_timedlock (mutex->__data.__lock, abstime); + break; + } + +#ifdef BUSY_WAIT_NOP + BUSY_WAIT_NOP; +#endif + } + while (lll_mutex_trylock (mutex->__data.__lock) != 0); + + mutex->__data.__spins += (cnt - mutex->__data.__spins) / 8; + } + break; } if (result == 0) |