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Don't do adaptive spinning if it is running on UP kernel.

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This commit is contained in:
David Xu 2007-10-31 01:44:50 +00:00
parent e8ef3c283b
commit 55f18e070f
1 changed files with 5 additions and 3 deletions
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8
lib/libthr/thread/thr_mutex.c
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@ -39,8 +39,6 @@
#include <string.h>
#include <sys/param.h>
#include <sys/queue.h>
#include <machine/cpu.h>
#include <machine/cpufunc.h>
#include <pthread.h>
#include "un-namespace.h"
@ -368,6 +366,9 @@ mutex_lock_common(struct pthread *curthread, pthread_mutex_t *mutex,
* the lock is likely to be released quickly and it is
* faster than entering the kernel
*/
if (!_thr_is_smp)
goto yield_loop;
if (m->m_type == PTHREAD_MUTEX_ADAPTIVE_NP) {
count = MUTEX_ADAPTIVE_SPINS;
@ -380,7 +381,7 @@ mutex_lock_common(struct pthread *curthread, pthread_mutex_t *mutex,
if (ret == 0)
goto done;
} else {
if (_thr_spinloops != 0 && _thr_is_smp &&
if (_thr_spinloops != 0 &&
!(m->m_lock.m_flags & UMUTEX_PRIO_PROTECT)) {
count = _thr_spinloops;
while (count) {
@ -395,6 +396,7 @@ mutex_lock_common(struct pthread *curthread, pthread_mutex_t *mutex,
}
}
yield_loop:
if (_thr_yieldloops != 0) {
count = _thr_yieldloops;
while (count--) {