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2004-06-03  Ulrich Drepper  <drepper@redhat.com>

	* sysdeps/i386/i486/bits/atomic.h: Optimize a bit.
This commit is contained in:
Ulrich Drepper
2004-06-03 16:04:11 +00:00
parent 322861e8b6
commit 75fcceded2
30 changed files with 327 additions and 209 deletions
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28
nptl/sysdeps/pthread/pthread_cond_wait.c
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@@ -52,20 +52,14 @@ __condvar_cleanup (void *arg)
appropriately. */
++cbuffer->cond->__data.__wakeup_seq;
++cbuffer->cond->__data.__woken_seq;
++cbuffer->cond->__data.__futex;
}
/* We are done. */
lll_mutex_unlock (cbuffer->cond->__data.__lock);
/* Wake everybody to make sure no condvar signal gets lost. */
#if BYTE_ORDER == LITTLE_ENDIAN
int *futex = ((int *) (&cbuffer->cond->__data.__wakeup_seq));
#elif BYTE_ORDER == BIG_ENDIAN
int *futex = ((int *) (&cbuffer->cond->__data.__wakeup_seq)) + 1;
#else
# error "No valid byte order"
#endif
lll_futex_wake (futex, INT_MAX);
lll_futex_wake (&cbuffer->cond->__data.__futex, INT_MAX);
/* Get the mutex before returning unless asynchronous cancellation
is in effect. */
@@ -95,6 +89,7 @@ __pthread_cond_wait (cond, mutex)
/* We have one new user of the condvar. */
++cond->__data.__total_seq;
++cond->__data.__futex;
/* Remember the mutex we are using here. If there is already a
different address store this is a bad user bug. Do not store
@@ -118,27 +113,18 @@ __pthread_cond_wait (cond, mutex)
/* Remember the broadcast counter. */
cbuffer.bc_seq = cond->__data.__broadcast_seq;
/* The futex syscall operates on a 32-bit word. That is fine, we
just use the low 32 bits of the sequence counter. */
#if BYTE_ORDER == LITTLE_ENDIAN
int *futex = ((int *) (&cond->__data.__wakeup_seq));
#elif BYTE_ORDER == BIG_ENDIAN
int *futex = ((int *) (&cond->__data.__wakeup_seq)) + 1;
#else
# error "No valid byte order"
#endif
do
{
unsigned int futex_val = cond->__data.__futex;
/* Prepare to wait. Release the condvar futex. */
lll_mutex_unlock (cond->__data.__lock);
/* Enable asynchronous cancellation. Required by the standard. */
cbuffer.oldtype = __pthread_enable_asynccancel ();
/* Wait until woken by signal or broadcast. Note that we
truncate the 'val' value to 32 bits. */
lll_futex_wait (futex, (unsigned int) val);
/* Wait until woken by signal or broadcast. */
lll_futex_wait (&cond->__data.__futex, futex_val);
/* Disable asynchronous cancellation. */
__pthread_disable_asynccancel (cbuffer.oldtype);