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* pthreadP.h (PTHREAD_RWLOCK_PREFER_READER_P): Define.

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* pthread_rwlock_rdlock.c: Use PTHREAD_RWLOCK_PREFER_READER_P.
	* pthread_rwlock_timedrdlock.c: Likewise.
	* pthread_rwlock_tryrdlock.c: Likewise.
This commit is contained in:
Ulrich Drepper 2007-05-26 22:11:42 +00:00
parent a2dd3360db
commit 546346b6f8
5 changed files with 16 additions and 6 deletions
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5
nptl/ChangeLog
View file

@ -1,5 +1,10 @@
2007-05-26 Ulrich Drepper <drepper@redhat.com>
* pthreadP.h (PTHREAD_RWLOCK_PREFER_READER_P): Define.
* pthread_rwlock_rdlock.c: Use PTHREAD_RWLOCK_PREFER_READER_P.
* pthread_rwlock_timedrdlock.c: Likewise.
* pthread_rwlock_tryrdlock.c: Likewise.
* sysdeps/unix/sysv/linux/x86_64/sem_trywait.S (sem_trywait): Tiny
optimization.

5
nptl/pthreadP.h
View file

@ -118,6 +118,11 @@ enum
| PTHREAD_MUTEXATTR_PROTOCOL_MASK | PTHREAD_MUTEXATTR_PRIO_CEILING_MASK)
/* Check whether rwlock prefers readers. */
#define PTHREAD_RWLOCK_PREFER_READER_P(rwlock) \
((rwlock)->__data.__flags == 0)
/* Bits used in robust mutex implementation. */
#define FUTEX_WAITERS 0x80000000
#define FUTEX_OWNER_DIED 0x40000000

4
nptl/pthread_rwlock_rdlock.c
View file

@ -1,4 +1,4 @@
/* Copyright (C) 2003, 2004 Free Software Foundation, Inc.
/* Copyright (C) 2003, 2004, 2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Martin Schwidefsky <schwidefsky@de.ibm.com>, 2003.
@ -40,7 +40,7 @@ __pthread_rwlock_rdlock (rwlock)
if (rwlock->__data.__writer == 0
/* ...and if either no writer is waiting or we prefer readers. */
&& (!rwlock->__data.__nr_writers_queued
|| rwlock->__data.__flags == 0))
|| PTHREAD_RWLOCK_PREFER_READER_P (rwlock)))
{
/* Increment the reader counter. Avoid overflow. */
if (__builtin_expect (++rwlock->__data.__nr_readers == 0, 0))

4
nptl/pthread_rwlock_timedrdlock.c
View file

@ -1,4 +1,4 @@
/* Copyright (C) 2003, 2004 Free Software Foundation, Inc.
/* Copyright (C) 2003, 2004, 2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Martin Schwidefsky <schwidefsky@de.ibm.com>, 2003.
@ -43,7 +43,7 @@ pthread_rwlock_timedrdlock (rwlock, abstime)
if (rwlock->__data.__writer == 0
/* ...and if either no writer is waiting or we prefer readers. */
&& (!rwlock->__data.__nr_writers_queued
|| rwlock->__data.__flags == 0))
|| PTHREAD_RWLOCK_PREFER_READER_P (rwlock)))
{
/* Increment the reader counter. Avoid overflow. */
if (++rwlock->__data.__nr_readers == 0)

4
nptl/pthread_rwlock_tryrdlock.c
View file

@ -1,4 +1,4 @@
/* Copyright (C) 2002 Free Software Foundation, Inc.
/* Copyright (C) 2002, 2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
@ -32,7 +32,7 @@ __pthread_rwlock_tryrdlock (rwlock)
if (rwlock->__data.__writer == 0
&& (rwlock->__data.__nr_writers_queued == 0
|| rwlock->__data.__flags == 0))
|| PTHREAD_RWLOCK_PREFER_READER_P (rwlock)))
{
if (__builtin_expect (++rwlock->__data.__nr_readers == 0, 0))
{