1 /* Copyright (C) 2003, 2007 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
20 #include <lowlevelrwlock.h>
21 #include <pthread-errnos.h>
22 #include <tcb-offsets.h>
23 #include <kernel-features.h>
24 #include "lowlevel-atomic.h"
29 #define FUTEX_PRIVATE_FLAG 128
34 .globl __pthread_rwlock_wrlock
35 .type __pthread_rwlock_wrlock,@function
37 __pthread_rwlock_wrlock:
48 CMPXCHG (r3, @r8, r4, r2)
50 CMPXCHG (r3, @(MUTEX,r8), r4, r2)
54 mov.l @(WRITER,r8), r0
57 mov.l @(NR_READERS,r8), r0
61 mov.l @(WRITERS_QUEUED,r8), r0
63 mov.l r0, @(WRITERS_QUEUED,r8)
67 mov.l @(WRITERS_WAKEUP,r8), r9
78 add #WRITERS_WAKEUP, r4
79 #if __ASSUME_PRIVATE_FUTEX
82 mov #(FUTEX_PRIVATE_FLAG|FUTEX_WAIT), r0
106 /* Reget the lock. */
110 CMPXCHG (r3, @r8, r4, r2)
112 CMPXCHG (r3, @(MUTEX,r8), r4, r2)
116 mov.l @(WRITERS_QUEUED,r8), r0
119 mov.l r0, @(WRITERS_QUEUED,r8)
126 mov.l r0, @(WRITER,r8)
131 DEC (@(MUTEX,r8), r2)
176 #if !__ASSUME_PRIVATE_FUTEX
178 .word PRIVATE_FUTEX - TLS_PRE_TCB_SIZE
181 .word TID - TLS_PRE_TCB_SIZE
184 mov.l @(WRITERS_QUEUED,r8), r1
186 mov.l r1, @(WRITERS_QUEUED,r8)
217 .long __lll_mutex_lock_wait-.Lwait4b
219 .long __lll_mutex_unlock_wake-.Lwake4b
221 .long __lll_mutex_lock_wait-.Lwait5b
223 .long __lll_mutex_unlock_wake-.Lwake5b
224 .globl pthread_rwlock_wrlock
225 pthread_rwlock_wrlock = __pthread_rwlock_wrlock
227 .globl __pthread_rwlock_wrlock_internal
228 __pthread_rwlock_wrlock_internal = __pthread_rwlock_wrlock