1 /* Copyright (C) 2002, 2003, 2005, 2007 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
21 #include <lowlevellock.h>
22 #include <lowlevelrwlock.h>
23 #include <pthread-errnos.h>
24 #include <kernel-features.h>
29 .globl __pthread_rwlock_wrlock
30 .type __pthread_rwlock_wrlock,@function
32 __pthread_rwlock_wrlock:
42 cmpxchgl %esi, MUTEX(%rdi)
46 2: movl WRITER(%rdi), %eax
49 cmpl $0, NR_READERS(%rdi)
52 3: incl WRITERS_QUEUED(%rdi)
55 movl WRITERS_WAKEUP(%rdi), %edx
66 #ifdef __ASSUME_PRIVATE_FUTEX
67 movl $FUTEX_PRIVATE_FLAG|FUTEX_WAIT, %esi
68 xorl PSHARED(%rdi), %esi
71 movl PSHARED(%rdi), %esi
73 movl $FUTEX_WAIT, %esi
74 orl PSHARED(%rdi), %esi
76 xorl %fs:PRIVATE_FUTEX, %esi
78 addq $WRITERS_WAKEUP, %rdi
82 subq $WRITERS_WAKEUP, %rdi
91 cmpxchgl %esi, MUTEX(%rdi)
95 13: decl WRITERS_QUEUED(%rdi)
100 movl %eax, WRITER(%rdi)
113 1: movl PSHARED(%rdi), %esi
117 callq __lll_lock_wait
123 14: cmpl %fs:TID, %eax
128 6: movl PSHARED(%rdi), %esi
132 callq __lll_unlock_wake
135 4: decl WRITERS_QUEUED(%rdi)
139 10: movl PSHARED(%rdi), %esi
143 callq __lll_unlock_wake
149 12: movl PSHARED(%rdi), %esi
153 callq __lll_lock_wait
158 .size __pthread_rwlock_wrlock,.-__pthread_rwlock_wrlock
160 .globl pthread_rwlock_wrlock
161 pthread_rwlock_wrlock = __pthread_rwlock_wrlock
163 .globl __pthread_rwlock_wrlock_internal
164 __pthread_rwlock_wrlock_internal = __pthread_rwlock_wrlock