1 /* Copyright (C) 2002, 2003, 2005 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 <lowlevelrwlock.h>
22 #include <pthread-errnos.h>
38 .globl __pthread_rwlock_rdlock
39 .type __pthread_rwlock_rdlock,@function
41 __pthread_rwlock_rdlock:
51 cmpxchgl %esi, MUTEX(%rdi)
55 2: movl WRITER(%rdi), %eax
58 cmpl $0, WRITERS_QUEUED(%rdi)
63 3: incl READERS_QUEUED(%rdi)
66 movl READERS_WAKEUP(%rdi), %edx
76 11: addq $READERS_WAKEUP, %rdi
80 movl $FUTEX_WAIT, %esi
85 subq $READERS_WAKEUP, %rdi
94 cmpxchgl %esi, MUTEX(%rdi)
98 13: decl READERS_QUEUED(%rdi)
102 incl NR_READERS(%rdi)
120 callq __lll_mutex_lock_wait
126 14: cmpl %fs:TID, %eax
128 /* Deadlock detected. */
136 callq __lll_mutex_unlock_wake
143 8: decl NR_READERS(%rdi)
148 4: decl READERS_QUEUED(%rdi)
156 callq __lll_mutex_unlock_wake
166 callq __lll_mutex_lock_wait
171 .size __pthread_rwlock_rdlock,.-__pthread_rwlock_rdlock
173 .globl pthread_rwlock_rdlock
174 pthread_rwlock_rdlock = __pthread_rwlock_rdlock
176 .globl __pthread_rwlock_rdlock_internal
177 __pthread_rwlock_rdlock_internal = __pthread_rwlock_rdlock