1 /* Copyright (C) 2002, 2003 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
77 movq %r10, %rsi /* movq $FUTEX_WAIT, %rsi */
81 subq $READERS_WAKEUP, %rdi
90 cmpxchgl %esi, MUTEX(%rdi)
94 13: decl READERS_QUEUED(%rdi)
116 callq __lll_mutex_lock_wait
122 14: cmpl %fs:TID, %eax
124 /* Deadlock detected. */
132 callq __lll_mutex_unlock_wake
139 8: decl NR_READERS(%rdi)
144 4: decl READERS_QUEUED(%rdi)
152 callq __lll_mutex_unlock_wake
162 callq __lll_mutex_lock_wait
167 .size __pthread_rwlock_rdlock,.-__pthread_rwlock_rdlock
169 .globl pthread_rwlock_rdlock
170 pthread_rwlock_rdlock = __pthread_rwlock_rdlock
172 .globl __pthread_rwlock_rdlock_internal
173 __pthread_rwlock_rdlock_internal = __pthread_rwlock_rdlock