1 /* Copyright (C) 2002, 2003, 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 <lowlevelrwlock.h>
22 #include <pthread-errnos.h>
38 .globl __pthread_rwlock_wrlock
39 .type __pthread_rwlock_wrlock,@function
41 __pthread_rwlock_wrlock:
55 cmpxchgl %edx, MUTEX(%ebx)
59 2: movl WRITER(%ebx), %eax
62 cmpl $0, NR_READERS(%ebx)
65 3: addl $1, WRITERS_QUEUED(%ebx)
68 movl WRITERS_WAKEUP(%ebx), %edx
79 #if __ASSUME_PRIVATE_FUTEX
80 movzbl PSHARED(%ebx), %ecx
81 xorl $FUTEX_PRIVATE_FLAG|FUTEX_WAIT, %ecx
83 movzbl PSHARED(%ebx), %ecx
87 xorl %gs:PRIVATE_FUTEX, %ecx
89 addl $WRITERS_WAKEUP, %ebx
93 subl $WRITERS_WAKEUP, %ebx
100 cmpxchgl %edx, (%ebx)
102 cmpxchgl %edx, MUTEX(%ebx)
106 13: subl $1, WRITERS_QUEUED(%ebx)
111 movl %eax, WRITER(%ebx)
130 leal MUTEX(%ebx), %ecx
132 call __lll_mutex_lock_wait
135 14: cmpl %gs:TID , %eax
144 leal MUTEX(%ebx), %eax
146 call __lll_mutex_unlock_wake
149 4: subl $1, WRITERS_QUEUED(%ebx)
157 leal MUTEX(%ebx), %eax
159 call __lll_mutex_unlock_wake
166 leal MUTEX(%ebx), %ecx
168 call __lll_mutex_lock_wait
170 .size __pthread_rwlock_wrlock,.-__pthread_rwlock_wrlock
172 .globl pthread_rwlock_wrlock
173 pthread_rwlock_wrlock = __pthread_rwlock_wrlock
175 .globl __pthread_rwlock_wrlock_internal
176 __pthread_rwlock_wrlock_internal = __pthread_rwlock_wrlock