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, see
17 <http://www.gnu.org/licenses/>. */
20 #include <lowlevellock.h>
21 #include <lowlevelrwlock.h>
22 #include <pthread-errnos.h>
23 #include <kernel-features.h>
28 .globl __pthread_rwlock_wrlock
29 .type __pthread_rwlock_wrlock,@function
31 __pthread_rwlock_wrlock:
34 cfi_adjust_cfa_offset(4)
36 cfi_adjust_cfa_offset(4)
50 cmpxchgl %edx, MUTEX(%ebx)
54 2: movl WRITER(%ebx), %eax
57 cmpl $0, NR_READERS(%ebx)
60 3: addl $1, WRITERS_QUEUED(%ebx)
63 movl WRITERS_WAKEUP(%ebx), %edx
74 #ifdef __ASSUME_PRIVATE_FUTEX
75 movzbl PSHARED(%ebx), %ecx
76 xorl $FUTEX_PRIVATE_FLAG|FUTEX_WAIT, %ecx
78 movzbl PSHARED(%ebx), %ecx
82 xorl %gs:PRIVATE_FUTEX, %ecx
84 addl $WRITERS_WAKEUP, %ebx
88 subl $WRITERS_WAKEUP, %ebx
97 cmpxchgl %edx, MUTEX(%ebx)
101 13: subl $1, WRITERS_QUEUED(%ebx)
106 movl %eax, WRITER(%ebx)
118 cfi_adjust_cfa_offset(-4)
121 cfi_adjust_cfa_offset(-4)
125 cfi_adjust_cfa_offset(8)
127 cfi_offset(%ebx, -12)
132 leal MUTEX(%ebx), %edx
134 movzbl PSHARED(%ebx), %ecx
138 14: cmpl %gs:TID , %eax
147 leal MUTEX(%ebx), %eax
149 movzbl PSHARED(%ebx), %ecx
150 call __lll_unlock_wake
153 4: subl $1, WRITERS_QUEUED(%ebx)
161 leal MUTEX(%ebx), %eax
163 movzbl PSHARED(%ebx), %ecx
164 call __lll_unlock_wake
171 leal MUTEX(%ebx), %edx
173 movzbl PSHARED(%ebx), %ecx
177 .size __pthread_rwlock_wrlock,.-__pthread_rwlock_wrlock
179 .globl pthread_rwlock_wrlock
180 pthread_rwlock_wrlock = __pthread_rwlock_wrlock
182 .globl __pthread_rwlock_wrlock_internal
183 __pthread_rwlock_wrlock_internal = __pthread_rwlock_wrlock