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 <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:
35 cfi_adjust_cfa_offset(4)
37 cfi_adjust_cfa_offset(4)
51 cmpxchgl %edx, MUTEX(%ebx)
55 2: movl WRITER(%ebx), %eax
58 cmpl $0, NR_READERS(%ebx)
61 3: addl $1, WRITERS_QUEUED(%ebx)
64 movl WRITERS_WAKEUP(%ebx), %edx
75 #ifdef __ASSUME_PRIVATE_FUTEX
76 movzbl PSHARED(%ebx), %ecx
77 xorl $FUTEX_PRIVATE_FLAG|FUTEX_WAIT, %ecx
79 movzbl PSHARED(%ebx), %ecx
83 xorl %gs:PRIVATE_FUTEX, %ecx
85 addl $WRITERS_WAKEUP, %ebx
89 subl $WRITERS_WAKEUP, %ebx
98 cmpxchgl %edx, MUTEX(%ebx)
102 13: subl $1, WRITERS_QUEUED(%ebx)
107 movl %eax, WRITER(%ebx)
119 cfi_adjust_cfa_offset(-4)
122 cfi_adjust_cfa_offset(-4)
126 cfi_adjust_cfa_offset(8)
128 cfi_offset(%ebx, -12)
133 leal MUTEX(%ebx), %edx
135 movzbl PSHARED(%ebx), %ecx
139 14: cmpl %gs:TID , %eax
148 leal MUTEX(%ebx), %eax
150 movzbl PSHARED(%ebx), %ecx
151 call __lll_unlock_wake
154 4: subl $1, WRITERS_QUEUED(%ebx)
162 leal MUTEX(%ebx), %eax
164 movzbl PSHARED(%ebx), %ecx
165 call __lll_unlock_wake
172 leal MUTEX(%ebx), %edx
174 movzbl PSHARED(%ebx), %ecx
178 .size __pthread_rwlock_wrlock,.-__pthread_rwlock_wrlock
180 .globl pthread_rwlock_wrlock
181 pthread_rwlock_wrlock = __pthread_rwlock_wrlock
183 .globl __pthread_rwlock_wrlock_internal
184 __pthread_rwlock_wrlock_internal = __pthread_rwlock_wrlock