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 <bits/kernel-features.h>
28 .globl __pthread_rwlock_unlock
29 .type __pthread_rwlock_unlock,@function
30 .protected __pthread_rwlock_unlock
32 __pthread_rwlock_unlock:
35 cfi_adjust_cfa_offset(4)
37 cfi_adjust_cfa_offset(4)
50 cmpxchgl %edx, MUTEX(%edi)
54 2: cmpl $0, WRITER(%edi)
56 subl $1, NR_READERS(%edi)
59 5: movl $0, WRITER(%edi)
62 leal WRITERS_WAKEUP(%edi), %ebx
63 cmpl $0, WRITERS_QUEUED(%edi)
66 /* If also no readers waiting nothing to do. */
67 cmpl $0, READERS_QUEUED(%edi)
70 movl $0x7fffffff, %edx
71 leal READERS_WAKEUP(%edi), %ebx
83 #ifdef __ASSUME_PRIVATE_FUTEX
84 movzbl PSHARED(%edi), %ecx
85 xorl $FUTEX_PRIVATE_FLAG|FUTEX_WAKE, %ecx
87 movzbl PSHARED(%edi), %ecx
89 xorl %gs:PRIVATE_FUTEX, %ecx
96 cfi_adjust_cfa_offset(-4)
99 cfi_adjust_cfa_offset(-4)
103 cfi_adjust_cfa_offset(8)
105 cfi_offset(%edi, -12)
124 leal MUTEX(%edi), %edx
126 movzbl PSHARED(%edi), %ecx
134 leal MUTEX(%edi), %eax
136 movzbl PSHARED(%edi), %ecx
137 call __lll_unlock_wake
144 leal MUTEX(%edi), %eax
146 movzbl PSHARED(%edi), %ecx
147 call __lll_unlock_wake
150 .size __pthread_rwlock_unlock,.-__pthread_rwlock_unlock
152 .globl pthread_rwlock_unlock
153 pthread_rwlock_unlock = __pthread_rwlock_unlock
155 .globl __pthread_rwlock_unlock_internal
156 __pthread_rwlock_unlock_internal = __pthread_rwlock_unlock