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 <kernel-features.h>
28 .globl __pthread_rwlock_unlock
29 .type __pthread_rwlock_unlock,@function
31 __pthread_rwlock_unlock:
34 cfi_adjust_cfa_offset(4)
36 cfi_adjust_cfa_offset(4)
49 cmpxchgl %edx, MUTEX(%edi)
53 2: cmpl $0, WRITER(%edi)
55 subl $1, NR_READERS(%edi)
58 5: movl $0, WRITER(%edi)
61 leal WRITERS_WAKEUP(%edi), %ebx
62 cmpl $0, WRITERS_QUEUED(%edi)
65 /* If also no readers waiting nothing to do. */
66 cmpl $0, READERS_QUEUED(%edi)
69 movl $0x7fffffff, %edx
70 leal READERS_WAKEUP(%edi), %ebx
82 #ifdef __ASSUME_PRIVATE_FUTEX
83 movzbl PSHARED(%edi), %ecx
84 xorl $FUTEX_PRIVATE_FLAG|FUTEX_WAKE, %ecx
86 movzbl PSHARED(%edi), %ecx
88 xorl %gs:PRIVATE_FUTEX, %ecx
95 cfi_adjust_cfa_offset(-4)
98 cfi_adjust_cfa_offset(-4)
102 cfi_adjust_cfa_offset(8)
104 cfi_offset(%edi, -12)
123 leal MUTEX(%edi), %edx
125 movzbl PSHARED(%edi), %ecx
133 leal MUTEX(%edi), %eax
135 movzbl PSHARED(%edi), %ecx
136 call __lll_unlock_wake
143 leal MUTEX(%edi), %eax
145 movzbl PSHARED(%edi), %ecx
146 call __lll_unlock_wake
149 .size __pthread_rwlock_unlock,.-__pthread_rwlock_unlock
151 .globl pthread_rwlock_unlock
152 pthread_rwlock_unlock = __pthread_rwlock_unlock
154 .globl __pthread_rwlock_unlock_internal
155 __pthread_rwlock_unlock_internal = __pthread_rwlock_unlock