1 /* Copyright (C) 2002-2014 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 <kernel-features.h>
27 .globl __pthread_rwlock_unlock
28 .type __pthread_rwlock_unlock,@function
30 __pthread_rwlock_unlock:
33 cfi_adjust_cfa_offset(4)
35 cfi_adjust_cfa_offset(4)
48 cmpxchgl %edx, MUTEX(%edi)
52 2: cmpl $0, WRITER(%edi)
54 subl $1, NR_READERS(%edi)
57 5: movl $0, WRITER(%edi)
60 leal WRITERS_WAKEUP(%edi), %ebx
61 cmpl $0, WRITERS_QUEUED(%edi)
64 /* If also no readers waiting nothing to do. */
65 cmpl $0, READERS_QUEUED(%edi)
68 movl $0x7fffffff, %edx
69 leal READERS_WAKEUP(%edi), %ebx
81 #ifdef __ASSUME_PRIVATE_FUTEX
82 movzbl PSHARED(%edi), %ecx
83 xorl $FUTEX_PRIVATE_FLAG|FUTEX_WAKE, %ecx
85 movzbl PSHARED(%edi), %ecx
87 xorl %gs:PRIVATE_FUTEX, %ecx
94 cfi_adjust_cfa_offset(-4)
97 cfi_adjust_cfa_offset(-4)
101 cfi_adjust_cfa_offset(8)
103 cfi_offset(%edi, -12)
122 leal MUTEX(%edi), %edx
124 movzbl PSHARED(%edi), %ecx
132 leal MUTEX(%edi), %eax
134 movzbl PSHARED(%edi), %ecx
135 call __lll_unlock_wake
142 leal MUTEX(%edi), %eax
144 movzbl PSHARED(%edi), %ecx
145 call __lll_unlock_wake
148 .size __pthread_rwlock_unlock,.-__pthread_rwlock_unlock
150 strong_alias (__pthread_rwlock_unlock, pthread_rwlock_unlock)
151 hidden_def (__pthread_rwlock_unlock)