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 <lowlevelrwlock.h>
37 .globl __pthread_rwlock_unlock
38 .type __pthread_rwlock_unlock,@function
40 __pthread_rwlock_unlock:
53 cmpxchgl %edx, MUTEX(%edi)
57 2: cmpl $0, WRITER(%edi)
59 subl $1, NR_READERS(%edi)
62 5: movl $0, WRITER(%edi)
65 leal WRITERS_WAKEUP(%edi), %ebx
66 cmpl $0, WRITERS_QUEUED(%edi)
69 /* If also no readers waiting nothing to do. */
70 cmpl $0, READERS_QUEUED(%edi)
73 movl $0x7fffffff, %edx
74 leal READERS_WAKEUP(%edi), %ebx
86 #if __ASSUME_PRIVATE_FUTEX
87 movzbl PSHARED(%edi), %ecx
88 xorl $FUTEX_PRIVATE_FLAG|FUTEX_WAKE, %ecx
90 movzbl PSHARED(%edi), %ecx
92 xorl %gs:PRIVATE_FUTEX, %ecx
120 leal MUTEX(%edi), %ecx
122 call __lll_mutex_lock_wait
129 leal MUTEX(%edi), %eax
131 call __lll_mutex_unlock_wake
138 leal MUTEX(%edi), %eax
140 call __lll_mutex_unlock_wake
143 .size __pthread_rwlock_unlock,.-__pthread_rwlock_unlock
145 .globl pthread_rwlock_unlock
146 pthread_rwlock_unlock = __pthread_rwlock_unlock
148 .globl __pthread_rwlock_unlock_internal
149 __pthread_rwlock_unlock_internal = __pthread_rwlock_unlock