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:
46 cmpxchgl %edx, MUTEX(%ebx)
50 2: movl WRITER(%ebx), %eax
53 cmpl $0, NR_READERS(%ebx)
56 3: addl $1, WRITERS_QUEUED(%ebx)
59 movl WRITERS_WAKEUP(%ebx), %edx
70 #ifdef __ASSUME_PRIVATE_FUTEX
71 movzbl PSHARED(%ebx), %ecx
72 xorl $FUTEX_PRIVATE_FLAG|FUTEX_WAIT, %ecx
74 movzbl PSHARED(%ebx), %ecx
78 xorl %gs:PRIVATE_FUTEX, %ecx
80 addl $WRITERS_WAKEUP, %ebx
84 subl $WRITERS_WAKEUP, %ebx
93 cmpxchgl %edx, MUTEX(%ebx)
97 13: subl $1, WRITERS_QUEUED(%ebx)
102 movl %eax, WRITER(%ebx)
121 leal MUTEX(%ebx), %edx
123 movzbl PSHARED(%ebx), %ecx
127 14: cmpl %gs:TID , %eax
136 leal MUTEX(%ebx), %eax
138 movzbl PSHARED(%ebx), %ecx
139 call __lll_unlock_wake
142 4: subl $1, WRITERS_QUEUED(%ebx)
150 leal MUTEX(%ebx), %eax
152 movzbl PSHARED(%ebx), %ecx
153 call __lll_unlock_wake
160 leal MUTEX(%ebx), %edx
162 movzbl PSHARED(%ebx), %ecx
165 .size __pthread_rwlock_wrlock,.-__pthread_rwlock_wrlock
167 .globl pthread_rwlock_wrlock
168 pthread_rwlock_wrlock = __pthread_rwlock_wrlock
170 .globl __pthread_rwlock_wrlock_internal
171 __pthread_rwlock_wrlock_internal = __pthread_rwlock_wrlock