127 lines
2.5 KiB
ArmAsm
127 lines
2.5 KiB
ArmAsm
/* Copyright (C) 2002-2014 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <sysdep.h>
|
|
#include <lowlevellock.h>
|
|
#include <lowlevelrwlock.h>
|
|
#include <kernel-features.h>
|
|
|
|
|
|
.text
|
|
|
|
.globl __pthread_rwlock_unlock
|
|
.type __pthread_rwlock_unlock,@function
|
|
.align 16
|
|
__pthread_rwlock_unlock:
|
|
cfi_startproc
|
|
/* Get the lock. */
|
|
movl $1, %esi
|
|
xorl %eax, %eax
|
|
LOCK
|
|
#if MUTEX == 0
|
|
cmpxchgl %esi, (%rdi)
|
|
#else
|
|
cmpxchgl %esi, MUTEX(%rdi)
|
|
#endif
|
|
jnz 1f
|
|
|
|
2: cmpl $0, WRITER(%rdi)
|
|
jne 5f
|
|
decl NR_READERS(%rdi)
|
|
jnz 6f
|
|
|
|
5: movl $0, WRITER(%rdi)
|
|
|
|
movl $1, %edx
|
|
leaq WRITERS_WAKEUP(%rdi), %r10
|
|
cmpl $0, WRITERS_QUEUED(%rdi)
|
|
jne 0f
|
|
|
|
/* If also no readers waiting nothing to do. */
|
|
cmpl $0, READERS_QUEUED(%rdi)
|
|
je 6f
|
|
|
|
movl $0x7fffffff, %edx
|
|
leaq READERS_WAKEUP(%rdi), %r10
|
|
|
|
0: incl (%r10)
|
|
LOCK
|
|
#if MUTEX == 0
|
|
decl (%rdi)
|
|
#else
|
|
decl MUTEX(%rdi)
|
|
#endif
|
|
jne 7f
|
|
|
|
8:
|
|
#ifdef __ASSUME_PRIVATE_FUTEX
|
|
movl $FUTEX_PRIVATE_FLAG|FUTEX_WAKE, %esi
|
|
xorl PSHARED(%rdi), %esi
|
|
#else
|
|
movl $FUTEX_WAKE, %esi
|
|
orl PSHARED(%rdi), %esi
|
|
xorl %fs:PRIVATE_FUTEX, %esi
|
|
#endif
|
|
movl $SYS_futex, %eax
|
|
movq %r10, %rdi
|
|
syscall
|
|
|
|
xorl %eax, %eax
|
|
retq
|
|
|
|
.align 16
|
|
6: LOCK
|
|
#if MUTEX == 0
|
|
decl (%rdi)
|
|
#else
|
|
decl MUTEX(%rdi)
|
|
#endif
|
|
jne 3f
|
|
|
|
4: xorl %eax, %eax
|
|
retq
|
|
|
|
1: movl PSHARED(%rdi), %esi
|
|
#if MUTEX != 0
|
|
addq $MUTEX, %rdi
|
|
#endif
|
|
callq __lll_lock_wait
|
|
#if MUTEX != 0
|
|
subq $MUTEX, %rdi
|
|
#endif
|
|
jmp 2b
|
|
|
|
3: movl PSHARED(%rdi), %esi
|
|
#if MUTEX != 0
|
|
addq $MUTEX, %rdi
|
|
#endif
|
|
callq __lll_unlock_wake
|
|
jmp 4b
|
|
|
|
7: movl PSHARED(%rdi), %esi
|
|
#if MUTEX != 0
|
|
addq $MUTEX, %rdi
|
|
#endif
|
|
callq __lll_unlock_wake
|
|
jmp 8b
|
|
cfi_endproc
|
|
.size __pthread_rwlock_unlock,.-__pthread_rwlock_unlock
|
|
|
|
strong_alias (__pthread_rwlock_unlock, pthread_rwlock_unlock)
|
|
hidden_def (__pthread_rwlock_unlock)
|