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/* Copyright (C) 2002, 2003, 2004, 2006 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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <sysdep.h>
#include <pthread-errnos.h>
#include <lowlevelrobustlock.h>
.text
#ifndef LOCK
# ifdef UP
# define LOCK
# else
# define LOCK lock
# endif
#endif
#define SYS_gettimeofday __NR_gettimeofday
#define SYS_futex 240
#define FUTEX_WAIT 0
#define FUTEX_WAKE 1
#define FUTEX_WAITERS 0x80000000
#define FUTEX_OWNER_DIED 0x40000000
.globl __lll_robust_mutex_lock_wait
.type __lll_robust_mutex_lock_wait,@function
.hidden __lll_robust_mutex_lock_wait
.align 16
__lll_robust_mutex_lock_wait:
pushl %edx
pushl %ebx
pushl %esi
movl %ecx, %ebx
xorl %esi, %esi /* No timeout. */
xorl %ecx, %ecx /* movl $FUTEX_WAIT, %ecx */
4: movl %eax, %edx
orl $FUTEX_WAITERS, %edx
testl $FUTEX_OWNER_DIED, %eax
jnz 3f
cmpl %edx, %eax /* NB: %edx == 2 */
je 1f
LOCK
cmpxchgl %edx, (%ebx)
jnz 2f
1: movl $SYS_futex, %eax
ENTER_KERNEL
movl (%ebx), %eax
2: test %eax, %eax
jne 4b
movl %gs:TID, %edx
orl $FUTEX_WAITERS, %edx
LOCK
cmpxchgl %edx, (%ebx)
jnz 4b
/* NB: %eax == 0 */
3: popl %esi
popl %ebx
popl %edx
ret
.size __lll_robust_mutex_lock_wait,.-__lll_robust_mutex_lock_wait
.globl __lll_robust_mutex_timedlock_wait
.type __lll_robust_mutex_timedlock_wait,@function
.hidden __lll_robust_mutex_timedlock_wait
.align 16
__lll_robust_mutex_timedlock_wait:
/* Check for a valid timeout value. */
cmpl $1000000000, 4(%edx)
jae 3f
pushl %edi
pushl %esi
pushl %ebx
pushl %ebp
/* Stack frame for the timespec and timeval structs. */
subl $12, %esp
movl %ecx, %ebp
movl %edx, %edi
1: movl %eax, 8(%esp)
/* Get current time. */
movl %esp, %ebx
xorl %ecx, %ecx
movl $SYS_gettimeofday, %eax
ENTER_KERNEL
/* Compute relative timeout. */
movl 4(%esp), %eax
movl $1000, %edx
mul %edx /* Milli seconds to nano seconds. */
movl (%edi), %ecx
movl 4(%edi), %edx
subl (%esp), %ecx
subl %eax, %edx
jns 4f
addl $1000000000, %edx
subl $1, %ecx
4: testl %ecx, %ecx
js 8f /* Time is already up. */
/* Store relative timeout. */
movl %ecx, (%esp)
movl %edx, 4(%esp)
movl %ebp, %ebx
movl 8(%esp), %edx
movl %edx, %eax
orl $FUTEX_WAITERS, %edx
testl $FUTEX_OWNER_DIED, %eax
jnz 6f
cmpl %eax, %edx
je 2f
LOCK
cmpxchgl %edx, (%ebx)
movl $0, %ecx /* Must use mov to avoid changing cc. */
jnz 5f
2:
/* Futex call. */
movl %esp, %esi
xorl %ecx, %ecx /* movl $FUTEX_WAIT, %ecx */
movl $SYS_futex, %eax
ENTER_KERNEL
movl %eax, %ecx
movl (%ebx), %eax
5: testl %eax, %eax
jne 7f
movl %gs:TID, %edx
orl $FUTEX_WAITERS, %edx
LOCK
cmpxchgl %edx, (%ebx)
jnz 7f
6: addl $12, %esp
popl %ebp
popl %ebx
popl %esi
popl %edi
ret
/* Check whether the time expired. */
7: cmpl $-ETIMEDOUT, %ecx
jne 1b
8: movl $ETIMEDOUT, %eax
jmp 6b
3: movl $EINVAL, %eax
ret
.size __lll_robust_mutex_timedlock_wait,.-__lll_robust_mutex_timedlock_wait
|
