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/* Copyright (C) 2002, 2003 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>
.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
.globl __lll_lock_wait
.type __lll_lock_wait,@function
.hidden __lll_lock_wait
.align 16
__lll_lock_wait:
pushl %esi
pushl %ebx
pushl %edx
movl %ecx, %ebx
xorl %esi, %esi /* No timeout. */
xorl %ecx, %ecx /* movl $FUTEX_WAIT, %ecx */
1:
leal -1(%eax), %edx /* account for the preceeded xadd. */
movl $SYS_futex, %eax
ENTER_KERNEL
orl $-1, %eax /* Load -1. */
LOCK
xaddl %eax, (%ebx)
jne,pn 1b
movl $-1, (%ebx)
popl %edx
popl %ebx
popl %esi
ret
.size __lll_lock_wait,.-__lll_lock_wait
#ifdef NOT_IN_libc
.globl lll_unlock_wake_cb
.type lll_unlock_wake_cb,@function
.hidden lll_unlock_wake_cb
.align 16
lll_unlock_wake_cb:
pushl %ebx
pushl %ecx
pushl %edx
movl 20(%esp), %ebx
LOCK
addl $1, (%ebx)
jng 1f
popl %edx
popl %ecx
popl %ebx
ret
.size lll_unlock_wake_cb,.-lll_unlock_wake_cb
#endif
.globl __lll_unlock_wake
.type __lll_unlock_wake,@function
.hidden __lll_unlock_wake
.align 16
__lll_unlock_wake:
pushl %ebx
pushl %ecx
pushl %edx
movl %eax, %ebx
1: movl $FUTEX_WAKE, %ecx
movl $1, %edx /* Wake one thread. */
movl $SYS_futex, %eax
movl %edx, (%ebx) /* Stores '$1'. */
ENTER_KERNEL
popl %edx
popl %ecx
popl %ebx
ret
.size __lll_unlock_wake,.-__lll_unlock_wake
#ifdef NOT_IN_libc
.globl __lll_timedwait_tid
.type __lll_timedwait_tid,@function
.hidden __lll_timedwait_tid
.align 16
__lll_timedwait_tid:
pushl %edi
pushl %esi
pushl %ebx
pushl %ebp
movl %eax, %ebp
movl %edx, %edi
subl $8, %esp
/* Get current time. */
2: 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 5f
addl $1000000000, %edx
subl $1, %ecx
5: testl %ecx, %ecx
js 6f /* Time is already up. */
movl %ecx, (%esp) /* Store relative timeout. */
movl %edx, 4(%esp)
movl (%ebp), %edx
testl %edx, %edx
jz 4f
movl %esp, %esi
xorl %ecx, %ecx /* movl $FUTEX_WAIT, %ecx */
movl %ebp, %ebx
movl $SYS_futex, %eax
ENTER_KERNEL
cmpl $0, (%ebx)
jne 1f
4: xorl %eax, %eax
3: addl $8, %esp
popl %ebp
popl %ebx
popl %esi
popl %edi
ret
1: cmpl $-ETIMEDOUT, %eax
jne 2b
6: movl $ETIMEDOUT, %eax
jmp 3b
.size __lll_timedwait_tid,.-__lll_timedwait_tid
#endif
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