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/* Copyright (C) 2002 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>
.text
#ifdef UP
# define LOCK
#else
# define LOCK lock
#endif
#define SYS_gettimeofday __NR_gettimeofday
#define SYS_futex 240
#define FUTEX_WAIT 0
#define FUTEX_WAKE 1
#define EWOULDBLOCK 11
#define EINVAL 22
#define ETIMEDOUT 110
.globl __lll_mutex_lock_wait
.type __lll_mutex_lock_wait,@function
.hidden __lll_mutex_lock_wait
.align 16
__lll_mutex_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
int $0x80
movl $1, %eax
LOCK
xaddl %eax, (%ebx)
testl %eax, %eax
jne 1b
movl $2, (%ebx)
popl %edx
popl %ebx
popl %esi
ret
.size __lll_mutex_lock_wait,.-__lll_mutex_lock_wait
.globl __lll_mutex_timedlock_wait
.type __lll_mutex_timedlock_wait,@function
.hidden __lll_mutex_timedlock_wait
.align 16
__lll_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 $8, %esp
movl %ecx, %ebp
movl %edx, %edi
leal 1(%eax), %esi
/* Get current time. */
1:
movl %esp, %ebx
xorl %ecx, %ecx
movl $SYS_gettimeofday, %eax
int $0x80
/* 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
decl %ecx
4: testl %ecx, %ecx
js 5f /* Time is already up. */
/* Futex call. */
movl %ecx, (%esp) /* Store relative timeout. */
movl %edx, 4(%esp)
movl %esi, %edx
movl %esp, %esi
xorl %ecx, %ecx /* movl $FUTEX_WAIT, %ecx */
movl %ebp, %ebx
movl $SYS_futex, %eax
int $0x80
movl $1, %esi
LOCK
xaddl %esi, (%ebx)
testl %esi, %esi
jne 7f
movl $2, (%ebx)
xorl %eax, %eax
6: addl $8, %esp
popl %ebp
popl %ebx
popl %esi
popl %edi
ret
/* Check whether the time expired. */
7: cmpl $-ETIMEDOUT, %eax
je 5f
jmp 1b
3: movl $EINVAL, %eax
ret
5: movl $ETIMEDOUT, %eax
jmp 6b
.size __lll_mutex_timedlock_wait,.-__lll_mutex_timedlock_wait
.globl __lll_mutex_unlock_wake
.type __lll_mutex_unlock_wake,@function
.hidden __lll_mutex_unlock_wake
.align 16
__lll_mutex_unlock_wake:
pushl %esi
pushl %ebx
pushl %ecx
pushl %edx
movl $FUTEX_WAKE, %ecx
movl %eax, %ebx
xorl %esi, %esi
movl $0, (%ebx)
movl $1, %edx /* Wake one thread. */
movl $SYS_futex, %eax
int $0x80
popl %edx
popl %ecx
popl %ebx
popl %esi
ret
.size __lll_mutex_unlock_wake,.-__lll_mutex_unlock_wake
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