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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 <shlib-compat.h>
#include <pthread-errnos.h>
#ifndef UP
# define LOCK lock
#else
# define
#endif
#define SYS_gettimeofday __NR_gettimeofday
#define SYS_futex 240
#define FUTEX_WAKE 1
.text
.globl sem_timedwait
.type sem_timedwait,@function
.align 16
sem_timedwait:
movl 4(%esp), %ecx
movl (%ecx), %eax
2: testl %eax, %eax
je,pn 1f
leal -1(%eax), %edx
LOCK
cmpxchgl %edx, (%ecx)
jne,pn 2b
xorl %eax, %eax
ret
/* Check whether the timeout value is valid. */
1: pushl %esi
pushl %edi
pushl %ebx
subl $8, %esp
movl %esp, %esi
movl 28(%esp), %edi
/* Check for invalid nanosecond field. */
cmpl $1000000000, 4(%edi)
movl $EINVAL, %eax
jae 6f
7: xorl %ecx, %ecx
movl %esp, %ebx
movl %ecx, %edx
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
movl $ETIMEDOUT, %eax
js 6f /* Time is already up. */
movl %ecx, (%esp) /* Store relative timeout. */
movl %edx, 4(%esp)
movl 24(%esp), %ebx
xorl %ecx, %ecx
movl $SYS_futex, %eax
xorl %edx, %edx
ENTER_KERNEL
testl %eax, %eax
je,pt 9f
cmpl $-EWOULDBLOCK, %eax
jne 3f
9: movl (%ebx), %eax
8: testl %eax, %eax
je 7b
leal -1(%eax), %ecx
LOCK
cmpxchgl %ecx, (%ebx)
jne,pn 8b
addl $8, %esp
xorl %eax, %eax
popl %ebx
popl %edi
popl %esi
ret
3: negl %eax
6:
#ifdef PIC
call __i686.get_pc_thunk.bx
#else
movl $4f, %ebx
4:
#endif
addl $_GLOBAL_OFFSET_TABLE_, %ebx
#if USE___THREAD
movl %gs:0, %edx
subl errno@gottpoff(%ebx), %edx
movl %eax, (%edx)
#else
movl %eax, %edx
call __errno_location@plt
movl %edx, (%eax)
#endif
addl $8, %esp
orl $-1, %eax
popl %ebx
popl %edi
popl %esi
ret
.size sem_timedwait,.-sem_timedwait
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