2002-12-18 10:56:40 +00:00
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/* Copyright (C) 2002 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <sysdep.h>
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.text
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#define SYS_gettimeofday __NR_gettimeofday
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#define SYS_futex 240
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#define FUTEX_WAIT 0
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#define FUTEX_WAKE 1
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#define EWOULDBLOCK 11
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#define EINVAL 22
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#define ETIMEDOUT 110
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.globl __lll_mutex_lock_wait
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.type __lll_mutex_lock_wait,@function
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.hidden __lll_mutex_lock_wait
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.align 16
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__lll_mutex_lock_wait:
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pushl %esi
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pushl %ebx
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pushl %edx
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movl %ecx, %ebx
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xorl %esi, %esi /* No timeout. */
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xorl %ecx, %ecx /* movl $FUTEX_WAIT, %ecx */
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1:
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leal 1(%eax), %edx /* account for the preceeded xadd. */
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movl $SYS_futex, %eax
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2002-12-20 07:12:24 +00:00
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ENTER_KERNEL
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2002-12-18 10:56:40 +00:00
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movl $1, %eax
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#ifndef UP
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cmpl $0, %gs:MULTIPLE_THREADS_OFFSET
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je,pt 0f
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lock
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0:
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#endif
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xaddl %eax, (%ebx)
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testl %eax, %eax
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jne 1b
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movl $2, (%ebx)
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popl %edx
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popl %ebx
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popl %esi
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ret
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.size __lll_mutex_lock_wait,.-__lll_mutex_lock_wait
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.globl __lll_mutex_timedlock_wait
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.type __lll_mutex_timedlock_wait,@function
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.hidden __lll_mutex_timedlock_wait
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.align 16
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__lll_mutex_timedlock_wait:
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/* Check for a valid timeout value. */
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cmpl $1000000000, 4(%edx)
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jae 3f
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pushl %edi
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pushl %esi
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pushl %ebx
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pushl %ebp
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/* Stack frame for the timespec and timeval structs. */
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subl $8, %esp
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movl %ecx, %ebp
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movl %edx, %edi
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leal 1(%eax), %esi
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/* Get current time. */
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1:
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movl %esp, %ebx
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xorl %ecx, %ecx
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movl $SYS_gettimeofday, %eax
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2002-12-20 07:12:24 +00:00
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ENTER_KERNEL
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2002-12-18 10:56:40 +00:00
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/* Compute relative timeout. */
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movl 4(%esp), %eax
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movl $1000, %edx
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mul %edx /* Milli seconds to nano seconds. */
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movl (%edi), %ecx
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movl 4(%edi), %edx
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subl (%esp), %ecx
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subl %eax, %edx
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jns 4f
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addl $1000000000, %edx
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decl %ecx
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4: testl %ecx, %ecx
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js 5f /* Time is already up. */
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/* Futex call. */
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movl %ecx, (%esp) /* Store relative timeout. */
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movl %edx, 4(%esp)
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movl %esi, %edx
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movl %esp, %esi
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xorl %ecx, %ecx /* movl $FUTEX_WAIT, %ecx */
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movl %ebp, %ebx
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movl $SYS_futex, %eax
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2002-12-20 07:12:24 +00:00
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ENTER_KERNEL
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2002-12-18 10:56:40 +00:00
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movl $1, %esi
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#ifndef UP
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cmpl $0, %gs:MULTIPLE_THREADS_OFFSET
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je,pt 0f
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lock
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0:
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#endif
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xaddl %esi, (%ebx)
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testl %esi, %esi
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jne 7f
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movl $2, (%ebx)
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xorl %eax, %eax
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6: addl $8, %esp
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popl %ebp
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popl %ebx
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popl %esi
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popl %edi
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ret
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/* Check whether the time expired. */
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7: cmpl $-ETIMEDOUT, %eax
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je 5f
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jmp 1b
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3: movl $EINVAL, %eax
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ret
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5: movl $ETIMEDOUT, %eax
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jmp 6b
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.size __lll_mutex_timedlock_wait,.-__lll_mutex_timedlock_wait
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.globl __lll_mutex_unlock_wake
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.type __lll_mutex_unlock_wake,@function
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.hidden __lll_mutex_unlock_wake
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.align 16
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__lll_mutex_unlock_wake:
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pushl %esi
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pushl %ebx
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pushl %ecx
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pushl %edx
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movl $FUTEX_WAKE, %ecx
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movl %eax, %ebx
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xorl %esi, %esi
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movl $0, (%ebx)
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movl $1, %edx /* Wake one thread. */
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movl $SYS_futex, %eax
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2002-12-20 07:12:24 +00:00
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ENTER_KERNEL
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2002-12-18 10:56:40 +00:00
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popl %edx
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popl %ecx
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popl %ebx
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popl %esi
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ret
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.size __lll_mutex_unlock_wake,.-__lll_mutex_unlock_wake
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