/* Copyright (C) 2002, 2003, 2004, 2005, 2007 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 <lowlevellock.h>#include <lowlevelrwlock.h>#include <pthread-errnos.h>#include <kernel-features.h>/* For the calculation see asm/vsyscall.h.  */#define VSYSCALL_ADDR_vgettimeofday	0xffffffffff600000	.text	.globl	pthread_rwlock_timedrdlock	.type	pthread_rwlock_timedrdlock,@function	.align	16pthread_rwlock_timedrdlock:	pushq	%r12	pushq	%r13	pushq	%r14	subq	$16, %rsp	movq	%rdi, %r12	movq	%rsi, %r13	/* Get the lock.  */	movl	$1, %esi	xorl	%eax, %eax	LOCK#if MUTEX == 0	cmpxchgl %esi, (%rdi)#else	cmpxchgl %esi, MUTEX(%rdi)#endif	jnz	1f2:	movl	WRITER(%r12), %eax	testl	%eax, %eax	jne	14f	cmpl	$0, WRITERS_QUEUED(%r12)	je	5f	cmpl	$0, FLAGS(%r12)	je	5f	/* Check the value of the timeout parameter.  */3:	cmpq	$1000000000, 8(%r13)	jae	19f	incl	READERS_QUEUED(%r12)	je	4f	movl	READERS_WAKEUP(%r12), %r14d	/* Unlock.  */	LOCK#if MUTEX == 0	decl	(%r12)#else	decl	MUTEX(%r12)#endif	jne	10f	/* Get current time.  */11:	movq	%rsp, %rdi	xorl	%esi, %esi	movq	$VSYSCALL_ADDR_vgettimeofday, %rax	callq	*%rax	/* Compute relative timeout.  */	movq	8(%rsp), %rax	movl	$1000, %edi	mul	%rdi		/* Milli seconds to nano seconds.  */	movq	(%r13), %rcx	movq	8(%r13), %rdi	subq	(%rsp), %rcx	subq	%rax, %rdi	jns	15f	addq	$1000000000, %rdi	decq	%rcx15:	testq	%rcx, %rcx	js	16f		/* Time is already up.  */	/* Futex call.  */	movq	%rcx, (%rsp)	/* Store relative timeout.  */	movq	%rdi, 8(%rsp)#ifdef __ASSUME_PRIVATE_FUTEX	movl	$FUTEX_PRIVATE_FLAG|FUTEX_WAIT, %esi	xorl	PSHARED(%r12), %esi#else# if FUTEX_WAIT == 0	movl	PSHARED(%r12), %esi# else	movl	$FUTEX_WAIT, %esi	orl	PSHARED(%r12), %esi# endif	xorl	%fs:PRIVATE_FUTEX, %esi#endif	movq	%rsp, %r10	movl	%r14d, %edx	leaq	READERS_WAKEUP(%r12), %rdi	movl	$SYS_futex, %eax	syscall	movq	%rax, %rdx17:	/* Reget the lock.  */	movl	$1, %esi	xorl	%eax, %eax	LOCK#if MUTEX == 0	cmpxchgl %esi, (%r12)#else	cmpxchgl %esi, MUTEX(%r12)#endif	jnz	12f13:	decl	READERS_QUEUED(%r12)	cmpq	$-ETIMEDOUT, %rdx	jne	2b18:	movl	$ETIMEDOUT, %edx	jmp	9f5:	xorl	%edx, %edx	incl	NR_READERS(%r12)	je	8f9:	LOCK#if MUTEX == 0	decl	(%r12)#else	decl	MUTEX(%r12)#endif	jne	6f7:	movq	%rdx, %rax	addq	$16, %rsp	popq	%r14	popq	%r13	popq	%r12	retq1:	movl	PSHARED(%rdi), %esi#if MUTEX != 0	addq	$MUTEX, %rdi#endif	callq	__lll_lock_wait	jmp	2b14:	cmpl	%fs:TID, %eax	jne	3b	movl	$EDEADLK, %edx	jmp	9b6:	movl	PSHARED(%r12), %esi#if MUTEX == 0	movq	%r12, %rdi#else	leal	MUTEX(%r12), %rdi#endif	callq	__lll_unlock_wake	jmp	7b	/* Overflow.  */8:	decl	NR_READERS(%r12)	movl	$EAGAIN, %edx	jmp	9b	/* Overflow.  */4:	decl	READERS_QUEUED(%r12)	movl	$EAGAIN, %edx	jmp	9b10:	movl	PSHARED(%r12), %esi#if MUTEX == 0	movq	%r12, %rdi#else	leaq	MUTEX(%r12), %rdi#endif	callq	__lll_unlock_wake	jmp	11b12:	movl	PSHARED(%r12), %esi#if MUTEX == 0	movq	%r12, %rdi#else	leaq	MUTEX(%r12), %rdi#endif	callq	__lll_lock_wait	jmp	13b16:	movq	$-ETIMEDOUT, %rdx	jmp	17b19:	movl	$EINVAL, %edx	jmp	9b	.size	pthread_rwlock_timedrdlock,.-pthread_rwlock_timedrdlock