/* Copyright (C) 2002, 2003, 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>	.text	.globl	__pthread_rwlock_rdlock	.type	__pthread_rwlock_rdlock,@function	.align	16__pthread_rwlock_rdlock:	xorq	%r10, %r10	/* 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(%rdi), %eax	testl	%eax, %eax	jne	14f	cmpl	$0, WRITERS_QUEUED(%rdi)	je	5f	cmpl	$0, FLAGS(%rdi)	je	5f3:	incl	READERS_QUEUED(%rdi)	je	4f	movl	READERS_WAKEUP(%rdi), %edx	LOCK#if MUTEX == 0	decl	(%rdi)#else	decl	MUTEX(%rdi)#endif	jne	10f11:#ifdef __ASSUME_PRIVATE_FUTEX	movl	$FUTEX_PRIVATE_FLAG|FUTEX_WAIT, %esi	xorl	PSHARED(%rdi), %esi#else# if FUTEX_WAIT == 0	movl	PSHARED(%rdi), %esi# else	movl	$FUTEX_WAIT, %esi	orl	PSHARED(%rdi), %esi# endif	xorl	%fs:PRIVATE_FUTEX, %esi#endif	addq	$READERS_WAKEUP, %rdi	movl	$SYS_futex, %eax	syscall	subq	$READERS_WAKEUP, %rdi	/* Reget the lock.  */	movl	$1, %esi	xorl	%eax, %eax	LOCK#if MUTEX == 0	cmpxchgl %esi, (%rdi)#else	cmpxchgl %esi, MUTEX(%rdi)#endif	jnz	12f13:	decl	READERS_QUEUED(%rdi)	jmp	2b5:	xorl	%edx, %edx	incl	NR_READERS(%rdi)	je	8f9:	LOCK#if MUTEX == 0	decl	(%rdi)#else	decl	MUTEX(%rdi)#endif	jne	6f7:	movq	%rdx, %rax	retq1:	movl	PSHARED(%rdi), %esi#if MUTEX != 0	addq	$MUTEX, %rdi#endif	callq	__lll_lock_wait#if MUTEX != 0	subq	$MUTEX, %rdi#endif	jmp	2b14:	cmpl	%fs:TID, %eax	jne	3b	/* Deadlock detected.  */	movl	$EDEADLK, %edx	jmp	9b6:	movl	PSHARED(%rdi), %esi#if MUTEX != 0	addq	$MUTEX, %rdi#endif	callq	__lll_unlock_wake#if MUTEX != 0	subq	$MUTEX, %rdi#endif	jmp	7b	/* Overflow.  */8:	decl	NR_READERS(%rdi)	movl	$EAGAIN, %edx	jmp	9b	/* Overflow.  */4:	decl	READERS_QUEUED(%rdi)	movl	$EAGAIN, %edx	jmp	9b10:	movl	PSHARED(%rdi), %esi#if MUTEX != 0	addq	$MUTEX, %rdi#endif	callq	__lll_unlock_wake#if MUTEX != 0	subq	$MUTEX, %rdi#endif	jmp	11b12:	movl	PSHARED(%rdi), %esi#if MUTEX == 0	addq	$MUTEX, %rdi#endif	callq	__lll_lock_wait#if MUTEX != 0	subq	$MUTEX, %rdi#endif	jmp	13b	.size	__pthread_rwlock_rdlock,.-__pthread_rwlock_rdlock	.globl	pthread_rwlock_rdlockpthread_rwlock_rdlock = __pthread_rwlock_rdlock	.globl	__pthread_rwlock_rdlock_internal__pthread_rwlock_rdlock_internal = __pthread_rwlock_rdlock