/* Copyright (C) 2012-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   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, see

   <http://www.gnu.org/licenses/>.  */

#include <lowlevellock.h>

#include <sysdep.h>

ENTRY(pthread_spin_lock)

1:	LOCK

	decl	0(%rdi)

	jne	2f

	xor	%eax, %eax

	ret

	.align	16

2:	rep

	nop

	cmpl	$0, 0(%rdi)

	jg	1b

	jmp	2b

END(pthread_spin_lock)