/* Copyright (C) 2002-2018 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, see

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

#include <pthread-errnos.h>

#include <sysdep.h>

#ifdef UP

# define LOCK

#else

# define LOCK lock

#endif

ENTRY(pthread_spin_trylock)

	movl	$1, %eax

	xorl	%ecx, %ecx

	LOCK

	cmpxchgl %ecx, (%rdi)

	movl	$EBUSY, %eax

	cmovel	%ecx, %eax

	retq

END(pthread_spin_trylock)