about summary refs log tree commit diff
path: root/sysdeps/alpha/nptl/pthread_spin_lock.S
blob: 6d132777a36c428a309f58795560297601f0272f (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
/* Copyright (C) 2003-2016 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Richard Henderson  <rth@twiddle.net>, 2003.

   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/>.  */


	.text
	.align	4

	.globl	pthread_spin_lock
	.ent	pthread_spin_lock
pthread_spin_lock:
	.frame	$sp, 0, $26, 0
	.prologue 0

0:	ldl_l	$1, 0($16)
	lda	$2, 1
	lda	$0, 0
	bne	$1, 1f

	stl_c	$2, 0($16)
	beq	$2, 1f
	mb
	ret

1:	ldl	$1, 0($16)
	bne	$1, 1b
	unop
	br	0b

	.end	pthread_spin_lock