pthread_spin_lock.s

来自「glibc 库, 不仅可以学习使用库函数,还可以学习函数的具体实现,是提高功力的」· S 代码 · 共 46 行

/* Copyright (C) 2003 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Richard Henderson  <[e-mail]>, 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, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */


	.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