about summary refs log tree commit diff
path: root/sysdeps/sh/nptl/pthread_spin_lock.c
blob: e4bf190075b801466f6b14dfcca867808c9c9e8e (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
/* Copyright (C) 2003-2014 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 "pthreadP.h"

int
pthread_spin_lock (lock)
     pthread_spinlock_t *lock;
{
  unsigned int val;

  do
    asm volatile ("tas.b @%1; movt %0"
		  : "=&r" (val)
		  : "r" (lock)
		  : "memory");
  while (val == 0);

  return 0;
}