summaryrefslogtreecommitdiff
path: root/libpthread/nptl/sysdeps/sparc/pthread_spin_trylock.c
blob: c1b7b239761471a6c0ae4b0eee35b3c5a7096e4f (plain)
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
/* Copyright (C) 2003 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Jakub Jelinek <jakub@redhat.com>, 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/>.  */

#include <errno.h>
#include "pthreadP.h"

int
pthread_spin_trylock (pthread_spinlock_t *lock)
{
  int res;
  __asm__ __volatile__ ("ldstub [%1], %0" : "=r" (res) : "r" (lock) : "memory");
  return res == 0 ? 0 : EBUSY;
}