glibc/ports/sysdeps/hppa/nptl/pthread_spin_init.c

/* Copyright (C) 2006-2013 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_init (pthread_spinlock_t *lock, int pshared)
{
  int tmp = 0;
  /* This should be a memory barrier to newer compilers */
  __asm__ __volatile__ ("stw,ma %1,0(%0)"
                        : : "r" (lock), "r" (tmp) : "memory");           
  return 0;
}