/* Copyright (C) 2003, 2004 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, write to the Free   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA   02111-1307 USA.  */#include "pthreadP.h"intpthread_spin_lock (lock)     pthread_spinlock_t *lock;{  int *p = (int *) lock;  while (__builtin_expect (__sync_val_compare_and_swap (p, 0, 1), 0))    {      /* Spin without using the atomic instruction.  */      do	__asm __volatile ("hint @pause" : : : "memory");      while (*p);    }  return 0;}