text: /* POSIX spinlock implementation.  M68k version.
     Copyright (C) 2000 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; see the file COPYING.LIB.  If not,
     write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
     Boston, MA 02111-1307, USA.  */
  
  #include <errno.h>
  #include <pthread.h>
  #include "internals.h"
  
  
  int
  __pthread_spin_lock (pthread_spinlock_t *lock)
  {
    unsigned int val;
  
    do
      __asm__ __volatile__ ("tas %1; sne %0"
  		  : "=dm" (val), "=m" (*lock)
  		  : "m" (*lock)
  		  : "cc");
    while (val);
  
    return 0;
  }
  weak_alias (__pthread_spin_lock, pthread_spin_lock)
  
  
  int
  __pthread_spin_trylock (pthread_spinlock_t *lock)
  {
    unsigned int val;
  
    __asm__ __volatile__ ("tas %1; sne %0"
  		: "=dm" (val), "=m" (*lock)
  		: "m" (*lock)
  		: "cc");
  
    return val ? EBUSY : 0;
  }
  weak_alias (__pthread_spin_trylock, pthread_spin_trylock)
  
  
  int
  __pthread_spin_unlock (pthread_spinlock_t *lock)
  {
    return *lock = 0;
  }
  weak_alias (__pthread_spin_unlock, pthread_spin_unlock)
  
  
  int
  __pthread_spin_init (pthread_spinlock_t *lock, int pshared)
  {
    /* We can ignore the `pshared' parameter.  Since we are busy-waiting
       all processes which can access the memory location `lock' points
       to can use the spinlock.  */
    return *lock = 0;
  }
  weak_alias (__pthread_spin_init, pthread_spin_init)
  
  
  int
  __pthread_spin_destroy (pthread_spinlock_t *lock)
  {
    /* Nothing to do.  */
    return 0;
  }
  weak_alias (__pthread_spin_destroy, pthread_spin_destroy)
  