text: /* Machine-dependent pthreads configuration and inline functions.
     hppa version.
     Copyright (C) 2000, 2002, 2003 Free Software Foundation, Inc.
     This file is part of the GNU C Library.
     Contributed by Richard Henderson <rth@tamu.edu>.
  
     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.  */
  
  #ifndef _PT_MACHINE_H
  #define _PT_MACHINE_H   1
  
  #include <features.h>
  #include <bits/initspin.h>
  
  #ifndef PT_EI
  # define PT_EI __extern_always_inline
  #endif
  
  /* Get some notion of the current stack.  Need not be exactly the top
     of the stack, just something somewhere in the current frame.  */
  #define CURRENT_STACK_FRAME  stack_pointer
  register char * stack_pointer __asm__ ("%r30");
  
  
  /* The hppa only has one atomic read and modify memory operation,
     load and clear, so hppa spinlocks must use zero to signify that
     someone is holding the lock.  */
  
  #define xstr(s) str(s)
  #define str(s) #s
  /* Spinlock implementation; required.  */
  PT_EI long int
  testandset (int *spinlock)
  {
    int ret;
  
    __asm__ __volatile__(
         "ldcw 0(%2),%0"
         : "=r"(ret), "=m"(*spinlock)
         : "r"(spinlock));
  
    return ret == 0;
  }
  #undef str
  #undef xstr
  
  #endif /* pt-machine.h */
  