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/* Machine-dependent pthreads configuration and inline functions.
hppa version.
Copyright (C) 2000, 2002 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 <bits/initspin.h>
#ifndef PT_EI
# define PT_EI extern inline
#endif
extern long int testandset (int *spinlock);
extern int __compare_and_swap (long int *p, long int oldval, long int newval);
/* 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 */
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