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- /* Machine-dependent pthreads configuration and inline functions.
- CRIS version.
- Copyright (C) 2001, 2002, 2003 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. */
- #ifndef _PT_MACHINE_H
- #define _PT_MACHINE_H 1
- #ifndef PT_EI
- # define PT_EI extern inline __attribute__ ((always_inline))
- #endif
- extern long int testandset (int *spinlock);
- extern int __compare_and_swap (long int *p, long int oldval, long int newval);
- PT_EI long int
- testandset (int *spinlock)
- {
- register unsigned long int ret;
- /* Note the use of a dummy output of *spinlock to expose the write. The
- memory barrier is to stop *other* writes being moved past this code. */
- __asm__ __volatile__("clearf\n"
- "0:\n\t"
- "movu.b [%2],%0\n\t"
- "ax\n\t"
- "move.b %3,[%2]\n\t"
- "bwf 0b\n\t"
- "clearf"
- : "=&r" (ret), "=m" (*spinlock)
- : "r" (spinlock), "r" ((int) 1)
- : "memory");
- return ret;
- }
- /* Get some notion of the current stack. Need not be exactly the top
- of the stack, just something somewhere in the current frame.
- I don't trust register variables, so let's do this the safe way. */
- #define CURRENT_STACK_FRAME \
- ({ char *sp; __asm__ ("move.d $sp,%0" : "=rm" (sp)); sp; })
- #endif /* pt-machine.h */
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