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/* Machine-dependent pthreads configuration and inline functions.
SuperH version.
Copyright (C) 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Niibe Yutaka <gniibe@m17n.org>.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library 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_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);
/* Spinlock implementation; required. */
PT_EI long int
testandset (int *spinlock)
{
int ret;
__asm__ __volatile__(
"tas.b @%1\n\t"
"movt %0"
: "=r" (ret)
: "r" (spinlock)
: "memory", "cc");
return (ret == 0);
}
/* 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__ ("r15");
/* Return the thread descriptor for the current thread. */
struct _pthread_descr_struct;
#define THREAD_SELF \
({ struct _pthread_descr_struct *self; \
__asm__("stc gbr,%0" : "=r" (self)); self;})
/* Initialize the thread-unique value. */
#define INIT_THREAD_SELF(descr, nr) \
({ __asm__ __volatile__("ldc %0,gbr" : : "r" (descr));})
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