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/* Copyright (C) 2000 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Maciej W. Rozycki <macro@ds2.pg.gda.pl>, 2000.
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; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#ifndef _SYS_TAS_H
#define _SYS_TAS_H 1
#include <features.h>
#include <sgidefs.h>
#include <sys/sysmips.h>
__BEGIN_DECLS
extern int _test_and_set (int *p, int v) __THROW;
#ifdef __USE_EXTERN_INLINES
# ifndef _EXTERN_INLINE
# define _EXTERN_INLINE extern __inline
# endif
# if (_MIPS_ISA >= _MIPS_ISA_MIPS2)
_EXTERN_INLINE int
_test_and_set (int *p, int v) __THROW
{
int r, t;
__asm__ __volatile__
("1:\n\t"
"ll %0,%3\n\t"
".set push\n\t"
".set noreorder\n\t"
"beq %0,%4,2f\n\t"
" move %1,%4\n\t"
".set pop\n\t"
"sc %1,%2\n\t"
"beqz %1,1b\n"
"2:\n"
: "=&r" (r), "=&r" (t), "=m" (*p)
: "m" (*p), "r" (v)
: "memory");
return r;
}
# else /* !(_MIPS_ISA >= _MIPS_ISA_MIPS2) */
_EXTERN_INLINE int
_test_and_set (int *p, int v) __THROW
{
return sysmips (MIPS_ATOMIC_SET, (int) p, v, 0);
}
# endif /* !(_MIPS_ISA >= _MIPS_ISA_MIPS2) */
#endif /* __USE_EXTERN_INLINES */
__END_DECLS
#endif /* sys/tas.h */
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