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77 lines
1.9 KiB
C
77 lines
1.9 KiB
C
/* Copyright (C) 2000 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Maciej W. Rozycki <macro@ds2.pg.gda.pl>, 2000.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#ifndef _SYS_TAS_H
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#define _SYS_TAS_H 1
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#include <features.h>
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#include <sgidefs.h>
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#include <sys/sysmips.h>
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__BEGIN_DECLS
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extern int _test_and_set (int *p, int v) __THROW;
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#ifdef __USE_EXTERN_INLINES
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# ifndef _EXTERN_INLINE
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# define _EXTERN_INLINE extern __inline
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# endif
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# if (_MIPS_ISA >= _MIPS_ISA_MIPS2)
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_EXTERN_INLINE int
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_test_and_set (int *p, int v) __THROW
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{
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int r, t;
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__asm__ __volatile__
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("1:\n\t"
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"ll %0,%3\n\t"
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".set push\n\t"
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".set noreorder\n\t"
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"beq %0,%4,2f\n\t"
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" move %1,%4\n\t"
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".set pop\n\t"
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"sc %1,%2\n\t"
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"beqz %1,1b\n"
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"2:\n"
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: "=&r" (r), "=&r" (t), "=m" (*p)
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: "m" (*p), "r" (v)
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: "memory");
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return r;
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}
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# else /* !(_MIPS_ISA >= _MIPS_ISA_MIPS2) */
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_EXTERN_INLINE int
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_test_and_set (int *p, int v) __THROW
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{
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return sysmips (MIPS_ATOMIC_SET, (int) p, v, 0);
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}
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# endif /* !(_MIPS_ISA >= _MIPS_ISA_MIPS2) */
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#endif /* __USE_EXTERN_INLINES */
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__END_DECLS
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#endif /* sys/tas.h */
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