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5db2c9b839
2000-04-26 Nathan C. Myers <ncm@cantrip.org>
* bits/basic_string.h: include <bits/atomicity.h> instead
of <atomicity.h>, and use the uglified names.
* config/cpu/*/atomicity.h: replace with bits/atomicity.h;
uglify names, eliminate dependence on <inttypes.h>.
* src/Makefile.in, src/Makefile.am: refer to correct place
for atomicity.h header.
From-SVN: r33503
102 lines
2.4 KiB
C
102 lines
2.4 KiB
C
/* Low-level functions for atomic operations. Alpha version.
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Copyright (C) 1999 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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 _BITS_ATOMICITY_H
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#define _BITS_ATOMICITY_H 1
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typedef int _Atomic_word;
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static inline _Atomic_word
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__attribute__ ((unused))
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__exchange_and_add (volatile _Atomic_word* __mem, int __val)
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{
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register int __result, __tmp;
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__asm__ __volatile__ (
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"/* Inline exchange & add */\n"
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"1:\t"
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"ldl_l %0,%3\n\t"
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"addl %0,%4,%1\n\t"
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"stl_c %1,%2\n\t"
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"beq %1,2f\n"
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".subsection 1\n"
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"2:\t"
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"br 1b\n"
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".previous\n\t"
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"mb\n\t"
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"/* End exchange & add */"
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: "=&r"(__result), "=&r"(__tmp), "=m"(*__mem)
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: "m" (*__mem), "r"(__val));
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return __result;
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}
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static inline void
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__attribute__ ((unused))
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__atomic_add (volatile _Atomic_word* __mem, int __val)
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{
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register _Atomic_word __result;
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__asm__ __volatile__ (
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"/* Inline exchange & add */\n"
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"1:\t"
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"ldl_l %0,%2\n\t"
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"addl %0,%3,%0\n\t"
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"stl_c %0,%1\n\t"
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"beq %0,2f\n\t"
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".subsection 1\n"
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"2:\t"
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"br 1b\n"
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".previous\n\t"
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"mb\n\t"
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"/* End exchange & add */"
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: "=&r"(__result), "=m"(*__mem)
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: "m" (*__mem), "r"(__val));
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}
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static inline int
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__attribute__ ((unused))
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__compare_and_swap (volatile long *__p, long __oldval, long __newval)
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{
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int __ret;
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__asm__ __volatile__ (
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"/* Inline compare & swap */\n"
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"1:\t"
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"ldq_l %0,%4\n\t"
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"cmpeq %0,%2,%0\n\t"
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"beq %0,3f\n\t"
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"mov %3,%0\n\t"
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"stq_c %0,%1\n\t"
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"beq %0,2f\n\t"
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".subsection 1\n"
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"2:\t"
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"br 1b\n"
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".previous\n\t"
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"3:\t"
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"mb\n\t"
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"/* End compare & swap */"
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: "=&r"(__ret), "=m"(*__p)
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: "r"(__oldval), "r"(__newval), "m"(*__p));
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return __ret;
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}
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#endif /* atomicity.h */
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