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68 lines
2.0 KiB
C
68 lines
2.0 KiB
C
/*
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* Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
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* Copyright (c) 1996-1999 by Silicon Graphics. All rights reserved.
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* Copyright (c) 1999-2003 by Hewlett-Packard Company. All rights reserved.
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*
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*
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* THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
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* OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
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*
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* Permission is hereby granted to use or copy this program
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* for any purpose, provided the above notices are retained on all copies.
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* Permission to modify the code and to distribute modified code is granted,
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* provided the above notices are retained, and a notice that the code was
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* modified is included with the above copyright notice.
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*
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*/
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#include "../loadstore/atomic_load.h"
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#include "../loadstore/atomic_store.h"
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#include "../test_and_set_t_is_ao_t.h"
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#define AO_NO_DD_ORDERING
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/* Data dependence does not imply read ordering. */
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AO_INLINE void
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AO_nop_full(void)
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{
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__asm__ __volatile__("mb" : : : "memory");
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}
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#define AO_HAVE_nop_full
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AO_INLINE void
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AO_nop_write(void)
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{
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__asm__ __volatile__("wmb" : : : "memory");
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}
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#define AO_HAVE_nop_write
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/* mb should be used for AO_nop_read(). That's the default. */
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/* TODO: implement AO_fetch_and_add explicitly. */
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/* We believe that ldq_l ... stq_c does not imply any memory barrier. */
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AO_INLINE int
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AO_compare_and_swap(volatile AO_t *addr,
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AO_t old, AO_t new_val)
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{
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unsigned long was_equal;
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unsigned long temp;
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__asm__ __volatile__(
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"1: ldq_l %0,%1\n"
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" cmpeq %0,%4,%2\n"
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" mov %3,%0\n"
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" beq %2,2f\n"
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" stq_c %0,%1\n"
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" beq %0,1b\n"
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"2:\n"
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: "=&r" (temp), "+m" (*addr), "=&r" (was_equal)
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: "r" (new_val), "Ir" (old)
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:"memory");
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return (int)was_equal;
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}
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#define AO_HAVE_compare_and_swap
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/* TODO: implement AO_fetch_compare_and_swap */
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