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135 lines
3.9 KiB
C
135 lines
3.9 KiB
C
#ifndef ATOMIC_MSC_INCLUDED
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#define ATOMIC_MSC_INCLUDED
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/* Copyright (c) 2006, 2014, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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#include <windows.h>
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static inline int my_atomic_cas32(int32 volatile *a, int32 *cmp, int32 set)
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{
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int32 initial_cmp= *cmp;
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int32 initial_a= InterlockedCompareExchange((volatile LONG*)a,
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set, initial_cmp);
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int ret= (initial_a == initial_cmp);
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if (!ret)
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*cmp= initial_a;
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return ret;
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}
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static inline int my_atomic_cas64(int64 volatile *a, int64 *cmp, int64 set)
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{
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int64 initial_cmp= *cmp;
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int64 initial_a= InterlockedCompareExchange64((volatile LONGLONG*)a,
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(LONGLONG)set,
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(LONGLONG)initial_cmp);
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int ret= (initial_a == initial_cmp);
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if (!ret)
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*cmp= initial_a;
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return ret;
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}
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static inline int my_atomic_casptr(void * volatile *a, void **cmp, void *set)
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{
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void *initial_cmp= *cmp;
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void *initial_a= InterlockedCompareExchangePointer(a, set, initial_cmp);
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int ret= (initial_a == initial_cmp);
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if (!ret)
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*cmp= initial_a;
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return ret;
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}
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static inline int32 my_atomic_add32(int32 volatile *a, int32 v)
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{
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return (int32)InterlockedExchangeAdd((volatile LONG*)a, v);
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}
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static inline int64 my_atomic_add64(int64 volatile *a, int64 v)
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{
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return (int64)InterlockedExchangeAdd64((volatile LONGLONG*)a, (LONGLONG)v);
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}
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static inline int32 my_atomic_load32(int32 volatile *a)
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{
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return (int32)InterlockedCompareExchange((volatile LONG *)a, 0, 0);
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}
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static inline int64 my_atomic_load64(int64 volatile *a)
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{
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return (int64)InterlockedCompareExchange64((volatile LONGLONG *)a, 0, 0);
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}
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static inline void* my_atomic_loadptr(void * volatile *a)
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{
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return InterlockedCompareExchangePointer(a, 0, 0);
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}
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static inline int32 my_atomic_fas32(int32 volatile *a, int32 v)
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{
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return (int32)InterlockedExchange((volatile LONG*)a, v);
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}
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static inline int64 my_atomic_fas64(int64 volatile *a, int64 v)
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{
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return (int64)InterlockedExchange64((volatile LONGLONG*)a, v);
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}
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static inline void * my_atomic_fasptr(void * volatile *a, void * v)
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{
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return InterlockedExchangePointer(a, v);
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}
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static inline void my_atomic_store32(int32 volatile *a, int32 v)
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{
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(void)InterlockedExchange((volatile LONG*)a, v);
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}
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static inline void my_atomic_store64(int64 volatile *a, int64 v)
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{
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(void)InterlockedExchange64((volatile LONGLONG*)a, v);
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}
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static inline void my_atomic_storeptr(void * volatile *a, void *v)
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{
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(void)InterlockedExchangePointer(a, v);
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}
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/*
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my_yield_processor (equivalent of x86 PAUSE instruction) should be used
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to improve performance on hyperthreaded CPUs. Intel recommends to use it in
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spin loops also on non-HT machines to reduce power consumption (see e.g
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http://softwarecommunity.intel.com/articles/eng/2004.htm)
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Running benchmarks for spinlocks implemented with InterlockedCompareExchange
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and YieldProcessor shows that much better performance is achieved by calling
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YieldProcessor in a loop - that is, yielding longer. On Intel boxes setting
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loop count in the range 200-300 brought best results.
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*/
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#define YIELD_LOOPS 200
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static inline int my_yield_processor()
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{
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int i;
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for (i=0; i<YIELD_LOOPS; i++)
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{
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YieldProcessor();
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}
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return 1;
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}
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#define LF_BACKOFF my_yield_processor()
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#endif /* ATOMIC_MSC_INCLUDED */
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