9754bffcc0
- now, we use a ticket lock git-svn-id: http://svn.lfbs.rwth-aachen.de/svn/scc/trunk/MetalSVM@48 315a16e6-25f9-4109-90ae-ca3045a26c18
81 lines
2.1 KiB
C
81 lines
2.1 KiB
C
/*
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* Copyright 2010 Stefan Lankes, Chair for Operating Systems,
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* RWTH Aachen University
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* This file is part of MetalSVM.
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*/
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#ifndef __ARCH_ATOMIC_H__
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#define __ARCH_ATOMIC_H__
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#include <metalsvm/stddef.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if MAX_CORES > 1
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#define LOCK "lock ; "
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#else
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#define LOCK ""
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#endif
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#define ATOMIC_INIT(i) { (i) }
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typedef struct { volatile int32_t counter; } atomic_int32_t;
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/*
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* Intel manuals: If a memory operand is referenced, the processor's locking
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* protocol is automatically implemented for the duration of the exchange
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* operation, regardless of the presence or absence of the LOCK prefix.
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*/
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inline static int32_t atomic_int32_test_and_set(atomic_int32_t* d, int32_t ret) {
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asm volatile ("xchgl %0, %1" : "=r"(ret) : "m"(d->counter), "0"(ret) : "memory");
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return ret;
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}
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inline static int32_t atomic_int32_add(atomic_int32_t *d, int32_t i)
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{
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int32_t res = i;
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asm volatile(LOCK "xaddl %0, %1" : "=r"(i) : "m"(d->counter), "0"(i));
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return res+i;
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}
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inline static int32_t atomic_int32_sub(atomic_int32_t *d, int32_t i)
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{
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return atomic_int32_add(d, -i);
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}
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inline static int32_t atomic_int32_inc(atomic_int32_t* d) {
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return atomic_int32_add(d, 1);
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}
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inline static int32_t atomic_uint32_dec(atomic_int32_t* d) {
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return atomic_int32_add(d, -1);
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}
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inline static int32_t atomic_int32_read(atomic_int32_t *d) {
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return d->counter;
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}
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inline static void atomic_int32_set(atomic_int32_t *d, int32_t v) {
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d->counter = v;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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