src/main/decaf/util/concurrent/atomic/AtomicReference.h

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef _DECAF_UTIL_CONCURRENT_ATOMIC_ATOMICREFERENCE_H_
#define _DECAF_UTIL_CONCURRENT_ATOMIC_ATOMICREFERENCE_H_

#include <decaf/util/Config.h>
#include <decaf/lang/Long.h>
#include <apr_atomic.h>

namespace decaf {
namespace util {
namespace concurrent {
namespace atomic {

    template< typename T >
    class AtomicReference {

        volatile void* value;

    public:

        AtomicReference() : value( NULL ) {}
        AtomicReference( T* value ) : value( (void*)value ) {}

        virtual ~AtomicReference() {}

        T* get() const {
            return (T*)value;
        }

        void set( T* newValue ) {
            apr_atomic_xchgptr( &this->value, (void*)newValue );
        }

        bool compareAndSet( T* expect, T* update ) {
            return apr_atomic_casptr( &this->value, (void*)update, (void*)expect ) == (void*)expect;
        }

        T* getAndSet( T* newValue ) {
            return (T*)apr_atomic_xchgptr( &this->value, (void*)newValue );
        }

        std::string toString() const {
            return decaf::lang::Long::toString( (long long)this->value );
        }

    };

}}}}

#endif /*_DECAF_UTIL_CONCURRENT_ATOMIC_ATOMICREFERENCE_H_*/