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/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed 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 ART_RUNTIME_ATOMIC_INTEGER_H_
#define ART_RUNTIME_ATOMIC_INTEGER_H_
#include "cutils/atomic.h"
#include "cutils/atomic-inline.h"
namespace art {
class AtomicInteger {
public:
AtomicInteger() : value_(0) { }
explicit AtomicInteger(int32_t value) : value_(value) { }
// Unsafe = operator for non atomic operations on the integer.
void store(int32_t desired) {
value_ = desired;
}
AtomicInteger& operator=(int32_t desired) {
store(desired);
return *this;
}
int32_t load() const {
return value_;
}
operator int32_t() const {
return load();
}
int32_t fetch_add(const int32_t value) {
return android_atomic_add(value, &value_);
}
int32_t fetch_sub(const int32_t value) {
return android_atomic_add(-value, &value_);
}
int32_t operator++() {
return android_atomic_inc(&value_) + 1;
}
int32_t operator++(int32_t) {
return android_atomic_inc(&value_);
}
int32_t operator--() {
return android_atomic_dec(&value_) - 1;
}
int32_t operator--(int32_t) {
return android_atomic_dec(&value_);
}
bool compare_and_swap(int32_t expected_value, int32_t desired_value) {
return android_atomic_cas(expected_value, desired_value, &value_) == 0;
}
private:
volatile int32_t value_;
};
}
#endif // ART_RUNTIME_ATOMIC_INTEGER_H_
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