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/*
* Copyright (c) 2022, Ford Motor Company
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following
* disclaimer in the documentation and/or other materials provided with the
* distribution.
*
* Neither the name of the Ford Motor Company nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "utils/conditional_variable.h"
#include "utils/macro.h"
#include "utils/rwlock.h"
namespace sync_primitives {
/**
* @brief Allows to safely change stored value from different threads.
*
* The usage example:
*
* threads::Atomic<int> i;
*
* i = 5; // here SDL is able to guarantee that this value will be safely
* // assigned even in multi threaded environment.
*/
template <typename T>
class Atomic {
public:
/**
* @brief Atomic allows to construct atomic object.
* The operation is not atomic.
*
* @param value the value to initialize object with.
*/
Atomic(const T& value) : value_(value) {} // NOLINT(runtime/explicit)
/**
* @brief operator = thread safe setter for stored value.
*
* @param val value to assign.
*
* @return mofified value.
*/
T& operator=(const T& val) {
sync_primitives::AutoWriteLock lock(rw_lock_);
value_ = val;
return value_;
}
/**
* @brief operator T thread safe getter
*
* return stored value.
*/
operator T() const {
sync_primitives::AutoReadLock lock(rw_lock_);
return value_;
}
/**
* @brief operator T thread safe getter
*
* return stored value.
*/
template <typename U>
operator U() const {
sync_primitives::AutoReadLock lock(rw_lock_);
return static_cast<U>(value_);
}
private:
T value_;
mutable sync_primitives::RWLock rw_lock_;
};
typedef Atomic<int> atomic_int;
typedef Atomic<int32_t> atomic_int32;
typedef Atomic<uint32_t> atomic_uint32;
typedef Atomic<int64_t> atomic_int64;
typedef Atomic<uint64_t> atomic_uint64;
typedef Atomic<size_t> atomic_size_t;
typedef Atomic<bool> atomic_bool;
} // namespace sync_primitives
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