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Concurrency.h
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230 lines (183 loc) · 6.26 KB
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// Copyright Sebastian Jeckel 2014.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#ifndef REACT_COMMON_CONCURRENCY_H_INCLUDED
#define REACT_COMMON_CONCURRENCY_H_INCLUDED
#pragma once
#include "react/detail/Defs.h"
#include <condition_variable>
#include <mutex>
#include "react/common/RefCounting.h"
/***************************************/ REACT_IMPL_BEGIN /**************************************/
///////////////////////////////////////////////////////////////////////////////////////////////////
/// IWaitingState
///////////////////////////////////////////////////////////////////////////////////////////////////
class IWaitingState
{
public:
virtual inline ~IWaitingState() {}
virtual void Wait() = 0;
virtual void IncWaitCount() = 0;
virtual void DecWaitCount() = 0;
protected:
virtual bool IsRefCounted() const = 0;
virtual void IncRefCount() = 0;
virtual void DecRefCount() = 0;
friend class IntrusiveRefCountingPtr<IWaitingState>;
};
using WaitingStatePtrT = IntrusiveRefCountingPtr<IWaitingState>;
///////////////////////////////////////////////////////////////////////////////////////////////////
/// WaitingStateBase
///////////////////////////////////////////////////////////////////////////////////////////////////
class WaitingStateBase : public IWaitingState
{
public:
virtual inline void Wait() override
{
std::unique_lock<std::mutex> lock(mutex_);
condition_.wait(lock, [this] { return !isWaiting_; });
}
virtual inline void IncWaitCount() override
{
auto oldVal = waitCount_.fetch_add(1, std::memory_order_relaxed);
if (oldVal == 0)
{// mutex_
std::lock_guard<std::mutex> scopedLock(mutex_);
isWaiting_ = true;
}// ~mutex_
}
virtual inline void DecWaitCount() override
{
auto oldVal = waitCount_.fetch_sub(1, std::memory_order_relaxed);
if (oldVal == 1)
{// mutex_
std::lock_guard<std::mutex> scopedLock(mutex_);
isWaiting_ = false;
condition_.notify_all();
}// ~mutex_
}
template <typename F>
bool RunIfWaiting(F&& func)
{// mutex_
std::lock_guard<std::mutex> scopedLock(mutex_);
if (!isWaiting_)
return false;
func();
return true;
}// ~mutex_
private:
std::atomic<uint> waitCount_{ 0 };
std::condition_variable condition_;
std::mutex mutex_;
bool isWaiting_ = false;
};
///////////////////////////////////////////////////////////////////////////////////////////////////
/// UniqueWaitingState
///////////////////////////////////////////////////////////////////////////////////////////////////
class UniqueWaitingState : public WaitingStateBase
{
protected:
// Do nothing
virtual inline bool IsRefCounted() const override { return false; }
virtual inline void IncRefCount() override {}
virtual inline void DecRefCount() override {}
};
///////////////////////////////////////////////////////////////////////////////////////////////////
/// SharedWaitingState
///////////////////////////////////////////////////////////////////////////////////////////////////
class SharedWaitingState : public WaitingStateBase
{
private:
SharedWaitingState() = default;
public:
static inline WaitingStatePtrT Create()
{
return WaitingStatePtrT(new SharedWaitingState());
}
protected:
virtual inline bool IsRefCounted() const override { return true; }
virtual inline void IncRefCount() override
{
refCount_.fetch_add(1, std::memory_order_relaxed);
}
virtual inline void DecRefCount() override
{
auto oldVal = refCount_.fetch_sub(1, std::memory_order_relaxed);
if (oldVal == 1)
delete this;
}
private:
std::atomic<uint> refCount_{ 0 };
};
///////////////////////////////////////////////////////////////////////////////////////////////////
/// SharedWaitingStateCollection
///////////////////////////////////////////////////////////////////////////////////////////////////
class SharedWaitingStateCollection : public IWaitingState
{
private:
SharedWaitingStateCollection(std::vector<WaitingStatePtrT>&& others) :
others_( std::move(others) )
{}
public:
static inline WaitingStatePtrT Create(std::vector<WaitingStatePtrT>&& others)
{
return WaitingStatePtrT(new SharedWaitingStateCollection(std::move(others)));
}
virtual inline bool IsRefCounted() const override { return true; }
virtual inline void Wait() override
{
for (const auto& e : others_)
e->Wait();
}
virtual inline void IncWaitCount() override
{
for (const auto& e : others_)
e->IncWaitCount();
}
virtual inline void DecWaitCount() override
{
for (const auto& e : others_)
e->DecWaitCount();
}
virtual inline void IncRefCount() override
{
refCount_.fetch_add(1, std::memory_order_relaxed);
}
virtual inline void DecRefCount() override
{
auto oldVal = refCount_.fetch_sub(1, std::memory_order_relaxed);
if (oldVal == 1)
delete this;
}
private:
std::atomic<uint> refCount_{ 0 };
std::vector<WaitingStatePtrT> others_;
};
///////////////////////////////////////////////////////////////////////////////////////////////////
/// ConditionalCriticalSection
///////////////////////////////////////////////////////////////////////////////////////////////////
template <typename TMutex, bool is_enabled>
class ConditionalCriticalSection;
template <typename TMutex>
class ConditionalCriticalSection<TMutex,false>
{
public:
template <typename F>
void Access(const F& f) { f(); }
};
template <typename TMutex>
class ConditionalCriticalSection<TMutex,true>
{
public:
template <typename F>
void Access(const F& f)
{// mutex_
std::lock_guard<TMutex> lock(mutex_);
f();
}// ~mutex_
private:
TMutex mutex_;
};
/****************************************/ REACT_IMPL_END /***************************************/
#endif // REACT_COMMON_CONCURRENCY_H_INCLUDED