Spin.h

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// Honeycomb, Copyright (C) 2015 NewGamePlus Inc.  Distributed under the Boost Software License v1.0.
#pragma once

#include "Honey/Thread/Lock/Unique.h"
#include "Honey/Thread/Atomic.h"
#include "Honey/Thread/Thread.h"

namespace honey
{


class SpinLock
{
public:
    typedef UniqueLock<SpinLock> Scoped;

    SpinLock()                                      : _owner(Thread::threadIdInvalid), _holdCount(0) {}
    SpinLock(const SpinLock&)                       : _owner(Thread::threadIdInvalid), _holdCount(0) {}

    ~SpinLock()                                     {}

    SpinLock& operator=(const SpinLock&)            { return *this; }

    void lock();
    void unlock();

    bool tryLock();
    bool tryLock(MonoClock::Duration time)          { return tryLock(time == time.max() ? MonoClock::TimePoint::max() : MonoClock::now() + time); }
    bool tryLock(MonoClock::TimePoint time);

private:
    bool tryLock_priv(Thread::ThreadId threadId);

    Atomic<Thread::ThreadId> _owner;
    int _holdCount;
};

}