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// Copyright 2014 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include <functional>
#include <memory>
#include <vector>
#include "common/common_types.h"
#include "core/hle/kernel/object.h"
namespace Kernel {
class Thread;
/// Class that represents a Kernel object that a thread can be waiting on
class WaitObject : public Object {
public:
using Object::Object;
/**
* Check if the specified thread should wait until the object is available
* @param thread The thread about which we're deciding.
* @return True if the current thread should wait due to this object being unavailable
*/
virtual bool ShouldWait(const Thread* thread) const = 0;
/// Acquire/lock the object for the specified thread if it is available
virtual void Acquire(Thread* thread) = 0;
/**
* Add a thread to wait on this object
* @param thread Pointer to thread to add
*/
virtual void AddWaitingThread(std::shared_ptr<Thread> thread);
/**
* Removes a thread from waiting on this object (e.g. if it was resumed already)
* @param thread Pointer to thread to remove
*/
virtual void RemoveWaitingThread(Thread* thread);
/**
* Wake up all threads waiting on this object that can be awoken, in priority order,
* and set the synchronization result and output of the thread.
*/
virtual void WakeupAllWaitingThreads();
/// Obtains the highest priority thread that is ready to run from this object's waiting list.
std::shared_ptr<Thread> GetHighestPriorityReadyThread() const;
/// Get a const reference to the waiting threads list for debug use
const std::vector<std::shared_ptr<Thread>>& GetWaitingThreads() const;
/// Sets a callback which is called when the object becomes available
void SetHLENotifier(std::function<void()> callback);
private:
/// Threads waiting for this object to become available
std::vector<std::shared_ptr<Thread>> waiting_threads;
/// Function to call when this object becomes available
std::function<void()> hle_notifier;
private:
friend class boost::serialization::access;
template <class Archive>
void serialize(Archive& ar, const unsigned int);
};
// Specialization of DynamicObjectCast for WaitObjects
template <>
inline std::shared_ptr<WaitObject> DynamicObjectCast<WaitObject>(std::shared_ptr<Object> object) {
if (object != nullptr && object->IsWaitable()) {
return std::static_pointer_cast<WaitObject>(object);
}
return nullptr;
}
} // namespace Kernel
BOOST_CLASS_EXPORT_KEY(Kernel::WaitObject)
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