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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 <memory>
#include <vector>
#include "core/hle/kernel/object.h"
namespace Kernel {
class KernelCore;
class Thread;
/// Class that represents a Kernel object that a thread can be waiting on
class SynchronizationObject : public Object {
public:
explicit SynchronizationObject(KernelCore& kernel);
~SynchronizationObject() override;
/**
* 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;
/// Signal this object
virtual void Signal();
virtual bool IsSignaled() const {
return is_signaled;
}
/**
* Add a thread to wait on this object
* @param thread Pointer to thread to add
*/
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
*/
void RemoveWaitingThread(std::shared_ptr<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.
*/
void WakeupAllWaitingThreads();
/**
* Wakes up a single thread waiting on this object.
* @param thread Thread that is waiting on this object to wakeup.
*/
void WakeupWaitingThread(std::shared_ptr<Thread> thread);
/// 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;
protected:
bool is_signaled{}; // Tells if this sync object is signalled;
private:
/// Threads waiting for this object to become available
std::vector<std::shared_ptr<Thread>> waiting_threads;
};
// Specialization of DynamicObjectCast for SynchronizationObjects
template <>
inline std::shared_ptr<SynchronizationObject> DynamicObjectCast<SynchronizationObject>(
std::shared_ptr<Object> object) {
if (object != nullptr && object->IsWaitable()) {
return std::static_pointer_cast<SynchronizationObject>(object);
}
return nullptr;
}
} // namespace Kernel
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