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