0cbcd6ec9a
As means to pave the way for getting rid of global state within core, This eliminates kernel global state by removing all globals. Instead this introduces a KernelCore class which acts as a kernel instance. This instance lives in the System class, which keeps its lifetime contained to the lifetime of the System class. This also forces the kernel types to actually interact with the main kernel instance itself instead of having transient kernel state placed all over several translation units, keeping everything together. It also has a nice consequence of making dependencies much more explicit. This also makes our initialization a tad bit more correct. Previously we were creating a kernel process before the actual kernel was initialized, which doesn't really make much sense. The KernelCore class itself follows the PImpl idiom, which allows keeping all the implementation details sealed away from everything else, which forces the use of the exposed API and allows us to avoid any unnecessary inclusions within the main kernel header.
106 lines
2.4 KiB
C++
106 lines
2.4 KiB
C++
// Copyright 2018 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 <atomic>
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#include <string>
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#include <utility>
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#include <boost/smart_ptr/intrusive_ptr.hpp>
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#include "common/common_types.h"
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namespace Kernel {
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class KernelCore;
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using Handle = u32;
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enum class HandleType : u32 {
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Unknown,
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Event,
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SharedMemory,
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Thread,
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Process,
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AddressArbiter,
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Timer,
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ResourceLimit,
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CodeSet,
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ClientPort,
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ServerPort,
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ClientSession,
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ServerSession,
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};
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enum class ResetType {
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OneShot,
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Sticky,
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Pulse,
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};
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class Object : NonCopyable {
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public:
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explicit Object(KernelCore& kernel);
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virtual ~Object();
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/// Returns a unique identifier for the object. For debugging purposes only.
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u32 GetObjectId() const {
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return object_id.load(std::memory_order_relaxed);
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}
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virtual std::string GetTypeName() const {
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return "[BAD KERNEL OBJECT TYPE]";
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}
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virtual std::string GetName() const {
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return "[UNKNOWN KERNEL OBJECT]";
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}
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virtual HandleType GetHandleType() const = 0;
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/**
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* Check if a thread can wait on the object
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* @return True if a thread can wait on the object, otherwise false
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*/
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bool IsWaitable() const;
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protected:
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/// The kernel instance this object was created under.
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KernelCore& kernel;
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private:
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friend void intrusive_ptr_add_ref(Object*);
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friend void intrusive_ptr_release(Object*);
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std::atomic<u32> ref_count{0};
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std::atomic<u32> object_id{0};
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};
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// Special functions used by boost::instrusive_ptr to do automatic ref-counting
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inline void intrusive_ptr_add_ref(Object* object) {
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object->ref_count.fetch_add(1, std::memory_order_relaxed);
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}
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inline void intrusive_ptr_release(Object* object) {
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if (object->ref_count.fetch_sub(1, std::memory_order_acq_rel) == 1) {
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delete object;
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}
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}
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template <typename T>
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using SharedPtr = boost::intrusive_ptr<T>;
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/**
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* Attempts to downcast the given Object pointer to a pointer to T.
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* @return Derived pointer to the object, or `nullptr` if `object` isn't of type T.
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*/
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template <typename T>
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inline SharedPtr<T> DynamicObjectCast(SharedPtr<Object> object) {
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if (object != nullptr && object->GetHandleType() == T::HANDLE_TYPE) {
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return boost::static_pointer_cast<T>(std::move(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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