cb198d7985
Within the kernel, shared memory and transfer memory facilities exist as completely different kernel objects. They also have different validity checking as well. Therefore, we shouldn't be treating the two as the same kind of memory. They also differ in terms of their behavioral aspect as well. Shared memory is intended for sharing memory between processes, while transfer memory is intended to be for transferring memory to other processes. This breaks out the handling for transfer memory into its own class and treats it as its own kernel object. This is also important when we consider resource limits as well. Particularly because transfer memory is limited by the resource limit value set for it. While we currently don't handle resource limit testing against objects yet (but we do allow setting them), this will make implementing that behavior much easier in the future, as we don't need to distinguish between shared memory and transfer memory allocations in the same place.
104 lines
2.5 KiB
C++
104 lines
2.5 KiB
C++
// Copyright 2018 Citra Emulator Project
|
|
// Licensed under GPLv2 or any later version
|
|
// Refer to the license.txt file included.
|
|
|
|
#pragma once
|
|
|
|
#include <atomic>
|
|
#include <string>
|
|
|
|
#include <boost/smart_ptr/intrusive_ptr.hpp>
|
|
|
|
#include "common/common_types.h"
|
|
|
|
namespace Kernel {
|
|
|
|
class KernelCore;
|
|
|
|
using Handle = u32;
|
|
|
|
enum class HandleType : u32 {
|
|
Unknown,
|
|
WritableEvent,
|
|
ReadableEvent,
|
|
SharedMemory,
|
|
TransferMemory,
|
|
Thread,
|
|
Process,
|
|
AddressArbiter,
|
|
ResourceLimit,
|
|
ClientPort,
|
|
ServerPort,
|
|
ClientSession,
|
|
ServerSession,
|
|
};
|
|
|
|
enum class ResetType {
|
|
OneShot, ///< Reset automatically on object acquisition
|
|
Sticky, ///< Never reset automatically
|
|
};
|
|
|
|
class Object : NonCopyable {
|
|
public:
|
|
explicit Object(KernelCore& kernel);
|
|
virtual ~Object();
|
|
|
|
/// Returns a unique identifier for the object. For debugging purposes only.
|
|
u32 GetObjectId() const {
|
|
return object_id.load(std::memory_order_relaxed);
|
|
}
|
|
|
|
virtual std::string GetTypeName() const {
|
|
return "[BAD KERNEL OBJECT TYPE]";
|
|
}
|
|
virtual std::string GetName() const {
|
|
return "[UNKNOWN KERNEL OBJECT]";
|
|
}
|
|
virtual HandleType GetHandleType() const = 0;
|
|
|
|
/**
|
|
* Check if a thread can wait on the object
|
|
* @return True if a thread can wait on the object, otherwise false
|
|
*/
|
|
bool IsWaitable() const;
|
|
|
|
protected:
|
|
/// The kernel instance this object was created under.
|
|
KernelCore& kernel;
|
|
|
|
private:
|
|
friend void intrusive_ptr_add_ref(Object*);
|
|
friend void intrusive_ptr_release(Object*);
|
|
|
|
std::atomic<u32> ref_count{0};
|
|
std::atomic<u32> object_id{0};
|
|
};
|
|
|
|
// Special functions used by boost::instrusive_ptr to do automatic ref-counting
|
|
inline void intrusive_ptr_add_ref(Object* object) {
|
|
object->ref_count.fetch_add(1, std::memory_order_relaxed);
|
|
}
|
|
|
|
inline void intrusive_ptr_release(Object* object) {
|
|
if (object->ref_count.fetch_sub(1, std::memory_order_acq_rel) == 1) {
|
|
delete object;
|
|
}
|
|
}
|
|
|
|
template <typename T>
|
|
using SharedPtr = boost::intrusive_ptr<T>;
|
|
|
|
/**
|
|
* Attempts to downcast the given Object pointer to a pointer to T.
|
|
* @return Derived pointer to the object, or `nullptr` if `object` isn't of type T.
|
|
*/
|
|
template <typename T>
|
|
inline SharedPtr<T> DynamicObjectCast(SharedPtr<Object> object) {
|
|
if (object != nullptr && object->GetHandleType() == T::HANDLE_TYPE) {
|
|
return boost::static_pointer_cast<T>(object);
|
|
}
|
|
return nullptr;
|
|
}
|
|
|
|
} // namespace Kernel
|