94ee8fc97b
Ported from citra PR #3091 The delay specified here is from a Nintendo 3DS, and should be measured in a Nintendo Switch. This change is enough to prevent Puyo Puyo Tetris's main thread starvation.
128 lines
4.8 KiB
C++
128 lines
4.8 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 <memory>
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#include <string>
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#include "common/assert.h"
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#include "common/common_types.h"
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#include "core/hle/kernel/kernel.h"
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#include "core/hle/kernel/wait_object.h"
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#include "core/hle/result.h"
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#include "core/memory.h"
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namespace Kernel {
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class ClientSession;
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class ClientPort;
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class ServerSession;
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class Session;
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class SessionRequestHandler;
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class Thread;
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class HLERequestContext;
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/**
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* Kernel object representing the server endpoint of an IPC session. Sessions are the basic CTR-OS
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* primitive for communication between different processes, and are used to implement service calls
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* to the various system services.
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*
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* To make a service call, the client must write the command header and parameters to the buffer
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* located at offset 0x80 of the TLS (Thread-Local Storage) area, then execute a SendSyncRequest
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* SVC call with its ClientSession handle. The kernel will read the command header, using it to
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* marshall the parameters to the process at the server endpoint of the session.
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* After the server replies to the request, the response is marshalled back to the caller's
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* TLS buffer and control is transferred back to it.
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*/
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class ServerSession final : public WaitObject {
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public:
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std::string GetTypeName() const override {
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return "ServerSession";
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}
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static const HandleType HANDLE_TYPE = HandleType::ServerSession;
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HandleType GetHandleType() const override {
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return HANDLE_TYPE;
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}
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using SessionPair = std::tuple<SharedPtr<ServerSession>, SharedPtr<ClientSession>>;
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/**
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* Creates a pair of ServerSession and an associated ClientSession.
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* @param name Optional name of the ports.
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* @param client_port Optional The ClientPort that spawned this session.
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* @return The created session tuple
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*/
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static SessionPair CreateSessionPair(const std::string& name = "Unknown",
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SharedPtr<ClientPort> client_port = nullptr);
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/**
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* Sets the HLE handler for the session. This handler will be called to service IPC requests
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* instead of the regular IPC machinery. (The regular IPC machinery is currently not
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* implemented.)
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*/
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void SetHleHandler(std::shared_ptr<SessionRequestHandler> hle_handler_) {
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hle_handler = std::move(hle_handler_);
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}
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/**
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* Handle a sync request from the emulated application.
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* @param thread Thread that initiated the request.
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* @returns ResultCode from the operation.
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*/
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ResultCode HandleSyncRequest(SharedPtr<Thread> thread);
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bool ShouldWait(Thread* thread) const override;
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void Acquire(Thread* thread) override;
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std::string name; ///< The name of this session (optional)
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std::shared_ptr<Session> parent; ///< The parent session, which links to the client endpoint.
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std::shared_ptr<SessionRequestHandler>
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hle_handler; ///< This session's HLE request handler (applicable when not a domain)
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/// This is the list of domain request handlers (after conversion to a domain)
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std::vector<std::shared_ptr<SessionRequestHandler>> domain_request_handlers;
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/// List of threads that are pending a response after a sync request. This list is processed in
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/// a LIFO manner, thus, the last request will be dispatched first.
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/// TODO(Subv): Verify if this is indeed processed in LIFO using a hardware test.
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std::vector<SharedPtr<Thread>> pending_requesting_threads;
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/// Thread whose request is currently being handled. A request is considered "handled" when a
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/// response is sent via svcReplyAndReceive.
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/// TODO(Subv): Find a better name for this.
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SharedPtr<Thread> currently_handling;
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/// Returns true if the session has been converted to a domain, otherwise False
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bool IsDomain() const {
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return !domain_request_handlers.empty();
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}
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/// Converts the session to a domain at the end of the current command
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void ConvertToDomain() {
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convert_to_domain = true;
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}
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private:
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ServerSession();
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~ServerSession() override;
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/**
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* Creates a server session. The server session can have an optional HLE handler,
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* which will be invoked to handle the IPC requests that this session receives.
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* @param name Optional name of the server session.
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* @return The created server session
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*/
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static ResultVal<SharedPtr<ServerSession>> Create(std::string name = "Unknown");
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/// Handles a SyncRequest to a domain, forwarding the request to the proper object or closing an
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/// object handle.
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ResultCode HandleDomainSyncRequest(Kernel::HLERequestContext& context);
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/// When set to True, converts the session to a domain at the end of the command
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bool convert_to_domain{};
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};
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} // namespace Kernel
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