75927ee462
* client_port: Make all data members private These members don't need to be entirely exposed, we can instead expose an API to operate on them without directly needing to mutate them We can also guard against overflow/API misuse this way as well, given active_sessions is an unsigned value. * make the condition an assert
121 lines
4.7 KiB
C++
121 lines
4.7 KiB
C++
// Copyright 2016 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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#include <tuple>
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#include "core/hle/kernel/client_port.h"
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#include "core/hle/kernel/client_session.h"
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#include "core/hle/kernel/hle_ipc.h"
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#include "core/hle/kernel/server_session.h"
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#include "core/hle/kernel/session.h"
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#include "core/hle/kernel/thread.h"
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namespace Kernel {
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ServerSession::ServerSession() = default;
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ServerSession::~ServerSession() {
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// This destructor will be called automatically when the last ServerSession handle is closed by
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// the emulated application.
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// Decrease the port's connection count.
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if (parent->port)
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parent->port->ConnectionClosed();
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// TODO(Subv): Wake up all the ClientSession's waiting threads and set
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// the SendSyncRequest result to 0xC920181A.
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parent->server = nullptr;
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}
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ResultVal<SharedPtr<ServerSession>> ServerSession::Create(std::string name) {
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SharedPtr<ServerSession> server_session(new ServerSession);
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server_session->name = std::move(name);
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server_session->parent = nullptr;
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return MakeResult(std::move(server_session));
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}
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bool ServerSession::ShouldWait(Thread* thread) const {
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// Closed sessions should never wait, an error will be returned from svcReplyAndReceive.
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if (parent->client == nullptr)
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return false;
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// Wait if we have no pending requests, or if we're currently handling a request.
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return pending_requesting_threads.empty() || currently_handling != nullptr;
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}
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void ServerSession::Acquire(Thread* thread) {
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ASSERT_MSG(!ShouldWait(thread), "object unavailable!");
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// If the client endpoint was closed, don't do anything. This ServerSession is now useless and
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// will linger until its last handle is closed by the running application.
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if (parent->client == nullptr)
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return;
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// We are now handling a request, pop it from the stack.
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ASSERT(!pending_requesting_threads.empty());
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currently_handling = pending_requesting_threads.back();
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pending_requesting_threads.pop_back();
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}
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ResultCode ServerSession::HandleSyncRequest(SharedPtr<Thread> thread) {
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// The ServerSession received a sync request, this means that there's new data available
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// from its ClientSession, so wake up any threads that may be waiting on a svcReplyAndReceive or
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// similar.
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// If this ServerSession has an associated HLE handler, forward the request to it.
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if (hle_handler != nullptr) {
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hle_handler->HandleSyncRequest(SharedPtr<ServerSession>(this));
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}
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if (thread->status == THREADSTATUS_RUNNING) {
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// Put the thread to sleep until the server replies, it will be awoken in
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// svcReplyAndReceive for LLE servers.
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thread->status = THREADSTATUS_WAIT_IPC;
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if (hle_handler != nullptr) {
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// For HLE services, we put the request threads to sleep for a short duration to
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// simulate IPC overhead, but only if the HLE handler didn't put the thread to sleep for
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// other reasons like an async callback. The IPC overhead is needed to prevent
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// starvation when a thread only does sync requests to HLE services while a
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// lower-priority thread is waiting to run.
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// This delay was approximated in a homebrew application by measuring the average time
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// it takes for svcSendSyncRequest to return when performing the SetLcdForceBlack IPC
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// request to the GSP:GPU service in a n3DS with firmware 11.6. The measured values have
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// a high variance and vary between models.
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static constexpr u64 IPCDelayNanoseconds = 39000;
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thread->WakeAfterDelay(IPCDelayNanoseconds);
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} else {
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// Add the thread to the list of threads that have issued a sync request with this
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// server.
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pending_requesting_threads.push_back(std::move(thread));
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}
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}
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// If this ServerSession does not have an HLE implementation, just wake up the threads waiting
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// on it.
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WakeupAllWaitingThreads();
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return RESULT_SUCCESS;
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}
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ServerSession::SessionPair ServerSession::CreateSessionPair(const std::string& name,
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SharedPtr<ClientPort> port) {
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auto server_session = ServerSession::Create(name + "_Server").Unwrap();
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SharedPtr<ClientSession> client_session(new ClientSession);
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client_session->name = name + "_Client";
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std::shared_ptr<Session> parent(new Session);
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parent->client = client_session.get();
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parent->server = server_session.get();
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parent->port = port;
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client_session->parent = parent;
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server_session->parent = parent;
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return std::make_tuple(std::move(server_session), std::move(client_session));
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}
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} // namespace Kernel
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