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// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include <functional>
#include <map>
#include <mutex>
#include <thread>
#include <vector>
#include "common/polyfill_thread.h"
#include "common/scope_exit.h"
#include "common/thread.h"
#include "core/hle/ipc_helpers.h"
#include "core/hle/kernel/hle_ipc.h"
#include "core/hle/kernel/k_event.h"
#include "core/hle/kernel/k_scoped_resource_reservation.h"
#include "core/hle/kernel/k_session.h"
#include "core/hle/kernel/k_thread.h"
#include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/service_thread.h"
namespace Kernel {
class ServiceThread::Impl final {
public:
explicit Impl(KernelCore& kernel, const std::string& service_name);
~Impl();
void WaitAndProcessImpl();
void SessionClosed(KServerSession* server_session,
std::shared_ptr<SessionRequestManager> manager);
void LoopProcess();
void RegisterServerSession(KServerSession* session,
std::shared_ptr<SessionRequestManager> manager);
private:
KernelCore& kernel;
const std::string m_service_name;
std::jthread m_host_thread{};
std::mutex m_session_mutex{};
std::map<KServerSession*, std::shared_ptr<SessionRequestManager>> m_sessions{};
KEvent* m_wakeup_event{};
KThread* m_thread{};
std::atomic<bool> m_shutdown_requested{};
};
void ServiceThread::Impl::WaitAndProcessImpl() {
// Create local list of waitable sessions.
std::vector<KSynchronizationObject*> objs;
std::vector<std::shared_ptr<SessionRequestManager>> managers;
{
// Lock to get the set.
std::scoped_lock lk{m_session_mutex};
// Reserve the needed quantity.
objs.reserve(m_sessions.size() + 1);
managers.reserve(m_sessions.size());
// Copy to our local list.
for (const auto& [session, manager] : m_sessions) {
objs.push_back(session);
managers.push_back(manager);
}
// Insert the wakeup event at the end.
objs.push_back(&m_wakeup_event->GetReadableEvent());
}
// Wait on the list of sessions.
s32 index{-1};
Result rc = KSynchronizationObject::Wait(kernel, &index, objs.data(),
static_cast<s32>(objs.size()), -1);
ASSERT(!rc.IsFailure());
// If this was the wakeup event, clear it and finish.
if (index >= static_cast<s64>(objs.size() - 1)) {
m_wakeup_event->Clear();
return;
}
// This event is from a server session.
auto* server_session = static_cast<KServerSession*>(objs[index]);
auto& manager = managers[index];
// Fetch the HLE request context.
std::shared_ptr<HLERequestContext> context;
rc = server_session->ReceiveRequest(&context, manager);
// If the session was closed, handle that.
if (rc == ResultSessionClosed) {
SessionClosed(server_session, manager);
// Finish.
return;
}
// TODO: handle other cases
ASSERT(rc == ResultSuccess);
// Perform the request.
Result service_rc = manager->CompleteSyncRequest(server_session, *context);
// Reply to the client.
rc = server_session->SendReplyHLE();
if (rc == ResultSessionClosed || service_rc == IPC::ERR_REMOTE_PROCESS_DEAD) {
SessionClosed(server_session, manager);
return;
}
// TODO: handle other cases
ASSERT(rc == ResultSuccess);
ASSERT(service_rc == ResultSuccess);
}
void ServiceThread::Impl::SessionClosed(KServerSession* server_session,
std::shared_ptr<SessionRequestManager> manager) {
{
// Lock to get the set.
std::scoped_lock lk{m_session_mutex};
// Erase the session.
ASSERT(m_sessions.erase(server_session) == 1);
}
// Close our reference to the server session.
server_session->Close();
}
void ServiceThread::Impl::LoopProcess() {
Common::SetCurrentThreadName(m_service_name.c_str());
kernel.RegisterHostThread(m_thread);
while (!m_shutdown_requested.load()) {
WaitAndProcessImpl();
}
}
void ServiceThread::Impl::RegisterServerSession(KServerSession* server_session,
std::shared_ptr<SessionRequestManager> manager) {
// Open the server session.
server_session->Open();
{
// Lock to get the set.
std::scoped_lock lk{m_session_mutex};
// Insert the session and manager.
m_sessions[server_session] = manager;
}
// Signal the wakeup event.
m_wakeup_event->Signal();
}
ServiceThread::Impl::~Impl() {
// Shut down the processing thread.
m_shutdown_requested.store(true);
m_wakeup_event->Signal();
m_host_thread.join();
// Close all remaining sessions.
for (const auto& [server_session, manager] : m_sessions) {
server_session->Close();
}
// Destroy remaining managers.
m_sessions.clear();
// Close event.
m_wakeup_event->GetReadableEvent().Close();
m_wakeup_event->Close();
// Close thread.
m_thread->Close();
}
ServiceThread::Impl::Impl(KernelCore& kernel_, const std::string& service_name)
: kernel{kernel_}, m_service_name{service_name} {
// Initialize event.
m_wakeup_event = KEvent::Create(kernel);
m_wakeup_event->Initialize(nullptr);
// Initialize thread.
m_thread = KThread::Create(kernel);
ASSERT(KThread::InitializeDummyThread(m_thread, nullptr).IsSuccess());
// Start thread.
m_host_thread = std::jthread([this] { LoopProcess(); });
}
ServiceThread::ServiceThread(KernelCore& kernel, const std::string& name)
: impl{std::make_unique<Impl>(kernel, name)} {}
ServiceThread::~ServiceThread() = default;
void ServiceThread::RegisterServerSession(KServerSession* session,
std::shared_ptr<SessionRequestManager> manager) {
impl->RegisterServerSession(session, manager);
}
} // namespace Kernel
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