120 lines
3.6 KiB
C++
120 lines
3.6 KiB
C++
// SPDX-FileCopyrightText: Copyright 2020 yuzu Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#include <condition_variable>
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#include <functional>
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#include <mutex>
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#include <thread>
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#include <vector>
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#include <queue>
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#include "common/scope_exit.h"
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#include "common/thread.h"
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#include "core/hle/kernel/k_session.h"
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#include "core/hle/kernel/k_thread.h"
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#include "core/hle/kernel/kernel.h"
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#include "core/hle/kernel/service_thread.h"
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namespace Kernel {
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class ServiceThread::Impl final {
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public:
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explicit Impl(KernelCore& kernel, std::size_t num_threads, const std::string& name);
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~Impl();
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void QueueSyncRequest(KSession& session, std::shared_ptr<HLERequestContext>&& context);
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private:
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std::vector<std::jthread> threads;
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std::queue<std::function<void()>> requests;
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std::mutex queue_mutex;
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std::condition_variable_any condition;
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const std::string service_name;
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};
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ServiceThread::Impl::Impl(KernelCore& kernel, std::size_t num_threads, const std::string& name)
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: service_name{name} {
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for (std::size_t i = 0; i < num_threads; ++i) {
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threads.emplace_back([this, &kernel](std::stop_token stop_token) {
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Common::SetCurrentThreadName(std::string{service_name}.c_str());
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// Wait for first request before trying to acquire a render context
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{
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std::unique_lock lock{queue_mutex};
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condition.wait(lock, stop_token, [this] { return !requests.empty(); });
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}
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if (stop_token.stop_requested()) {
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return;
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}
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// Allocate a dummy guest thread for this host thread.
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kernel.RegisterHostThread();
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while (true) {
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std::function<void()> task;
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{
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std::unique_lock lock{queue_mutex};
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condition.wait(lock, stop_token, [this] { return !requests.empty(); });
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if (stop_token.stop_requested()) {
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return;
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}
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if (requests.empty()) {
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continue;
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}
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task = std::move(requests.front());
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requests.pop();
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}
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task();
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}
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});
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}
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}
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void ServiceThread::Impl::QueueSyncRequest(KSession& session,
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std::shared_ptr<HLERequestContext>&& context) {
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{
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std::unique_lock lock{queue_mutex};
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auto* server_session{&session.GetServerSession()};
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// Open a reference to the session to ensure it is not closes while the service request
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// completes asynchronously.
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server_session->Open();
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requests.emplace([server_session, context{std::move(context)}]() {
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// Close the reference.
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SCOPE_EXIT({ server_session->Close(); });
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// Complete the service request.
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server_session->CompleteSyncRequest(*context);
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});
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}
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condition.notify_one();
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}
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ServiceThread::Impl::~Impl() {
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condition.notify_all();
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for (auto& thread : threads) {
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thread.request_stop();
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thread.join();
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}
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}
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ServiceThread::ServiceThread(KernelCore& kernel, std::size_t num_threads, const std::string& name)
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: impl{std::make_unique<Impl>(kernel, num_threads, name)} {}
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ServiceThread::~ServiceThread() = default;
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void ServiceThread::QueueSyncRequest(KSession& session,
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std::shared_ptr<HLERequestContext>&& context) {
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impl->QueueSyncRequest(session, std::move(context));
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}
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} // namespace Kernel
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