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148 lines
3.9 KiB
C++
148 lines
3.9 KiB
C++
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// Copyright 2020 yuzu 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 "common/fiber.h"
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namespace Common {
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#ifdef _MSC_VER
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#include <windows.h>
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struct Fiber::FiberImpl {
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LPVOID handle = nullptr;
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};
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void Fiber::_start([[maybe_unused]] void* parameter) {
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guard.lock();
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if (previous_fiber) {
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previous_fiber->guard.unlock();
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previous_fiber = nullptr;
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}
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entry_point(start_parameter);
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}
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static void __stdcall FiberStartFunc(LPVOID lpFiberParameter)
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{
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auto fiber = static_cast<Fiber *>(lpFiberParameter);
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fiber->_start(nullptr);
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}
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Fiber::Fiber(std::function<void(void*)>&& entry_point_func, void* start_parameter)
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: guard{}, entry_point{std::move(entry_point_func)}, start_parameter{start_parameter}, previous_fiber{} {
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impl = std::make_unique<FiberImpl>();
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impl->handle = CreateFiber(0, &FiberStartFunc, this);
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}
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Fiber::Fiber() : guard{}, entry_point{}, start_parameter{}, previous_fiber{} {
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impl = std::make_unique<FiberImpl>();
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}
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Fiber::~Fiber() {
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// Make sure the Fiber is not being used
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guard.lock();
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guard.unlock();
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DeleteFiber(impl->handle);
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}
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void Fiber::Exit() {
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if (!is_thread_fiber) {
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return;
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}
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ConvertFiberToThread();
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guard.unlock();
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}
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void Fiber::YieldTo(std::shared_ptr<Fiber> from, std::shared_ptr<Fiber> to) {
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to->guard.lock();
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to->previous_fiber = from;
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SwitchToFiber(to->impl->handle);
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auto previous_fiber = from->previous_fiber;
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if (previous_fiber) {
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previous_fiber->guard.unlock();
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previous_fiber.reset();
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}
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}
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std::shared_ptr<Fiber> Fiber::ThreadToFiber() {
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std::shared_ptr<Fiber> fiber = std::shared_ptr<Fiber>{new Fiber()};
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fiber->guard.lock();
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fiber->impl->handle = ConvertThreadToFiber(NULL);
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fiber->is_thread_fiber = true;
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return fiber;
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}
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#else
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#include <boost/context/detail/fcontext.hpp>
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constexpr std::size_t default_stack_size = 1024 * 1024 * 4; // 4MB
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struct Fiber::FiberImpl {
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boost::context::detail::fcontext_t context;
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std::array<u8, default_stack_size> stack;
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};
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void Fiber::_start(void* parameter) {
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guard.lock();
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boost::context::detail::transfer_t* transfer = static_cast<boost::context::detail::transfer_t*>(parameter);
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if (previous_fiber) {
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previous_fiber->impl->context = transfer->fctx;
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previous_fiber->guard.unlock();
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previous_fiber = nullptr;
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}
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entry_point(start_parameter);
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}
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static void FiberStartFunc(boost::context::detail::transfer_t transfer)
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{
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auto fiber = static_cast<Fiber *>(transfer.data);
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fiber->_start(&transfer);
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}
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Fiber::Fiber(std::function<void(void*)>&& entry_point_func, void* start_parameter)
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: guard{}, entry_point{std::move(entry_point_func)}, start_parameter{start_parameter}, previous_fiber{} {
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impl = std::make_unique<FiberImpl>();
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auto start_func = std::bind(&Fiber::start, this);
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impl->context =
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boost::context::detail::make_fcontext(impl->stack.data(), impl->stack.size(), &start_func);
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}
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Fiber::Fiber() : guard{}, entry_point{}, start_parameter{}, previous_fiber{} {
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impl = std::make_unique<FiberImpl>();
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}
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Fiber::~Fiber() {
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// Make sure the Fiber is not being used
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guard.lock();
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guard.unlock();
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}
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void Fiber::Exit() {
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if (!is_thread_fiber) {
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return;
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}
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guard.unlock();
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}
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void Fiber::YieldTo(std::shared_ptr<Fiber> from, std::shared_ptr<Fiber> to) {
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to->guard.lock();
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to->previous_fiber = from;
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auto transfer = boost::context::detail::jump_fcontext(to->impl.context, nullptr);
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auto previous_fiber = from->previous_fiber;
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if (previous_fiber) {
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previous_fiber->impl->context = transfer.fctx;
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previous_fiber->guard.unlock();
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previous_fiber.reset();
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}
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}
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std::shared_ptr<Fiber> Fiber::ThreadToFiber() {
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std::shared_ptr<Fiber> fiber = std::shared_ptr<Fiber>{new Fiber()};
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fiber->is_thread_fiber = true;
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return fiber;
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}
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#endif
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} // namespace Common
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