147 lines
3.8 KiB
C++
147 lines
3.8 KiB
C++
// Copyright 2020 yuzu Emulator Project
|
|
// Licensed under GPLv2 or any later version
|
|
// Refer to the license.txt file included.
|
|
|
|
#include "common/fiber.h"
|
|
#ifdef _MSC_VER
|
|
#include <windows.h>
|
|
#else
|
|
#include <boost/context/detail/fcontext.hpp>
|
|
#endif
|
|
|
|
namespace Common {
|
|
|
|
#ifdef _MSC_VER
|
|
|
|
struct Fiber::FiberImpl {
|
|
LPVOID handle = nullptr;
|
|
};
|
|
|
|
void Fiber::start() {
|
|
if (previous_fiber) {
|
|
previous_fiber->guard.unlock();
|
|
previous_fiber = nullptr;
|
|
}
|
|
entry_point(start_parameter);
|
|
}
|
|
|
|
void __stdcall Fiber::FiberStartFunc(void* fiber_parameter)
|
|
{
|
|
auto fiber = static_cast<Fiber *>(fiber_parameter);
|
|
fiber->start();
|
|
}
|
|
|
|
Fiber::Fiber(std::function<void(void*)>&& entry_point_func, void* start_parameter)
|
|
: guard{}, entry_point{std::move(entry_point_func)}, start_parameter{start_parameter}, previous_fiber{} {
|
|
impl = std::make_unique<FiberImpl>();
|
|
impl->handle = CreateFiber(0, &FiberStartFunc, this);
|
|
}
|
|
|
|
Fiber::Fiber() : guard{}, entry_point{}, start_parameter{}, previous_fiber{} {
|
|
impl = std::make_unique<FiberImpl>();
|
|
}
|
|
|
|
Fiber::~Fiber() {
|
|
// Make sure the Fiber is not being used
|
|
guard.lock();
|
|
guard.unlock();
|
|
DeleteFiber(impl->handle);
|
|
}
|
|
|
|
void Fiber::Exit() {
|
|
if (!is_thread_fiber) {
|
|
return;
|
|
}
|
|
ConvertFiberToThread();
|
|
guard.unlock();
|
|
}
|
|
|
|
void Fiber::YieldTo(std::shared_ptr<Fiber> from, std::shared_ptr<Fiber> to) {
|
|
to->guard.lock();
|
|
to->previous_fiber = from;
|
|
SwitchToFiber(to->impl->handle);
|
|
auto previous_fiber = from->previous_fiber;
|
|
if (previous_fiber) {
|
|
previous_fiber->guard.unlock();
|
|
previous_fiber.reset();
|
|
}
|
|
}
|
|
|
|
std::shared_ptr<Fiber> Fiber::ThreadToFiber() {
|
|
std::shared_ptr<Fiber> fiber = std::shared_ptr<Fiber>{new Fiber()};
|
|
fiber->guard.lock();
|
|
fiber->impl->handle = ConvertThreadToFiber(NULL);
|
|
fiber->is_thread_fiber = true;
|
|
return fiber;
|
|
}
|
|
|
|
#else
|
|
|
|
constexpr std::size_t default_stack_size = 1024 * 1024 * 4; // 4MB
|
|
|
|
struct alignas(64) Fiber::FiberImpl {
|
|
std::array<u8, default_stack_size> stack;
|
|
boost::context::detail::fcontext_t context;
|
|
};
|
|
|
|
void Fiber::start(boost::context::detail::transfer_t& transfer) {
|
|
if (previous_fiber) {
|
|
previous_fiber->impl->context = transfer.fctx;
|
|
previous_fiber->guard.unlock();
|
|
previous_fiber = nullptr;
|
|
}
|
|
entry_point(start_parameter);
|
|
}
|
|
|
|
void Fiber::FiberStartFunc(boost::context::detail::transfer_t transfer)
|
|
{
|
|
auto fiber = static_cast<Fiber *>(transfer.data);
|
|
fiber->start(transfer);
|
|
}
|
|
|
|
Fiber::Fiber(std::function<void(void*)>&& entry_point_func, void* start_parameter)
|
|
: guard{}, entry_point{std::move(entry_point_func)}, start_parameter{start_parameter}, previous_fiber{} {
|
|
impl = std::make_unique<FiberImpl>();
|
|
auto start_func = std::bind(&Fiber::start, this);
|
|
impl->context =
|
|
boost::context::detail::make_fcontext(impl->stack.data(), impl->stack.size(), &start_func);
|
|
}
|
|
|
|
Fiber::Fiber() : guard{}, entry_point{}, start_parameter{}, previous_fiber{} {
|
|
impl = std::make_unique<FiberImpl>();
|
|
}
|
|
|
|
Fiber::~Fiber() {
|
|
// Make sure the Fiber is not being used
|
|
guard.lock();
|
|
guard.unlock();
|
|
}
|
|
|
|
void Fiber::Exit() {
|
|
if (!is_thread_fiber) {
|
|
return;
|
|
}
|
|
guard.unlock();
|
|
}
|
|
|
|
void Fiber::YieldTo(std::shared_ptr<Fiber> from, std::shared_ptr<Fiber> to) {
|
|
to->guard.lock();
|
|
to->previous_fiber = from;
|
|
auto transfer = boost::context::detail::jump_fcontext(to->impl.context, nullptr);
|
|
auto previous_fiber = from->previous_fiber;
|
|
if (previous_fiber) {
|
|
previous_fiber->impl->context = transfer.fctx;
|
|
previous_fiber->guard.unlock();
|
|
previous_fiber.reset();
|
|
}
|
|
}
|
|
|
|
std::shared_ptr<Fiber> Fiber::ThreadToFiber() {
|
|
std::shared_ptr<Fiber> fiber = std::shared_ptr<Fiber>{new Fiber()};
|
|
fiber->guard.lock();
|
|
fiber->is_thread_fiber = true;
|
|
return fiber;
|
|
}
|
|
|
|
#endif
|
|
} // namespace Common
|