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early-access version 3136

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pineappleEA
2022-11-20 03:30:00 +01:00
parent 9e948367b3
commit 54b4c3c044
6 changed files with 52 additions and 151 deletions
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147
src/common/fiber.cpp
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@@ -1,133 +1,41 @@
// SPDX-FileCopyrightText: Copyright 2020 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include <mutex>
#include "common/assert.h"
#include "common/fiber.h"
#include "common/spin_lock.h"
#include "common/virtual_buffer.h"
#if defined(_WIN32) || defined(WIN32)
#include <windows.h>
#else
#include <boost/context/detail/fcontext.hpp>
#endif
namespace Common {
constexpr std::size_t default_stack_size = 512 * 1024;
struct Fiber::FiberImpl {
SpinLock guard{};
FiberImpl() : stack{default_stack_size}, rewind_stack{default_stack_size} {}
VirtualBuffer<u8> stack;
VirtualBuffer<u8> rewind_stack;
std::mutex guard;
std::function<void()> entry_point;
std::function<void()> rewind_point;
void* rewind_parameter{};
std::shared_ptr<Fiber> previous_fiber;
bool is_thread_fiber{};
bool released{};
#if defined(_WIN32) || defined(WIN32)
LPVOID handle = nullptr;
LPVOID rewind_handle = nullptr;
#else
alignas(64) std::array<u8, default_stack_size> stack;
alignas(64) std::array<u8, default_stack_size> rewind_stack;
u8* stack_limit;
u8* rewind_stack_limit;
boost::context::detail::fcontext_t context;
boost::context::detail::fcontext_t rewind_context;
#endif
u8* stack_limit{};
u8* rewind_stack_limit{};
boost::context::detail::fcontext_t context{};
boost::context::detail::fcontext_t rewind_context{};
};
void Fiber::SetRewindPoint(std::function<void()>&& rewind_func) {
impl->rewind_point = std::move(rewind_func);
}
#if defined(_WIN32) || defined(WIN32)
void Fiber::Start() {
ASSERT(impl->previous_fiber != nullptr);
impl->previous_fiber->impl->guard.unlock();
impl->previous_fiber.reset();
impl->entry_point();
UNREACHABLE();
}
void Fiber::OnRewind() {
ASSERT(impl->handle != nullptr);
DeleteFiber(impl->handle);
impl->handle = impl->rewind_handle;
impl->rewind_handle = nullptr;
impl->rewind_point();
UNREACHABLE();
}
void Fiber::FiberStartFunc(void* fiber_parameter) {
auto* fiber = static_cast<Fiber*>(fiber_parameter);
fiber->Start();
}
void Fiber::RewindStartFunc(void* fiber_parameter) {
auto* fiber = static_cast<Fiber*>(fiber_parameter);
fiber->OnRewind();
}
Fiber::Fiber(std::function<void()>&& entry_point_func) : impl{std::make_unique<FiberImpl>()} {
impl->entry_point = std::move(entry_point_func);
impl->handle = CreateFiber(default_stack_size, &FiberStartFunc, this);
}
Fiber::Fiber() : impl{std::make_unique<FiberImpl>()} {}
Fiber::~Fiber() {
if (impl->released) {
return;
}
// Make sure the Fiber is not being used
const bool locked = impl->guard.try_lock();
ASSERT_MSG(locked, "Destroying a fiber that's still running");
if (locked) {
impl->guard.unlock();
}
DeleteFiber(impl->handle);
}
void Fiber::Exit() {
ASSERT_MSG(impl->is_thread_fiber, "Exitting non main thread fiber");
if (!impl->is_thread_fiber) {
return;
}
ConvertFiberToThread();
impl->guard.unlock();
impl->released = true;
}
void Fiber::Rewind() {
ASSERT(impl->rewind_point);
ASSERT(impl->rewind_handle == nullptr);
impl->rewind_handle = CreateFiber(default_stack_size, &RewindStartFunc, this);
SwitchToFiber(impl->rewind_handle);
}
void Fiber::YieldTo(std::shared_ptr<Fiber> from, std::shared_ptr<Fiber> to) {
ASSERT_MSG(from != nullptr, "Yielding fiber is null!");
ASSERT_MSG(to != nullptr, "Next fiber is null!");
to->impl->guard.lock();
to->impl->previous_fiber = from;
SwitchToFiber(to->impl->handle);
ASSERT(from->impl->previous_fiber != nullptr);
from->impl->previous_fiber->impl->guard.unlock();
from->impl->previous_fiber.reset();
}
std::shared_ptr<Fiber> Fiber::ThreadToFiber() {
std::shared_ptr<Fiber> fiber = std::shared_ptr<Fiber>{new Fiber()};
fiber->impl->guard.lock();
fiber->impl->handle = ConvertThreadToFiber(nullptr);
fiber->impl->is_thread_fiber = true;
return fiber;
}
#else
void Fiber::Start(boost::context::detail::transfer_t& transfer) {
ASSERT(impl->previous_fiber != nullptr);
impl->previous_fiber->impl->context = transfer.fctx;
@@ -199,16 +107,22 @@ void Fiber::Rewind() {
boost::context::detail::jump_fcontext(impl->rewind_context, this);
}
void Fiber::YieldTo(std::shared_ptr<Fiber> from, std::shared_ptr<Fiber> to) {
ASSERT_MSG(from != nullptr, "Yielding fiber is null!");
ASSERT_MSG(to != nullptr, "Next fiber is null!");
to->impl->guard.lock();
to->impl->previous_fiber = from;
auto transfer = boost::context::detail::jump_fcontext(to->impl->context, to.get());
ASSERT(from->impl->previous_fiber != nullptr);
from->impl->previous_fiber->impl->context = transfer.fctx;
from->impl->previous_fiber->impl->guard.unlock();
from->impl->previous_fiber.reset();
void Fiber::YieldTo(std::weak_ptr<Fiber> weak_from, Fiber& to) {
to.impl->guard.lock();
to.impl->previous_fiber = weak_from.lock();
auto transfer = boost::context::detail::jump_fcontext(to.impl->context, &to);
// "from" might no longer be valid if the thread was killed
if (auto from = weak_from.lock()) {
if (from->impl->previous_fiber == nullptr) {
ASSERT_MSG(false, "previous_fiber is nullptr!");
return;
}
from->impl->previous_fiber->impl->context = transfer.fctx;
from->impl->previous_fiber->impl->guard.unlock();
from->impl->previous_fiber.reset();
}
}
std::shared_ptr<Fiber> Fiber::ThreadToFiber() {
@@ -218,5 +132,4 @@ std::shared_ptr<Fiber> Fiber::ThreadToFiber() {
return fiber;
}
#endif
} // namespace Common
} // namespace Common

16
src/common/fiber.h
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@@ -6,11 +6,9 @@
#include <functional>
#include <memory>
#if !defined(_WIN32) && !defined(WIN32)
namespace boost::context::detail {
struct transfer_t;
}
#endif
namespace Common {
@@ -42,7 +40,7 @@ public:
/// Yields control from Fiber 'from' to Fiber 'to'
/// Fiber 'from' must be the currently running fiber.
static void YieldTo(std::shared_ptr<Fiber> from, std::shared_ptr<Fiber> to);
static void YieldTo(std::weak_ptr<Fiber> weak_from, Fiber& to);
[[nodiscard]] static std::shared_ptr<Fiber> ThreadToFiber();
void SetRewindPoint(std::function<void()>&& rewind_func);
@@ -52,26 +50,16 @@ public:
/// Only call from main thread's fiber
void Exit();
/// Changes the start parameter of the fiber. Has no effect if the fiber already started
void SetStartParameter(void* new_parameter);
private:
Fiber();
#if defined(_WIN32) || defined(WIN32)
void OnRewind();
void Start();
static void FiberStartFunc(void* fiber_parameter);
static void RewindStartFunc(void* fiber_parameter);
#else
void OnRewind(boost::context::detail::transfer_t& transfer);
void Start(boost::context::detail::transfer_t& transfer);
static void FiberStartFunc(boost::context::detail::transfer_t transfer);
static void RewindStartFunc(boost::context::detail::transfer_t transfer);
#endif
struct FiberImpl;
std::unique_ptr<FiberImpl> impl;
};
} // namespace Common
} // namespace Common