115 lines
3.6 KiB
C++
115 lines
3.6 KiB
C++
// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
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// SPDX-License-Identifier: GPL-3.0-or-later
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// SPDX-FileCopyrightText: Copyright 2020 yuzu Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#include <thread>
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#include <mutex>
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#include "common/assert.h"
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#include "common/fiber.h"
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#include "common/virtual_buffer.h"
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#include <boost/context/detail/fcontext.hpp>
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namespace Common {
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#ifdef __OPENORBIS__
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constexpr size_t DEFAULT_STACK_SIZE = 128 * 4096;
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#else
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constexpr size_t DEFAULT_STACK_SIZE = 512 * 4096;
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#endif
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constexpr u32 CANARY_VALUE = 0xDEADBEEF;
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struct Fiber::FiberImpl {
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FiberImpl() {}
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u32 canary_1 = CANARY_VALUE;
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std::array<u8, DEFAULT_STACK_SIZE> stack{};
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std::array<u8, DEFAULT_STACK_SIZE> rewind_stack{};
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u32 canary_2 = CANARY_VALUE;
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boost::context::detail::fcontext_t context{};
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boost::context::detail::fcontext_t rewind_context{};
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std::mutex guard;
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std::function<void()> entry_point;
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std::function<void()> rewind_point;
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std::shared_ptr<Fiber> previous_fiber;
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u8* stack_limit = nullptr;
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u8* rewind_stack_limit = nullptr;
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bool is_thread_fiber = false;
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bool released = false;
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};
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void Fiber::SetRewindPoint(std::function<void()>&& rewind_func) {
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impl->rewind_point = std::move(rewind_func);
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}
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Fiber::Fiber(std::function<void()>&& entry_point_func) : impl{std::make_unique<FiberImpl>()} {
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impl->entry_point = std::move(entry_point_func);
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impl->stack_limit = impl->stack.data();
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impl->rewind_stack_limit = impl->rewind_stack.data();
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u8* stack_base = impl->stack_limit + DEFAULT_STACK_SIZE;
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impl->context = boost::context::detail::make_fcontext(stack_base, impl->stack.size(), [](boost::context::detail::transfer_t transfer) -> void {
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auto* fiber = static_cast<Fiber*>(transfer.data);
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ASSERT(fiber && fiber->impl && fiber->impl->previous_fiber && fiber->impl->previous_fiber->impl);
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ASSERT(fiber->impl->canary_1 == CANARY_VALUE);
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ASSERT(fiber->impl->canary_2 == CANARY_VALUE);
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fiber->impl->previous_fiber->impl->context = transfer.fctx;
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fiber->impl->previous_fiber->impl->guard.unlock();
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fiber->impl->previous_fiber.reset();
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fiber->impl->entry_point();
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UNREACHABLE();
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});
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}
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Fiber::Fiber() : impl{std::make_unique<FiberImpl>()} {}
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Fiber::~Fiber() {
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if (!impl->released) {
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// Make sure the Fiber is not being used
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const bool locked = impl->guard.try_lock();
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ASSERT_MSG(locked, "Destroying a fiber that's still running");
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if (locked) {
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impl->guard.unlock();
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}
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}
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}
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void Fiber::Exit() {
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ASSERT_MSG(impl->is_thread_fiber, "Exiting non main thread fiber");
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if (impl->is_thread_fiber) {
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impl->guard.unlock();
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impl->released = true;
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}
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}
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void Fiber::YieldTo(std::weak_ptr<Fiber> weak_from, Fiber& to) {
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to.impl->guard.lock();
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to.impl->previous_fiber = weak_from.lock();
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auto transfer = boost::context::detail::jump_fcontext(to.impl->context, &to);
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// "from" might no longer be valid if the thread was killed
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if (auto from = weak_from.lock()) {
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if (from->impl->previous_fiber == nullptr) {
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ASSERT(false && "previous_fiber is nullptr!");
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} else {
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from->impl->previous_fiber->impl->context = transfer.fctx;
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from->impl->previous_fiber->impl->guard.unlock();
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from->impl->previous_fiber.reset();
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}
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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->impl->guard.lock();
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fiber->impl->is_thread_fiber = true;
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return fiber;
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}
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} // namespace Common
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