common/fiber: Move all member variables into impl class
Hides all of the implementation details for users of the class. This has the benefit of reducing includes and also making the fiber classes movable again.
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Lioncash
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91a45834fd
commit
00fb79b2f3
2 changed files with 86 additions and 89 deletions
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@ -4,6 +4,8 @@
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#include "common/assert.h"
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#include "common/fiber.h"
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#include "common/spin_lock.h"
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#if defined(_WIN32) || defined(WIN32)
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#include <windows.h>
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#else
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@ -14,18 +16,45 @@ namespace Common {
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constexpr std::size_t default_stack_size = 256 * 1024; // 256kb
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#if defined(_WIN32) || defined(WIN32)
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struct Fiber::FiberImpl {
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SpinLock guard{};
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std::function<void(void*)> entry_point;
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std::function<void(void*)> rewind_point;
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void* rewind_parameter{};
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void* start_parameter{};
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std::shared_ptr<Fiber> previous_fiber;
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bool is_thread_fiber{};
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bool released{};
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#if defined(_WIN32) || defined(WIN32)
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LPVOID handle = nullptr;
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LPVOID rewind_handle = nullptr;
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#else
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alignas(64) std::array<u8, default_stack_size> stack;
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alignas(64) std::array<u8, default_stack_size> rewind_stack;
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u8* stack_limit;
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u8* rewind_stack_limit;
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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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#endif
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};
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void Fiber::SetStartParameter(void* new_parameter) {
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impl->start_parameter = new_parameter;
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}
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void Fiber::SetRewindPoint(std::function<void(void*)>&& rewind_func, void* rewind_param) {
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impl->rewind_point = std::move(rewind_func);
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impl->rewind_parameter = rewind_param;
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}
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#if defined(_WIN32) || defined(WIN32)
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void Fiber::Start() {
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ASSERT(previous_fiber != nullptr);
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previous_fiber->guard.unlock();
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previous_fiber.reset();
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entry_point(start_parameter);
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ASSERT(impl->previous_fiber != nullptr);
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impl->previous_fiber->impl->guard.unlock();
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impl->previous_fiber.reset();
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impl->entry_point(impl->start_parameter);
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UNREACHABLE();
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}
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@ -34,58 +63,54 @@ void Fiber::OnRewind() {
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DeleteFiber(impl->handle);
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impl->handle = impl->rewind_handle;
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impl->rewind_handle = nullptr;
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rewind_point(rewind_parameter);
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impl->rewind_point(impl->rewind_parameter);
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UNREACHABLE();
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}
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void Fiber::FiberStartFunc(void* fiber_parameter) {
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auto fiber = static_cast<Fiber*>(fiber_parameter);
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auto* fiber = static_cast<Fiber*>(fiber_parameter);
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fiber->Start();
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}
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void Fiber::RewindStartFunc(void* fiber_parameter) {
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auto fiber = static_cast<Fiber*>(fiber_parameter);
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auto* fiber = static_cast<Fiber*>(fiber_parameter);
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fiber->OnRewind();
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}
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Fiber::Fiber(std::function<void(void*)>&& entry_point_func, void* start_parameter)
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: entry_point{std::move(entry_point_func)}, start_parameter{start_parameter} {
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impl = std::make_unique<FiberImpl>();
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: impl{std::make_unique<FiberImpl>()} {
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impl->entry_point = std::move(entry_point_func);
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impl->start_parameter = start_parameter;
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impl->handle = CreateFiber(default_stack_size, &FiberStartFunc, this);
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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 (released) {
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if (impl->released) {
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return;
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}
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// Make sure the Fiber is not being used
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const bool locked = guard.try_lock();
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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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guard.unlock();
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impl->guard.unlock();
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}
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DeleteFiber(impl->handle);
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}
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void Fiber::Exit() {
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ASSERT_MSG(is_thread_fiber, "Exitting non main thread fiber");
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if (!is_thread_fiber) {
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ASSERT_MSG(impl->is_thread_fiber, "Exitting non main thread fiber");
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if (!impl->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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released = true;
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}
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void Fiber::SetRewindPoint(std::function<void(void*)>&& rewind_func, void* rewind_param) {
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rewind_point = std::move(rewind_func);
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rewind_parameter = rewind_param;
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impl->guard.unlock();
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impl->released = true;
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}
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void Fiber::Rewind() {
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ASSERT(rewind_point);
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ASSERT(impl->rewind_point);
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ASSERT(impl->rewind_handle == nullptr);
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impl->rewind_handle = CreateFiber(default_stack_size, &RewindStartFunc, this);
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SwitchToFiber(impl->rewind_handle);
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@ -94,39 +119,30 @@ void Fiber::Rewind() {
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void Fiber::YieldTo(std::shared_ptr<Fiber> from, std::shared_ptr<Fiber> to) {
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ASSERT_MSG(from != nullptr, "Yielding fiber is null!");
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ASSERT_MSG(to != nullptr, "Next fiber is null!");
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to->guard.lock();
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to->previous_fiber = from;
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to->impl->guard.lock();
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to->impl->previous_fiber = from;
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SwitchToFiber(to->impl->handle);
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ASSERT(from->previous_fiber != nullptr);
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from->previous_fiber->guard.unlock();
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from->previous_fiber.reset();
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ASSERT(from->impl->previous_fiber != nullptr);
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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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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->guard.lock();
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fiber->impl->handle = ConvertThreadToFiber(nullptr);
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fiber->is_thread_fiber = true;
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fiber->impl->is_thread_fiber = true;
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return fiber;
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}
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#else
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struct Fiber::FiberImpl {
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alignas(64) std::array<u8, default_stack_size> stack;
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alignas(64) std::array<u8, default_stack_size> rewind_stack;
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u8* stack_limit;
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u8* rewind_stack_limit;
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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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};
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void Fiber::Start(boost::context::detail::transfer_t& transfer) {
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ASSERT(previous_fiber != nullptr);
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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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entry_point(start_parameter);
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ASSERT(impl->previous_fiber != nullptr);
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impl->previous_fiber->impl->context = transfer.fctx;
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impl->previous_fiber->impl->guard.unlock();
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impl->previous_fiber.reset();
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impl->entry_point(impl->start_parameter);
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UNREACHABLE();
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}
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@ -137,23 +153,24 @@ void Fiber::OnRewind([[maybe_unused]] boost::context::detail::transfer_t& transf
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u8* tmp = impl->stack_limit;
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impl->stack_limit = impl->rewind_stack_limit;
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impl->rewind_stack_limit = tmp;
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rewind_point(rewind_parameter);
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impl->rewind_point(impl->rewind_parameter);
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UNREACHABLE();
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}
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void Fiber::FiberStartFunc(boost::context::detail::transfer_t transfer) {
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auto fiber = static_cast<Fiber*>(transfer.data);
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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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void Fiber::RewindStartFunc(boost::context::detail::transfer_t transfer) {
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auto fiber = static_cast<Fiber*>(transfer.data);
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auto* fiber = static_cast<Fiber*>(transfer.data);
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fiber->OnRewind(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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: entry_point{std::move(entry_point_func)}, start_parameter{start_parameter} {
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impl = std::make_unique<FiberImpl>();
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: impl{std::make_unique<FiberImpl>()} {
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impl->entry_point = std::move(entry_point_func);
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impl->start_parameter = start_parameter;
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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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@ -161,37 +178,31 @@ Fiber::Fiber(std::function<void(void*)>&& entry_point_func, void* start_paramete
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boost::context::detail::make_fcontext(stack_base, impl->stack.size(), FiberStartFunc);
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}
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void Fiber::SetRewindPoint(std::function<void(void*)>&& rewind_func, void* rewind_param) {
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rewind_point = std::move(rewind_func);
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rewind_parameter = rewind_param;
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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 (released) {
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if (impl->released) {
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return;
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}
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// Make sure the Fiber is not being used
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const bool locked = guard.try_lock();
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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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guard.unlock();
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impl->guard.unlock();
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}
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}
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void Fiber::Exit() {
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ASSERT_MSG(is_thread_fiber, "Exitting non main thread fiber");
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if (!is_thread_fiber) {
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ASSERT_MSG(impl->is_thread_fiber, "Exitting non main thread fiber");
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if (!impl->is_thread_fiber) {
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return;
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}
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guard.unlock();
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released = true;
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impl->guard.unlock();
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impl->released = true;
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}
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void Fiber::Rewind() {
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ASSERT(rewind_point);
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ASSERT(impl->rewind_point);
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ASSERT(impl->rewind_context == nullptr);
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u8* stack_base = impl->rewind_stack_limit + default_stack_size;
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impl->rewind_context =
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@ -202,19 +213,19 @@ void Fiber::Rewind() {
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void Fiber::YieldTo(std::shared_ptr<Fiber> from, std::shared_ptr<Fiber> to) {
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ASSERT_MSG(from != nullptr, "Yielding fiber is null!");
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ASSERT_MSG(to != nullptr, "Next fiber is null!");
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to->guard.lock();
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to->previous_fiber = from;
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to->impl->guard.lock();
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to->impl->previous_fiber = from;
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auto transfer = boost::context::detail::jump_fcontext(to->impl->context, to.get());
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ASSERT(from->previous_fiber != nullptr);
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from->previous_fiber->impl->context = transfer.fctx;
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from->previous_fiber->guard.unlock();
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from->previous_fiber.reset();
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ASSERT(from->impl->previous_fiber != nullptr);
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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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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->is_thread_fiber = true;
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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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@ -7,9 +7,6 @@
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#include <functional>
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#include <memory>
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#include "common/common_types.h"
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#include "common/spin_lock.h"
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#if !defined(_WIN32) && !defined(WIN32)
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namespace boost::context::detail {
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struct transfer_t;
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@ -41,8 +38,8 @@ public:
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Fiber(const Fiber&) = delete;
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Fiber& operator=(const Fiber&) = delete;
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Fiber(Fiber&&) = delete;
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Fiber& operator=(Fiber&&) = delete;
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Fiber(Fiber&&) = default;
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Fiber& operator=(Fiber&&) = default;
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/// Yields control from Fiber 'from' to Fiber 'to'
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/// Fiber 'from' must be the currently running fiber.
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@ -57,9 +54,7 @@ public:
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void Exit();
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/// Changes the start parameter of the fiber. Has no effect if the fiber already started
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void SetStartParameter(void* new_parameter) {
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start_parameter = new_parameter;
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}
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void SetStartParameter(void* new_parameter);
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private:
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Fiber();
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@ -77,16 +72,7 @@ private:
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#endif
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struct FiberImpl;
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SpinLock guard{};
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std::function<void(void*)> entry_point;
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std::function<void(void*)> rewind_point;
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void* rewind_parameter{};
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void* start_parameter{};
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std::shared_ptr<Fiber> previous_fiber;
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std::unique_ptr<FiberImpl> impl;
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bool is_thread_fiber{};
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bool released{};
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};
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} // namespace Common
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