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Common/Fiber: Implement Rewinding.

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This commit is contained in:
Fernando Sahmkow 2020-02-27 16:32:47 -04:00
parent a42b226559
commit 1460bdc5ab
3 changed files with 84 additions and 2 deletions
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32
src/common/fiber.cpp
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@ -12,10 +12,13 @@
namespace Common {
constexpr std::size_t default_stack_size = 256 * 1024; // 256kb
#if defined(_WIN32) || defined(WIN32)
struct Fiber::FiberImpl {
LPVOID handle = nullptr;
LPVOID rewind_handle = nullptr;
};
void Fiber::start() {
@ -26,15 +29,29 @@ void Fiber::start() {
UNREACHABLE();
}
void Fiber::onRewind() {
ASSERT(impl->handle != nullptr);
DeleteFiber(impl->handle);
impl->handle = impl->rewind_handle;
impl->rewind_handle = nullptr;
rewind_point(rewind_parameter);
UNREACHABLE();
}
void __stdcall Fiber::FiberStartFunc(void* fiber_parameter) {
auto fiber = static_cast<Fiber*>(fiber_parameter);
fiber->start();
}
void __stdcall Fiber::RewindStartFunc(void* fiber_parameter) {
auto fiber = static_cast<Fiber*>(fiber_parameter);
fiber->onRewind();
}
Fiber::Fiber(std::function<void(void*)>&& entry_point_func, void* start_parameter)
: entry_point{std::move(entry_point_func)}, start_parameter{start_parameter} {
impl = std::make_unique<FiberImpl>();
impl->handle = CreateFiber(0, &FiberStartFunc, this);
impl->handle = CreateFiber(default_stack_size, &FiberStartFunc, this);
}
Fiber::Fiber() {
@ -60,6 +77,18 @@ void Fiber::Exit() {
guard.unlock();
}
void Fiber::SetRewindPoint(std::function<void(void*)>&& rewind_func, void* start_parameter) {
rewind_point = std::move(rewind_func);
rewind_parameter = start_parameter;
}
void Fiber::Rewind() {
ASSERT(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!");
@ -81,7 +110,6 @@ std::shared_ptr<Fiber> Fiber::ThreadToFiber() {
}
#else
constexpr std::size_t default_stack_size = 1024 * 1024; // 1MB
struct Fiber::FiberImpl {
alignas(64) std::array<u8, default_stack_size> stack;