diff options
| author | Fernando Sahmkow <fsahmkow27@gmail.com> | 2020-02-27 16:32:47 -0400 |
|---|---|---|
| committer | Fernando Sahmkow <fsahmkow27@gmail.com> | 2020-06-18 16:29:25 -0400 |
| commit | 137d862d9b275209b3d62a413396a15e9e14b4b4 (patch) | |
| tree | b2cdf3e5ac626e5c054c1df190b9371a11d2d694 /src/common/fiber.cpp | |
| parent | 41013381d69f952f78b85de3ce226c1499d889b6 (diff) | |
Common/Fiber: Implement Rewinding.
Diffstat (limited to 'src/common/fiber.cpp')
| -rw-r--r-- | src/common/fiber.cpp | 32 |
1 files changed, 30 insertions, 2 deletions
diff --git a/src/common/fiber.cpp b/src/common/fiber.cpp index e4ecc73df3..f61479e132 100644 --- a/src/common/fiber.cpp +++ b/src/common/fiber.cpp @@ -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; |