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-rw-r--r--src/common/fiber.cpp117
1 files changed, 11 insertions, 106 deletions
diff --git a/src/common/fiber.cpp b/src/common/fiber.cpp
index 3e3029cd1..3c1eefcb7 100644
--- a/src/common/fiber.cpp
+++ b/src/common/fiber.cpp
@@ -5,18 +5,20 @@
#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 = 256 * 1024; // 256kb
+constexpr std::size_t default_stack_size = 256 * 1024;
struct Fiber::FiberImpl {
+ FiberImpl() : stack{default_stack_size}, rewind_stack{default_stack_size} {}
+
+ VirtualBuffer<u8> stack;
+ VirtualBuffer<u8> rewind_stack;
+
SpinLock guard{};
std::function<void(void*)> entry_point;
std::function<void(void*)> rewind_point;
@@ -26,17 +28,10 @@ struct Fiber::FiberImpl {
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::SetStartParameter(void* new_parameter) {
@@ -48,95 +43,6 @@ void Fiber::SetRewindPoint(std::function<void(void*)>&& rewind_func, void* rewin
impl->rewind_parameter = rewind_param;
}
-#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(impl->start_parameter);
- UNREACHABLE();
-}
-
-void Fiber::OnRewind() {
- ASSERT(impl->handle != nullptr);
- DeleteFiber(impl->handle);
- impl->handle = impl->rewind_handle;
- impl->rewind_handle = nullptr;
- impl->rewind_point(impl->rewind_parameter);
- 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(void*)>&& entry_point_func, void* start_parameter)
- : impl{std::make_unique<FiberImpl>()} {
- impl->entry_point = std::move(entry_point_func);
- impl->start_parameter = start_parameter;
- 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;
@@ -229,5 +135,4 @@ std::shared_ptr<Fiber> Fiber::ThreadToFiber() {
return fiber;
}
-#endif
} // namespace Common