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#include"fiber.h"
#include"primitives.h"
#include<iostream>
Fiber* Fiber::current_fiber_ = nullptr;
Fiber* Fiber::main_fiber_ = nullptr;
uv_loop_t* Fiber::event_loop_ = nullptr;
// --- Common Implementation ---
voidFiber::init(v8::Isolate* isolate, uv_loop_t* loop) {
event_loop_ = loop;
main_fiber_ = newFiber(isolate);
}
voidFiber::set_main_context(v8::Local<v8::Context> context) {
if (main_fiber_) {
main_fiber_->v8_context_.Reset(main_fiber_->isolate_, context);
}
}
Fiber* Fiber::get_current() { return current_fiber_; }
uv_loop_t* Fiber::get_loop() { return event_loop_; }
Fiber::~Fiber() {
func_.Reset();
resume_value.Reset();
js_object.Reset();
#ifdef _WIN32
if (context_ != main_fiber_->context_) {
DeleteFiber(context_);
}
#else
delete[] stack_;
#endif
}
voidFiber::run() {
v8::Isolate::Scope isolate_scope(isolate_);
v8::HandleScope handle_scope(isolate_);
v8::Local<v8::Context> context = isolate_->GetCurrentContext();
v8_context_.Reset(isolate_, context);
v8::Local<v8::Function> func = func_.Get(isolate_);
v8::TryCatch try_catch(isolate_);
v8::MaybeLocal<v8::Value> result = func->Call(context, context->Global(), 0, nullptr);
if (result.IsEmpty() && try_catch.HasCaught()) {
ReportException(isolate_, &try_catch);
}
state_ = DONE;
}
// --- Windows Implementation ---
#ifdef _WIN32
Fiber::Fiber(v8::Isolate* isolate) : isolate_(isolate), state_(NEW) {
context_ = ConvertThreadToFiber(nullptr);
current_fiber_ = this;
state_ = RUNNING;
js_object.Reset(isolate, v8::Object::New(isolate));
}
Fiber::Fiber(v8::Isolate* isolate, v8::Local<v8::Function> func)
: isolate_(isolate), state_(NEW) {
func_.Reset(isolate, func);
js_object.Reset(isolate, v8::Object::New(isolate));
context_ = CreateFiber(STACK_SIZE, fiber_entry, this);
}
voidFiber::yield() {
Fiber* yielding_fiber = current_fiber_;
yielding_fiber->state_ = SUSPENDED;
current_fiber_ = main_fiber_;
SwitchToFiber(main_fiber_->context_);
}
voidFiber::resume(Fiber* fiber) {
current_fiber_ = fiber;
fiber->state_ = RUNNING;
SwitchToFiber(fiber->context_);
if (fiber->state_ == DONE) {
delete fiber;
current_fiber_ = main_fiber_;
}
}
VOIDCALLBACKFiber::fiber_entry(PVOID lpParameter) {
Fiber* self = static_cast<Fiber*>(lpParameter);
self->run();
yield();
}
#else// --- POSIX Implementation ---
Fiber::Fiber(v8::Isolate* isolate) : isolate_(isolate), state_(NEW), stack_(nullptr) {
context_ = &uctx_;
getcontext(context_);
current_fiber_ = this;
state_ = RUNNING;
js_object.Reset(isolate, v8::Object::New(isolate));
}
Fiber::Fiber(v8::Isolate* isolate, v8::Local<v8::Function> func)
: isolate_(isolate), state_(NEW) {
func_.Reset(isolate, func);
js_object.Reset(isolate, v8::Object::New(isolate));
context_ = &uctx_;
getcontext(context_);
stack_ = newchar[STACK_SIZE];
context_->uc_stack.ss_sp = stack_;
context_->uc_stack.ss_size = STACK_SIZE;
context_->uc_link = &main_fiber_->uctx_;
makecontext(context_, fiber_entry, 0);
}
voidFiber::yield() {
Fiber* yielding_fiber = current_fiber_;
yielding_fiber->state_ = SUSPENDED;
current_fiber_ = main_fiber_;
swapcontext(yielding_fiber->context_, main_fiber_->context_);
}
voidFiber::resume(Fiber* fiber) {
current_fiber_ = fiber;
fiber->state_ = RUNNING;
swapcontext(main_fiber_->context_, fiber->context_);
if (fiber->state_ == DONE) {
delete fiber;
current_fiber_ = main_fiber_;
}
}
voidFiber::fiber_entry() {
current_fiber_->run();
}
#endif
// --- Primitives exposed to JS ---
structSleepContext : publicAsyncContext {
uv_timer_t timer;
SleepContext(Fiber* f) : AsyncContext(f) {
timer.data = this;
}
// sleep() just resolves to undefined on success.
v8::Local<v8::Value> CreateResultValue(v8::Isolate* isolate) override {
returnv8::Undefined(isolate);
}
};
voidOnSleepTimer(uv_timer_t* handle) {
SleepContext* context = static_cast<SleepContext*>(handle->data);
context->result = 0; // Success
// Don't resume directly. Queue for the main loop.
QueueFiberToResume(context);
uv_close((uv_handle_t*)handle, [](uv_handle_t* h){
// The context is deleted in OnFibersToResume, not here.
// We just need to free the handle's memory if it was allocated separately, which it isn't.
});
}
voidFiber_Sleep(const v8::FunctionCallbackInfo<v8::Value>& args) {
int64_t ms = args[0].As<v8::BigInt>()->Int64Value();
SleepContext* context = newSleepContext(Fiber::get_current());
uv_timer_init(Fiber::get_loop(), &context->timer);
uv_timer_start(&context->timer, OnSleepTimer, ms, 0);
Fiber::yield();
// No return value needed, as sleep does not return anything.
}
voidFiber_Current(const v8::FunctionCallbackInfo<v8::Value>& args) {
args.GetReturnValue().Set(Fiber::get_current()->js_object.Get(args.GetIsolate()));
}
voidFiber_Run(const v8::FunctionCallbackInfo<v8::Value>& args) {
v8::Isolate* isolate = args.GetIsolate();
v8::Local<v8::Function> func = args[0].As<v8::Function>();
Fiber* f = newFiber(isolate, func);
Fiber::resume(f);
}
voidInitializeFibers(v8::Isolate* isolate, v8::Local<v8::Object> exports) {
v8::Local<v8::Context> context = isolate->GetCurrentContext();
v8::Local<v8::Object> fiber_obj = v8::Object::New(isolate);
SET_METHOD(fiber_obj, "run", Fiber_Run);
SET_METHOD(fiber_obj, "current", Fiber_Current);
SET_METHOD(fiber_obj, "sleep", Fiber_Sleep);
exports->Set(context, v8::String::NewFromUtf8(isolate, "fiber").ToLocalChecked(), fiber_obj).Check();
}