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PromiseProxy.cpp

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#include "PromiseProxy.h"

#include <CoreFoundation/CoreFoundation.h>

#include "BuiltinLoader.h"

#include "Helpers.h"

#include "Runtime.h"

using namespace v8;

namespace tns {

// Reports whether the calling thread runs the isolate's runtime loop. That loop

// is where timers fire and is always being pumped, so a promise resolution is

// marshaled back to its creating thread only when that thread is the runtime

// loop; a promise created elsewhere settles on whichever thread resolves it.

static void IsRuntimeRunloopCallback(const FunctionCallbackInfo<Value>& args) {

Runtime* runtime = Runtime::GetRuntime(args.GetIsolate());

bool isRuntimeLoop =

runtime != nullptr && CFRunLoopGetCurrent() == runtime->RuntimeLoop();

args.GetReturnValue().Set(isRuntimeLoop);

}

void PromiseProxy::Init(v8::Local<v8::Context> context) {

Isolate* isolate = v8::Isolate::GetCurrent();

Local<v8::Function> isRuntimeRunloop;

bool success = v8::Function::New(context, IsRuntimeRunloopCallback)

.ToLocal(&isRuntimeRunloop);

tns::Assert(success, isolate);

Local<Object> binding = Object::New(isolate);

success = binding

->Set(context, tns::ToV8String(isolate, "isRuntimeRunloop"),

isRuntimeRunloop)

.FromMaybe(false);

tns::Assert(success, isolate);

Local<Value> result;

success =

BuiltinLoader::RunBuiltin(context, BuiltinId::kPromiseProxy, binding)

.ToLocal(&result);

tns::Assert(success, isolate);

}

} // namespace tns