1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
|
/*********************************************************************
* NAN - Native Abstractions for Node.js
*
* Copyright (c) 2018 NAN contributors
*
* MIT License <https://github.com/nodejs/nan/blob/master/LICENSE.md>
********************************************************************/
#include <nan.h>
#include "pi_est.h" // NOLINT(build/include_subdir)
#include "async.h" // NOLINT(build/include_subdir)
using v8::Function;
using v8::Local;
using v8::Number;
using v8::Value;
using Nan::AsyncQueueWorker;
using Nan::AsyncWorker;
using Nan::Callback;
using Nan::HandleScope;
using Nan::New;
using Nan::Null;
using Nan::To;
class PiWorker : public AsyncWorker {
public:
PiWorker(Callback *callback, int points)
: AsyncWorker(callback), points(points), estimate(0) {}
~PiWorker() {}
// Executed inside the worker-thread.
// It is not safe to access V8, or V8 data structures
// here, so everything we need for input and output
// should go on `this`.
void Execute () {
estimate = Estimate(points);
}
// Executed when the async work is complete
// this function will be run inside the main event loop
// so it is safe to use V8 again
void HandleOKCallback () {
HandleScope scope;
Local<Value> argv[] = {
Null()
, New<Number>(estimate)
};
callback->Call(2, argv, async_resource);
}
private:
int points;
double estimate;
};
// Asynchronous access to the `Estimate()` function
NAN_METHOD(CalculateAsync) {
int points = To<int>(info[0]).FromJust();
Callback *callback = new Callback(To<Function>(info[1]).ToLocalChecked());
AsyncQueueWorker(new PiWorker(callback, points));
}
|
