How can a child worker send message to parent process in Deno?

Question

From this answer, I know that a parent process can talk to a child worker, but how about the other way around?

Marcos Casagrande · Accepted Answer · 2020-05-30T12:51:18.900

4

From the worker you have to use Worker.postMessage

self.postMessage('hi')

And in the main process:

const worker = new Worker("./worker.js", { type: "module", deno: true });

worker.addEventListener('message', message => {
    console.log('message', message);
    // message.data === 'hi'
});

Regarding self

The Window.self read-only property returns the window itself, as a WindowProxy. It can be used with dot notation on a window object (that is, window.self) or standalone (self). The advantage of the standalone notation is that a similar notation exists for non-window contexts, such as in Web Workers. By using self, you can refer to the global scope in a way that will work not only in a window context (self will resolve to window.self) but also in a worker context (self will then resolve to WorkerGlobalScope.self).

edited May 30 '20 at 12:51

answered May 30 '20 at 01:55

Marcos Casagrande

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Where comes the self variable? – Wong Jia Hau May 30 '20 at 06:25
1

From the worker, it's in the worker scope. You can see it in the link. – Marcos Casagrande May 30 '20 at 09:03
well it's a global object, in the browser you can do: `self === window`. In the worker `self` is the worker. – Marcos Casagrande May 30 '20 at 11:10
1

Thanks I found the reference here https://developer.mozilla.org/en-US/docs/Web/API/Window/self – Wong Jia Hau May 30 '20 at 12:46

How can a child worker send message to parent process in Deno?

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