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worker: add ability to unshift message from MessagePort
In combination with Atomics, this makes it possible to implement generic synchronous functionality, e.g. `importScript()`, in Workers purely by communicating with other threads. This is a continuation of #26686, where a preference for a solution was voiced that allowed reading individual messages, rather than emitting all messages through events. PR-URL: #27294 Reviewed-By: Benjamin Gruenbaum <[email protected]> Reviewed-By: James M Snell <[email protected]> Reviewed-By: Gus Caplan <[email protected]> Reviewed-By: Ruben Bridgewater <[email protected]>
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Original file line number | Diff line number | Diff line change |
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'use strict'; | ||
const common = require('../common'); | ||
const assert = require('assert'); | ||
const { MessageChannel, receiveMessageOnPort } = require('worker_threads'); | ||
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const { port1, port2 } = new MessageChannel(); | ||
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const message1 = { hello: 'world' }; | ||
const message2 = { foo: 'bar' }; | ||
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// Make sure receiveMessageOnPort() works in a FIFO way, the same way it does | ||
// when we’re using events. | ||
assert.deepStrictEqual(receiveMessageOnPort(port2), undefined); | ||
port1.postMessage(message1); | ||
port1.postMessage(message2); | ||
assert.deepStrictEqual(receiveMessageOnPort(port2), { message: message1 }); | ||
assert.deepStrictEqual(receiveMessageOnPort(port2), { message: message2 }); | ||
assert.deepStrictEqual(receiveMessageOnPort(port2), undefined); | ||
assert.deepStrictEqual(receiveMessageOnPort(port2), undefined); | ||
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// Make sure message handlers aren’t called. | ||
port2.on('message', common.mustNotCall()); | ||
port1.postMessage(message1); | ||
assert.deepStrictEqual(receiveMessageOnPort(port2), { message: message1 }); | ||
port1.close(); |