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test,worker: add more tests for worker.ref()/.unref() #26083

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test,worker: add more tests for worker.ref()/.unref() #26083

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test,worker: add more tests for worker.ref()/.unref()
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@addaleax
addaleax committed Feb 13, 2019
commit c341d8864f47317cca4c550230f2e512bc88b07a
10 changes: 10 additions & 0 deletions test/parallel/test-worker-ref-onexit.js
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'use strict';
const common = require('../common');
const { Worker } = require('worker_threads');

// Check that worker.unref() makes the 'exit' event not be emitted, if it is
// the only thing we would otherwise be waiting for.

const w = new Worker('', { eval: true });
w.unref();
w.on('exit', common.mustNotCall());
29 changes: 29 additions & 0 deletions test/parallel/test-worker-ref.js
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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 { Worker } = require('worker_threads');

// Test that calling worker.unref() leads to 'beforeExit' being emitted, and
// that we can resurrect the worker using worker.ref() from there.

const w = new Worker(`
const { parentPort } = require('worker_threads');
parentPort.once('message', (msg) => {
parentPort.postMessage(msg);
});
`, { eval: true });

process.once('beforeExit', common.mustCall(() => {
console.log('beforeExit');
w.ref();
w.postMessage({ hello: 'world' });
}));

w.once('message', common.mustCall((msg) => {
console.log('message', msg);
}));

w.on('exit', common.mustCall(() => {
console.log('exit');
}));

w.unref();