26 lines
1.2 KiB
JavaScript
26 lines
1.2 KiB
JavaScript
// When MessagePort.onmessage is set to a value that is not a function, the
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// setter should call .unref() and .stop(), clearing a previous onmessage
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// listener from holding the event loop open. This test confirms that
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// functionality.
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'use strict';
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const common = require('../common');
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const { Worker, parentPort } = require('worker_threads');
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// Do not use isMainThread so that this test itself can be run inside a Worker.
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if (!process.env.HAS_STARTED_WORKER) {
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process.env.HAS_STARTED_WORKER = 1;
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const w = new Worker(__filename);
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w.postMessage(2);
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} else {
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// .onmessage uses a setter. Set .onmessage to a function that ultimately
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// should not be called. This will call .ref() and .start() which will keep
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// the event loop open (and prevent this from exiting) if the subsequent
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// assignment of a value to .onmessage doesn't call .unref() and .stop().
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parentPort.onmessage = common.mustNotCall();
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// Setting `onmessage` to a value that is not a function should clear the
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// previous value and also should allow the event loop to exit. (In other
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// words, this test should exit rather than run indefinitely.)
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parentPort.onmessage = 'fhqwhgads';
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}
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