Multithreaded JavaScript by Thomas Hunter II
Author:Thomas Hunter II
Language: eng
Format: epub
Publisher: O'Reilly Media
Published: 2021-09-22T00:00:00+00:00
timed-out
Another thread didnât call Atomics.notify() within the allotted timeout.
ok
Another thread did call Atomics.notify() in time.
You might be wondering why this method doesnât throw an error for the first two conditions and silently succeed instead of returning an ok. Because multithreaded programming is used for performance reasons, it stands to reason that calling these Atomics methods will be done in the hotpaths of an application, which are areas where the application spends the most time. Itâs less performant in JavaScript to instantiate Error objects and generate stack traces than to return a simple string, so the performance of this approach is pretty high. Another reason is that the not-equal case doesnât really represent an error case but that something youâre waiting for has already happened.
This blocking behavior might be a little shocking at first. Locking an entire thread sounds a bit intense, and in many cases it is. Another example of what can cause an entire JavaScript thread to lock is the alert() function in a browser. When that function is called, the browser displays a dialog and nothing at all can runânot even any background tasks using the event loopâuntil the dialog is dismissed. The Atomics.wait() method similarly freezes the thread.
This behavior is so extreme, in fact, that the âmainâ threadâthe default thread that is available when running JavaScript, outside of a web workerâis not allowed to call this method, at least in a browser. The reason is that locking the main thread would be such a poor user experience that the API authors didnât even want to allow it. If you do try to call this method in the main thread of a browser, you will get one of the following errors:
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