When does Web Worket postMessage({}) return to caller

From	Richard Maher <maher_rjSPAMLESS@hotmail.com>
Newsgroups	comp.lang.javascript
Subject	When does Web Worket postMessage({}) return to caller
Date	2015-03-19 10:30 +0800
Organization	Aioe.org NNTP Server
Message-ID	<medcc1$58h$1@speranza.aioe.org> (permalink)

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I have a recollection of reading that a postMessage request will not 
return until the onmessage event has been delivered to the recipient.

Having said that, I can't seem to find any reference on the web at the 
mo and docs such as: -
https://html.spec.whatwg.org/multipage/workers.html
talk of message "queues" which make me think that messages can be 
stacked/queued up for processing.

Does someone here have a reference pointer for the prescribed behaviour?

Can a web-page and worker get into a deadlock by simply trying to send 
messages to each other at the same time?

NB: As always can the regular personality disorders go "follow" 
themselves somewhere else?

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When does Web Worket postMessage({}) return to caller Richard Maher <maher_rjSPAMLESS@hotmail.com> - 2015-03-19 10:30 +0800

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