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dom/workers/test/recursion_worker.js@925c144e1f1f (annotated)

dom/workers/test/recursion_worker.js

Fri, 16 Jan 2015 18:13:44 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Fri, 16 Jan 2015 18:13:44 +0100

branch

TOR_BUG_9701

changeset 14

925c144e1f1f

permissions

-rw-r--r--

Integrate suggestion from review to improve consistency with existing code.

michael@0	1	/**
michael@0	2	* Any copyright is dedicated to the Public Domain.
michael@0	3	* http://creativecommons.org/publicdomain/zero/1.0/
michael@0	4	*/
michael@0	5
michael@0	6	// This function should never run on a too much recursion error.
michael@0	7	onerror = function(event) {
michael@0	8	postMessage(event.message);
michael@0	9	};
michael@0	10
michael@0	11	// Pure JS recursion
michael@0	12	function recurse() {
michael@0	13	recurse();
michael@0	14	}
michael@0	15
michael@0	16	// JS -> C++ -> JS -> C++ recursion
michael@0	17	function recurse2() {
michael@0	18	var xhr = new XMLHttpRequest();
michael@0	19	xhr.onreadystatechange = function() {
michael@0	20	xhr.open("GET", "nonexistent.file");
michael@0	21	}
michael@0	22	xhr.open("GET", "nonexistent.file");
michael@0	23	}
michael@0	24
michael@0	25	var messageCount = 0;
michael@0	26	onmessage = function(event) {
michael@0	27	switch (++messageCount) {
michael@0	28	case 2:
michael@0	29	recurse2();
michael@0	30
michael@0	31	// An exception thrown from an event handler like xhr.onreadystatechange
michael@0	32	// should not leave an exception pending in the code that generated the
michael@0	33	// event.
michael@0	34	postMessage("Done");
michael@0	35	return;
michael@0	36
michael@0	37	case 1:
michael@0	38	recurse();
michael@0	39	throw "Exception should have prevented us from getting here!";
michael@0	40
michael@0	41	default:
michael@0	42	throw "Weird number of messages: " + messageCount;
michael@0	43	}
michael@0	44
michael@0	45	throw "Impossible to get here!";
michael@0	46	}