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Give a more detailed but simple example of how execution proceeds, espec... #32

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Give a more detailed but simple example of how execution proceeds, espec... #32

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Give a more detailed but simple example of how execution proceeds, es…
brettz9 Aug 20, 2013
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Update nonblocking-cooperation.html
brettz9 Aug 20, 2013
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44 changes: 44 additions & 0 deletions examples/nonblocking-cooperation.html
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<html>
<head><title>task.js examples: non-blocking cooperation</title></head>
<script type="application/javascript" src="../lib/task.js"></script>
<script type="application/javascript;version=1.8">
function go() {
var { spawn, sleep } = task;

var out = document.getElementById("out");

spawn(function() {
out.innerHTML += "2 Brett: I'm starting first.\n";
yield sleep(2500);
out.innerHTML += "5 Brett: You started second but\n\tstill beat me! Wow!\n";
});
// Code after the above spawn() will start executing
// immediately (even before the above spawn's callback begins), so this
// text 1 will be the first to be output.
out.innerHTML += '1 THE RACE\n';

// Code now continues on, where we can add another spawn call to
// cooperate/interleave with the first. Its contents will not yet
// execute
spawn(function() {
out.innerHTML += "3 Usain Bolt: I'm starting second.\n";
yield sleep(500);
out.innerHTML += "4 Usain Bolt: I win!\n";
});

// Now that this script block is finished, the first spawn callback can begin.
// It will add text 2 then stop on its 2500ms sleep yield, giving a chance for the
// second spawn callback to begin. The second spawn callback begins, adding text 3, and it then
// stops on its 500ms sleep yield. Since the other spawn callback is still busy with the 2500ms sleep,
// (and since there is no other code such as in any other spawns waiting to
// execute), the script will do nothing until the 500ms are up and then text 4 will be added.
// Since the 2500ms is still going on at this point and there is no other code waiting, the
// script will do nothing until the 2500ms are finished at which point execution can continue to let
// text 5 finally be added.
}
</script>
<body onload="go()">
<pre style="border: solid 1px black; width: 300px; height: 200px;" id="out">
</pre>
</body>
</html>