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   <H1>[whatwg] WebSocket bufferedAmount includes overhead or not</H1>
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    <B>Jonas Sicking</B> 
    <A HREF="mailto:whatwg%40lists.whatwg.org?Subject=Re%3A%20%5Bwhatwg%5D%20WebSocket%20bufferedAmount%20includes%20overhead%20or%20not&In-Reply-To=%3Ck2i63df84f1003311557of6e198fesd792b509b8eec285%40mail.gmail.com%3E"
       TITLE="[whatwg] WebSocket bufferedAmount includes overhead or not">jonas at sicking.cc
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    <I>Wed Mar 31 15:57:57 PDT 2010</I>
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<PRE>On Wed, Mar 31, 2010 at 3:16 PM, Boris Zbarsky &lt;<A HREF="http://lists.whatwg.org/listinfo.cgi/whatwg-whatwg.org">bzbarsky at mit.edu</A>&gt; wrote:
&gt;<i> On 3/31/10 2:38 AM, Jonas Sicking wrote:
</I>&gt;&gt;<i>
</I>&gt;&gt;<i> I would have expected bufferedAmount to only change as a result of an
</I>&gt;&gt;<i> event being posted to the main event loop. We generally try to avoid
</I>&gt;&gt;<i> &quot;racy&quot; variables since people don't expect them. Consider for example
</I>&gt;&gt;<i>
</I>&gt;&gt;<i> if (ws.bufferedAmount&gt; &#160;X) {
</I>&gt;&gt;<i> &#160; setUpSomeState();
</I>&gt;&gt;<i> }
</I>&gt;&gt;<i>
</I>&gt;&gt;<i> try {
</I>&gt;&gt;<i> &#160; doOtherThings();
</I>&gt;&gt;<i> }
</I>&gt;&gt;<i> finally {
</I>&gt;&gt;<i> &#160; if (ws.bufferedAmount&gt; &#160;X) {
</I>&gt;&gt;<i> &#160; &#160; cleanUpState();
</I>&gt;&gt;<i> &#160; }
</I>&gt;&gt;<i> }
</I>&gt;&gt;<i>
</I>&gt;&gt;<i> I'd imagine most JS developers to expect the cleanup to always happen
</I>&gt;&gt;<i> if the setup did.
</I>&gt;<i>
</I>&gt;<i> Sure, but do they expect the cleanup to happen if the setup did not if
</I>&gt;<i> doOtherThings tried to send() stuff?
</I>&gt;<i>
</I>&gt;<i> More to the point, is send() allowed to actually send anything when called,
</I>&gt;<i> or does it have to buffer it all until the next time you get to the event
</I>&gt;<i> loop?
</I>
I would expect that send() is allowed to start streaming data over the
network as soon as it can, but only update bufferedAmount from the
event loop.

/ Jonas

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