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  14.    <H1>[whatwg] WebSocket bufferedAmount includes overhead or not</H1>
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  16.     <B>Jonas Sicking</B> 
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  17.     <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"
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  18.        TITLE="[whatwg] WebSocket bufferedAmount includes overhead or not">jonas at sicking.cc
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  20.     <I>Wed Mar 31 15:57:57 PDT 2010</I>
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  36. <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:
    37. 

  37. &gt;<i> On 3/31/10 2:38 AM, Jonas Sicking wrote:
    38. 

  38. </I>&gt;&gt;<i>
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  39. </I>&gt;&gt;<i> I would have expected bufferedAmount to only change as a result of an
    40. 

  40. </I>&gt;&gt;<i> event being posted to the main event loop. We generally try to avoid
    41. 

  41. </I>&gt;&gt;<i> &quot;racy&quot; variables since people don't expect them. Consider for example
    42. 

  42. </I>&gt;&gt;<i>
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  43. </I>&gt;&gt;<i> if (ws.bufferedAmount&gt; &#160;X) {
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  44. </I>&gt;&gt;<i> &#160; setUpSomeState();
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  45. </I>&gt;&gt;<i> }
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  46. </I>&gt;&gt;<i>
    47. 

  47. </I>&gt;&gt;<i> try {
    48. 

  48. </I>&gt;&gt;<i> &#160; doOtherThings();
    49. 

  49. </I>&gt;&gt;<i> }
    50. 

  50. </I>&gt;&gt;<i> finally {
    51. 

  51. </I>&gt;&gt;<i> &#160; if (ws.bufferedAmount&gt; &#160;X) {
    52. 

  52. </I>&gt;&gt;<i> &#160; &#160; cleanUpState();
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  53. </I>&gt;&gt;<i> &#160; }
    54. 

  54. </I>&gt;&gt;<i> }
    55. 

  55. </I>&gt;&gt;<i>
    56. 

  56. </I>&gt;&gt;<i> I'd imagine most JS developers to expect the cleanup to always happen
    57. 

  57. </I>&gt;&gt;<i> if the setup did.
    58. 

  58. </I>&gt;<i>
    59. 

  59. </I>&gt;<i> Sure, but do they expect the cleanup to happen if the setup did not if
    60. 

  60. </I>&gt;<i> doOtherThings tried to send() stuff?
    61. 

  61. </I>&gt;<i>
    62. 

  62. </I>&gt;<i> More to the point, is send() allowed to actually send anything when called,
    63. 

  63. </I>&gt;<i> or does it have to buffer it all until the next time you get to the event
    64. 

  64. </I>&gt;<i> loop?
    65. 

  65. </I>
    66. 

  66. I would expect that send() is allowed to start streaming data over the
    67. 

  67. network as soon as it can, but only update bufferedAmount from the
    68. 

  68. event loop.
    69. 

  69. 

  70. / Jonas
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