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    Unfortunately, that call doesn't seem to exist in the version I'm
    using.  What version is the latest stable version?<br>
    <br>
    Thanks!<br>
    -m<br>
    <br>
    <div class="moz-cite-prefix">On 06/20/2014 08:29 AM, Bas Appelo
      wrote:<br>
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      thread-1:<br>
          libwebsocket_service(context, LARGE_NUMBER); //blocks<br>
      <br>
      thread-2:<br>
          libwebsocket_cancel_service(context); // wakes up thread-1<br>
      <br>
      thread-1:<br>
          libwebsocket_callback_on_writable(context, wsi);<br>
          libwebsocket_service(context, LARGE_NUMBER); //blocks <=
      will call the callback!<br>
      <br>
      Now you will receive a callback, it works like a charm.<br>
      So to write data you'll need to be in a callback, but the way
      above shows you how to get there/enforce one.<br>
      <br>
      <br>
      <div class="moz-cite-prefix">On 06/20/2014 02:18 PM, Mike M wrote:<br>
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      <blockquote cite="mid:53A4269F.7030108@mordent.com" type="cite">
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        <pre>>><i> Hi,
</i>>><i>
</i>>><i> 1)Is there a way to asynchronously send the data to the client? That is,
</i>>><i> without being in a callback, server spontaneously initiating data
</i>>><i> transfer to the client..!!
</i>>
>Libwebsockets is basically single-threaded.  But, with care from another 
>server thread, you can call either
>
>libwebsocket_callback_on_writable(), or
>libwebsocket_callback_on_writable_all_protocol()
>
>but you need to manage your own list of live wsi / connections with the 
>first option (by tracking their creating and destruction in the 
>ESTABLISHED and CLOSED callbacks).
>
>You will get a LWS_CALLBACK_SERVER_WRITABLE as soon as it's possible to 
>write on that connection then, and you should figure out what to write 
>and write it from there.
>
>-Andy


</pre>
        <small>Hi,<br>
          <br>
          I am doing exactly this, but it doesn't work.<br>
          <br>
          I have a thread that calls libwebsocket_service with a huge
          timeout.  Writes, etc, are only ever done from within the
          callback.  When I need to write something from another thread,
          I queue up the message that needs to be written and then
          immediately call
          libwebsocket_callback_on_writeable_all_protocol on the proto
          I'm writing for.<br>
          <br>
          Unfortunately, I never get LWS_CALLBACK_SERVER_WRITEABLE until
          the libwebsocket_service times out and gets called again. 
          This is totally broken.  I saw a trac issue (#56) about using
          ppoll.  Unfortunately, the version of the library we're using
          doesn't seem to have that code in it.  Any ideas?<br>
          <br>
          Thanks,<br>
          -m<br>
          <br>
        </small> <br>
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</pre>
      </blockquote>
      <br>
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