[Libwebsockets] How to send data asynchronously to the client?
lws14 at mordent.com
Fri Jun 20 14:18:39 CEST 2014
/>>/ 1)Is there a way to asynchronously send the data to the client? That is,
/>>/ without being in a callback, server spontaneously initiating data
/>>/ transfer to the client..!!
>Libwebsockets is basically single-threaded. But, with care from another
>server thread, you can call either
>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.
I am doing exactly this, but it doesn't work.
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
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?
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