Re: [libmicrohttpd] MHD_suspend_connection and MHD_resume_connection with MHD_USE_POLL

[Denis Dowling]

Hi Luke,

It seems to work but I still need to test more thoroughly. What I do is in the 
access handler callback, for requests that should be handled by a long poll I 
call MHD_suspend_connection(), then do MHD_create_response_from_callback() and 
return. When my application is ready to actually respond to the poll it calls 
MHD_resume_connection() on the connection. The event loop then wakes up and 
calls the callback registered with MHD_create_response_from_callback where I 
fill in the response on the first call and then return 
MHD_CONTENT_READER_END_OF_STREAM on the next call.

It took me a large amount of messing around to figure this all out. If you want 
I can throw together a small example that implements this.

Regards,
Denis


-----Original Message-----
From: address@hidden [mailto:address@hidden On Behalf Of Luke Dashjr
Sent: Thursday, 9 April 2015 6:48 PM
To: libmicrohttpd development and user mailinglist
Subject: Re: [libmicrohttpd] MHD_suspend_connection and MHD_resume_connection 
with MHD_USE_POLL

On Thursday, April 09, 2015 5:28:51 AM Denis Dowling wrote:
> Hi all,
>
> I was trying to use MHD_suspend_connection() and
> MHD_resume_connection() to implement long polling on a request. I am
> using options MHD_USE_SELECT_INTERNALLY and MHD_USE_POLL options. I
> noticed the server thread went to 100% CPU after the first 
> MHD_resume_connection() call.
> Looking at the code in MHD_poll_all() I can see that the file
> descriptor from daemon->wpipe[0] gets inserted into the list of file
> descriptors to poll but this file descriptor is never read so every
> time this function is called it returns immediately. The code works
> fine if I drop to using just MHD_USE_SELECT_INTERNALLY.
>
> The patch below fixes the problem.

Does it work besides that? I was never able to get it to work at all...

Luke

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