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Re: [libmicrohttpd] Suspending/resuming not working with external select

From: Christian Grothoff
Subject: Re: [libmicrohttpd] Suspending/resuming not working with external select
Date: Sun, 4 Sep 2016 17:53:22 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Icedove/45.1.0

Dear Johannes,

You need to run "MHD_run()" between resuming and asking for the FD set.
It was not very well documented, so I've fixed the documentation in SVN

You also didn't FD_ZERO your fdsets, but that's minor.  I've attached
your code with my changes, so that it works.

Happy hacking!


On 09/04/2016 03:49 PM, Johannes Spangenberg wrote:
> Hello,
> I encountered some problems while using the libmicrohttpd. I was using 
> MHD_suspend_connection() and MHD_resume_connection() in combination with 
> an external event loop. The problem was that the connection was not 
> resumed until another request was made. I checked the event loop but 
> they was running and calling MHD_run_with_select() periodically. 
> Afterwards, I wrote a small test program, attached to this mail, to 
> check if it is a bug or misunderstanding of the library. I also tested 
> it agains the last version (0.9.51).
> Connections are still not resumed in the small test program. But in 
> difference to my original project, receiving another request does not 
> resume the first connection. The second request is never accepted by 
> libmicrohttpd. It seems that select() does not return to acceppt the 
> second connection after calling MHD_suspend_connection() on the first 
> one. If I'm not calling MHD_suspend_connection() and 
> MHD_resume_connection(), everythink works. Futuremore, if I am using 
> MHD_USE_SELECT_INTERNALLY and replace the external loop with a busy 
> loop, everything works as well. I thinks it looks like there is a bug in 
> MHD_suspend_connection() and MHD_resume_connection() when used with 
> external select. Could someone take a look and check whether I'm doing 
> something wrong or there is a bug in the library.
> I searchd for it but could not find a solution to fix it. A found 
> another conversation in the mailing list: [MHD_suspend_connection 
> API]( 
> It is not clear but thing it may be possible that he stumbled over the 
> same bug.
> My english is not the best but I hope you can understand everything.
> Johannes

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