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Re: [libmicrohttpd] Aync handling & message response

From: Kunal Ekawde
Subject: Re: [libmicrohttpd] Aync handling & message response
Date: Wed, 29 Aug 2018 12:14:31 +0530

I was able to do following but have some issue in MHD_queue_response.
Scenario: Main thread having select, without any MHD threads with curl multi integration.(updated benchmark.c)
1. Receive GET,  on 2nd call of ahc_echo, saved the connection pointer and invoked curl client to GET to another server.
2. On rsp from second server & curl_multi_perform success, data is copied and saved in association to connection in #1.
3. Just after #2, when curl_multi_info_read is successful , MHD_queue_response is invoked, but it returns 0 and the easy_handle state is 1.

Can we send the response to client only from the MHD callback handler ? or something is missing in above ?
Any help will be appreciated.


On Mon, Aug 27, 2018 at 2:45 PM Kunal Ekawde <address@hidden> wrote:

With ref to: , I gone through twister, but looks like this is sync operation. The curl operation is performed sync in same thread. I wanted to know if there is a way to make it async, so basically on receiving the data callback (entire data), we should be able to store the connection details (cls ?) so that server can do some other task, like may be fetch from DB. When server is ready with response, it should be able to call MHD_queue_response with the stored connection details. When it breaks to fetch from DB, it could also handle other incoming requests. 
Let me know If I'm missing something here or if there is any pointers w.r.t use of MHD in this way preferably using raw epoll instead of GNUnet.

Threading model interested is : Application is single threaded with its own epoll, MHD not to create any threads.



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