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[libmicrohttpd] 答复:The resuming of a single connection and daemon not co

From: 钱在晨(二败)
Subject: [libmicrohttpd] 答复:The resuming of a single connection and daemon not coordinate
Date: Sun, 31 May 2015 14:37:41 +0800


I think I find the reason. 

In the function MHD_resume_connection(), daemon.c: line 1601


It requires the MHD_USE_THREAD_PER_CONNECTION option to lock the cleanup_connection_mutex, but int my program, I use the options like 


May I ask why only  MHD_USE_THREAD_PER_CONNECTION requires the lock? I want to use the threadpool but it seems risky to use MHD_resume_connection and MHD_suspend_connection.

Look forwards to your reply. 

Best Regards,



发件人:钱在晨(二败) <address@hidden>

发送时间:2015年5月31日(星期日) 10:57

收件人:libmicrohttpd <address@hidden>

主 题:The resuming of a single connection and daemon not coordinate


Is there any situation that in the function resume_suspended_connections(), connection->resuming and connection->suspended are MHD_YES,  but daemon->resuming is MHD_NO?

My program uses one thread to produce data and a callback function in another thread (in the threadpool of libmicrohttpd) to return the produced data. The producing-data thread need wait until new data's coming. So I use  MHD_suspend_connection in the callback function if no data to send and  MHD_resume_connection in the producing-data thread when data is ready. But the program does not work because in the end in the function  resume_suspended_connections(), the daemon->resuming is MHD_NO. In the meanwhile, there is actually a suspended connection in the daemon->suspended_connections_head. I check the status and find that the suspended connection with resuming: MHD_YES and suspended: MHD_YES, but the daemon->resuming is MHD_NO. 

I don't know if I explain the issue clearly. Is it normal or abnormal that daemon->resuming with the value MHD_NO makes a previously suspended connection cannot be resumed?

Best Regards,


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