[Interest] QTcpServer stop accepting connections

[Benjamin Zeller]

Ok i just found out what the problem is.
Its a "feature" of chrome and firefox, they only open
a few connections to a server and reuse them later.

Means even if i send 20 requests the browser will
split them into bunches of 6.....

What a waste of time ....

Thanks for your help.

On 05.09.2013 14:27, Benjamin Zeller wrote:
> On 05.09.2013 14:09, Etienne Sandré-Chardonnal wrote:
>> Hi,
>>
>> Did you see this in the doc?:
>> *Note:*The returnedQTcpSocketobject cannot be used from another thread.
>> If you want to use an incoming connection from another thread, you need
>> to overrideincomingConnection().
>
> In fact we did override incomingConnection().
> Creating the QTcpSocket manually. But maybe QTcpSockets can not be
> moved between threads?
>
> This is a opensource project so:
>
>
> incoming connection are not queued:
> https://github.com/bzeller/tufao/blob/master/src/priv/tcpserverwrapper.cpp#L28
>
> socket is created here (without a parent):
> https://github.com/bzeller/tufao/blob/master/src/httpserver.cpp#L81
> https://github.com/bzeller/tufao/blob/master/src/httpserver.cpp#L100
>
> pushed to the thread:
> https://github.com/bzeller/tufao/blob/master/src/priv/workerthread.cpp#L56
>
>
> I know moving the socket descriptor would be better but the design of
> the library does not really fit that approach.
>
>
>>
>> (From Qt 4.8.1)
>>
>>
>> 2013/9/5 Benjamin Zeller <zeller.benjamin at web.de
>> <mailto:zeller.benjamin at web.de>>
>>
>>      Hello again,
>>
>>      ok after digging some more its clear that the E_AGAIN or E_WOULDBLOCK
>>      error means that there are no connections available to open. That makes
>>      no sense because i opened 20 connections in a row, but only the
>>      first 6 are handled and then the following 6 and so on.
>>
>>      What could possibly delay the notification of new incoming connecions
>>      until another one is handled?
>>
>>      On 05.09.2013 13:04, Benjamin Zeller wrote:
>>       > Hello,
>>       >
>>       > not sure if i just ran into a bug or if i do something wrong:
>>       >
>>       > Basically i have a QTcpServer accepting connections, after a
>>      connection
>>       > comes in a QTcpSocket is created and pushed to a workerthread to
>>      handle
>>       > it (moveToThread).
>>       >
>>       > But after 6 connections the QTcpServer stops accepting connections
>>       > (seems to be releated to receiving a EAGAIN error) until the first 6
>>       > are served (but i openend 20 connections at once from my testcode).
>>       >
>>       > Then it continues with the next 6 and i'm pretty sure the mainloop is
>>       > not blocked, because when i pause with the debugger its always
>>      waiting
>>       > inside exec().
>>       >
>>       > This happens on Linux, i did not test yet with other operating
>>      systems.
>>       >
>>       > Anyone ran into something similar?
>>       >
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