[Qt-interest] Cleanly exit Qt app with <CTRL-C> from Linux console

[Markus Franke]

Hi Jorge,

qt-interest-bounces+franke.m=sebakmt.com at qt.nokia.com schrieb am 
23.12.2010 13:24:08:

> I think this is not related to signals but to objects being destroyed at 
main 
> exit. Are you creating some kind of blocking objects (sockets, database 
> connections)? do you have threads? if so is the message "... x threads 
didn't 
> exit" being printed?

Bingo! It had something to do with an open connection. I am using a serial 
port within my application. On <CTRL-C> the close() method is called on 
the /dev/ttyS* device. It turned out that this close() call took exactly 
30 seconds to finish. I tracked the problem down to some kernel code in 
<linux>/drivers/char/tty_ioctl.h:tty_wait_until_sent(). There a timeout of 
30 seconds has been declared.

Don't know why this happens but it turned out that as soon as I disable 
flow control by means of RTS/CTS the problem disappears.

Any comments on this?

Anyway, thanks for your help and wish you a merry christmas.

Markus


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