High CPU usage when using getch ()

[R.Dakshinamurthi]

Hi All,
Our application is developed in C/Sybase and running under Tru64 5.1a.

Our screens are developed using Unix Curses.

There is a call to getch () with in do ... while loop.
If there is no user input for approximately about 2hrs, the process started taking more than 90% of CPU.
What could be the corrective action?
Is it possible to set timeout? Please note that the mode set is cbreak.

The speedy response will be highly appreciated.

Thank you,
Dakshin

[John Daley]

Dakshin,

You'd need more information.

I would grab dcpi from here:
http://h30097.www3.hp.com/dcpi/

...and use it to keep an eye on the application. There are docs on that site.

You could also try connecting to the process with ladebug's -pid option, doing ^C and t.

truss and trace also have the ability to attach to a running process.

[Ralf Puchner]

First doublecheck your program maybe the cbreak mode is not active consuming cpu usage.
Insert a sleep() in front of the getch() command.

Try kdbx -k /vmunix /dev/mem
(kdbx) set $PID=
(kdbx) tstack

so have a look onto the stack. may it gives you a clue what is going on.