why a cycle blocks the program?

[Mauro Venanzi <jjfnet libero it>]

hi 
sorry for this "newby question"

i have a program gtk tha do a while cycle
but starting the cycle the program hungs (stops)
and nothing i can do just ctrl +z

thank you



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Mauro Venanzi linux ru250233
hall2001 athlon-xp rm 135009 on Suse 8.1