[Tutor] Questions about threads

[A]

Hi,
Can anybody please answer my questions?

1. In my application  I need one function to run in threads. The 
number of threads is chosen by user and numbers of threads can 
not be higher at one time. 
This function writes to a file also.How can I prevent other threads 
from writting to this file when the file is open by another thread ?

2. How can one process control another? For example: my 
program tries to connect to a server over phone.  I want  to cancel 
dial up connection if there is timeout. How can that be done in 
Python?

Thank you very much for help.
Ladislav


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