[Idle-dev] Breakpoint is not reached in multithreading application

Dima S spiridenok at tut.by
Thu Jan 8 15:38:09 CET 2009

Hi all,

I try to use IDLE for debugging my multithreading python application.
In my application i have the following class:

class DataMonitor( threading.Thread ):
     '''Updates data with regular frequency'''
     _update_frequency_in_sec = 0.5

     def __init__ ( self, update_funcs, data ):
         threading.Thread.__init__( self )
         self._update_funcs = update_funcs
         self._data = data
         self._keep_running = True

     def run(self):
         '''Start data monitoring'''
         while self._keep_running:
             print "i'm running"
             time.sleep( self._update_frequency_in_sec )

An object of this class is created from the main thread and is stored there.

When i set breakpoints in the code that is executed in the main thread, they 
are reached with no problems.
When i set breakpoints in the while loop of the run() method of my thread 
class DataMonitor (at the line with print statement), the breakpoint is 
never reached. However, the application keeps running and i get a lot of 
"i'm running" messages in the python shell of IDLE.

My configuration:
SunOS wsasd179 5.8 Generic_117350-18 sun4u sparc SUNW,Sun-Blade-1500
Python 2.5.1 (r251:54863, Aug  6 2008, 14:27:55)
[GCC 3.4.3] on sunos5

Thanks for any help on my problem!

Regards, DimaS
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