[Stackless] Debugging stackless applications

[Andrew Francis]

Hello Rotem:

Darn, I have to stop getting digests...

>for instance:
>
>def g(some_param):
>     if some_param % 2 == 0:
>           raise Exception()

I don't quite understand why you are importing pdb in
the exception. You are also catching your exception in
the wrong place. Finally I believe if main exits, then
there will be one tasklet running and Stackless will
terminate. I re-wrote the code.

#!/usr/bin/env python
import stackless
import pdb

def g(some_param):
    if some_param % 2 == 0:
       #pdb.set_trace()
       print "=>", some_param
       raise Exception()

def f(some_param, name):
    print name,"starting"
    stackless.schedule()
    g(some_param)
    stackless.schedule()
    print name, "finished"

task1 = stackless.tasklet(f)(1, "task1")
task2 = stackless.tasklet(f)(2, "task2")

try:
    stackless.run()
except Exception:
    print "An exception was thrown"
    # make sure, main thread doesn't exit just yet
    while stackless.getruncount() > 1:
        stackless.schedule()
    
and I get:

task1 starting
task2 starting
=> 2
An exception was thrown
task1 finished

If you uncomment the pdb.set_trace, you can step
through task2. I guess this approach is better than
nothing.

Cheers,
Andrew
    



       
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