David M. Cotter, 26.07.2013 08:15:
> in my app i initialize python on the main thread, then immediately call
> PyEval_SaveThread() because i do no further python stuff on the main thread.
>
> then, for each script i want to run, i use boost::threads to create a new
> thread, then on that thread i "ensure" the GIL, do my stuff, then release it.
>
> so, to test concurrency, on my first background thread, i do an infinite loop
> that just logs "i'm alive", then calls sleep(0.25)
>
> so that thread continues to run forever (with it's GIL ensured)
>
> according to the doc: "In order to emulate concurrency of execution, the
> interpreter regularly tries to switch threads"
>
> so i figure i can run another thread that does a single print statement:
>
>> ensure gil
>> print my thing
>> release gil
>
> and this DOES run. however, after releasing it's gil, i guess the interpeter
> gets back to the first back thread, but then has this error immediately:
>
> 9: Traceback (most recent call last):
> 9: File "<string>", line 70, in ?
> 9: File "<string>", line 55, in main
> 9: AttributeError: 'builtin_function_or_method' object has no attribute
> 'sleep'
>
> suddenly the sleep module has been unloaded?? huh? i thought the thread
> state had been preserved?
You didn't show your code, but as a wild guess, maybe you did
from time import time
instead of
import time
somewhere? If not, please provide the exact example code that you are running.
Stefan
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