[Numpy-discussion] Handling interrupts in NumPy extensions

Travis Oliphant oliphant at ee.byu.edu
Thu Aug 24 19:11:09 CDT 2006


David M. Cooke wrote:

>On Aug 24, 2006, at 18:38 , Travis Oliphant wrote:
>
>  
>
>>You can already use the approach suggested:
>>
>>if (PyOS_InterruptOccurred()) goto error
>>
>>to handle interrupts.  The drawback of this approach is that the loop
>>executes more slowly because a check for the interrupt occurs many  
>>times
>>in the loop which costs time.
>>
>>The advantage is that it may work with threads (I'm not clear on  
>>whether
>>or not PyOS_InterruptOccurred can be called without the GIL, though).
>>    
>>
>
>It should be; it's pure C code:
>
>int
>PyOS_InterruptOccurred(void)
>{
>         if (!interrupted)
>                 return 0;
>         interrupted = 0;
>         return 1;
>}
>  
>

I tried to test this with threads using the following program and it 
doesn't seem to respond to interrupts. 


import threading
import numpy.core.multiarray as ncm
class mythread(threading.Thread):
    def run(self):
        print "Starting thread", self.getName()
        ncm.test_interrupt(1)
        print "Ending thread", self.getName()

m1 = mythread()
m2 = mythread()
m1.start()
m2.start()







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