I am running code in a loop and certain function might take
long or short time. I don't want to wait long and
want to continue with the fast cases.
Up to sage 5.12 I used:
alarm(5)
try:
F=mightbelong(n)
alarm(0) #to not fire later
except KeyboardInterrupt: #alarm
alarm(0)
continue
#alarm free code
On 5.13 alarm(0) fails.
If I do
alarm(0.1);fa=factor(2)
I get KeyboardInterrupt which breaks later code
though the critical stuff passed.
How to cancel a pending alarm()?
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