Archives May 19, 2005
Neat debugging trick from James Knight (Finding out what's hanging in your Twisted application...)
Written by
on
in
Snaking.
In response to my queries about how to catch a hanging application, James posted this wonderful little snippet of code:
import signal, pdb, sys
from twisted.internet import task
def timeout(*args):
sys.stderr.write("SIGALRM timeout, breaking into debugger.\n")
import pdb; pdb.set_trace()
signal.signal(signal.SIGALRM, timeout)
task.LoopingCall(signal.alarm, 10).start(1)
The reason that works is that the alarm call cancels all previous alarm ...
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Mike C. Fletcher, the VRPlumber, is a philosopher of design turned computer programmer based in Toronto, Canada. He works primarily in the Python programming language, and maintains a large number of Open Source software packages. You can reach him at: mcfletch@vrplumber.com.