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Usage

from twisted_hang import HangWatcher
watcher = HangWatcher(0.1, 0.5) # these params are optional. They have sane defaults
watcher.start()

Stuff will magically get printed out if the main thread hangs for more than MAX_DELAY seconds. If you want more info, add something like this after the lines above:

from twisted.internet import task
# Print stats every 60 seconds
lc = task.LoopingCall(watcher.print_stats)
lc.start(60)