George Slavin added the comment:
In case anyone else sees this thread, here's my trimmed down script to repro
the issue:
#!/usr/bin/env python2
import threading as mt
import signal
import time
import os
def sigusr2_handler(signum, frame):
raise RuntimeError('caught sigusr2')
signal.signal(signal.SIGUSR2, sigusr2_handler)
def sub(pid):
time.sleep(1)
os.kill(pid, signal.SIGUSR2)
try:
t = mt.Thread(target=sub, args=[os.getpid()])
t.start()
time.sleep(500)
except Exception as e:
print('except: %s' % e)
else:
print('unexcepted')
finally:
t.join()
When I run the above, I get the repro after hundreds of iterations. From these
results, it appears there is no guarentee that the signal handler will run
before the main thread continues execution at the time.sleep(500) line. This
would explain why we advance to the else clause before the exception is raised.
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<http://bugs.python.org/issue27889>
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