lnenov <lne...@mm-sol.com> writes: > My application hangs on exit. > I have isoleted this piece of code that reproduces the error: (the > time module is extra and not needed to reproduce) > > import threading > import time > > def func(): > b = threading.Semaphore(value=0) > b.acquire()
This waits for the semaphore to have a positive value. This thread is blocked (apparently forever, since no other thread has access to the semaphore). > a = threading.Thread(target=func) > a.start() > > time.sleep(2) > quit() > > When SystemExit is raised, nothing happens. Python hangs. Your blocked thread is still around, still waiting for the semaphore. Your program won't exit while there are non-daemon threads alive. -- Alain. -- http://mail.python.org/mailman/listinfo/python-list
