[Twisted-Python] Exit all threads upon KeyboardInterrupt
Dustin J. Mitchell
dustin at v.igoro.us
Tue Jan 14 07:27:23 MST 2014
There are two things wrong with your scenario.
First, in any production or production-ready environment, your
software needs to correctly handle stuck TCP connections. With the
proliferation of "smart" network equipment (session-tracking
firewalls, etc.), this is much more common than it was five or ten
years ago. Some DBAPI backends are better about this than others -
for example, MySQL-Python gets it right, but PyMySQL does not.
Second, this has nothing whatsoever to do with whether the I/O is
blocking or not. Twisted apps can and, believe me from experience, do
suffer from stuck TCP connections. Sure, the wasted resources in this
case are smaller (just a file descriptor, not a thread), but the user
experience is the same (part of the application hangs irreversibly).
In fact, this is about the only thing the manhole is used for at
Mozilla: running `os.close` on stuck fd's.
Dustin
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