[Twisted-Python] Problem: spawnProcess() never ending when installSignalHandlers=False
James Y Knight
foom at fuhm.net
Sat Jun 11 11:40:11 EDT 2005
On Jun 11, 2005, at 11:08 AM, Matt Feifarek wrote:
> So this behavior is by design? Again, it DID work before; for the last
> year or so, I've been using this code in production on a few servers.
> Perhaps a note could be made in the docs that ProcessProtocol doesn't
> work in this case.
There is one. It logs "spawnProcess called, but the SIGCHLD handler
is not installed. This probably means you have not yet called
reactor.run, or called reactor.run(installSignalHandler=0). You will
probably never see this process finish, and it may become a zombie
process." However, your example doesn't have logging setup, so you
don't see that message.
> This will make it pretty hard to integrate into other worlds. I'm not
> sure that I can over-ride the signal handling in Webware and register
> handlers. Other bits of python libraries might be the same way.
> I look forward to any "more general solution" that anyone can come
> up with!
If you cannot override the signal handling, do something like:
from twisted.internet import task
That's less efficient but will work. I have a vague recollection that
in old versions twisted used to do this by default but I might just
be making that up.
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