[Python-Dev] Re: asyncore 2.1.1/2.2 incompatibility (original) (raw)

Carl J. Nobile Carl J.Nobile cnobile1@twcny.rr.com
Fri, 22 Mar 2002 21:56:09 -0500 (EST)

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Hi all,

I've created two exceptions that will be raised when either a SIGTERM or SIGHUP is caught. This seems to have solved the problem as the slightly modified version of my test server, that I've attached, demonstrates. This is a much more elegant solution to the problem, but I'm still not so sure that the poll functions should be ignoring EINTR in the way that they do. I wonder how much code this has broken?

At a minimum something should be said about how this works and how to handle signals in the asyncore documentation.

Thanks for all your help.

Carl

On 22-Mar-2002 Andrew Kuchling wrote:

On Fri, Mar 22, 2002 at 01:05:28PM -0500, Guido van Rossum wrote:

program to re-read its configuration file. This works in 2.2.1 ^^^^^ I presume you mean 2.1.1? From the CVS log it looks like this has 2.1.1 is correct; typo on my part. I think if Carl (who submitted 528295) had created a signal handler that raised an exception (rather than simply return), that would probably have had the desired effect -- but I'm not 100% sure. If it works, it has the added advantage of working with earlier versions of Python too. I'd like to hear if this workaround works. Carl? Trying it, it looks like it does, and a quick glance at ceval.c agrees. The docs for libsignal don't mention anything about what happens when you raise an exception in a signal handler, though, and perhaps they should. To sum up, it looks like this isn't a bug, and the test program should be raising a RereadConfiguration exception instead of relying on details of asyncore's loop. That also means asyncore doesn't need a way to be told to exit its loop, since raising an exception does the job nicely and Pythonically. --amk (www.amk.ca) One has no wish to be devoured by alien monstrosities, even in the cause of political progress. -- One of the Tribunal, in "Carnival of Monsters"

E-Mail: Carl J. Nobile <cnobile1@twcny.rr.com> Home E-Mail: Carl J. Nobile <cnobile@AppliedTheory.com> Work Date: 22-Mar-2002 Time: 21:45:55

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