On Feb 16, 2006, at 11:45 AM, Gustavo Sverzut Barbieri wrote:
> > On 2/16/06, Mike Orr <[EMAIL PROTECTED]> wrote: >> >> On 2/16/06, Kevin Dangoor <[EMAIL PROTECTED]> wrote: >>> >>> On 2/15/06, Mike Orr <[EMAIL PROTECTED]> wrote: >>>> Then I discovered if the server is not handling a request, pressing >>>> ctrl-C quits all the threads. But if it is handling a request, the >>>> threads remain. If I then press Stop in the browser, the threads >>>> still remain, and I have to kill them. Whereas if I kill the >>>> threads >>>> with extreme prejudice, the browser suddenly times out. >>>> >>>> I'd expected the threads to just halt when I press ctrl-C and the >>>> browser to time out immediately. But I haven't used a >>>> multithreaded >>>> framework for a while so I'm not sure this is possible. Still, the >>>> main thread can tell the others to hurry up and exit, no? >>> >>> You can use a global variable that tells the other threads to exit >>> when they get around to it. I don't know of a way for the "main >>> thread" to "kill" the other threads. >> >> That's one thing I never understood. Java does it, but Python claims >> it's impossible. > > Linux have pthread_kill(), but maybe it's too dependent on platform > and Python doesn't support it. > > Java, AFAIR, does its own thread implementation.... but I may be > wrong. > > I'm also looking for a solution in this area :-( You're out of luck, there is not and never will be a solution to this "problem". It's simply not possible to safely kill a thread in Python without the consent of that thread, because it's not designed in a way that makes that a safe operation. Java was designed with that constraint, but I'm sure that even Java fails to do this if the runaway thread is stuck in native code. Using pthread_kill would be very bad -- imagine that the killed thread was holding the GIL at the time. Assuming the platform supported that function: you'd kill the thread, but you'd also deadlock Python because every other thread would wait forever on the GIL. IOTW, If you want killable execution contexts that don't require instrumentation, you must use processes. You have no other option. -bob --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "TurboGears" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/turbogears -~----------~----~----~----~------~----~------~--~---
