I'm using the PyObjC bridge. I have a computation that will be
triggered by a user. It takes about 2 minutes depending on the
database we're using. I'd like the user to be able to kill it if he
decides it's taking too long.
It seems like threading should be the solution. My simple demo
based on what I read in NSThread related docs is as follows. (I've
put the NSAutoreleasePool call in twice here, but tried it in either
place, separately).
from Foundation import *
from AppKit import *
import objc, time
from PyObjCTools import NibClassBuilder
class PyThreadAppDelegate(NibClassBuilder.AutoBaseClass):
def init(self):
self = super(PyThreadAppDelegate, self).init()
return self
def go_(self, sender):
print 'go_'
pool = NSAutoreleasePool.alloc().init()
NSThread.detachNewThreadSelector_toTarget_withObject_(
'newThread:', Threaded, None)
del pool
def kill_(self, sender):
pass
class Threaded(NSObject):
@objc.signature('v:@')
def newThread_(obj):
print 'Threaded'
pool = NSAutoreleasePool.alloc().init()
for i in range(5):
time.sleep(1)
print i
del pool
This dies with:
===== Monday, June 4, 2007 8:53:09 PM US/Eastern =====
go_
2007-06-04 20:53:11.414 PyThread[555] *** _NSAutoreleaseNoPool():
Object 0x1419cc0 of class NSCFString autoreleased with no pool in
place - just leaking
2007-06-04 20:53:11.415 PyThread[555] *** +[Threaded newThread:]:
selector not recognized
2007-06-04 20:53:11.415 PyThread[555] *** _NSAutoreleaseNoPool():
Object 0x146cb10 of class NSCFString autoreleased with no pool in
place - just leaking
2007-06-04 20:53:11.415 PyThread[555] *** _NSAutoreleaseNoPool():
Object 0x146c9a0 of class NSCFString autoreleased with no pool in
place - just leaking
2007-06-04 20:53:11.415 PyThread[555] *** _NSAutoreleaseNoPool():
Object 0x146c980 of class NSException autoreleased with no pool in
place - just leaking
2007-06-04 20:53:11.415 PyThread[555] An uncaught exception was raised
2007-06-04 20:53:11.415 PyThread[555] *** +[Threaded newThread:]:
selector not recognized
2007-06-04 20:53:11.415 PyThread[555] *** Uncaught exception:
<NSInvalidArgumentException> *** +[Threaded newThread:]: selector not
recognized
Jun 4 20:53:12 joan-olsons-computer-2 crashdump[556]: PyThread crashed
Jun 4 20:53:12 joan-olsons-computer-2 crashdump[556]: crash report
written to: /Users/jolson/Library/Logs/CrashReporter/PyThread.crash.log
In addition, I don't know how to talk to the thread to kill it.
Thanks for any help,
Tom Elliott
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