Xotcl August 2006

xotcl@alice.wu.ac.at

5 participants
4 discussions

Precedence Order
by Scott Gargash 07 Sep '06

07 Sep '06

As I understand it, precedence order is computed as filters then mixins the superclasses, and this sort order is applied "globally" to an object. In other words: Class create Base Class create Derived -superclass Base Derived d d info precedence ==> ::Derived ::Base ::xotcl::Object Class create BaseMixin Base instmixin add BaseMixin d info precedence ==> ::BaseMixin ::Derived ::Base ::xotcl::Object This behavior seems to violate encapsulation. BaseMixin is intended to intercept messages to Base. Derived doesn't know about BaseMixin and BaseMixin doesn't know about Derived, yet BaseMixin ends up being the first interceptor of messages to Derived. Since BaseMixin is intended to modify the behavior of Base, it would be better BaseMixin preceeded Base (and only Base) in the sort order. d info precedence ==> ::Derived ::BaseMixin ::Base ::xotcl::Object The current behavior means you can't really add a mixin without understanding everywhere that the object being extended is used. Is there some benefit to the current behavior that I don't understand?

3 6

Training in Xotcl
by Aslam Mohammed (masam) 29 Aug '06

29 Aug '06

Friends, We are looking for some expert in XOTCL to come and train, does your org does training if yes can u pls do contact @ 919-392-8267 Tx Aslam

1 0

setExitHandler & threads
by Scott Gargash 17 Aug '06

17 Aug '06

I've run into an interaction with threads and the XOTcl exit handler that I don't understand. I create a thread from within an object, and release that thread in the object's destructor. If I destroy the object directly, everything's fine, but if I destroy the object through "Object setExitHandler", I get an error. Am I treading into undefined behavior? Is there well-defined way to shut down multiple threads? Scott Here's some sample code: package require XOTcl package require Thread namespace import {xotcl::*} Class A A instproc init {} { my set tid [thread::create [subst -nocommands { set ::auto_path [list $::auto_path] package require XOTcl namespace import {xotcl::*} Object b thread::wait }]] } A instproc destroy {args} { thread::send [my set tid] {b destroy} thread::release [my set tid] next } A a if {0} { # This gives an error xotcl::Object setExitHandler {a destroy} } else { # this works a destroy } exit

2 4

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by Roxanne 04 Aug '06

04 Aug '06

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Xotcl August 2006