Xotcl October 2007

xotcl@alice.wu.ac.at

3 participants
3 discussions

XOTcl1.5.6 and Tcl8.5b1
by Murr, Florian 29 Oct '07

29 Oct '07

Dear XOTcl-guys! I tried to upgrade from Tcl8.4+XOTcl1.5.3 (all my projects worked fine here!) to Tcl8.5b1, but my projects won't run due to some XOTcl problems. The following snippet is extracted from my project and I tested it with XOTcl1.5.5 (from WinTclTk) and XOTcl1.5.6 from ActiveState-Teacup. But both failed with the same error message. My guess: Non-positional Arguments don't work! # ************************************************************************ ***** # The script: Class X X instproc ListOfStringsOption {{-default {}} {-cb {}} name} { if {$cb eq {}} { set cb "::set ::$name " } ;# global variable eval $cb \$default } ::X create x1 ::x1 ListOfStringsOption uu # ************************************************************************ ***** # Error message: can't read "default": no such variable while executing "::set ::uu $default" ("eval" body line 1) invoked from within "eval $cb \$default" (procedure "ListOfStringsOption" line 5) ::x1 ::X->ListOfStringsOption invoked from within "::x1 ListOfStringsOption uu"

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XOTcl 1.5.6 Available
by Gustaf Neumann 12 Oct '07

12 Oct '07

Dear XOTcl Community, XOTcl 1.5.6 is available. This version is mostly a fix release for some problems that were apparently quite long in the code and could cause crashes for threaded applications. best regards -gustaf neumann Announcing XOTcl 1.5.6 ************************* We are pleased to announce the availability of XOTcl 1.5.6. Major changes relative to 1.5.4 are: * Fixes for treating global volatile objects (many thanks to Zoran for his concise reports). The problem was that XOTcl uses C-level var traces containing pointers to objects. If for some reason, these objects are destroyed earlier, this results in dangling references. This problem caused especially problems in the automatic cleanup of variables at the end of a thread. * Fix for Tcl 8.4.* for situations, where Tcl variables contained references to deleted XOTcl objects. The problem was introduced by the VarReform changes between 1.5.3 and 1.5.4 by a bad side effect of a Tcl_Obj based command to look up Tcl command structurs. The problem did not exist for xotcl compiled against Tcl 8.5 and is as well fixed on the Tcl side in CVS (might become available, when one more Tcl 8.4 release is eventually released) * Serializer: - Added dependency rule in serializer to ensure slots of super-classes are listed before subclasses. (Thanks to Stefan Sobernig for reporting the problem) - Moved deactivation of traces into "Serializer all" to get simpler results on "o serialize". * Extended regression tests For more details about the changes, please consult the ChangeLog and documentation. MORE INFO General and more detailed information about XOTcl and its components can be found at http://www.xotcl.org

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serializer bug: searchDefaults
by Stefan Sobernig 03 Oct '07

03 Oct '07

I just stumbled over buggy behaviour of the XOTcl Serializer with respect to inheritance relationships and searchDefaults, originally encountered under AOLServer. % info patchlevel 8.4.14 % set ::xotcl::version 1.5 % set ::xotcl::patchlevel .4 I could also re-produce this behaviour with the most recent xotcl release, 1.5.5 (as there were no changes to the serializer between 1.5.4 and 1.5.5, I assume) The snippet attached can be used to reproduce this behaviour in a non-AOLServer environment. Interesting enough, the critical part is to create an instance of the super class BEFORE declaring the sub class. Commenting the line "Super create super" yields a sound stream, creating super yields a broken one. To reproduce, do the following: tclsh searchDefaults.xotcl tclsh /tmp/stream I tried to have a more thorough look but I couldn't illuminate myself ... //stefan -- Stefan Sobernig Institute of Information Systems and New Media Vienna University of Economics Augasse 2-6 A - 1090 Vienna `- +43 - 1 - 31336 - 4878 [phone] `- +43 - 1 - 31336 - 746 [fax] `- stefan.sobernig(a)wu-wien.ac.at <mailto:stefan.sobernig@wu-wien.ac.at> `- ss(a)thinkersfoot.net <mailto:ss@thinkersfoot.net> package req XOTcl package req xotcl::serializer namespace import ::xotcl::* Class Super -slots { Attribute attribute -default "some_default_value" } # !!! critical !!! Super create super # !!!!!!!!!!!!!!!! Class Sub -superclass Super Sub create sub -attribute "some_new_value" set stream [::Serializer all] set f [open /tmp/stream w] puts $f { package req XOTcl } puts $f $stream catch {close $f}

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Xotcl October 2007