[Tcl-bugs] [ tktoolkit-Bugs-220916 ] Tk commands callable before Tk_Init bombs accessing Tcl stub table

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Bugs item #220916, was opened at 2000-10-31 17:31
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Category: 61. Tk_Win Functions
Group: = 8.3.1
Status: Open
Resolution: None
Priority: 5
Submitted By: Brent B. Welch (welch)
Assigned to: Don Porter (dgp)
Summary: Tk commands callable before Tk_Init bombs accessing Tcl stub table

Initial Comment:
OriginalBugID: 5494 Bug
Version: 8.3.1
SubmitDate: '2000-05-15'
LastModified: '2000-05-15'
Severity: SER
Status: UnAssn
Submitter: techsupp
ChangedBy: hobbs
RelatedBugIDs: 2269
OS: All Windows


Name:
Per Mildner

ReproducibleScript:
There are Tk_ routines that can reasonably be called before Tk_Init (and thus Tcl_InitStubs) is called. In particular Tk_GetNumMainWindows (should return zero) and Tk_MainWindow (explicitly documented as callable on non-Tk interpreters), perhaps there are more.

When Tk is built using TCL stubs (always the case on Windows) these routines will crash while trying to access Tcl_GetThreadData trough the (NULL) Tcl stub table.

The patch for Bug DB ticket#2269 solves this problem in another context and could be adapted. (explicitly check for tclStubsPtr==NULL)





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>Comment By: Don Porter (dgp)
Date: 2001-12-28 11:40

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Looking this over, I think the submitter is correct.
There are some Tk_* routines that one may want/need
to call before calling Tk_Init on any interp.  Those
routines should work (or at least return a sensible
error message instead of crashing) before Tcl stubs
have been initialized.

Most Tk_* routines -- that operate on an interp assumed
to have Tk loaded in it -- do not need this capability.

This issue should only arise when one writes his own
"big wish" application, and does not make use of Tk_Main().

A possible workaround would be for someone needing this
to build a copy of Tk without -DUSE_TCL_STUBS.  Only
folks coding in C need this, and they have the ability
to build their own Tk libraries from source in such a way
that they don't need it anymore.

Next step would be to compose a list of the Tk_* routines
needing this improvement.

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Comment By: Jeffrey Hobbs (hobbs)
Date: 2001-12-27 16:47

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While it notes that Tk_MainWindow can be called on non-Tk 
interpreters, it doesn't explicitly say it can be called 
before Tk has been initialized.  In fact, I don't seem to 
see that for any function.  If you look at bug #219996, 
which is the source of the above mentioned (with patch in 
#220542), the cause is harder to avoid because the Tk dll 
just has to exist and it blows on dll unload.  Referring 
this to dgp as he was working on this before, and can 
comment on the validity here.

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