[Tcl-bugs] [ tcl-Bugs-2944777 ] Tcl_WaitForEvent: CFRunLoop finished on MacOSX

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Bugs item #2944777, was opened at 2010-02-02 12:29
Message generated for change (Comment added) made by starseeker
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Category: None
Group: development: 8.6b1.1
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Cliff Yapp (starseeker)
Assigned to: Nobody/Anonymous (nobody)
Summary: Tcl_WaitForEvent: CFRunLoop finished on MacOSX

Initial Comment:
Using tcl 8.6cvs compiled for X11 graphics on Mac OSX, I have been attempting to get an application working whose purpose is to incrementally display an image onscreen as it is generated by a raytracer.  To do this, the general approach is:

1.  Set up the window and Tk Photo
2.  Enter a loop where the image generation routine calls a function to put blocks into the photo (this is in C)
     The loop:
     a.  Calls Tk_PhotoPutBlock to write the generated information
     b.  Calls Tcl_DoOneEvent(TCL_ALL_EVENTS|TCL_DONT_WAIT); to immediately update the view.

It's the latter step that seems to be failing: the window appears, but there is no visible output and the error on the command line is:

Tcl_WaitForEvent: CFRunLoop finished
Abort trap

If I comment out the Tcl_DoOneEvent line, the display eventually does show the image but only upon completion of the entire raytrace.  This same code did succeed with Tcl/Tk 8.5 X11 on the Mac, although the 8.5 AquaTk results were similar to the above - it either didn't update until the end or produced the same error as seen above.

If any additional information or example code is needed I will do my best to supply it.  Any help appreciated.


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>Comment By: Cliff Yapp (starseeker)
Date: 2010-02-02 14:17

Message:
One important update I just found - the above behavior is observed only
when raytracing using multiple cores, which may indicate that the issue is
thread related - is Tcl_DoOneEvent supposed to be thread safe?

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