| Re: Typing in a widget_text crashes my C program! [message #23753] |
Wed, 14 February 2001 08:25 |
davidf
Messages: 2866
Registered: September 1996
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Senior Member |
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Jason Weiss writes:
> Been using IDL (currently 5.4) for a while now, but I've come across a
> unexpected problem that has left me frustrated. We are using some
> C-code to drive some electronics through a PCI card on our Sun Ultra
> 10. During readout of our electronics, I noticed it would
> intermittently crash. After weeks of mysterious crashes, I discovered
> the program crashes when I type into a widget_text box!
I've heard through the usually reliable grapevine that
this is a discovered and documented bug in the Sun version
of IDL 5.4. But even though a number of people have spent
a lot of time looking at it, no one so far has been able
to pin-point the problem. It continues to be worked on.
The problem is made more difficult by the the use of
several different library routines from different vendors
in the affected code. The fact that the problem does not
appear in other UNIX versions suggests a problem in
a Sun library routine, but this is by no means
certain. RSI is working with Sun to identify and fix
the problem as soon as possible.
I'll let you know if I hear anything else.
Cheers,
David
David Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438 E-Mail: davidf@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155
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| Re: Typing in a widget_text crashes my C program! [message #23765 is a reply to message #23753] |
Mon, 12 February 2001 19:32  |
davidf
Messages: 2866
Registered: September 1996
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Senior Member |
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Jason Weiss (weiss@astro.ucla.edu) writes:
> Actually, I'm experiencing these problems with no event handling. I've been
> able to reproduce the crash with the following simple code:
>
> pro make_it_crash
>
> base=widget_base(/col)
> text=widget_text(base, /editable)
>
> widget_control, base, /realize
>
> end
>
> Thinking event handling could alleviate the problem, i added
>
> pro text_event, event
>
> end
>
> and
>
> xmanager, 'text', text, /just_reg, /no_block
>
> to my program, and it still crashed...
>
> without you guys knowing the particulars of the C-code or perhaps the PCI
> driver, I don't expect a solution. But info as to what IDL is doing when
> you type into a text box would be a good starting point for me...
Well, now I'm thinking the problem is LACK of
event handling. The JUST_REG keyword you set
on the XManager command is causing the program
to simply register itself. It is not generating
events, I don't think. But I guess there might
be some kind of communication going on between
the window manager and the XManager program.
Something like, "Hey, an event occurred."
"I know, but I'm not on the clock yet."
That kind of thing.
Try taking that JUST_REG keyword away, and see
if things work correctly with proper event passing.
I originally thought the text widget event was
getting into whatever event handler it was that
was calling your C program. But, of course, it's
all guess work without some code. :-)
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438 E-Mail: davidf@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155
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| Re: Typing in a widget_text crashes my C program! [message #23766 is a reply to message #23765] |
Mon, 12 February 2001 18:58 |
Jason Weiss
Messages: 2
Registered: February 2001
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Junior Member |
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Actually, I'm experiencing these problems with no event handling. I've been
able to reproduce the crash with the following simple code:
pro make_it_crash
base=widget_base(/col)
text=widget_text(base, /editable)
widget_control, base, /realize
end
Thinking event handling could alleviate the problem, i added
pro text_event, event
end
and
xmanager, 'text', text, /just_reg, /no_block
to my program, and it still crashed...
without you guys knowing the particulars of the C-code or perhaps the PCI
driver, I don't expect a solution. But info as to what IDL is doing when
you type into a text box would be a good starting point for me...
David Fanning wrote:
> Jason Weiss writes:
>
>> Been using IDL (currently 5.4) for a while now, but I've come across a
>> unexpected problem that has left me frustrated. We are using some
>> C-code to drive some electronics through a PCI card on our Sun Ultra
>> 10. During readout of our electronics, I noticed it would
>> intermittently crash. After weeks of mysterious crashes, I discovered
>> the program crashes when I type into a widget_text box!
>>
>> Any ideas why? What happens, on a system level, when a user types into
>> a widget_text? What would cause this (or any) kind of interaction
>> between IDL and C?
>
> Poorly written or misunderstood event handling?
> Just guessing. :-)
>
> Cheers,
>
> David
>
> --
> David Fanning, Ph.D.
> Fanning Software Consulting
> Phone: 970-221-0438 E-Mail: davidf@dfanning.com
> Coyote's Guide to IDL Programming: http://www.dfanning.com/
> Toll-Free IDL Book Orders: 1-888-461-0155
--
[//]=[//]=[//]=[//]=[//]=[//]=[//]=[//]=[//]=[//]=[//]=[//]
"Pull against the tide, and you pull against the gradient,
Woven with era, we belong to the ages."
-- Trash Can Sinatras, "Orange Fell"
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| Re: Typing in a widget_text crashes my C program! [message #23767 is a reply to message #23766] |
Tue, 13 February 2001 06:37 |
davidf
Messages: 2866
Registered: September 1996
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Senior Member |
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Jason Weiss writes:
> Been using IDL (currently 5.4) for a while now, but I've come across a
> unexpected problem that has left me frustrated. We are using some
> C-code to drive some electronics through a PCI card on our Sun Ultra
> 10. During readout of our electronics, I noticed it would
> intermittently crash. After weeks of mysterious crashes, I discovered
> the program crashes when I type into a widget_text box!
>
> Any ideas why? What happens, on a system level, when a user types into
> a widget_text? What would cause this (or any) kind of interaction
> between IDL and C?
Poorly written or misunderstood event handling?
Just guessing. :-)
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438 E-Mail: davidf@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155
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