[Octave-bug-tracker] [bug #55254] clear all crashes when variable from oct file class is displayed in workspace

[John W. Eaton]

Update of bug #55254 (project octave):

                  Status:               Confirmed => Patch Submitted        

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Follow-up Comment #7:

I'm not sure why the behavior changed with the changeset mentioned in comment
#5, but this seems to be a problem with unloading shared libraries that define
new octave_value types.  This can happen because "clear all" also clears
functions and when all functions that are defined in a shared library (.oct
file) are cleared, Octave unloads the shared library.  Then if an existing
variable of that type is used, some kind of memory error is highly likely.

I'm attaching a temporary fix (mlock all functions that create values of the
types that are defined in the .oct file).

Longer term, it would be better to maintain a mapping of dynamically defined
data types with the .oct file that defines them and also record the number of
values of each dynamically defined data type that exist.  Then we could only
unload shared libraries that dynamically define data types when the number of
those values is zero.  Maybe for Octave 6.  For now, I think it is best to go
with the mlock solution.

(file #45986)
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Additional Item Attachment:

File name: audio-mlock-diffs.txt          Size:27 KB


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