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Unable to clear mex file

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Jim Hokanson
Jim Hokanson on 16 Feb 2017
Commented: Jim Hokanson on 15 Sep 2017
I'm compiling a mex file and then moving it up a directory so that it is in the Matlab path. The movefile command fails with the error message: "The process cannot access the file because it is being used by another process."
The mex file is located in a package, so before calling the movefile command, I call:
clear('my_package.myMexFunction')
However, the mex code is relatively simple, with the only memory allocation being for the output:
plhs[0] = mxCreateLogicalMatrix(1,1);
mxLogical *pl = mxGetLogicals(plhs[0]);
I don't free anything in the mex file.
Running 'clear all' fixes the problem and lets me move the file. Is there an alternative?

  2 Comments

Walter Roberson
Walter Roberson on 21 Feb 2017
Is it possible that there is a lingering handle to the function in an object that belongs to the package?
Jim Hokanson
Jim Hokanson on 15 Apr 2017
Unfortunately I got distracted with other things and now I can't find the test case that I was using :/

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Accepted Answer

James Tursa
James Tursa on 21 Feb 2017
I hadn't seen that TMW post about memory leaks and clearing mex routines. Not sure what the issue is there and what the other "process" is.
What is the actual name of your mex function file? Can you clear that name directly? E.g.,
% some code here to call a mex routine named "mymex.mexw32"
[M X] = inmem
% results for X list mymex
clear mymex
[M X] = inmem
% results for X no longer list mymex (i.e., it has been cleared)

  1 Comment

Jim Hokanson
Jim Hokanson on 15 Sep 2017
I finally got back to writing some of this code and encountered this problem again (although apparently a different file since this one was not in a package). Clearing the mex file worked great. Strangely I only encountered this problem on Windows, not on Mac (although versions may be different).

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