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Asked: 2026-05-23T05:59:31+00:00

I have a java program where certain parts are computationally intensive. I wish to

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I have a java program where certain parts are computationally intensive.
I wish to make that part (which essentially generates an image according to some text data) in C/D.
(Multiple instances of the C program might be running at the same time).

Now, I want to be able to track the progress of the C/D program, so the java code
needs to read the status (progess, errors) of the C/D program somehow.

My idea is to use the environment variables in the OS, to store the status, “TIME_LEFT=2h10m42s” sort of.
Questions:

Is this a good idea, or is there something really bad about this design?
Are there some alternatives, (using sockets, stdin/stdout, other)?

EDIT: The Java works as a front-end, so the C/D code should NOT include anything specifically written for Java. The C/D code is essentially a stand-alone program, Java (or other) provides with GUI.

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1 Answer

  1. Editorial Team

    You cannot use environment variables for this, as you cannot communicate environment variables to another program by other than setting it before you start a new process. So you can’t run a C program that changes environment variables that your parent java program can see.

    Write line based status to stdout in your C (or D) program rather and read it in your java program.

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