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A re-entrant program (or a thread-safe program, if you're more familiar with UNIX) is a program that doesn't change itself. I know what you're thinking: "how can a program change itself?" Well there are actually three parts to a computer program:

  • Program code - the instructions that are executed when a program runs.
  • Constants - constants used in a program. These are set when the program is written, and never change.
  • Storage area - or variables. This area changes as the program runs.
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11y ago

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