Trace Analysis Patterns (Part 62)

This pattern is called Opposition Messages (borrowed from binary opposition originated in Saussure’s structuralism). It covers the following pairs of messages usually found in software traces and logs such as:

  • open / close
  • create / destroy
  • allocate / free (deallocate)
  • call / return
  • enter / exit (leave)
  • load / unload
  • save / load
  • lock / unlock
  • map / unmap

The absence of an opposite may point to some problems such as synchronization and leaks or Incomplete History (wait chains). There can always be a possibility that a second term is missing due to Sparse Trace but this is a poor implementation choice that leads to confusion during troubleshooting and debugging.

- Dmitry Vostokov @ + -

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