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Asked: 2026-06-11T20:53:09+00:00

I have two C++ applications: calc – computationally intensive, reads config from a file

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I have two C++ applications:

  1. calc – computationally intensive, reads config from a file

  2. ui – provides user friendliness. Transforms the choices the user makes in a UI into a config, launches calc and when calc finishes, displays the results.

I would like in ui to launch several instances of calc and wait for all of them to finish, then process the results of all. The question is, how can I wait for 8 simultaneously launched processes to finish? I googled around a bit but reached no conclusion. spanwl with P_NOWAIT seemed promising, but there seems to be no easy (“built-in”) way of seeing whether the process has already finished.

Any help is much appreciated,
Daniel

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1 Answer

  1. Editorial Team

    If you create the processes by calling CreateProcess, you will get back a process handle that you can wait on. To wait on multiple handles at once, use WaitForMultipleObjects function. This function has a limit – it can only wait for MAXIMUM_WAIT_OBJECTS (which was 64 for XP, not sure what it’s in Win7) handles at a time.

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