Nala Ginrut <nalagin...@gmail.com> skribis:

> And there're two possible applications:
> 1. handle the requests in a server
> 2. read files from disk (but how big file is proper for par-map)

Quoting the fine manual:

  Note that futures are intended for the evaluation of purely
  functional expressions.  Expressions that have side-effects or rely on
  I/O may require additional care, such as explicit synchronization (*note
  Mutexes and Condition Variables::).

IOW, think twice before you use it for something not purely computational.
:-)

Ludo’.

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