[GRASS-git] [OSGeo/grass] e45231: r.mapcalc: fix too many open maps (#6561)

[Anna Petrasova]

  Branch: refs/heads/main
  Home:   https://github.com/OSGeo/grass
  Commit: e452310fbaf951c27e9de87fcd8b4fa86705f7cf
      https://github.com/OSGeo/grass/commit/e452310fbaf951c27e9de87fcd8b4fa86705f7cf
  Author: Anna Petrasova <kratochanna at gmail.com>
  Date:   2025-10-30 (Thu, 30 Oct 2025)

  Changed paths:
    M raster/r.mapcalc/evaluate.c
    M raster/r.mapcalc/map.c
    M raster/r.mapcalc/map3.c
    M raster/r.mapcalc/mapcalc.h

  Log Message:
  -----------
  r.mapcalc:  fix too many open maps (#6561)

This mostly reverts changes to map.c done during the parallelization, putting back the optimizations in cache and opening maps. Now map is opened once per expression and thread (e.g. " test = elevation + elevation" nprocs=3 results in opening map elevation 3x, not 6x). All cache access happens within the thread with its specific buffers and file descriptor.



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