parallel.h

   1 /*
   2  * Parallel processing
   3  */
   4
   5 #ifndef PARALLEL_H
   6 #define PARALLEL_H
   7
   8 #ifdef NPROCESSORS
   9 # define NSECTIONS NPROCESSORS
  10 #else
  11 # define NSECTIONS 1
  12 #endif
  13
  14 /* used anamorphically: section, nsections */
  15
  16 #define OUTER_PERSECTION_BASE(zero,n, sect) \
  17   ((zero) + sect * (((n)-(zero) + NSECTIONS-1) / NSECTIONS))
  18 #define OUTER(v,zero,n, precomp)                                          \
  19   for ((v)= OUTER_PERSECTION_BASE((zero),(n), section);                   \
  20        precomp,                                                           \
  21        (v) < OUTER_PERSECTION_BASE((zero),(n), section + 1) && (v) < (n); \
  22        (v)++)
  23
  24 #define nsections NSECTIONS
  25
  26 typedef void Computation(const struct Vertices *vertices,
  27                          int section, void *secdata, void *gendata);
  28
  29 void inparallel(const struct Vertices *vertices,
  30                 Computation *separately,
  31                 Computation *combine,
  32                 size_t secdatasz, void *gendata);
  33
  34 #endif /*PARALLEL_H*/