git.oblomov.eu Git - git/blob - commit-slab-decl.h

   1 #ifndef COMMIT_SLAB_HDR_H
   2 #define COMMIT_SLAB_HDR_H
   3
   4 /* allocate ~512kB at once, allowing for malloc overhead */
   5 #ifndef COMMIT_SLAB_SIZE
   6 #define COMMIT_SLAB_SIZE (512*1024-32)
   7 #endif
   8
   9 #define declare_commit_slab(slabname, elemtype)                         \
  10                                                                         \
  11 struct slabname {                                                       \
  12         unsigned slab_size;                                             \
  13         unsigned stride;                                                \
  14         unsigned slab_count;                                            \
  15         elemtype **slab;                                                \
  16 }
  17
  18 /*
  19  * Statically initialize a commit slab named "var". Note that this
  20  * evaluates "stride" multiple times! Example:
  21  *
  22  *   struct indegree indegrees = COMMIT_SLAB_INIT(1, indegrees);
  23  *
  24  */
  25 #define COMMIT_SLAB_INIT(stride, var) { \
  26         COMMIT_SLAB_SIZE / sizeof(**((var).slab)) / (stride), \
  27         (stride), 0, NULL \
  28 }
  29
  30 #endif /* COMMIT_SLAB_HDR_H */