commit-slab-decl.h

   1 #ifndef COMMIT_SLAB_DECL_H
   2 #define COMMIT_SLAB_DECL_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 #define declare_commit_slab_prototypes(slabname, elemtype)              \
  31                                                                         \
  32 void init_ ##slabname## _with_stride(struct slabname *s, unsigned stride); \
  33 void init_ ##slabname(struct slabname *s);                              \
  34 void clear_ ##slabname(struct slabname *s);                             \
  35 void deep_clear_ ##slabname(struct slabname *s, void (*free_fn)(elemtype *ptr)); \
  36 elemtype *slabname## _at_peek(struct slabname *s, const struct commit *c, int add_if_missing); \
  37 elemtype *slabname## _at(struct slabname *s, const struct commit *c);   \
  38 elemtype *slabname## _peek(struct slabname *s, const struct commit *c)
  39
  40 #define define_shared_commit_slab(slabname, elemtype) \
  41         declare_commit_slab(slabname, elemtype); \
  42         declare_commit_slab_prototypes(slabname, elemtype)
  43
  44 #endif /* COMMIT_SLAB_DECL_H */