#ifndef COMMIT_SLAB_H
#define COMMIT_SLAB_H
#ifndef COMMIT_SLAB_SIZE
#define COMMIT_SLAB_SIZE (512*1024-32)
#endif
#define define_commit_slab(slabname, elemtype) \
\
struct slabname { \
unsigned slab_size; \
unsigned stride; \
unsigned slab_count; \
elemtype **slab; \
}; \
static int stat_ ##slabname## realloc; \
\
static void init_ ##slabname## _with_stride(struct slabname *s, \
unsigned stride) \
{ \
unsigned int elem_size; \
if (!stride) \
stride = 1; \
s->stride = stride; \
elem_size = sizeof(elemtype) * stride; \
s->slab_size = COMMIT_SLAB_SIZE / elem_size; \
s->slab_count = 0; \
s->slab = NULL; \
} \
\
static void init_ ##slabname(struct slabname *s) \
{ \
init_ ##slabname## _with_stride(s, 1); \
} \
\
static void clear_ ##slabname(struct slabname *s) \
{ \
int i; \
for (i = 0; i < s->slab_count; i++) \
free(s->slab[i]); \
s->slab_count = 0; \
free(s->slab); \
s->slab = NULL; \
} \
\
static elemtype *slabname## _at(struct slabname *s, \
const struct commit *c) \
{ \
int nth_slab, nth_slot; \
\
nth_slab = c->index / s->slab_size; \
nth_slot = c->index % s->slab_size; \
\
if (s->slab_count <= nth_slab) { \
int i; \
s->slab = xrealloc(s->slab, \
(nth_slab + 1) * sizeof(s->slab)); \
stat_ ##slabname## realloc++; \
for (i = s->slab_count; i <= nth_slab; i++) \
s->slab[i] = NULL; \
s->slab_count = nth_slab + 1; \
} \
if (!s->slab[nth_slab]) \
s->slab[nth_slab] = xcalloc(s->slab_size, \
sizeof(**s->slab) * s->stride); \
return &s->slab[nth_slab][nth_slot * s->stride]; \
} \
\
static int stat_ ##slabname## realloc
#endif