src/cache.h

   1 #ifndef INCLUDE_cache_h__
   2 #define INCLUDE_cache_h__
   3
   4 #include "git2/common.h"
   5 #include "git2/oid.h"
   6 #include "git2/odb.h"
   7
   8 #include "thread-utils.h"
   9
  10 #define GIT_DEFAULT_CACHE_SIZE 128
  11
  12 typedef void (*git_cached_obj_freeptr)(void *);
  13
  14 typedef struct {
  15         git_oid oid;
  16         git_atomic refcount;
  17 } git_cached_obj;
  18
  19 typedef struct {
  20         git_cached_obj *ptr;
  21         git_mutex lock;
  22         unsigned int lru;
  23 } cache_node;
  24
  25 typedef struct {
  26         cache_node *nodes;
  27
  28         unsigned int lru_count;
  29         size_t size_mask;
  30         git_cached_obj_freeptr free_obj;
  31 } git_cache;
  32
  33
  34 int git_cache_init(git_cache *cache, size_t size, git_cached_obj_freeptr free_ptr);
  35 void git_cache_free(git_cache *cache);
  36
  37 void *git_cache_try_store(git_cache *cache, void *entry);
  38 void *git_cache_get(git_cache *cache, const git_oid *oid);
  39
  40
  41 GIT_INLINE(int) git_cached_obj_compare(git_cached_obj *obj, const git_oid *oid)
  42 {
  43         return git_oid_cmp(&obj->oid, oid);
  44 }
  45
  46 GIT_INLINE(void) git_cached_obj_incref(git_cached_obj *obj)
  47 {
  48         git_atomic_inc(&obj->refcount);
  49 }
  50
  51 GIT_INLINE(void) git_cached_obj_decref(git_cached_obj *obj, git_cached_obj_freeptr free_obj)
  52 {
  53         if (git_atomic_dec(&obj->refcount) == 0)
  54                 free_obj(obj);
  55 }
  56
  57
  58
  59 #endif