src/cache.h

   1 /*
   2  * Copyright (C) 2009-2011 the libgit2 contributors
   3  *
   4  * This file is part of libgit2, distributed under the GNU GPL v2 with
   5  * a Linking Exception. For full terms see the included COPYING file.
   6  */
   7 #ifndef INCLUDE_cache_h__
   8 #define INCLUDE_cache_h__
   9
  10 #include "git2/common.h"
  11 #include "git2/oid.h"
  12 #include "git2/odb.h"
  13
  14 #include "thread-utils.h"
  15
  16 #define GIT_DEFAULT_CACHE_SIZE 128
  17
  18 typedef void (*git_cached_obj_freeptr)(void *);
  19
  20 typedef struct {
  21         git_oid oid;
  22         git_atomic refcount;
  23 } git_cached_obj;
  24
  25 typedef struct {
  26         git_cached_obj *ptr;
  27         git_mutex lock;
  28 } cache_node;
  29
  30 typedef struct {
  31         cache_node *nodes;
  32
  33         unsigned int lru_count;
  34         size_t size_mask;
  35         git_cached_obj_freeptr free_obj;
  36 } git_cache;
  37
  38
  39 int git_cache_init(git_cache *cache, size_t size, git_cached_obj_freeptr free_ptr);
  40 void git_cache_free(git_cache *cache);
  41
  42 void *git_cache_try_store(git_cache *cache, void *entry);
  43 void *git_cache_get(git_cache *cache, const git_oid *oid);
  44
  45
  46 GIT_INLINE(int) git_cached_obj_compare(git_cached_obj *obj, const git_oid *oid)
  47 {
  48         return git_oid_cmp(&obj->oid, oid);
  49 }
  50
  51 GIT_INLINE(void) git_cached_obj_incref(git_cached_obj *obj)
  52 {
  53         git_atomic_inc(&obj->refcount);
  54 }
  55
  56 GIT_INLINE(void) git_cached_obj_decref(git_cached_obj *obj, git_cached_obj_freeptr free_obj)
  57 {
  58         if (git_atomic_dec(&obj->refcount) == 0)
  59                 free_obj(obj);
  60 }
  61
  62
  63
  64 #endif