thodg/libgit2/src/cache.h

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• Hash : e4b4da14
  Author :
  Date : 2012-01-27T18:28:02
  

  cache: Simplify locking mechanics The object cache is mostly IO-bound, so it makes no sense to have a lock per node.

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• src/cache.h

• /*
   * Copyright (C) 2009-2011 the libgit2 contributors
   *
   * This file is part of libgit2, distributed under the GNU GPL v2 with
   * a Linking Exception. For full terms see the included COPYING file.
   */
  #ifndef INCLUDE_cache_h__
  #define INCLUDE_cache_h__
  
  #include "git2/common.h"
  #include "git2/oid.h"
  #include "git2/odb.h"
  
  #include "thread-utils.h"
  
  #define GIT_DEFAULT_CACHE_SIZE 128
  
  typedef void (*git_cached_obj_freeptr)(void *);
  
  typedef struct {
  	git_oid oid;
  	git_atomic refcount;
  } git_cached_obj;
  
  typedef struct {
  	git_cached_obj **nodes;
  	git_mutex lock;
  
  	unsigned int lru_count;
  	size_t size_mask;
  	git_cached_obj_freeptr free_obj;
  } git_cache;
  
  int git_cache_init(git_cache *cache, size_t size, git_cached_obj_freeptr free_ptr);
  void git_cache_free(git_cache *cache);
  
  void *git_cache_try_store(git_cache *cache, void *entry);
  void *git_cache_get(git_cache *cache, const git_oid *oid);
  
  GIT_INLINE(void) git_cached_obj_incref(void *_obj)
  {
  	git_cached_obj *obj = _obj;
  	git_atomic_inc(&obj->refcount);
  }
  
  GIT_INLINE(void) git_cached_obj_decref(void *_obj, git_cached_obj_freeptr free_obj)
  {
  	git_cached_obj *obj = _obj;
  
  	if (git_atomic_dec(&obj->refcount) == 0)
  		free_obj(obj);
  }
  
  #endif
  

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