cache.h 1.19 KB
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/*
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 * Copyright (C) the libgit2 contributors. All rights reserved.
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 *
 * This file is part of libgit2, distributed under the GNU GPL v2 with
 * a Linking Exception. For full terms see the included COPYING file.
 */
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#ifndef INCLUDE_cache_h__
#define INCLUDE_cache_h__

#include "git2/common.h"
#include "git2/oid.h"
#include "git2/odb.h"

#include "thread-utils.h"

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#define GIT_DEFAULT_CACHE_SIZE 128

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typedef void (*git_cached_obj_freeptr)(void *);

typedef struct {
	git_oid oid;
	git_atomic refcount;
} git_cached_obj;

typedef struct {
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	git_cached_obj **nodes;
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	git_mutex lock;

	unsigned int lru_count;
	size_t size_mask;
	git_cached_obj_freeptr free_obj;
} git_cache;

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int git_cache_init(git_cache *cache, size_t size, git_cached_obj_freeptr free_ptr);
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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);

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GIT_INLINE(void) git_cached_obj_incref(void *_obj)
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{
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	git_cached_obj *obj = _obj;
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	git_atomic_inc(&obj->refcount);
}

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GIT_INLINE(void) git_cached_obj_decref(void *_obj, git_cached_obj_freeptr free_obj)
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{
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	git_cached_obj *obj = _obj;

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	if (git_atomic_dec(&obj->refcount) == 0)
		free_obj(obj);
}

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#endif