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/* Copyright (c) 2007-2013, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/**
* \file mempool.h
* \brief Headers for mempool.c
**/
#ifndef TOR_MEMPOOL_H
#define TOR_MEMPOOL_H
/** A memory pool is a context in which a large number of fixed-sized
* objects can be allocated efficiently. See mempool.c for implementation
* details. */
typedef struct mp_pool_t mp_pool_t;
void *mp_pool_get(mp_pool_t *pool);
void mp_pool_release(void *item);
mp_pool_t *mp_pool_new(size_t item_size, size_t chunk_capacity);
void mp_pool_clean(mp_pool_t *pool, int n_to_keep, int keep_recently_used);
void mp_pool_destroy(mp_pool_t *pool);
void mp_pool_assert_ok(mp_pool_t *pool);
void mp_pool_log_status(mp_pool_t *pool, int severity);
#define MP_POOL_ITEM_OVERHEAD (sizeof(void*))
#define MEMPOOL_STATS
#ifdef MEMPOOL_PRIVATE
/* These declarations are only used by mempool.c and test.c */
struct mp_pool_t {
/** Doubly-linked list of chunks in which no items have been allocated.
* The front of the list is the most recently emptied chunk. */
struct mp_chunk_t *empty_chunks;
/** Doubly-linked list of chunks in which some items have been allocated,
* but which are not yet full. The front of the list is the chunk that has
* most recently been modified. */
struct mp_chunk_t *used_chunks;
/** Doubly-linked list of chunks in which no more items can be allocated.
* The front of the list is the chunk that has most recently become full. */
struct mp_chunk_t *full_chunks;
/** Length of <b>empty_chunks</b>. */
int n_empty_chunks;
/** Lowest value of <b>empty_chunks</b> since last call to
* mp_pool_clean(-1). */
int min_empty_chunks;
/** Size of each chunk (in items). */
int new_chunk_capacity;
/** Size to allocate for each item, including overhead and alignment
* padding. */
size_t item_alloc_size;
#ifdef MEMPOOL_STATS
/** Total number of items allocated ever. */
uint64_t total_items_allocated;
/** Total number of chunks allocated ever. */
uint64_t total_chunks_allocated;
/** Total number of chunks freed ever. */
uint64_t total_chunks_freed;
#endif
};
#endif
#endif
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