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106 lines
3.7 KiB
C
106 lines
3.7 KiB
C
/*
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* Copyright (c) 2007-2012, The Tor Project, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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*
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* * Neither the names of the copyright owners nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/* Imported from hybrid svn:
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* \file mempool.h
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* \brief Pooling allocator
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* \version $Id: mempool.h 1662 2012-11-17 20:11:33Z michael $
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*/
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#ifndef TOR_MEMPOOL_H
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#define TOR_MEMPOOL_H
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#ifdef _WIN32
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#define uint64_t unsigned __int64
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#endif
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/** A memory pool is a context in which a large number of fixed-sized
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* objects can be allocated efficiently. See mempool.c for implementation
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* details. */
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typedef struct mp_pool_t mp_pool_t;
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extern void mp_pool_init(void);
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extern void *mp_pool_get(mp_pool_t *);
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extern void mp_pool_release(void *);
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extern mp_pool_t *mp_pool_new(size_t, size_t);
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extern void mp_pool_clean(mp_pool_t *, int, int);
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extern void mp_pool_destroy(mp_pool_t *);
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extern void mp_pool_assert_ok(mp_pool_t *);
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extern void mp_pool_log_status(mp_pool_t *);
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extern void mp_pool_garbage_collect(void *);
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#define MEMPOOL_STATS
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struct mp_pool_t {
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/** Next pool. A pool is usually linked into the mp_allocated_pools list. */
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mp_pool_t *next;
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/** Doubly-linked list of chunks in which no items have been allocated.
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* The front of the list is the most recently emptied chunk. */
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struct mp_chunk_t *empty_chunks;
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/** Doubly-linked list of chunks in which some items have been allocated,
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* but which are not yet full. The front of the list is the chunk that has
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* most recently been modified. */
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struct mp_chunk_t *used_chunks;
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/** Doubly-linked list of chunks in which no more items can be allocated.
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* The front of the list is the chunk that has most recently become full. */
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struct mp_chunk_t *full_chunks;
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/** Length of <b>empty_chunks</b>. */
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int n_empty_chunks;
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/** Lowest value of <b>empty_chunks</b> since last call to
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* mp_pool_clean(-1). */
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int min_empty_chunks;
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/** Size of each chunk (in items). */
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int new_chunk_capacity;
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/** Size to allocate for each item, including overhead and alignment
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* padding. */
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size_t item_alloc_size;
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#ifdef MEMPOOL_STATS
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/** Total number of items allocated ever. */
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uint64_t total_items_allocated;
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/** Total number of chunks allocated ever. */
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uint64_t total_chunks_allocated;
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/** Total number of chunks freed ever. */
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uint64_t total_chunks_freed;
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#endif
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};
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#endif
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