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122 lines
2.8 KiB
122 lines
2.8 KiB
3 months ago
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/*
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* UCW Library -- Fast Allocator for Fixed-Size Elements
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*
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* (c) 2007 Martin Mares <mj@ucw.cz>
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*
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* This software may be freely distributed and used according to the terms
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* of the GNU Lesser General Public License.
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*/
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#ifndef _UCW_ELTPOOL_H
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#define _UCW_ELTPOOL_H
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#ifdef CONFIG_UCW_CLEAN_ABI
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#define ep_alloc_slow ucw_ep_alloc_slow
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#define ep_delete ucw_ep_delete
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#define ep_new ucw_ep_new
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#define ep_total_size ucw_ep_total_size
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#endif
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/***
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* [[defs]]
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* Definitions
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* -----------
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***/
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/**
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* Memory pool of fixed-sized elements.
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* You should use this one as an opaque handle only, the insides are internal.
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**/
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struct eltpool {
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struct eltpool_chunk *first_chunk;
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struct eltpool_free *first_free;
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uint elt_size;
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uint chunk_size;
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uint elts_per_chunk;
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uint num_allocated; // Just for debugging
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uint num_chunks;
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};
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struct eltpool_chunk {
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struct eltpool_chunk *next;
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/* Chunk data continue here */
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};
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struct eltpool_free {
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struct eltpool_free *next;
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};
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/***
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* [[basic]]
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* Basic manipulation
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* ------------------
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***/
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/**
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* Create a new memory pool for elements of @elt_size bytes.
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* The pool will allocate chunks of at least @elts_per_chunk elements.
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* Higher numbers lead to better allocation times but also to bigger
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* unused memory blocks. Call @ep_delete() to free all pool's resources.
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*
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* Element pools can be treated as <<trans:respools,resources>>, see <<trans:res_eltpool()>>.
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**/
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struct eltpool *ep_new(uint elt_size, uint elts_per_chunk);
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/**
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* Release a memory pool created by @ep_new() including all
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* elements allocated from that pool.
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**/
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void ep_delete(struct eltpool *pool);
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/**
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* Return the total number of bytes allocated by a given
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* memory pool including all internals.
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**/
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u64 ep_total_size(struct eltpool *pool);
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/***
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* [[alloc]]
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* Allocation routines
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* -------------------
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***/
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void *ep_alloc_slow(struct eltpool *pool); /* Internal. Do not call directly. */
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/**
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* Allocate a new element on a given memory pool.
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* The results is always aligned to a multiple of the element's size.
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**/
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static inline void *ep_alloc(struct eltpool *pool)
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{
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pool->num_allocated++;
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#ifdef CONFIG_UCW_FAKE_ELTPOOL
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return xmalloc(pool->elt_size);
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#else
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struct eltpool_free *elt;
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if (elt = pool->first_free)
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pool->first_free = elt->next;
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else
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elt = ep_alloc_slow(pool);
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return elt;
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#endif
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}
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/**
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* Release an element previously allocated by @ep_alloc().
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* Note thet the memory is not really freed (until @mp_delete()),
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* but it can be reused by future @ep_alloc()'s.
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**/
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static inline void ep_free(struct eltpool *pool, void *p)
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{
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pool->num_allocated--;
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#ifdef CONFIG_UCW_FAKE_ELTPOOL
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(void) pool;
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xfree(p);
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#else
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struct eltpool_free *elt = p;
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elt->next = pool->first_free;
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pool->first_free = elt;
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#endif
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}
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#endif
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