mirror of https://git.kore.io/kore.git
151 lines
3.6 KiB
C
151 lines
3.6 KiB
C
/*
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* Copyright (c) 2013-2016 Joris Vink <joris@coders.se>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/queue.h>
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#include "kore.h"
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#define POOL_ELEMENT_BUSY 0
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#define POOL_ELEMENT_FREE 1
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static void pool_region_create(struct kore_pool *, u_int32_t);
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static void pool_region_destroy(struct kore_pool *);
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void
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kore_pool_init(struct kore_pool *pool, const char *name,
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u_int32_t len, u_int32_t elm)
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{
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kore_debug("kore_pool_init(%p, %s, %d, %d)", pool, name, len, elm);
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pool->elms = 0;
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pool->inuse = 0;
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pool->elen = len;
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pool->name = kore_strdup(name);
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pool->slen = pool->elen + sizeof(struct kore_pool_entry);
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LIST_INIT(&(pool->regions));
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LIST_INIT(&(pool->freelist));
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pool_region_create(pool, elm);
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}
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void
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kore_pool_cleanup(struct kore_pool *pool)
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{
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pool->elms = 0;
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pool->inuse = 0;
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pool->elen = 0;
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pool->slen = 0;
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if (pool->name != NULL) {
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kore_mem_free(pool->name);
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pool->name = NULL;
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}
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pool_region_destroy(pool);
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}
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void *
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kore_pool_get(struct kore_pool *pool)
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{
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u_int8_t *ptr;
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struct kore_pool_entry *entry;
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if (LIST_EMPTY(&(pool->freelist))) {
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kore_log(LOG_NOTICE, "pool %s is exhausted (%d/%d)",
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pool->name, pool->inuse, pool->elms);
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pool_region_create(pool, pool->elms);
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}
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entry = LIST_FIRST(&(pool->freelist));
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if (entry->state != POOL_ELEMENT_FREE)
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fatal("%s: element %p was not free", pool->name, entry);
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LIST_REMOVE(entry, list);
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entry->state = POOL_ELEMENT_BUSY;
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ptr = (u_int8_t *)entry + sizeof(struct kore_pool_entry);
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pool->inuse++;
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return (ptr);
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}
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void
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kore_pool_put(struct kore_pool *pool, void *ptr)
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{
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struct kore_pool_entry *entry;
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entry = (struct kore_pool_entry *)
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((u_int8_t *)ptr - sizeof(struct kore_pool_entry));
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if (entry->state != POOL_ELEMENT_BUSY)
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fatal("%s: element %p was not busy", pool->name, ptr);
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entry->state = POOL_ELEMENT_FREE;
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LIST_INSERT_HEAD(&(pool->freelist), entry, list);
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pool->inuse--;
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}
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static void
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pool_region_create(struct kore_pool *pool, u_int32_t elms)
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{
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u_int32_t i;
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u_int8_t *p;
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struct kore_pool_region *reg;
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struct kore_pool_entry *entry;
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kore_debug("pool_region_create(%p, %d)", pool, elms);
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reg = kore_malloc(sizeof(struct kore_pool_region));
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LIST_INSERT_HEAD(&(pool->regions), reg, list);
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reg->start = kore_malloc(elms * pool->slen);
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p = (u_int8_t *)reg->start;
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for (i = 0; i < elms; i++) {
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entry = (struct kore_pool_entry *)p;
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entry->region = reg;
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entry->state = POOL_ELEMENT_FREE;
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LIST_INSERT_HEAD(&(pool->freelist), entry, list);
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p = p + pool->slen;
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}
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pool->elms += elms;
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}
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static void
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pool_region_destroy(struct kore_pool *pool)
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{
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struct kore_pool_region *reg;
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kore_debug("pool_region_destroy(%p)", pool);
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/* Take care iterating when modifying list contents */
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while (!LIST_EMPTY(&pool->regions)) {
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reg = LIST_FIRST(&pool->regions);
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LIST_REMOVE(reg, list);
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kore_mem_free(reg->start);
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kore_mem_free(reg);
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}
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/* Freelist references into the regions memory allocations */
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LIST_INIT(&pool->freelist);
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pool->elms = 0;
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}
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