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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
/*! \file */
#include <config.h>
#include <string.h>
#include <isc/mem.h>
#include <isc/random.h>
#include <isc/pool.h>
#include <isc/util.h>
/***
*** Types.
***/
struct isc_pool {
isc_mem_t * mctx;
unsigned int count;
isc_pooldeallocator_t free;
isc_poolinitializer_t init;
void * initarg;
void ** pool;
};
/***
*** Functions.
***/
static isc_result_t
alloc_pool(isc_mem_t *mctx, unsigned int count, isc_pool_t **poolp) {
isc_pool_t *pool;
pool = isc_mem_get(mctx, sizeof(*pool));
if (pool == NULL)
return (ISC_R_NOMEMORY);
pool->count = count;
pool->free = NULL;
pool->init = NULL;
pool->initarg = NULL;
pool->mctx = NULL;
isc_mem_attach(mctx, &pool->mctx);
pool->pool = isc_mem_get(mctx, count * sizeof(void *));
if (pool->pool == NULL) {
isc_mem_put(mctx, pool, sizeof(*pool));
return (ISC_R_NOMEMORY);
}
memset(pool->pool, 0, count * sizeof(void *));
*poolp = pool;
return (ISC_R_SUCCESS);
}
isc_result_t
isc_pool_create(isc_mem_t *mctx, unsigned int count,
isc_pooldeallocator_t release,
isc_poolinitializer_t init, void *initarg,
isc_pool_t **poolp)
{
isc_pool_t *pool = NULL;
isc_result_t result;
unsigned int i;
INSIST(count > 0);
/* Allocate the pool structure */
result = alloc_pool(mctx, count, &pool);
if (result != ISC_R_SUCCESS)
return (result);
pool->free = release;
pool->init = init;
pool->initarg = initarg;
/* Populate the pool */
for (i = 0; i < count; i++) {
result = init(&pool->pool[i], initarg);
if (result != ISC_R_SUCCESS) {
isc_pool_destroy(&pool);
return (result);
}
}
*poolp = pool;
return (ISC_R_SUCCESS);
}
void *
isc_pool_get(isc_pool_t *pool) {
uint32_t i;
isc_random_get(&i);
return (pool->pool[i % pool->count]);
}
int
isc_pool_count(isc_pool_t *pool) {
REQUIRE(pool != NULL);
return (pool->count);
}
isc_result_t
isc_pool_expand(isc_pool_t **sourcep, unsigned int count,
isc_pool_t **targetp)
{
isc_result_t result;
isc_pool_t *pool;
REQUIRE(sourcep != NULL && *sourcep != NULL);
REQUIRE(targetp != NULL && *targetp == NULL);
pool = *sourcep;
if (count > pool->count) {
isc_pool_t *newpool = NULL;
unsigned int i;
/* Allocate a new pool structure */
result = alloc_pool(pool->mctx, count, &newpool);
if (result != ISC_R_SUCCESS)
return (result);
newpool->free = pool->free;
newpool->init = pool->init;
newpool->initarg = pool->initarg;
/* Copy over the objects from the old pool */
for (i = 0; i < pool->count; i++) {
newpool->pool[i] = pool->pool[i];
pool->pool[i] = NULL;
}
/* Populate the new entries */
for (i = pool->count; i < count; i++) {
result = pool->init(&newpool->pool[i], pool->initarg);
if (result != ISC_R_SUCCESS) {
isc_pool_destroy(&pool);
return (result);
}
}
isc_pool_destroy(&pool);
pool = newpool;
}
*sourcep = NULL;
*targetp = pool;
return (ISC_R_SUCCESS);
}
void
isc_pool_destroy(isc_pool_t **poolp) {
unsigned int i;
isc_pool_t *pool = *poolp;
for (i = 0; i < pool->count; i++) {
if (pool->free != NULL && pool->pool[i] != NULL)
pool->free(&pool->pool[i]);
}
isc_mem_put(pool->mctx, pool->pool, pool->count * sizeof(void *));
isc_mem_putanddetach(&pool->mctx, pool, sizeof(*pool));
*poolp = NULL;
}
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