00b67f09dd
Also known as ISC bind. This import adds utilities such as host(1), dig(1), and nslookup(1), as well as many other tools and libraries. Change-Id: I035ca46e64f1965d57019e773f4ff0ef035e4aa3
152 lines
3.9 KiB
C
152 lines
3.9 KiB
C
/* $NetBSD: pool.h,v 1.1.1.3 2014/12/10 03:34:44 christos Exp $ */
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/*
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* Copyright (C) 2013 Internet Systems Consortium, Inc. ("ISC")
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*
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* Permission to use, copy, modify, and/or 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 ISC DISCLAIMS ALL WARRANTIES WITH
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* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
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* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef ISC_OBJPOOL_H
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#define ISC_OBJPOOL_H 1
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/*****
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***** Module Info
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*****/
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/*! \file isc/pool.h
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* \brief An object pool is a mechanism for sharing a small pool of
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* fungible objects among a large number of objects that depend on them.
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*
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* This is useful, for example, when it causes performance problems for
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* large number of zones to share a single memory context or task object,
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* but it would create a different set of problems for them each to have an
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* independent task or memory context.
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*/
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/***
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*** Imports.
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***/
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#include <isc/lang.h>
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#include <isc/mem.h>
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#include <isc/types.h>
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ISC_LANG_BEGINDECLS
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/*****
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***** Types.
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*****/
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typedef void
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(*isc_pooldeallocator_t)(void **object);
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typedef isc_result_t
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(*isc_poolinitializer_t)(void **target, void *arg);
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typedef struct isc_pool isc_pool_t;
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/*****
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***** Functions.
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*****/
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isc_result_t
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isc_pool_create(isc_mem_t *mctx, unsigned int count,
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isc_pooldeallocator_t free,
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isc_poolinitializer_t init, void *initarg,
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isc_pool_t **poolp);
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/*%<
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* Create a pool of "count" object pointers. If 'free' is not NULL,
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* it points to a function that will detach the objects. 'init'
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* points to a function that will initialize the arguments, and
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* 'arg' to an argument to be passed into that function (for example,
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* a relevant manager or context object).
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*
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* Requires:
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*
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*\li 'mctx' is a valid memory context.
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*
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*\li init != NULL
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*
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*\li poolp != NULL && *poolp == NULL
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*
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* Ensures:
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*
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*\li On success, '*poolp' points to the new object pool.
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*
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* Returns:
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*
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*\li #ISC_R_SUCCESS
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*\li #ISC_R_NOMEMORY
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*\li #ISC_R_UNEXPECTED
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*/
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void *
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isc_pool_get(isc_pool_t *pool);
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/*%<
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* Returns a pointer to an object from the pool. Currently the object
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* is chosen from the pool at random. (This may be changed in the future
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* to something that guaratees balance.)
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*/
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int
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isc_pool_count(isc_pool_t *pool);
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/*%<
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* Returns the number of objcts in the pool 'pool'.
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*/
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isc_result_t
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isc_pool_expand(isc_pool_t **sourcep, unsigned int count, isc_pool_t **targetp);
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/*%<
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* If 'size' is larger than the number of objects in the pool pointed to by
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* 'sourcep', then a new pool of size 'count' is allocated, the existing
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* objects are copied into it, additional ones created to bring the
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* total number up to 'count', and the resulting pool is attached to
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* 'targetp'.
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*
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* If 'count' is less than or equal to the number of objects in 'source', then
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* 'sourcep' is attached to 'targetp' without any other action being taken.
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*
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* In either case, 'sourcep' is detached.
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*
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* Requires:
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*
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* \li 'sourcep' is not NULL and '*source' is not NULL
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* \li 'targetp' is not NULL and '*source' is NULL
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*
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* Ensures:
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*
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* \li On success, '*targetp' points to a valid task pool.
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* \li On success, '*sourcep' points to NULL.
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*
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* Returns:
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*
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* \li #ISC_R_SUCCESS
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* \li #ISC_R_NOMEMORY
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*/
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void
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isc_pool_destroy(isc_pool_t **poolp);
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/*%<
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* Destroy a task pool. The tasks in the pool are detached but not
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* shut down.
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*
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* Requires:
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* \li '*poolp' is a valid task pool.
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*/
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ISC_LANG_ENDDECLS
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#endif /* ISC_OBJPOOL_H */
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