From 3b9b6d0b8e7f798023c9d109c490449d528fde80 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 17:59:48 +0200 Subject: Adding upstream version 1:9.18.19. Signed-off-by: Daniel Baumann --- lib/isc/include/isc/taskpool.h | 135 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 135 insertions(+) create mode 100644 lib/isc/include/isc/taskpool.h (limited to 'lib/isc/include/isc/taskpool.h') diff --git a/lib/isc/include/isc/taskpool.h b/lib/isc/include/isc/taskpool.h new file mode 100644 index 0000000..cde2287 --- /dev/null +++ b/lib/isc/include/isc/taskpool.h @@ -0,0 +1,135 @@ +/* + * Copyright (C) Internet Systems Consortium, Inc. ("ISC") + * + * SPDX-License-Identifier: MPL-2.0 + * + * 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 https://mozilla.org/MPL/2.0/. + * + * See the COPYRIGHT file distributed with this work for additional + * information regarding copyright ownership. + */ + +#pragma once + +/***** +***** Module Info +*****/ + +/*! \file isc/taskpool.h + * \brief A task pool is a mechanism for sharing a small number of tasks + * among a large number of objects such that each object is + * assigned a unique task, but each task may be shared by several + * objects. + * + * Task pools are used to let objects that can exist in large + * numbers (e.g., zones) use tasks for synchronization without + * the memory overhead and unfair scheduling competition that + * could result from creating a separate task for each object. + */ + +/*** + *** Imports. + ***/ + +#include + +#include +#include + +ISC_LANG_BEGINDECLS + +/***** +***** Types. +*****/ + +typedef struct isc_taskpool isc_taskpool_t; + +/***** +***** Functions. +*****/ + +isc_result_t +isc_taskpool_create(isc_taskmgr_t *tmgr, isc_mem_t *mctx, unsigned int ntasks, + unsigned int quantum, bool priv, isc_taskpool_t **poolp); +/*%< + * Create a task pool of "ntasks" tasks, each with quantum + * "quantum". + * + * Requires: + * + *\li 'tmgr' is a valid task manager. + * + *\li 'mctx' is a valid memory context. + * + *\li poolp != NULL && *poolp == NULL + * + * Ensures: + * + *\li On success, '*taskp' points to the new task pool. + * + * Returns: + * + *\li #ISC_R_SUCCESS + *\li #ISC_R_NOMEMORY + *\li #ISC_R_UNEXPECTED + */ + +void +isc_taskpool_gettask(isc_taskpool_t *pool, isc_task_t **targetp); +/*%< + * Attach to a task from the pool. Currently the next task is chosen + * from the pool at random. (This may be changed in the future to + * something that guaratees balance.) + */ + +int +isc_taskpool_size(isc_taskpool_t *pool); +/*%< + * Returns the number of tasks in the task pool 'pool'. + */ + +isc_result_t +isc_taskpool_expand(isc_taskpool_t **sourcep, unsigned int size, bool priv, + isc_taskpool_t **targetp); + +/*%< + * If 'size' is larger than the number of tasks in the pool pointed to by + * 'sourcep', then a new taskpool of size 'size' is allocated, the existing + * tasks from are moved into it, additional tasks are created to bring the + * total number up to 'size', and the resulting pool is attached to + * 'targetp'. + * + * If 'size' is less than or equal to the tasks in pool 'source', then + * 'sourcep' is attached to 'targetp' without any other action being taken. + * + * In either case, 'sourcep' is detached. + * + * Requires: + * + * \li 'sourcep' is not NULL and '*source' is not NULL + * \li 'targetp' is not NULL and '*source' is NULL + * + * Ensures: + * + * \li On success, '*targetp' points to a valid task pool. + * \li On success, '*sourcep' points to NULL. + * + * Returns: + * + * \li #ISC_R_SUCCESS + * \li #ISC_R_NOMEMORY + */ + +void +isc_taskpool_destroy(isc_taskpool_t **poolp); +/*%< + * Destroy a task pool. The tasks in the pool are detached but not + * shut down. + * + * Requires: + * \li '*poolp' is a valid task pool. + */ + +ISC_LANG_ENDDECLS -- cgit v1.2.3