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Diffstat (limited to 'lib/isc/include/isc/taskpool.h')
| -rw-r--r-- | lib/isc/include/isc/taskpool.h | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/lib/isc/include/isc/taskpool.h b/lib/isc/include/isc/taskpool.h new file mode 100644 index 0000000..fd07bfd --- /dev/null +++ b/lib/isc/include/isc/taskpool.h @@ -0,0 +1,105 @@ +/* + * Copyright (C) 2004-2007 Internet Systems Consortium, Inc. ("ISC") + * Copyright (C) 1999-2001 Internet Software Consortium. + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH + * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY + * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, + * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM + * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE + * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR + * PERFORMANCE OF THIS SOFTWARE. + */ + +/* $Id: taskpool.h,v 1.15 2007/06/19 23:47:18 tbox Exp $ */ + +#ifndef ISC_TASKPOOL_H +#define ISC_TASKPOOL_H 1 + +/***** + ***** 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 <isc/lang.h> +#include <isc/task.h> + +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, + 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, unsigned int hash, + isc_task_t **targetp); +/*%< + * Attach to the task corresponding to the hash value "hash". + */ + +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 + +#endif /* ISC_TASKPOOL_H */ |