contrib/bind-9.2.4rc7/lib/isc/taskpool.c

   1 /*
   2  * Copyright (C) 2004  Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (C) 1999-2001  Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  10  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  11  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  12  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  13  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  14  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  15  * PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 /* $Id: taskpool.c,v 1.10.2.1 2004/03/09 06:11:52 marka Exp $ */
  19
  20 #include <config.h>
  21
  22 #include <isc/mem.h>
  23 #include <isc/taskpool.h>
  24 #include <isc/util.h>
  25
  26 /***
  27  *** Types.
  28  ***/
  29
  30 struct isc_taskpool {
  31         isc_mem_t *                     mctx;
  32         unsigned int                    ntasks;
  33         isc_task_t **                   tasks;
  34 };
  35 /***
  36  *** Functions.
  37  ***/
  38
  39 isc_result_t
  40 isc_taskpool_create(isc_taskmgr_t *tmgr, isc_mem_t *mctx,
  41                     unsigned int ntasks, unsigned int quantum,
  42                     isc_taskpool_t **poolp)
  43 {
  44         unsigned int i;
  45         isc_taskpool_t *pool;
  46         isc_result_t result;
  47
  48         INSIST(ntasks > 0);
  49         pool = isc_mem_get(mctx, sizeof *pool);
  50         if (pool == NULL)
  51                 return (ISC_R_NOMEMORY);
  52         pool->mctx = mctx;
  53         pool->ntasks = ntasks;
  54         pool->tasks = isc_mem_get(mctx, ntasks * sizeof(isc_task_t *));
  55         for (i = 0; i < ntasks; i++)
  56                 pool->tasks[i] = NULL;
  57         for (i = 0; i < ntasks; i++) {
  58                 result = isc_task_create(tmgr, quantum, &pool->tasks[i]);
  59                 if (result != ISC_R_SUCCESS) {
  60                         isc_taskpool_destroy(&pool);
  61                         return (result);
  62                 }
  63         }
  64         *poolp = pool;
  65         return (ISC_R_SUCCESS);
  66 }
  67
  68 void isc_taskpool_gettask(isc_taskpool_t *pool, unsigned int hash,
  69                           isc_task_t **targetp)
  70 {
  71         isc_task_attach(pool->tasks[hash % pool->ntasks], targetp);
  72 }
  73
  74 void
  75 isc_taskpool_destroy(isc_taskpool_t **poolp) {
  76         unsigned int i;
  77         isc_taskpool_t *pool = *poolp;
  78         for (i = 0; i < pool->ntasks; i++) {
  79                 if (pool->tasks[i] != NULL) {
  80                         isc_task_detach(&pool->tasks[i]);
  81                 }
  82         }
  83         isc_mem_put(pool->mctx, pool->tasks,
  84                     pool->ntasks * sizeof(isc_task_t *));
  85         isc_mem_put(pool->mctx, pool, sizeof(*pool));
  86         *poolp = NULL;
  87 }
  88
  89