external/bsd/bind/dist/lib/isc/taskpool.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (C) 2004, 2005, 2007  Internet Systems Consortium, Inc. ("ISC")
   5  * Copyright (C) 1999-2001  Internet Software Consortium.
   6  *
   7  * Permission to use, copy, modify, and/or distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  12  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  13  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  14  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  15  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  16  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  17  * PERFORMANCE OF THIS SOFTWARE.
  18  */
  19
  20 /* Id: taskpool.c,v 1.18 2007/06/18 23:47:44 tbox Exp */
  21
  22 /*! \file */
  23
  24 #include <config.h>
  25
  26 #include <isc/mem.h>
  27 #include <isc/taskpool.h>
  28 #include <isc/util.h>
  29
  30 /***
  31  *** Types.
  32  ***/
  33
  34 struct isc_taskpool {
  35         isc_mem_t *                     mctx;
  36         unsigned int                    ntasks;
  37         isc_task_t **                   tasks;
  38 };
  39 /***
  40  *** Functions.
  41  ***/
  42
  43 isc_result_t
  44 isc_taskpool_create(isc_taskmgr_t *tmgr, isc_mem_t *mctx,
  45                     unsigned int ntasks, unsigned int quantum,
  46                     isc_taskpool_t **poolp)
  47 {
  48         unsigned int i;
  49         isc_taskpool_t *pool;
  50         isc_result_t result;
  51
  52         INSIST(ntasks > 0);
  53         pool = isc_mem_get(mctx, sizeof(*pool));
  54         if (pool == NULL)
  55                 return (ISC_R_NOMEMORY);
  56         pool->mctx = mctx;
  57         pool->ntasks = ntasks;
  58         pool->tasks = isc_mem_get(mctx, ntasks * sizeof(isc_task_t *));
  59         if (pool->tasks == NULL) {
  60                 isc_mem_put(mctx, pool, sizeof(*pool));
  61                 return (ISC_R_NOMEMORY);
  62         }
  63         for (i = 0; i < ntasks; i++)
  64                 pool->tasks[i] = NULL;
  65         for (i = 0; i < ntasks; i++) {
  66                 result = isc_task_create(tmgr, quantum, &pool->tasks[i]);
  67                 if (result != ISC_R_SUCCESS) {
  68                         isc_taskpool_destroy(&pool);
  69                         return (result);
  70                 }
  71                 isc_task_setname(pool->tasks[i], "taskpool", NULL);
  72         }
  73         *poolp = pool;
  74         return (ISC_R_SUCCESS);
  75 }
  76
  77 void isc_taskpool_gettask(isc_taskpool_t *pool, unsigned int hash,
  78                           isc_task_t **targetp)
  79 {
  80         isc_task_attach(pool->tasks[hash % pool->ntasks], targetp);
  81 }
  82
  83 void
  84 isc_taskpool_destroy(isc_taskpool_t **poolp) {
  85         unsigned int i;
  86         isc_taskpool_t *pool = *poolp;
  87         for (i = 0; i < pool->ntasks; i++) {
  88                 if (pool->tasks[i] != NULL) {
  89                         isc_task_detach(&pool->tasks[i]);
  90                 }
  91         }
  92         isc_mem_put(pool->mctx, pool->tasks,
  93                     pool->ntasks * sizeof(isc_task_t *));
  94         isc_mem_put(pool->mctx, pool, sizeof(*pool));
  95         *poolp = NULL;
  96 }
  97
  98