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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* 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.c,v 1.3 2019/12/17 01:46:34 sthen Exp $ */
/*! \file */
#include <config.h>
#include <isc/mem.h>
#include <isc/random.h>
#include <isc/taskpool.h>
#include <isc/util.h>
/***
*** Types.
***/
struct isc_taskpool {
isc_mem_t * mctx;
isc_taskmgr_t * tmgr;
unsigned int ntasks;
unsigned int quantum;
isc_task_t ** tasks;
};
/***
*** Functions.
***/
static isc_result_t
alloc_pool(isc_taskmgr_t *tmgr, isc_mem_t *mctx, unsigned int ntasks,
unsigned int quantum, isc_taskpool_t **poolp)
{
isc_taskpool_t *pool;
unsigned int i;
pool = isc_mem_get(mctx, sizeof(*pool));
if (pool == NULL)
return (ISC_R_NOMEMORY);
pool->mctx = NULL;
isc_mem_attach(mctx, &pool->mctx);
pool->ntasks = ntasks;
pool->quantum = quantum;
pool->tmgr = tmgr;
pool->tasks = isc_mem_get(mctx, ntasks * sizeof(isc_task_t *));
if (pool->tasks == NULL) {
isc_mem_putanddetach(&pool->mctx, pool, sizeof(*pool));
return (ISC_R_NOMEMORY);
}
for (i = 0; i < ntasks; i++)
pool->tasks[i] = NULL;
*poolp = pool;
return (ISC_R_SUCCESS);
}
isc_result_t
isc_taskpool_create(isc_taskmgr_t *tmgr, isc_mem_t *mctx,
unsigned int ntasks, unsigned int quantum,
isc_taskpool_t **poolp)
{
unsigned int i;
isc_taskpool_t *pool = NULL;
isc_result_t result;
INSIST(ntasks > 0);
/* Allocate the pool structure */
result = alloc_pool(tmgr, mctx, ntasks, quantum, &pool);
if (result != ISC_R_SUCCESS)
return (result);
/* Create the tasks */
for (i = 0; i < ntasks; i++) {
result = isc_task_create(tmgr, quantum, &pool->tasks[i]);
if (result != ISC_R_SUCCESS) {
isc_taskpool_destroy(&pool);
return (result);
}
isc_task_setname(pool->tasks[i], "taskpool", NULL);
}
*poolp = pool;
return (ISC_R_SUCCESS);
}
void
isc_taskpool_gettask(isc_taskpool_t *pool, isc_task_t **targetp) {
isc_uint32_t i;
isc_random_get(&i);
isc_task_attach(pool->tasks[i % pool->ntasks], targetp);
}
int
isc_taskpool_size(isc_taskpool_t *pool) {
REQUIRE(pool != NULL);
return (pool->ntasks);
}
isc_result_t
isc_taskpool_expand(isc_taskpool_t **sourcep, unsigned int size,
isc_taskpool_t **targetp)
{
isc_result_t result;
isc_taskpool_t *pool;
REQUIRE(sourcep != NULL && *sourcep != NULL);
REQUIRE(targetp != NULL && *targetp == NULL);
pool = *sourcep;
if (size > pool->ntasks) {
isc_taskpool_t *newpool = NULL;
unsigned int i;
/* Allocate a new pool structure */
result = alloc_pool(pool->tmgr, pool->mctx, size,
pool->quantum, &newpool);
if (result != ISC_R_SUCCESS)
return (result);
/* Copy over the tasks from the old pool */
for (i = 0; i < pool->ntasks; i++) {
newpool->tasks[i] = pool->tasks[i];
pool->tasks[i] = NULL;
}
/* Create new tasks */
for (i = pool->ntasks; i < size; i++) {
result = isc_task_create(pool->tmgr, pool->quantum,
&newpool->tasks[i]);
if (result != ISC_R_SUCCESS) {
isc_taskpool_destroy(&newpool);
return (result);
}
isc_task_setname(newpool->tasks[i], "taskpool", NULL);
}
isc_taskpool_destroy(&pool);
pool = newpool;
}
*sourcep = NULL;
*targetp = pool;
return (ISC_R_SUCCESS);
}
void
isc_taskpool_destroy(isc_taskpool_t **poolp) {
unsigned int i;
isc_taskpool_t *pool = *poolp;
for (i = 0; i < pool->ntasks; i++) {
if (pool->tasks[i] != NULL)
isc_task_detach(&pool->tasks[i]);
}
isc_mem_put(pool->mctx, pool->tasks,
pool->ntasks * sizeof(isc_task_t *));
isc_mem_putanddetach(&pool->mctx, pool, sizeof(*pool));
*poolp = NULL;
}
void
isc_taskpool_setprivilege(isc_taskpool_t *pool, isc_boolean_t priv) {
unsigned int i;
REQUIRE(pool != NULL);
for (i = 0; i < pool->ntasks; i++) {
if (pool->tasks[i] != NULL)
isc_task_setprivilege(pool->tasks[i], priv);
}
}
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