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Diffstat (limited to '')
| -rw-r--r-- | lib/isc/taskpool.c | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/lib/isc/taskpool.c b/lib/isc/taskpool.c new file mode 100644 index 0000000..5dfc1d1 --- /dev/null +++ b/lib/isc/taskpool.c @@ -0,0 +1,182 @@ +/* + * Copyright (C) Internet Systems Consortium, Inc. ("ISC") + * + * 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 http://mozilla.org/MPL/2.0/. + * + * See the COPYRIGHT file distributed with this work for additional + * information regarding copyright ownership. + */ + + +/*! \file */ + +#include <config.h> + +#include <stdbool.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) { + 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, bool 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); + } +} |