diff options
Diffstat (limited to 'contrib/opensolaris/lib/libzpool/common/taskq.c')
| -rw-r--r-- | contrib/opensolaris/lib/libzpool/common/taskq.c | 250 |
1 files changed, 0 insertions, 250 deletions
diff --git a/contrib/opensolaris/lib/libzpool/common/taskq.c b/contrib/opensolaris/lib/libzpool/common/taskq.c deleted file mode 100644 index f7b6571..0000000 --- a/contrib/opensolaris/lib/libzpool/common/taskq.c +++ /dev/null @@ -1,250 +0,0 @@ -/* - * CDDL HEADER START - * - * The contents of this file are subject to the terms of the - * Common Development and Distribution License, Version 1.0 only - * (the "License"). You may not use this file except in compliance - * with the License. - * - * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE - * or http://www.opensolaris.org/os/licensing. - * See the License for the specific language governing permissions - * and limitations under the License. - * - * When distributing Covered Code, include this CDDL HEADER in each - * file and include the License file at usr/src/OPENSOLARIS.LICENSE. - * If applicable, add the following below this CDDL HEADER, with the - * fields enclosed by brackets "[]" replaced with your own identifying - * information: Portions Copyright [yyyy] [name of copyright owner] - * - * CDDL HEADER END - */ -/* - * Copyright 2005 Sun Microsystems, Inc. All rights reserved. - * Use is subject to license terms. - */ - -#pragma ident "%Z%%M% %I% %E% SMI" - -#include <sys/zfs_context.h> - -int taskq_now; - -typedef struct task { - struct task *task_next; - struct task *task_prev; - task_func_t *task_func; - void *task_arg; -} task_t; - -#define TASKQ_ACTIVE 0x00010000 - -struct taskq { - kmutex_t tq_lock; - krwlock_t tq_threadlock; - kcondvar_t tq_dispatch_cv; - kcondvar_t tq_wait_cv; - thread_t *tq_threadlist; - int tq_flags; - int tq_active; - int tq_nthreads; - int tq_nalloc; - int tq_minalloc; - int tq_maxalloc; - task_t *tq_freelist; - task_t tq_task; -}; - -static task_t * -task_alloc(taskq_t *tq, int tqflags) -{ - task_t *t; - - if ((t = tq->tq_freelist) != NULL && tq->tq_nalloc >= tq->tq_minalloc) { - tq->tq_freelist = t->task_next; - } else { - mutex_exit(&tq->tq_lock); - if (tq->tq_nalloc >= tq->tq_maxalloc) { - if (!(tqflags & KM_SLEEP)) { - mutex_enter(&tq->tq_lock); - return (NULL); - } - /* - * We don't want to exceed tq_maxalloc, but we can't - * wait for other tasks to complete (and thus free up - * task structures) without risking deadlock with - * the caller. So, we just delay for one second - * to throttle the allocation rate. - */ - delay(hz); - } - t = kmem_alloc(sizeof (task_t), tqflags); - mutex_enter(&tq->tq_lock); - if (t != NULL) - tq->tq_nalloc++; - } - return (t); -} - -static void -task_free(taskq_t *tq, task_t *t) -{ - if (tq->tq_nalloc <= tq->tq_minalloc) { - t->task_next = tq->tq_freelist; - tq->tq_freelist = t; - } else { - tq->tq_nalloc--; - mutex_exit(&tq->tq_lock); - kmem_free(t, sizeof (task_t)); - mutex_enter(&tq->tq_lock); - } -} - -taskqid_t -taskq_dispatch(taskq_t *tq, task_func_t func, void *arg, uint_t tqflags) -{ - task_t *t; - - if (taskq_now) { - func(arg); - return (1); - } - - mutex_enter(&tq->tq_lock); - ASSERT(tq->tq_flags & TASKQ_ACTIVE); - if ((t = task_alloc(tq, tqflags)) == NULL) { - mutex_exit(&tq->tq_lock); - return (0); - } - t->task_next = &tq->tq_task; - t->task_prev = tq->tq_task.task_prev; - t->task_next->task_prev = t; - t->task_prev->task_next = t; - t->task_func = func; - t->task_arg = arg; - cv_signal(&tq->tq_dispatch_cv); - mutex_exit(&tq->tq_lock); - return (1); -} - -void -taskq_wait(taskq_t *tq) -{ - mutex_enter(&tq->tq_lock); - while (tq->tq_task.task_next != &tq->tq_task || tq->tq_active != 0) - cv_wait(&tq->tq_wait_cv, &tq->tq_lock); - mutex_exit(&tq->tq_lock); -} - -static void * -taskq_thread(void *arg) -{ - taskq_t *tq = arg; - task_t *t; - - mutex_enter(&tq->tq_lock); - while (tq->tq_flags & TASKQ_ACTIVE) { - if ((t = tq->tq_task.task_next) == &tq->tq_task) { - if (--tq->tq_active == 0) - cv_broadcast(&tq->tq_wait_cv); - cv_wait(&tq->tq_dispatch_cv, &tq->tq_lock); - tq->tq_active++; - continue; - } - t->task_prev->task_next = t->task_next; - t->task_next->task_prev = t->task_prev; - mutex_exit(&tq->tq_lock); - - rw_enter(&tq->tq_threadlock, RW_READER); - t->task_func(t->task_arg); - rw_exit(&tq->tq_threadlock); - - mutex_enter(&tq->tq_lock); - task_free(tq, t); - } - tq->tq_nthreads--; - cv_broadcast(&tq->tq_wait_cv); - mutex_exit(&tq->tq_lock); - return (NULL); -} - -/*ARGSUSED*/ -taskq_t * -taskq_create(const char *name, int nthreads, pri_t pri, - int minalloc, int maxalloc, uint_t flags) -{ - taskq_t *tq = kmem_zalloc(sizeof (taskq_t), KM_SLEEP); - int t; - - rw_init(&tq->tq_threadlock, NULL, RW_DEFAULT, NULL); - tq->tq_flags = flags | TASKQ_ACTIVE; - tq->tq_active = nthreads; - tq->tq_nthreads = nthreads; - tq->tq_minalloc = minalloc; - tq->tq_maxalloc = maxalloc; - tq->tq_task.task_next = &tq->tq_task; - tq->tq_task.task_prev = &tq->tq_task; - tq->tq_threadlist = kmem_alloc(nthreads * sizeof (thread_t), KM_SLEEP); - - if (flags & TASKQ_PREPOPULATE) { - mutex_enter(&tq->tq_lock); - while (minalloc-- > 0) - task_free(tq, task_alloc(tq, KM_SLEEP)); - mutex_exit(&tq->tq_lock); - } - - for (t = 0; t < nthreads; t++) - (void) thr_create(0, 0, taskq_thread, - tq, THR_BOUND, &tq->tq_threadlist[t]); - - return (tq); -} - -void -taskq_destroy(taskq_t *tq) -{ - int t; - int nthreads = tq->tq_nthreads; - - taskq_wait(tq); - - mutex_enter(&tq->tq_lock); - - tq->tq_flags &= ~TASKQ_ACTIVE; - cv_broadcast(&tq->tq_dispatch_cv); - - while (tq->tq_nthreads != 0) - cv_wait(&tq->tq_wait_cv, &tq->tq_lock); - - tq->tq_minalloc = 0; - while (tq->tq_nalloc != 0) { - ASSERT(tq->tq_freelist != NULL); - task_free(tq, task_alloc(tq, KM_SLEEP)); - } - - mutex_exit(&tq->tq_lock); - - for (t = 0; t < nthreads; t++) - (void) thr_join(tq->tq_threadlist[t], NULL, NULL); - - kmem_free(tq->tq_threadlist, nthreads * sizeof (thread_t)); - - rw_destroy(&tq->tq_threadlock); - - kmem_free(tq, sizeof (taskq_t)); -} - -int -taskq_member(taskq_t *tq, void *t) -{ - int i; - - if (taskq_now) - return (1); - - for (i = 0; i < tq->tq_nthreads; i++) - if (tq->tq_threadlist[i] == (thread_t)(uintptr_t)t) - return (1); - - return (0); -} |
