14889b4229
running, or returns. The calling program is responsible for making sure that nothing new is enqueued. # man page coming soon.
388 lines
9.2 KiB
C
388 lines
9.2 KiB
C
/*-
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* Copyright (c) 2000 Doug Rabson
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/interrupt.h>
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#include <sys/kernel.h>
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#include <sys/kthread.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mutex.h>
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#include <sys/taskqueue.h>
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#include <sys/unistd.h>
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static MALLOC_DEFINE(M_TASKQUEUE, "taskqueue", "Task Queues");
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static void *taskqueue_giant_ih;
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static void *taskqueue_ih;
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static STAILQ_HEAD(taskqueue_list, taskqueue) taskqueue_queues;
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static struct mtx taskqueue_queues_mutex;
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struct taskqueue {
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STAILQ_ENTRY(taskqueue) tq_link;
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STAILQ_HEAD(, task) tq_queue;
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const char *tq_name;
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taskqueue_enqueue_fn tq_enqueue;
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void *tq_context;
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struct mtx tq_mutex;
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};
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static void init_taskqueue_list(void *data);
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static void
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init_taskqueue_list(void *data __unused)
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{
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mtx_init(&taskqueue_queues_mutex, "taskqueue list", NULL, MTX_DEF);
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STAILQ_INIT(&taskqueue_queues);
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}
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SYSINIT(taskqueue_list, SI_SUB_INTRINSIC, SI_ORDER_ANY, init_taskqueue_list,
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NULL);
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struct taskqueue *
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taskqueue_create(const char *name, int mflags,
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taskqueue_enqueue_fn enqueue, void *context)
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{
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struct taskqueue *queue;
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queue = malloc(sizeof(struct taskqueue), M_TASKQUEUE, mflags | M_ZERO);
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if (!queue)
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return 0;
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STAILQ_INIT(&queue->tq_queue);
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queue->tq_name = name;
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queue->tq_enqueue = enqueue;
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queue->tq_context = context;
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mtx_init(&queue->tq_mutex, "taskqueue", NULL, MTX_DEF);
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mtx_lock(&taskqueue_queues_mutex);
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STAILQ_INSERT_TAIL(&taskqueue_queues, queue, tq_link);
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mtx_unlock(&taskqueue_queues_mutex);
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return queue;
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}
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void
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taskqueue_free(struct taskqueue *queue)
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{
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mtx_lock(&taskqueue_queues_mutex);
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STAILQ_REMOVE(&taskqueue_queues, queue, taskqueue, tq_link);
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mtx_unlock(&taskqueue_queues_mutex);
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mtx_lock(&queue->tq_mutex);
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taskqueue_run(queue);
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mtx_destroy(&queue->tq_mutex);
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free(queue, M_TASKQUEUE);
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}
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/*
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* Returns with the taskqueue locked.
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*/
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struct taskqueue *
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taskqueue_find(const char *name)
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{
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struct taskqueue *queue;
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mtx_lock(&taskqueue_queues_mutex);
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STAILQ_FOREACH(queue, &taskqueue_queues, tq_link) {
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if (strcmp(queue->tq_name, name) == 0) {
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mtx_lock(&queue->tq_mutex);
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mtx_unlock(&taskqueue_queues_mutex);
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return queue;
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}
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}
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mtx_unlock(&taskqueue_queues_mutex);
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return NULL;
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}
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int
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taskqueue_enqueue(struct taskqueue *queue, struct task *task)
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{
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struct task *ins;
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struct task *prev;
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mtx_lock(&queue->tq_mutex);
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/*
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* Count multiple enqueues.
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*/
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if (task->ta_pending) {
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task->ta_pending++;
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mtx_unlock(&queue->tq_mutex);
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return 0;
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}
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/*
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* Optimise the case when all tasks have the same priority.
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*/
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prev = STAILQ_LAST(&queue->tq_queue, task, ta_link);
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if (!prev || prev->ta_priority >= task->ta_priority) {
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STAILQ_INSERT_TAIL(&queue->tq_queue, task, ta_link);
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} else {
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prev = 0;
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for (ins = STAILQ_FIRST(&queue->tq_queue); ins;
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prev = ins, ins = STAILQ_NEXT(ins, ta_link))
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if (ins->ta_priority < task->ta_priority)
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break;
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if (prev)
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STAILQ_INSERT_AFTER(&queue->tq_queue, prev, task, ta_link);
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else
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STAILQ_INSERT_HEAD(&queue->tq_queue, task, ta_link);
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}
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task->ta_pending = 1;
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if (queue->tq_enqueue)
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queue->tq_enqueue(queue->tq_context);
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mtx_unlock(&queue->tq_mutex);
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return 0;
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}
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void
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taskqueue_run(struct taskqueue *queue)
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{
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struct task *task;
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int owned, pending;
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owned = mtx_owned(&queue->tq_mutex);
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if (!owned)
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mtx_lock(&queue->tq_mutex);
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while (STAILQ_FIRST(&queue->tq_queue)) {
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/*
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* Carefully remove the first task from the queue and
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* zero its pending count.
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*/
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task = STAILQ_FIRST(&queue->tq_queue);
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STAILQ_REMOVE_HEAD(&queue->tq_queue, ta_link);
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pending = task->ta_pending;
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task->ta_pending = 0;
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task->ta_flags |= TAF_PENDING;
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mtx_unlock(&queue->tq_mutex);
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task->ta_func(task->ta_context, pending);
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mtx_lock(&queue->tq_mutex);
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task->ta_flags &= ~TAF_PENDING;
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wakeup(task);
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}
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/*
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* For compatibility, unlock on return if the queue was not locked
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* on entry, although this opens a race window.
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*/
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if (!owned)
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mtx_unlock(&queue->tq_mutex);
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}
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void
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taskqueue_drain(struct taskqueue *queue, struct task *task)
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{
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WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, "taskqueue_drain");
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mtx_lock(&queue->tq_mutex);
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while (task->ta_pending != 0 || (task->ta_flags & TAF_PENDING)) {
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msleep(task, &queue->tq_mutex, PWAIT, "-", 0);
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}
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mtx_unlock(&queue->tq_mutex);
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}
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static void
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taskqueue_swi_enqueue(void *context)
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{
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swi_sched(taskqueue_ih, 0);
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}
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static void
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taskqueue_swi_run(void *dummy)
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{
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taskqueue_run(taskqueue_swi);
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}
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static void
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taskqueue_swi_giant_enqueue(void *context)
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{
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swi_sched(taskqueue_giant_ih, 0);
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}
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static void
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taskqueue_swi_giant_run(void *dummy)
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{
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taskqueue_run(taskqueue_swi_giant);
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}
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void
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taskqueue_thread_loop(void *arg)
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{
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struct taskqueue **tqp, *tq;
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tqp = arg;
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tq = *tqp;
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mtx_lock(&tq->tq_mutex);
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for (;;) {
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taskqueue_run(tq);
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msleep(tq, &tq->tq_mutex, PWAIT, "-", 0);
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}
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}
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void
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taskqueue_thread_enqueue(void *context)
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{
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struct taskqueue **tqp, *tq;
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tqp = context;
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tq = *tqp;
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mtx_assert(&tq->tq_mutex, MA_OWNED);
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wakeup(tq);
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}
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TASKQUEUE_DEFINE(swi, taskqueue_swi_enqueue, 0,
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swi_add(NULL, "task queue", taskqueue_swi_run, NULL, SWI_TQ,
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INTR_MPSAFE, &taskqueue_ih));
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TASKQUEUE_DEFINE(swi_giant, taskqueue_swi_giant_enqueue, 0,
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swi_add(NULL, "Giant task queue", taskqueue_swi_giant_run,
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NULL, SWI_TQ_GIANT, 0, &taskqueue_giant_ih));
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TASKQUEUE_DEFINE_THREAD(thread);
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int
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taskqueue_enqueue_fast(struct taskqueue *queue, struct task *task)
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{
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struct task *ins;
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struct task *prev;
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mtx_lock_spin(&queue->tq_mutex);
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/*
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* Count multiple enqueues.
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*/
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if (task->ta_pending) {
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task->ta_pending++;
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mtx_unlock_spin(&queue->tq_mutex);
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return 0;
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}
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/*
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* Optimise the case when all tasks have the same priority.
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*/
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prev = STAILQ_LAST(&queue->tq_queue, task, ta_link);
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if (!prev || prev->ta_priority >= task->ta_priority) {
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STAILQ_INSERT_TAIL(&queue->tq_queue, task, ta_link);
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} else {
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prev = 0;
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for (ins = STAILQ_FIRST(&queue->tq_queue); ins;
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prev = ins, ins = STAILQ_NEXT(ins, ta_link))
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if (ins->ta_priority < task->ta_priority)
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break;
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if (prev)
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STAILQ_INSERT_AFTER(&queue->tq_queue, prev, task, ta_link);
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else
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STAILQ_INSERT_HEAD(&queue->tq_queue, task, ta_link);
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}
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task->ta_pending = 1;
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if (queue->tq_enqueue)
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queue->tq_enqueue(queue->tq_context);
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mtx_unlock_spin(&queue->tq_mutex);
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return 0;
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}
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static void
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taskqueue_run_fast(struct taskqueue *queue)
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{
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struct task *task;
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int pending;
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mtx_lock_spin(&queue->tq_mutex);
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while (STAILQ_FIRST(&queue->tq_queue)) {
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/*
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* Carefully remove the first task from the queue and
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* zero its pending count.
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*/
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task = STAILQ_FIRST(&queue->tq_queue);
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STAILQ_REMOVE_HEAD(&queue->tq_queue, ta_link);
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pending = task->ta_pending;
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task->ta_pending = 0;
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mtx_unlock_spin(&queue->tq_mutex);
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task->ta_func(task->ta_context, pending);
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mtx_lock_spin(&queue->tq_mutex);
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}
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mtx_unlock_spin(&queue->tq_mutex);
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}
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struct taskqueue *taskqueue_fast;
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static void *taskqueue_fast_ih;
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static void
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taskqueue_fast_schedule(void *context)
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{
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swi_sched(taskqueue_fast_ih, 0);
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}
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static void
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taskqueue_fast_run(void *dummy)
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{
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taskqueue_run_fast(taskqueue_fast);
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}
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static void
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taskqueue_define_fast(void *arg)
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{
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taskqueue_fast = malloc(sizeof(struct taskqueue), M_TASKQUEUE,
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M_NOWAIT | M_ZERO);
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if (!taskqueue_fast) {
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printf("%s: Unable to allocate fast task queue!\n", __func__);
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return;
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}
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STAILQ_INIT(&taskqueue_fast->tq_queue);
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taskqueue_fast->tq_name = "fast";
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taskqueue_fast->tq_enqueue = taskqueue_fast_schedule;
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mtx_init(&taskqueue_fast->tq_mutex, "taskqueue_fast", NULL, MTX_SPIN);
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mtx_lock(&taskqueue_queues_mutex);
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STAILQ_INSERT_TAIL(&taskqueue_queues, taskqueue_fast, tq_link);
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mtx_unlock(&taskqueue_queues_mutex);
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swi_add(NULL, "Fast task queue", taskqueue_fast_run,
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NULL, SWI_TQ_FAST, 0, &taskqueue_fast_ih);
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}
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SYSINIT(taskqueue_fast, SI_SUB_CONFIGURE, SI_ORDER_SECOND,
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taskqueue_define_fast, NULL);
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