taskqueue.h

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    1 /*-
    2  * Copyright (c) 2000 Doug Rabson
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD$
   27  */
   28 
   29 #ifndef _SYS_TASKQUEUE_H_
   30 #define _SYS_TASKQUEUE_H_
   31 
   32 #ifndef _KERNEL
   33 #error "no user-servicable parts inside"
   34 #endif
   35 
   36 #include <sys/queue.h>
   37 #include <sys/_task.h>
   38 #include <sys/_callout.h>
   39 #include <sys/_cpuset.h>
   40 
   41 struct taskqueue;
   42 struct taskqgroup;
   43 struct thread;
   44 
   45 struct timeout_task {
   46         struct taskqueue *q;
   47         struct task t;
   48         struct callout c;
   49         int    f;
   50 };
   51 
   52 enum taskqueue_callback_type {
   53         TASKQUEUE_CALLBACK_TYPE_INIT,
   54         TASKQUEUE_CALLBACK_TYPE_SHUTDOWN,
   55 };
   56 #define TASKQUEUE_CALLBACK_TYPE_MIN     TASKQUEUE_CALLBACK_TYPE_INIT
   57 #define TASKQUEUE_CALLBACK_TYPE_MAX     TASKQUEUE_CALLBACK_TYPE_SHUTDOWN
   58 #define TASKQUEUE_NUM_CALLBACKS         TASKQUEUE_CALLBACK_TYPE_MAX + 1
   59 #define TASKQUEUE_NAMELEN               32
   60 
   61 typedef void (*taskqueue_callback_fn)(void *context);
   62 
   63 /*
   64  * A notification callback function which is called from
   65  * taskqueue_enqueue().  The context argument is given in the call to
   66  * taskqueue_create().  This function would normally be used to allow the
   67  * queue to arrange to run itself later (e.g., by scheduling a software
   68  * interrupt or waking a kernel thread).
   69  */
   70 typedef void (*taskqueue_enqueue_fn)(void *context);
   71 
   72 struct taskqueue *taskqueue_create(const char *name, int mflags,
   73                                     taskqueue_enqueue_fn enqueue,
   74                                     void *context);
   75 int     taskqueue_start_threads(struct taskqueue **tqp, int count, int pri,
   76                                 const char *name, ...) __printflike(4, 5);
   77 int     taskqueue_start_threads_cpuset(struct taskqueue **tqp, int count,
   78             int pri, cpuset_t *mask, const char *name, ...) __printflike(5, 6);
   79 int     taskqueue_enqueue(struct taskqueue *queue, struct task *task);
   80 int     taskqueue_enqueue_timeout(struct taskqueue *queue,
   81             struct timeout_task *timeout_task, int ticks);
   82 int     taskqueue_enqueue_timeout_sbt(struct taskqueue *queue,
   83             struct timeout_task *timeout_task, sbintime_t sbt, sbintime_t pr,
   84             int flags);
   85 int     taskqueue_poll_is_busy(struct taskqueue *queue, struct task *task);
   86 int     taskqueue_cancel(struct taskqueue *queue, struct task *task,
   87             u_int *pendp);
   88 int     taskqueue_cancel_timeout(struct taskqueue *queue,
   89             struct timeout_task *timeout_task, u_int *pendp);
   90 void    taskqueue_drain(struct taskqueue *queue, struct task *task);
   91 void    taskqueue_drain_timeout(struct taskqueue *queue,
   92             struct timeout_task *timeout_task);
   93 void    taskqueue_drain_all(struct taskqueue *queue);
   94 void    taskqueue_quiesce(struct taskqueue *queue);
   95 void    taskqueue_free(struct taskqueue *queue);
   96 void    taskqueue_run(struct taskqueue *queue);
   97 void    taskqueue_block(struct taskqueue *queue);
   98 void    taskqueue_unblock(struct taskqueue *queue);
   99 int     taskqueue_member(struct taskqueue *queue, struct thread *td);
  100 void    taskqueue_set_callback(struct taskqueue *queue,
  101             enum taskqueue_callback_type cb_type,
  102             taskqueue_callback_fn callback, void *context);
  103 
  104 #define TASK_INITIALIZER(priority, func, context)       \
  105         { .ta_pending = 0,                              \
  106           .ta_priority = (priority),                    \
  107           .ta_func = (func),                            \
  108           .ta_context = (context) }
  109 
  110 /*
  111  * Functions for dedicated thread taskqueues
  112  */
  113 void    taskqueue_thread_loop(void *arg);
  114 void    taskqueue_thread_enqueue(void *context);
  115 
  116 /*
  117  * Initialise a task structure.
  118  */
  119 #define TASK_INIT(task, priority, func, context) do {   \
  120         (task)->ta_pending = 0;                         \
  121         (task)->ta_priority = (priority);               \
  122         (task)->ta_func = (func);                       \
  123         (task)->ta_context = (context);                 \
  124 } while (0)
  125 
  126 void _timeout_task_init(struct taskqueue *queue,
  127             struct timeout_task *timeout_task, int priority, task_fn_t func,
  128             void *context);
  129 #define TIMEOUT_TASK_INIT(queue, timeout_task, priority, func, context) \
  130         _timeout_task_init(queue, timeout_task, priority, func, context);
  131 
  132 /*
  133  * Declare a reference to a taskqueue.
  134  */
  135 #define TASKQUEUE_DECLARE(name)                 \
  136 extern struct taskqueue *taskqueue_##name
  137 
  138 /*
  139  * Define and initialise a global taskqueue that uses sleep mutexes.
  140  */
  141 #define TASKQUEUE_DEFINE(name, enqueue, context, init)                  \
  142                                                                         \
  143 struct taskqueue *taskqueue_##name;                                     \
  144                                                                         \
  145 static void                                                             \
  146 taskqueue_define_##name(void *arg)                                      \
  147 {                                                                       \
  148         taskqueue_##name =                                              \
  149             taskqueue_create(#name, M_WAITOK, (enqueue), (context));    \
  150         init;                                                           \
  151 }                                                                       \
  152                                                                         \
  153 SYSINIT(taskqueue_##name, SI_SUB_TASKQ, SI_ORDER_SECOND,                \
  154         taskqueue_define_##name, NULL);                                 \
  155                                                                         \
  156 struct __hack
  157 #define TASKQUEUE_DEFINE_THREAD(name)                                   \
  158 TASKQUEUE_DEFINE(name, taskqueue_thread_enqueue, &taskqueue_##name,     \
  159         taskqueue_start_threads(&taskqueue_##name, 1, PWAIT,            \
  160         "%s taskq", #name))
  161 
  162 /*
  163  * Define and initialise a global taskqueue that uses spin mutexes.
  164  */
  165 #define TASKQUEUE_FAST_DEFINE(name, enqueue, context, init)             \
  166                                                                         \
  167 struct taskqueue *taskqueue_##name;                                     \
  168                                                                         \
  169 static void                                                             \
  170 taskqueue_define_##name(void *arg)                                      \
  171 {                                                                       \
  172         taskqueue_##name =                                              \
  173             taskqueue_create_fast(#name, M_WAITOK, (enqueue),           \
  174             (context));                                                 \
  175         init;                                                           \
  176 }                                                                       \
  177                                                                         \
  178 SYSINIT(taskqueue_##name, SI_SUB_TASKQ, SI_ORDER_SECOND,                \
  179         taskqueue_define_##name, NULL);                                 \
  180                                                                         \
  181 struct __hack
  182 #define TASKQUEUE_FAST_DEFINE_THREAD(name)                              \
  183 TASKQUEUE_FAST_DEFINE(name, taskqueue_thread_enqueue,                   \
  184         &taskqueue_##name, taskqueue_start_threads(&taskqueue_##name,   \
  185         1, PWAIT, "%s taskq", #name))
  186 
  187 /*
  188  * These queues are serviced by software interrupt handlers.  To enqueue
  189  * a task, call taskqueue_enqueue(taskqueue_swi, &task) or
  190  * taskqueue_enqueue(taskqueue_swi_giant, &task).
  191  */
  192 TASKQUEUE_DECLARE(swi_giant);
  193 TASKQUEUE_DECLARE(swi);
  194 
  195 /*
  196  * This queue is serviced by a kernel thread.  To enqueue a task, call
  197  * taskqueue_enqueue(taskqueue_thread, &task).
  198  */
  199 TASKQUEUE_DECLARE(thread);
  200 
  201 /*
  202  * Queue for swi handlers dispatched from fast interrupt handlers.
  203  * These are necessarily different from the above because the queue
  204  * must be locked with spinlocks since sleep mutex's cannot be used
  205  * from a fast interrupt handler context.
  206  */
  207 TASKQUEUE_DECLARE(fast);
  208 struct taskqueue *taskqueue_create_fast(const char *name, int mflags,
  209                                     taskqueue_enqueue_fn enqueue,
  210                                     void *context);
  211 
  212 #endif /* !_SYS_TASKQUEUE_H_ */

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FreeBSD/Linux Kernel Cross Reference sys/sys/taskqueue.h

FreeBSD/Linux Kernel Cross Reference
sys/sys/taskqueue.h