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: releng/10.3/sys/sys/taskqueue.h 262065 2014-02-17 15:32:08Z avg $
   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 
   40 struct taskqueue;
   41 struct thread;
   42 
   43 struct timeout_task {
   44         struct taskqueue *q;
   45         struct task t;
   46         struct callout c;
   47         int    f;
   48 };
   49 
   50 enum taskqueue_callback_type {
   51         TASKQUEUE_CALLBACK_TYPE_INIT,
   52         TASKQUEUE_CALLBACK_TYPE_SHUTDOWN,
   53 };
   54 #define TASKQUEUE_CALLBACK_TYPE_MIN     TASKQUEUE_CALLBACK_TYPE_INIT
   55 #define TASKQUEUE_CALLBACK_TYPE_MAX     TASKQUEUE_CALLBACK_TYPE_SHUTDOWN
   56 #define TASKQUEUE_NUM_CALLBACKS         TASKQUEUE_CALLBACK_TYPE_MAX + 1
   57 
   58 typedef void (*taskqueue_callback_fn)(void *context);
   59 
   60 /*
   61  * A notification callback function which is called from
   62  * taskqueue_enqueue().  The context argument is given in the call to
   63  * taskqueue_create().  This function would normally be used to allow the
   64  * queue to arrange to run itself later (e.g., by scheduling a software
   65  * interrupt or waking a kernel thread).
   66  */
   67 typedef void (*taskqueue_enqueue_fn)(void *context);
   68 
   69 struct taskqueue *taskqueue_create(const char *name, int mflags,
   70                                     taskqueue_enqueue_fn enqueue,
   71                                     void *context);
   72 int     taskqueue_start_threads(struct taskqueue **tqp, int count, int pri,
   73                                 const char *name, ...) __printflike(4, 5);
   74 int     taskqueue_enqueue(struct taskqueue *queue, struct task *task);
   75 int     taskqueue_enqueue_timeout(struct taskqueue *queue,
   76             struct timeout_task *timeout_task, int ticks);
   77 int     taskqueue_cancel(struct taskqueue *queue, struct task *task,
   78             u_int *pendp);
   79 int     taskqueue_cancel_timeout(struct taskqueue *queue,
   80             struct timeout_task *timeout_task, u_int *pendp);
   81 void    taskqueue_drain(struct taskqueue *queue, struct task *task);
   82 void    taskqueue_drain_timeout(struct taskqueue *queue,
   83             struct timeout_task *timeout_task);
   84 void    taskqueue_drain_all(struct taskqueue *queue);
   85 void    taskqueue_free(struct taskqueue *queue);
   86 void    taskqueue_run(struct taskqueue *queue);
   87 void    taskqueue_block(struct taskqueue *queue);
   88 void    taskqueue_unblock(struct taskqueue *queue);
   89 int     taskqueue_member(struct taskqueue *queue, struct thread *td);
   90 void    taskqueue_set_callback(struct taskqueue *queue,
   91             enum taskqueue_callback_type cb_type,
   92             taskqueue_callback_fn callback, void *context);
   93 
   94 #define TASK_INITIALIZER(priority, func, context)       \
   95         { .ta_pending = 0,                              \
   96           .ta_priority = (priority),                    \
   97           .ta_func = (func),                            \
   98           .ta_context = (context) }
   99 
  100 /*
  101  * Functions for dedicated thread taskqueues
  102  */
  103 void    taskqueue_thread_loop(void *arg);
  104 void    taskqueue_thread_enqueue(void *context);
  105 
  106 /*
  107  * Initialise a task structure.
  108  */
  109 #define TASK_INIT(task, priority, func, context) do {   \
  110         (task)->ta_pending = 0;                         \
  111         (task)->ta_priority = (priority);               \
  112         (task)->ta_func = (func);                       \
  113         (task)->ta_context = (context);                 \
  114 } while (0)
  115 
  116 void _timeout_task_init(struct taskqueue *queue,
  117             struct timeout_task *timeout_task, int priority, task_fn_t func,
  118             void *context);
  119 #define TIMEOUT_TASK_INIT(queue, timeout_task, priority, func, context) \
  120         _timeout_task_init(queue, timeout_task, priority, func, context);
  121 
  122 /*
  123  * Declare a reference to a taskqueue.
  124  */
  125 #define TASKQUEUE_DECLARE(name)                 \
  126 extern struct taskqueue *taskqueue_##name
  127 
  128 /*
  129  * Define and initialise a global taskqueue that uses sleep mutexes.
  130  */
  131 #define TASKQUEUE_DEFINE(name, enqueue, context, init)                  \
  132                                                                         \
  133 struct taskqueue *taskqueue_##name;                                     \
  134                                                                         \
  135 static void                                                             \
  136 taskqueue_define_##name(void *arg)                                      \
  137 {                                                                       \
  138         taskqueue_##name =                                              \
  139             taskqueue_create(#name, M_WAITOK, (enqueue), (context));    \
  140         init;                                                           \
  141 }                                                                       \
  142                                                                         \
  143 SYSINIT(taskqueue_##name, SI_SUB_CONFIGURE, SI_ORDER_SECOND,            \
  144         taskqueue_define_##name, NULL);                                 \
  145                                                                         \
  146 struct __hack
  147 #define TASKQUEUE_DEFINE_THREAD(name)                                   \
  148 TASKQUEUE_DEFINE(name, taskqueue_thread_enqueue, &taskqueue_##name,     \
  149         taskqueue_start_threads(&taskqueue_##name, 1, PWAIT,            \
  150         "%s taskq", #name))
  151 
  152 /*
  153  * Define and initialise a global taskqueue that uses spin mutexes.
  154  */
  155 #define TASKQUEUE_FAST_DEFINE(name, enqueue, context, init)             \
  156                                                                         \
  157 struct taskqueue *taskqueue_##name;                                     \
  158                                                                         \
  159 static void                                                             \
  160 taskqueue_define_##name(void *arg)                                      \
  161 {                                                                       \
  162         taskqueue_##name =                                              \
  163             taskqueue_create_fast(#name, M_WAITOK, (enqueue),           \
  164             (context));                                                 \
  165         init;                                                           \
  166 }                                                                       \
  167                                                                         \
  168 SYSINIT(taskqueue_##name, SI_SUB_CONFIGURE, SI_ORDER_SECOND,            \
  169         taskqueue_define_##name, NULL);                                 \
  170                                                                         \
  171 struct __hack
  172 #define TASKQUEUE_FAST_DEFINE_THREAD(name)                              \
  173 TASKQUEUE_FAST_DEFINE(name, taskqueue_thread_enqueue,                   \
  174         &taskqueue_##name, taskqueue_start_threads(&taskqueue_##name    \
  175         1, PWAIT, "%s taskq", #name))
  176 
  177 /*
  178  * These queues are serviced by software interrupt handlers.  To enqueue
  179  * a task, call taskqueue_enqueue(taskqueue_swi, &task) or
  180  * taskqueue_enqueue(taskqueue_swi_giant, &task).
  181  */
  182 TASKQUEUE_DECLARE(swi_giant);
  183 TASKQUEUE_DECLARE(swi);
  184 
  185 /*
  186  * This queue is serviced by a kernel thread.  To enqueue a task, call
  187  * taskqueue_enqueue(taskqueue_thread, &task).
  188  */
  189 TASKQUEUE_DECLARE(thread);
  190 
  191 /*
  192  * Queue for swi handlers dispatched from fast interrupt handlers.
  193  * These are necessarily different from the above because the queue
  194  * must be locked with spinlocks since sleep mutex's cannot be used
  195  * from a fast interrupt handler context.
  196  */
  197 TASKQUEUE_DECLARE(fast);
  198 int     taskqueue_enqueue_fast(struct taskqueue *queue, struct task *task);
  199 struct taskqueue *taskqueue_create_fast(const char *name, int mflags,
  200                                     taskqueue_enqueue_fn enqueue,
  201                                     void *context);
  202 
  203 #endif /* !_SYS_TASKQUEUE_H_ */

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

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sys/sys/taskqueue.h