The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/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/8.1/sys/sys/taskqueue.h 199583 2009-11-20 15:27:52Z jhb $
   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 
   39 struct taskqueue;
   40 struct thread;
   41 
   42 /*
   43  * A notification callback function which is called from
   44  * taskqueue_enqueue().  The context argument is given in the call to
   45  * taskqueue_create().  This function would normally be used to allow the
   46  * queue to arrange to run itself later (e.g., by scheduling a software
   47  * interrupt or waking a kernel thread).
   48  */
   49 typedef void (*taskqueue_enqueue_fn)(void *context);
   50 
   51 struct taskqueue *taskqueue_create(const char *name, int mflags,
   52                                     taskqueue_enqueue_fn enqueue,
   53                                     void *context);
   54 int     taskqueue_start_threads(struct taskqueue **tqp, int count, int pri,
   55                                 const char *name, ...) __printflike(4, 5);
   56 int     taskqueue_enqueue(struct taskqueue *queue, struct task *task);
   57 void    taskqueue_drain(struct taskqueue *queue, struct task *task);
   58 void    taskqueue_free(struct taskqueue *queue);
   59 void    taskqueue_run(struct taskqueue *queue);
   60 void    taskqueue_block(struct taskqueue *queue);
   61 void    taskqueue_unblock(struct taskqueue *queue);
   62 int     taskqueue_member(struct taskqueue *queue, struct thread *td);
   63 
   64 /*
   65  * Functions for dedicated thread taskqueues
   66  */
   67 void    taskqueue_thread_loop(void *arg);
   68 void    taskqueue_thread_enqueue(void *context);
   69 
   70 /*
   71  * Initialise a task structure.
   72  */
   73 #define TASK_INIT(task, priority, func, context) do {   \
   74         (task)->ta_pending = 0;                         \
   75         (task)->ta_priority = (priority);               \
   76         (task)->ta_func = (func);                       \
   77         (task)->ta_context = (context);                 \
   78 } while (0)
   79 
   80 /*
   81  * Declare a reference to a taskqueue.
   82  */
   83 #define TASKQUEUE_DECLARE(name)                 \
   84 extern struct taskqueue *taskqueue_##name
   85 
   86 /*
   87  * Define and initialise a global taskqueue that uses sleep mutexes.
   88  */
   89 #define TASKQUEUE_DEFINE(name, enqueue, context, init)                  \
   90                                                                         \
   91 struct taskqueue *taskqueue_##name;                                     \
   92                                                                         \
   93 static void                                                             \
   94 taskqueue_define_##name(void *arg)                                      \
   95 {                                                                       \
   96         taskqueue_##name =                                              \
   97             taskqueue_create(#name, M_NOWAIT, (enqueue), (context));    \
   98         init;                                                           \
   99 }                                                                       \
  100                                                                         \
  101 SYSINIT(taskqueue_##name, SI_SUB_CONFIGURE, SI_ORDER_SECOND,            \
  102         taskqueue_define_##name, NULL);                                 \
  103                                                                         \
  104 struct __hack
  105 #define TASKQUEUE_DEFINE_THREAD(name)                                   \
  106 TASKQUEUE_DEFINE(name, taskqueue_thread_enqueue, &taskqueue_##name,     \
  107         taskqueue_start_threads(&taskqueue_##name, 1, PWAIT,            \
  108         "%s taskq", #name))
  109 
  110 /*
  111  * Define and initialise a global taskqueue that uses spin mutexes.
  112  */
  113 #define TASKQUEUE_FAST_DEFINE(name, enqueue, context, init)             \
  114                                                                         \
  115 struct taskqueue *taskqueue_##name;                                     \
  116                                                                         \
  117 static void                                                             \
  118 taskqueue_define_##name(void *arg)                                      \
  119 {                                                                       \
  120         taskqueue_##name =                                              \
  121             taskqueue_create_fast(#name, M_NOWAIT, (enqueue),           \
  122             (context));                                                 \
  123         init;                                                           \
  124 }                                                                       \
  125                                                                         \
  126 SYSINIT(taskqueue_##name, SI_SUB_CONFIGURE, SI_ORDER_SECOND,            \
  127         taskqueue_define_##name, NULL);                                 \
  128                                                                         \
  129 struct __hack
  130 #define TASKQUEUE_FAST_DEFINE_THREAD(name)                              \
  131 TASKQUEUE_FAST_DEFINE(name, taskqueue_thread_enqueue,                   \
  132         &taskqueue_##name, taskqueue_start_threads(&taskqueue_##name    \
  133         1, PWAIT, "%s taskq", #name))
  134 
  135 /*
  136  * These queues are serviced by software interrupt handlers.  To enqueue
  137  * a task, call taskqueue_enqueue(taskqueue_swi, &task) or
  138  * taskqueue_enqueue(taskqueue_swi_giant, &task).
  139  */
  140 TASKQUEUE_DECLARE(swi_giant);
  141 TASKQUEUE_DECLARE(swi);
  142 
  143 /*
  144  * This queue is serviced by a kernel thread.  To enqueue a task, call
  145  * taskqueue_enqueue(taskqueue_thread, &task).
  146  */
  147 TASKQUEUE_DECLARE(thread);
  148 
  149 /*
  150  * Queue for swi handlers dispatched from fast interrupt handlers.
  151  * These are necessarily different from the above because the queue
  152  * must be locked with spinlocks since sleep mutex's cannot be used
  153  * from a fast interrupt handler context.
  154  */
  155 TASKQUEUE_DECLARE(fast);
  156 int     taskqueue_enqueue_fast(struct taskqueue *queue, struct task *task);
  157 struct taskqueue *taskqueue_create_fast(const char *name, int mflags,
  158                                     taskqueue_enqueue_fn enqueue,
  159                                     void *context);
  160 
  161 #endif /* !_SYS_TASKQUEUE_H_ */

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