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/5.1/sys/sys/taskqueue.h 111528 2003-02-26 03:15:42Z scottl $
   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 
   38 struct taskqueue;
   39 
   40 /*
   41  * Each task includes a function which is called from
   42  * taskqueue_run().  The first argument is taken from the 'ta_context'
   43  * field of struct task and the second argument is a count of how many
   44  * times the task was enqueued before the call to taskqueue_run().
   45  */
   46 typedef void task_fn_t(void *context, int pending);
   47 
   48 /*
   49  * A notification callback function which is called from
   50  * taskqueue_enqueue().  The context argument is given in the call to
   51  * taskqueue_create().  This function would normally be used to allow the
   52  * queue to arrange to run itself later (e.g., by scheduling a software
   53  * interrupt or waking a kernel thread).
   54  */
   55 typedef void (*taskqueue_enqueue_fn)(void *context);
   56 
   57 struct task {
   58         STAILQ_ENTRY(task) ta_link;     /* link for queue */
   59         int     ta_pending;             /* count times queued */
   60         int     ta_priority;            /* priority of task in queue */
   61         task_fn_t *ta_func;             /* task handler */
   62         void    *ta_context;            /* argument for handler */
   63 };
   64 
   65 struct taskqueue *taskqueue_create(const char *name, int mflags,
   66                                     taskqueue_enqueue_fn enqueue,
   67                                     void *context);
   68 int     taskqueue_enqueue(struct taskqueue *queue, struct task *task);
   69 struct taskqueue *taskqueue_find(const char *name);
   70 void    taskqueue_free(struct taskqueue *queue);
   71 void    taskqueue_run(struct taskqueue *queue);
   72 
   73 /*
   74  * Initialise a task structure.
   75  */
   76 #define TASK_INIT(task, priority, func, context) do {   \
   77         (task)->ta_pending = 0;                         \
   78         (task)->ta_priority = (priority);               \
   79         (task)->ta_func = (func);                       \
   80         (task)->ta_context = (context);                 \
   81 } while (0)
   82 
   83 /*
   84  * Declare a reference to a taskqueue.
   85  */
   86 #define TASKQUEUE_DECLARE(name)                 \
   87 extern struct taskqueue *taskqueue_##name
   88 
   89 /*
   90  * Define and initialise a taskqueue.
   91  */
   92 #define TASKQUEUE_DEFINE(name, enqueue, context, init)                  \
   93                                                                         \
   94 struct taskqueue *taskqueue_##name;                                     \
   95                                                                         \
   96 static void                                                             \
   97 taskqueue_define_##name(void *arg)                                      \
   98 {                                                                       \
   99         taskqueue_##name =                                              \
  100             taskqueue_create(#name, M_NOWAIT, (enqueue), (context));    \
  101         init;                                                           \
  102 }                                                                       \
  103                                                                         \
  104 SYSINIT(taskqueue_##name, SI_SUB_CONFIGURE, SI_ORDER_SECOND,            \
  105         taskqueue_define_##name, NULL)                                  \
  106                                                                         \
  107 struct __hack
  108 
  109 /*
  110  * This queue is serviced by a software interrupt handler.  To enqueue
  111  * a task, call taskqueue_enqueue(taskqueue_swi, &task).
  112  */
  113 TASKQUEUE_DECLARE(swi_giant);
  114 TASKQUEUE_DECLARE(swi);
  115 
  116 #endif /* !_SYS_TASKQUEUE_H_ */

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