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: src/sys/sys/taskqueue.h,v 1.11 2004/08/08 02:37:22 jmg Exp $
   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 
   41 /*
   42  * A notification callback function which is called from
   43  * taskqueue_enqueue().  The context argument is given in the call to
   44  * taskqueue_create().  This function would normally be used to allow the
   45  * queue to arrange to run itself later (e.g., by scheduling a software
   46  * interrupt or waking a kernel thread).
   47  */
   48 typedef void (*taskqueue_enqueue_fn)(void *context);
   49 
   50 struct taskqueue *taskqueue_create(const char *name, int mflags,
   51                                     taskqueue_enqueue_fn enqueue,
   52                                     void *context);
   53 int     taskqueue_enqueue(struct taskqueue *queue, struct task *task);
   54 struct taskqueue *taskqueue_find(const char *name);
   55 void    taskqueue_free(struct taskqueue *queue);
   56 void    taskqueue_run(struct taskqueue *queue);
   57 
   58 /*
   59  * Functions for dedicated thread taskqueues
   60  */
   61 void    taskqueue_thread_loop(void *arg);
   62 void    taskqueue_thread_enqueue(void *context);
   63 
   64 /*
   65  * Initialise a task structure.
   66  */
   67 #define TASK_INIT(task, priority, func, context) do {   \
   68         (task)->ta_pending = 0;                         \
   69         (task)->ta_priority = (priority);               \
   70         (task)->ta_func = (func);                       \
   71         (task)->ta_context = (context);                 \
   72 } while (0)
   73 
   74 /*
   75  * Declare a reference to a taskqueue.
   76  */
   77 #define TASKQUEUE_DECLARE(name)                 \
   78 extern struct taskqueue *taskqueue_##name
   79 
   80 /*
   81  * Define and initialise a taskqueue.
   82  */
   83 #define TASKQUEUE_DEFINE(name, enqueue, context, init)                  \
   84                                                                         \
   85 struct taskqueue *taskqueue_##name;                                     \
   86                                                                         \
   87 static void                                                             \
   88 taskqueue_define_##name(void *arg)                                      \
   89 {                                                                       \
   90         taskqueue_##name =                                              \
   91             taskqueue_create(#name, M_NOWAIT, (enqueue), (context));    \
   92         init;                                                           \
   93 }                                                                       \
   94                                                                         \
   95 SYSINIT(taskqueue_##name, SI_SUB_CONFIGURE, SI_ORDER_SECOND,            \
   96         taskqueue_define_##name, NULL)                                  \
   97                                                                         \
   98 struct __hack
   99 #define TASKQUEUE_DEFINE_THREAD(name)                                   \
  100 static struct proc *taskqueue_##name##_proc;                            \
  101 TASKQUEUE_DEFINE(name, taskqueue_thread_enqueue, &taskqueue_##name,     \
  102         kthread_create(taskqueue_thread_loop, &taskqueue_##name,        \
  103         &taskqueue_##name##_proc, 0, 0, #name " taskq"))
  104 
  105 /*
  106  * These queues are serviced by software interrupt handlers.  To enqueue
  107  * a task, call taskqueue_enqueue(taskqueue_swi, &task) or
  108  * taskqueue_enqueue(taskqueue_swi_giant, &task).
  109  */
  110 TASKQUEUE_DECLARE(swi_giant);
  111 TASKQUEUE_DECLARE(swi);
  112 
  113 /*
  114  * This queue is serviced by a kernel thread.  To enqueue a task, call
  115  * taskqueue_enqueue(taskqueue_thread, &task).
  116  */
  117 TASKQUEUE_DECLARE(thread);
  118 
  119 /*
  120  * Queue for swi handlers dispatched from fast interrupt handlers.
  121  * These are necessarily different from the above because the queue
  122  * must be locked with spinlocks since sleep mutex's cannot be used
  123  * from a fast interrupt handler context.
  124  */
  125 TASKQUEUE_DECLARE(fast);
  126 int     taskqueue_enqueue_fast(struct taskqueue *queue, struct task *task);
  127 
  128 #endif /* !_SYS_TASKQUEUE_H_ */

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