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/_task.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/11.1/sys/sys/_task.h 304704 2016-08-23 21:21:56Z shurd $
   27  */
   28 
   29 #ifndef _SYS__TASK_H_
   30 #define _SYS__TASK_H_
   31 
   32 #include <sys/queue.h>
   33 
   34 /*
   35  * Each task includes a function which is called from
   36  * taskqueue_run().  The first argument is taken from the 'ta_context'
   37  * field of struct task and the second argument is a count of how many
   38  * times the task was enqueued before the call to taskqueue_run().
   39  *
   40  * List of locks         
   41  * (c)  const after init         
   42  * (q)  taskqueue lock
   43  */
   44 typedef void task_fn_t(void *context, int pending);
   45 typedef void gtask_fn_t(void *context);
   46 
   47 struct task {
   48         STAILQ_ENTRY(task) ta_link;     /* (q) link for queue */
   49         uint16_t ta_pending;            /* (q) count times queued */
   50         u_short ta_priority;            /* (c) Priority */
   51         task_fn_t *ta_func;             /* (c) task handler */
   52         void    *ta_context;            /* (c) argument for handler */
   53 };
   54 
   55 struct gtask {
   56         STAILQ_ENTRY(gtask) ta_link;    /* (q) link for queue */
   57         uint16_t ta_flags;              /* (q) state flags */
   58         u_short ta_priority;            /* (c) Priority */
   59         gtask_fn_t *ta_func;            /* (c) task handler */
   60         void    *ta_context;            /* (c) argument for handler */
   61 };
   62 
   63 struct grouptask {
   64         struct  gtask           gt_task;
   65         void                    *gt_taskqueue;
   66         LIST_ENTRY(grouptask)   gt_list;
   67         void                    *gt_uniq;
   68         char                    *gt_name;
   69         int16_t                 gt_irq;
   70         int16_t                 gt_cpu;
   71 };
   72 
   73 #endif /* !_SYS__TASK_H_ */

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