FreeBSD/Linux Kernel Cross Reference
sys/sys/_task.h
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/10.0/sys/sys/_task.h 213813 2010-10-13 22:59:04Z mdf $
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
46 struct task {
47 STAILQ_ENTRY(task) ta_link; /* (q) link for queue */
48 u_short ta_pending; /* (q) count times queued */
49 u_short ta_priority; /* (c) Priority */
50 task_fn_t *ta_func; /* (c) task handler */
51 void *ta_context; /* (c) argument for handler */
52 };
53
54 #endif /* !_SYS__TASK_H_ */
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