FreeBSD/Linux Kernel Cross Reference
sys/sys/taskqueue.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/11.0/sys/sys/taskqueue.h 304716 2016-08-24 01:56:30Z shurd $
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 #include <sys/_callout.h>
39 #include <sys/_cpuset.h>
40
41 struct taskqueue;
42 struct taskqgroup;
43 struct thread;
44
45 struct timeout_task {
46 struct taskqueue *q;
47 struct task t;
48 struct callout c;
49 int f;
50 };
51
52 enum taskqueue_callback_type {
53 TASKQUEUE_CALLBACK_TYPE_INIT,
54 TASKQUEUE_CALLBACK_TYPE_SHUTDOWN,
55 };
56 #define TASKQUEUE_CALLBACK_TYPE_MIN TASKQUEUE_CALLBACK_TYPE_INIT
57 #define TASKQUEUE_CALLBACK_TYPE_MAX TASKQUEUE_CALLBACK_TYPE_SHUTDOWN
58 #define TASKQUEUE_NUM_CALLBACKS TASKQUEUE_CALLBACK_TYPE_MAX + 1
59 #define TASKQUEUE_NAMELEN 32
60
61 typedef void (*taskqueue_callback_fn)(void *context);
62
63 /*
64 * A notification callback function which is called from
65 * taskqueue_enqueue(). The context argument is given in the call to
66 * taskqueue_create(). This function would normally be used to allow the
67 * queue to arrange to run itself later (e.g., by scheduling a software
68 * interrupt or waking a kernel thread).
69 */
70 typedef void (*taskqueue_enqueue_fn)(void *context);
71
72 struct taskqueue *taskqueue_create(const char *name, int mflags,
73 taskqueue_enqueue_fn enqueue,
74 void *context);
75 int taskqueue_start_threads(struct taskqueue **tqp, int count, int pri,
76 const char *name, ...) __printflike(4, 5);
77 int taskqueue_start_threads_cpuset(struct taskqueue **tqp, int count,
78 int pri, cpuset_t *mask, const char *name, ...) __printflike(5, 6);
79 int taskqueue_enqueue(struct taskqueue *queue, struct task *task);
80 int taskqueue_enqueue_timeout(struct taskqueue *queue,
81 struct timeout_task *timeout_task, int ticks);
82 int taskqueue_cancel(struct taskqueue *queue, struct task *task,
83 u_int *pendp);
84 int taskqueue_cancel_timeout(struct taskqueue *queue,
85 struct timeout_task *timeout_task, u_int *pendp);
86 void taskqueue_drain(struct taskqueue *queue, struct task *task);
87 void taskqueue_drain_timeout(struct taskqueue *queue,
88 struct timeout_task *timeout_task);
89 void taskqueue_drain_all(struct taskqueue *queue);
90 void taskqueue_free(struct taskqueue *queue);
91 void taskqueue_run(struct taskqueue *queue);
92 void taskqueue_block(struct taskqueue *queue);
93 void taskqueue_unblock(struct taskqueue *queue);
94 int taskqueue_member(struct taskqueue *queue, struct thread *td);
95 void taskqueue_set_callback(struct taskqueue *queue,
96 enum taskqueue_callback_type cb_type,
97 taskqueue_callback_fn callback, void *context);
98
99 #define TASK_INITIALIZER(priority, func, context) \
100 { .ta_pending = 0, \
101 .ta_priority = (priority), \
102 .ta_func = (func), \
103 .ta_context = (context) }
104
105 /*
106 * Functions for dedicated thread taskqueues
107 */
108 void taskqueue_thread_loop(void *arg);
109 void taskqueue_thread_enqueue(void *context);
110
111 /*
112 * Initialise a task structure.
113 */
114 #define TASK_INIT(task, priority, func, context) do { \
115 (task)->ta_pending = 0; \
116 (task)->ta_priority = (priority); \
117 (task)->ta_func = (func); \
118 (task)->ta_context = (context); \
119 } while (0)
120
121 void _timeout_task_init(struct taskqueue *queue,
122 struct timeout_task *timeout_task, int priority, task_fn_t func,
123 void *context);
124 #define TIMEOUT_TASK_INIT(queue, timeout_task, priority, func, context) \
125 _timeout_task_init(queue, timeout_task, priority, func, context);
126
127 /*
128 * Declare a reference to a taskqueue.
129 */
130 #define TASKQUEUE_DECLARE(name) \
131 extern struct taskqueue *taskqueue_##name
132
133 /*
134 * Define and initialise a global taskqueue that uses sleep mutexes.
135 */
136 #define TASKQUEUE_DEFINE(name, enqueue, context, init) \
137 \
138 struct taskqueue *taskqueue_##name; \
139 \
140 static void \
141 taskqueue_define_##name(void *arg) \
142 { \
143 taskqueue_##name = \
144 taskqueue_create(#name, M_WAITOK, (enqueue), (context)); \
145 init; \
146 } \
147 \
148 SYSINIT(taskqueue_##name, SI_SUB_INIT_IF, SI_ORDER_SECOND, \
149 taskqueue_define_##name, NULL); \
150 \
151 struct __hack
152 #define TASKQUEUE_DEFINE_THREAD(name) \
153 TASKQUEUE_DEFINE(name, taskqueue_thread_enqueue, &taskqueue_##name, \
154 taskqueue_start_threads(&taskqueue_##name, 1, PWAIT, \
155 "%s taskq", #name))
156
157 /*
158 * Define and initialise a global taskqueue that uses spin mutexes.
159 */
160 #define TASKQUEUE_FAST_DEFINE(name, enqueue, context, init) \
161 \
162 struct taskqueue *taskqueue_##name; \
163 \
164 static void \
165 taskqueue_define_##name(void *arg) \
166 { \
167 taskqueue_##name = \
168 taskqueue_create_fast(#name, M_WAITOK, (enqueue), \
169 (context)); \
170 init; \
171 } \
172 \
173 SYSINIT(taskqueue_##name, SI_SUB_INIT_IF, SI_ORDER_SECOND, \
174 taskqueue_define_##name, NULL); \
175 \
176 struct __hack
177 #define TASKQUEUE_FAST_DEFINE_THREAD(name) \
178 TASKQUEUE_FAST_DEFINE(name, taskqueue_thread_enqueue, \
179 &taskqueue_##name, taskqueue_start_threads(&taskqueue_##name \
180 1, PWAIT, "%s taskq", #name))
181
182 /*
183 * These queues are serviced by software interrupt handlers. To enqueue
184 * a task, call taskqueue_enqueue(taskqueue_swi, &task) or
185 * taskqueue_enqueue(taskqueue_swi_giant, &task).
186 */
187 TASKQUEUE_DECLARE(swi_giant);
188 TASKQUEUE_DECLARE(swi);
189
190 /*
191 * This queue is serviced by a kernel thread. To enqueue a task, call
192 * taskqueue_enqueue(taskqueue_thread, &task).
193 */
194 TASKQUEUE_DECLARE(thread);
195
196 /*
197 * Queue for swi handlers dispatched from fast interrupt handlers.
198 * These are necessarily different from the above because the queue
199 * must be locked with spinlocks since sleep mutex's cannot be used
200 * from a fast interrupt handler context.
201 */
202 TASKQUEUE_DECLARE(fast);
203 struct taskqueue *taskqueue_create_fast(const char *name, int mflags,
204 taskqueue_enqueue_fn enqueue,
205 void *context);
206
207 #endif /* !_SYS_TASKQUEUE_H_ */
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