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 * $FreeBSD$
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_enqueue_timeout_sbt(struct taskqueue *queue,
83 struct timeout_task *timeout_task, sbintime_t sbt, sbintime_t pr,
84 int flags);
85 int taskqueue_poll_is_busy(struct taskqueue *queue, struct task *task);
86 int taskqueue_cancel(struct taskqueue *queue, struct task *task,
87 u_int *pendp);
88 int taskqueue_cancel_timeout(struct taskqueue *queue,
89 struct timeout_task *timeout_task, u_int *pendp);
90 void taskqueue_drain(struct taskqueue *queue, struct task *task);
91 void taskqueue_drain_timeout(struct taskqueue *queue,
92 struct timeout_task *timeout_task);
93 void taskqueue_drain_all(struct taskqueue *queue);
94 void taskqueue_quiesce(struct taskqueue *queue);
95 void taskqueue_free(struct taskqueue *queue);
96 void taskqueue_run(struct taskqueue *queue);
97 void taskqueue_block(struct taskqueue *queue);
98 void taskqueue_unblock(struct taskqueue *queue);
99 int taskqueue_member(struct taskqueue *queue, struct thread *td);
100 void taskqueue_set_callback(struct taskqueue *queue,
101 enum taskqueue_callback_type cb_type,
102 taskqueue_callback_fn callback, void *context);
103
104 #define TASK_INITIALIZER(priority, func, context) \
105 { .ta_pending = 0, \
106 .ta_priority = (priority), \
107 .ta_func = (func), \
108 .ta_context = (context) }
109
110 /*
111 * Functions for dedicated thread taskqueues
112 */
113 void taskqueue_thread_loop(void *arg);
114 void taskqueue_thread_enqueue(void *context);
115
116 /*
117 * Initialise a task structure.
118 */
119 #define TASK_INIT(task, priority, func, context) do { \
120 (task)->ta_pending = 0; \
121 (task)->ta_priority = (priority); \
122 (task)->ta_func = (func); \
123 (task)->ta_context = (context); \
124 } while (0)
125
126 void _timeout_task_init(struct taskqueue *queue,
127 struct timeout_task *timeout_task, int priority, task_fn_t func,
128 void *context);
129 #define TIMEOUT_TASK_INIT(queue, timeout_task, priority, func, context) \
130 _timeout_task_init(queue, timeout_task, priority, func, context);
131
132 /*
133 * Declare a reference to a taskqueue.
134 */
135 #define TASKQUEUE_DECLARE(name) \
136 extern struct taskqueue *taskqueue_##name
137
138 /*
139 * Define and initialise a global taskqueue that uses sleep mutexes.
140 */
141 #define TASKQUEUE_DEFINE(name, enqueue, context, init) \
142 \
143 struct taskqueue *taskqueue_##name; \
144 \
145 static void \
146 taskqueue_define_##name(void *arg) \
147 { \
148 taskqueue_##name = \
149 taskqueue_create(#name, M_WAITOK, (enqueue), (context)); \
150 init; \
151 } \
152 \
153 SYSINIT(taskqueue_##name, SI_SUB_TASKQ, SI_ORDER_SECOND, \
154 taskqueue_define_##name, NULL); \
155 \
156 struct __hack
157 #define TASKQUEUE_DEFINE_THREAD(name) \
158 TASKQUEUE_DEFINE(name, taskqueue_thread_enqueue, &taskqueue_##name, \
159 taskqueue_start_threads(&taskqueue_##name, 1, PWAIT, \
160 "%s taskq", #name))
161
162 /*
163 * Define and initialise a global taskqueue that uses spin mutexes.
164 */
165 #define TASKQUEUE_FAST_DEFINE(name, enqueue, context, init) \
166 \
167 struct taskqueue *taskqueue_##name; \
168 \
169 static void \
170 taskqueue_define_##name(void *arg) \
171 { \
172 taskqueue_##name = \
173 taskqueue_create_fast(#name, M_WAITOK, (enqueue), \
174 (context)); \
175 init; \
176 } \
177 \
178 SYSINIT(taskqueue_##name, SI_SUB_TASKQ, SI_ORDER_SECOND, \
179 taskqueue_define_##name, NULL); \
180 \
181 struct __hack
182 #define TASKQUEUE_FAST_DEFINE_THREAD(name) \
183 TASKQUEUE_FAST_DEFINE(name, taskqueue_thread_enqueue, \
184 &taskqueue_##name, taskqueue_start_threads(&taskqueue_##name, \
185 1, PWAIT, "%s taskq", #name))
186
187 /*
188 * These queues are serviced by software interrupt handlers. To enqueue
189 * a task, call taskqueue_enqueue(taskqueue_swi, &task) or
190 * taskqueue_enqueue(taskqueue_swi_giant, &task).
191 */
192 TASKQUEUE_DECLARE(swi_giant);
193 TASKQUEUE_DECLARE(swi);
194
195 /*
196 * This queue is serviced by a kernel thread. To enqueue a task, call
197 * taskqueue_enqueue(taskqueue_thread, &task).
198 */
199 TASKQUEUE_DECLARE(thread);
200
201 /*
202 * Queue for swi handlers dispatched from fast interrupt handlers.
203 * These are necessarily different from the above because the queue
204 * must be locked with spinlocks since sleep mutex's cannot be used
205 * from a fast interrupt handler context.
206 */
207 TASKQUEUE_DECLARE(fast);
208 struct taskqueue *taskqueue_create_fast(const char *name, int mflags,
209 taskqueue_enqueue_fn enqueue,
210 void *context);
211
212 #endif /* !_SYS_TASKQUEUE_H_ */
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