1 /*-
2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice unmodified, this list of conditions, and the following
13 * disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * $FreeBSD$
30 */
31 #ifndef _LINUX_KTHREAD_H_
32 #define _LINUX_KTHREAD_H_
33
34 #include <sys/param.h>
35 #include <sys/lock.h>
36 #include <sys/mutex.h>
37 #include <sys/kernel.h>
38 #include <sys/kthread.h>
39 #include <sys/sleepqueue.h>
40
41 #include <linux/slab.h>
42 #include <linux/sched.h>
43
44 static inline void
linux_kthread_fn(void * arg)45 linux_kthread_fn(void *arg)
46 {
47 struct task_struct *task;
48
49 task = arg;
50 task_struct_set(curthread, task);
51 if (task->should_stop == 0)
52 task->task_ret = task->task_fn(task->task_data);
53 PROC_LOCK(task->task_thread->td_proc);
54 task->should_stop = TASK_STOPPED;
55 wakeup(task);
56 PROC_UNLOCK(task->task_thread->td_proc);
57 kthread_exit();
58 }
59
60 static inline struct task_struct *
linux_kthread_create(int (* threadfn)(void * data),void * data)61 linux_kthread_create(int (*threadfn)(void *data), void *data)
62 {
63 struct task_struct *task;
64
65 task = kzalloc(sizeof(*task), GFP_KERNEL);
66 task->task_fn = threadfn;
67 task->task_data = data;
68
69 return (task);
70 }
71
72 #define kthread_run(fn, data, fmt, ...) \
73 ({ \
74 struct task_struct *_task; \
75 \
76 _task = linux_kthread_create((fn), (data)); \
77 if (kthread_add(linux_kthread_fn, _task, NULL, &_task->task_thread, \
78 0, 0, fmt, ## __VA_ARGS__)) { \
79 kfree(_task); \
80 _task = NULL; \
81 } else \
82 task_struct_set(_task->task_thread, _task); \
83 _task; \
84 })
85
86 #define kthread_should_stop() current->should_stop
87
88 static inline int
kthread_stop(struct task_struct * task)89 kthread_stop(struct task_struct *task)
90 {
91
92 PROC_LOCK(task->task_thread->td_proc);
93 task->should_stop = TASK_SHOULD_STOP;
94 wake_up_process(task);
95 while (task->should_stop != TASK_STOPPED)
96 msleep(task, &task->task_thread->td_proc->p_mtx, PWAIT,
97 "kstop", hz);
98 PROC_UNLOCK(task->task_thread->td_proc);
99 return task->task_ret;
100 }
101
102 #endif /* _LINUX_KTHREAD_H_ */
103