1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
|
/*-
* Copyright (c) 2010 Isilon Systems, Inc.
* Copyright (c) 2010 iX Systems, Inc.
* Copyright (c) 2010 Panasas, Inc.
* Copyright (c) 2013-2017 Mellanox Technologies, Ltd.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice unmodified, this list of conditions, and the following
* disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _LINUXKPI_LINUX_KTHREAD_H_
#define _LINUXKPI_LINUX_KTHREAD_H_
#include <linux/sched.h>
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/kthread.h>
#include <sys/malloc.h>
#include <sys/queue.h>
#include <sys/taskqueue.h>
#include <sys/unistd.h>
struct task_struct;
struct kthread_work;
typedef void (*kthread_work_func_t)(struct kthread_work *work);
struct kthread_worker {
struct task_struct *task;
struct taskqueue *tq;
};
struct kthread_work {
struct taskqueue *tq;
struct task task;
kthread_work_func_t func;
};
#define kthread_run(fn, data, fmt, ...) ({ \
struct task_struct *__task; \
struct thread *__td; \
\
if (kthread_add(linux_kthread_fn, NULL, NULL, &__td, \
RFSTOPPED, 0, fmt, ## __VA_ARGS__)) \
__task = NULL; \
else \
__task = linux_kthread_setup_and_run(__td, fn, data); \
__task; \
})
int linux_kthread_stop(struct task_struct *);
bool linux_kthread_should_stop_task(struct task_struct *);
bool linux_kthread_should_stop(void);
int linux_kthread_park(struct task_struct *);
void linux_kthread_parkme(void);
bool linux_kthread_should_park(void);
void linux_kthread_unpark(struct task_struct *);
void linux_kthread_fn(void *);
struct task_struct *linux_kthread_setup_and_run(struct thread *,
linux_task_fn_t *, void *arg);
int linux_in_atomic(void);
#define kthread_stop(task) linux_kthread_stop(task)
#define kthread_should_stop() linux_kthread_should_stop()
#define kthread_should_stop_task(task) linux_kthread_should_stop_task(task)
#define kthread_park(task) linux_kthread_park(task)
#define kthread_parkme() linux_kthread_parkme()
#define kthread_should_park() linux_kthread_should_park()
#define kthread_unpark(task) linux_kthread_unpark(task)
#define in_atomic() linux_in_atomic()
/* Only kthread_(create|destroy)_worker interface is allowed */
#define kthread_init_worker(worker) \
_Static_assert(false, "pre-4.9 worker interface is not supported");
task_fn_t lkpi_kthread_work_fn;
task_fn_t lkpi_kthread_worker_init_fn;
#define kthread_create_worker(flags, fmt, ...) ({ \
struct kthread_worker *__w; \
struct task __task; \
\
__w = malloc(sizeof(*__w), M_KMALLOC, M_WAITOK | M_ZERO); \
__w->tq = taskqueue_create("lkpi kthread taskq", M_WAITOK, \
taskqueue_thread_enqueue, &__w->tq); \
taskqueue_start_threads(&__w->tq, 1, PWAIT, fmt, ##__VA_ARGS__);\
TASK_INIT(&__task, 0, lkpi_kthread_worker_init_fn, __w); \
taskqueue_enqueue(__w->tq, &__task); \
taskqueue_drain(__w->tq, &__task); \
__w; \
})
static inline void
kthread_destroy_worker(struct kthread_worker *worker)
{
taskqueue_drain_all(worker->tq);
taskqueue_free(worker->tq);
free(worker, M_KMALLOC);
}
static inline void
kthread_init_work(struct kthread_work *work, kthread_work_func_t func)
{
work->tq = NULL;
work->func = func;
TASK_INIT(&work->task, 0, lkpi_kthread_work_fn, work);
}
static inline bool
kthread_queue_work(struct kthread_worker *worker, struct kthread_work *work)
{
int error;
error = taskqueue_enqueue_flags(worker->tq, &work->task,
TASKQUEUE_FAIL_IF_CANCELING | TASKQUEUE_FAIL_IF_PENDING);
if (error == 0)
work->tq = worker->tq;
return (error == 0);
}
static inline bool
kthread_cancel_work_sync(struct kthread_work *work)
{
u_int pending = 0;
if (work->tq != NULL &&
taskqueue_cancel(work->tq, &work->task, &pending) != 0)
taskqueue_drain(work->tq, &work->task);
return (pending != 0);
}
static inline void
kthread_flush_work(struct kthread_work *work)
{
if (work->tq != NULL)
taskqueue_drain(work->tq, &work->task);
}
static inline void
kthread_flush_worker(struct kthread_worker *worker)
{
taskqueue_drain_all(worker->tq);
}
#endif /* _LINUXKPI_LINUX_KTHREAD_H_ */
|
