sys/ofed/include/linux/kthread.h

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