1219820Sjeff/*- 2219820Sjeff * Copyright (c) 2010 Isilon Systems, Inc. 3219820Sjeff * Copyright (c) 2010 iX Systems, Inc. 4219820Sjeff * Copyright (c) 2010 Panasas, Inc. 5219820Sjeff * All rights reserved. 6219820Sjeff * 7219820Sjeff * Redistribution and use in source and binary forms, with or without 8219820Sjeff * modification, are permitted provided that the following conditions 9219820Sjeff * are met: 10219820Sjeff * 1. Redistributions of source code must retain the above copyright 11219820Sjeff * notice unmodified, this list of conditions, and the following 12219820Sjeff * disclaimer. 13219820Sjeff * 2. Redistributions in binary form must reproduce the above copyright 14219820Sjeff * notice, this list of conditions and the following disclaimer in the 15219820Sjeff * documentation and/or other materials provided with the distribution. 16219820Sjeff * 17219820Sjeff * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18219820Sjeff * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19219820Sjeff * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20219820Sjeff * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21219820Sjeff * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22219820Sjeff * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23219820Sjeff * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24219820Sjeff * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25219820Sjeff * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26219820Sjeff * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27219820Sjeff */ 28219820Sjeff#ifndef _LINUX_KTHREAD_H_ 29219820Sjeff#define _LINUX_KTHREAD_H_ 30219820Sjeff 31219820Sjeff#include <sys/param.h> 32219820Sjeff#include <sys/lock.h> 33219820Sjeff#include <sys/mutex.h> 34219820Sjeff#include <sys/kernel.h> 35219820Sjeff#include <sys/kthread.h> 36219820Sjeff#include <sys/sleepqueue.h> 37219820Sjeff 38219820Sjeff#include <linux/slab.h> 39219820Sjeff#include <linux/sched.h> 40219820Sjeff 41219820Sjeffstatic inline void 42219820Sjeff_kthread_fn(void *arg) 43219820Sjeff{ 44219820Sjeff struct task_struct *task; 45219820Sjeff 46219820Sjeff task = arg; 47219820Sjeff task_struct_set(curthread, task); 48219820Sjeff if (task->should_stop == 0) 49219820Sjeff task->task_ret = task->task_fn(task->task_data); 50219820Sjeff PROC_LOCK(task->task_thread->td_proc); 51219820Sjeff task->should_stop = TASK_STOPPED; 52219820Sjeff wakeup(task); 53219820Sjeff PROC_UNLOCK(task->task_thread->td_proc); 54219820Sjeff kthread_exit(); 55219820Sjeff} 56219820Sjeff 57219820Sjeffstatic inline struct task_struct * 58219820Sjeff_kthread_create(int (*threadfn)(void *data), void *data) 59219820Sjeff{ 60219820Sjeff struct task_struct *task; 61219820Sjeff 62219820Sjeff task = kzalloc(sizeof(*task), GFP_KERNEL); 63219820Sjeff task->task_fn = threadfn; 64219820Sjeff task->task_data = data; 65219820Sjeff 66219820Sjeff return (task); 67219820Sjeff} 68219820Sjeff 69219820Sjeffstruct task_struct *kthread_create(int (*threadfn)(void *data), 70219820Sjeff void *data, 71219820Sjeff const char namefmt[], ...) 72219820Sjeff __attribute__((format(printf, 3, 4))); 73219820Sjeff 74219820Sjeff#define kthread_run(fn, data, fmt, ...) \ 75219820Sjeff({ \ 76219820Sjeff struct task_struct *_task; \ 77219820Sjeff \ 78219820Sjeff _task = _kthread_create((fn), (data)); \ 79219820Sjeff if (kthread_add(_kthread_fn, _task, NULL, &_task->task_thread, \ 80219820Sjeff 0, 0, fmt, ## __VA_ARGS__)) { \ 81219820Sjeff kfree(_task); \ 82219820Sjeff _task = NULL; \ 83219820Sjeff } else \ 84219820Sjeff task_struct_set(_task->task_thread, _task); \ 85219820Sjeff _task; \ 86219820Sjeff}) 87219820Sjeff 88219820Sjeff#define kthread_should_stop() current->should_stop 89219820Sjeff 90219820Sjeffstatic inline int 91219820Sjeffkthread_stop(struct task_struct *task) 92219820Sjeff{ 93219820Sjeff 94219820Sjeff PROC_LOCK(task->task_thread->td_proc); 95219820Sjeff task->should_stop = TASK_SHOULD_STOP; 96219820Sjeff wake_up_process(task); 97219820Sjeff while (task->should_stop != TASK_STOPPED) 98219820Sjeff msleep(task, &task->task_thread->td_proc->p_mtx, PWAIT, 99219820Sjeff "kstop", hz); 100219820Sjeff PROC_UNLOCK(task->task_thread->td_proc); 101219820Sjeff return task->task_ret; 102219820Sjeff} 103219820Sjeff 104219820Sjeff#endif /* _LINUX_KTHREAD_H_ */ 105