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 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 * 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 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