1 /*- 2 * Copyright (c) 2010 Isilon Systems, Inc. 3 * Copyright (c) 2010 iX Systems, Inc. 4 * Copyright (c) 2010 Panasas, Inc. 5 * Copyright (c) 2013-2016 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 struct thread *td = curthread; 49 50 task = arg; 51 task_struct_fill(td, task); 52 task_struct_set(td, task); 53 if (task->should_stop == 0) 54 task->task_ret = task->task_fn(task->task_data); 55 PROC_LOCK(td->td_proc); 56 task->should_stop = TASK_STOPPED; 57 wakeup(task); 58 PROC_UNLOCK(td->td_proc); 59 task_struct_set(td, NULL); 60 kthread_exit(); 61 } 62 63 static inline struct task_struct * 64 linux_kthread_create(int (*threadfn)(void *data), void *data) 65 { 66 struct task_struct *task; 67 68 task = kzalloc(sizeof(*task), GFP_KERNEL); 69 task->task_fn = threadfn; 70 task->task_data = data; 71 72 return (task); 73 } 74 75 #define kthread_run(fn, data, fmt, ...) \ 76 ({ \ 77 struct task_struct *_task; \ 78 \ 79 _task = linux_kthread_create((fn), (data)); \ 80 if (kthread_add(linux_kthread_fn, _task, NULL, &_task->task_thread, \ 81 0, 0, fmt, ## __VA_ARGS__)) { \ 82 kfree(_task); \ 83 _task = NULL; \ 84 } \ 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_ */ 105