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_SCHED_H_ 32 #define _LINUX_SCHED_H_ 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/proc.h> 37 #include <sys/sched.h> 38 #include <sys/sleepqueue.h> 39 40 #define MAX_SCHEDULE_TIMEOUT LONG_MAX 41 42 #define TASK_RUNNING 0 43 #define TASK_INTERRUPTIBLE 1 44 #define TASK_UNINTERRUPTIBLE 2 45 #define TASK_DEAD 64 46 #define TASK_WAKEKILL 128 47 #define TASK_WAKING 256 48 49 #define TASK_SHOULD_STOP 1 50 #define TASK_STOPPED 2 51 52 /* 53 * A task_struct is only provided for those tasks created with kthread. 54 * Using these routines with threads not started via kthread will cause 55 * panics because no task_struct is allocated and td_retval[1] is 56 * overwritten by syscalls which kernel threads will not make use of. 57 */ 58 struct task_struct { 59 struct thread *task_thread; 60 int (*task_fn)(void *data); 61 void *task_data; 62 int task_ret; 63 int state; 64 int should_stop; 65 }; 66 67 #define current task_struct_get(curthread) 68 #define task_struct_get(x) ((struct task_struct *)(uintptr_t)(x)->td_retval[1]) 69 #define task_struct_set(x, y) (x)->td_retval[1] = (uintptr_t)(y) 70 71 /* ensure the task_struct pointer fits into the td_retval[1] field */ 72 CTASSERT(sizeof(((struct thread *)0)->td_retval[1]) >= sizeof(uintptr_t)); 73 74 #define set_current_state(x) \ 75 atomic_store_rel_int((volatile int *)¤t->state, (x)) 76 #define __set_current_state(x) current->state = (x) 77 78 79 #define schedule() \ 80 do { \ 81 void *c; \ 82 \ 83 if (cold) \ 84 break; \ 85 c = curthread; \ 86 sleepq_lock(c); \ 87 if (current->state == TASK_INTERRUPTIBLE || \ 88 current->state == TASK_UNINTERRUPTIBLE) { \ 89 sleepq_add(c, NULL, "task", SLEEPQ_SLEEP, 0); \ 90 sleepq_wait(c, 0); \ 91 } else { \ 92 sleepq_release(c); \ 93 sched_relinquish(curthread); \ 94 } \ 95 } while (0) 96 97 #define wake_up_process(x) \ 98 do { \ 99 int wakeup_swapper; \ 100 void *c; \ 101 \ 102 c = (x)->task_thread; \ 103 sleepq_lock(c); \ 104 (x)->state = TASK_RUNNING; \ 105 wakeup_swapper = sleepq_signal(c, SLEEPQ_SLEEP, 0, 0); \ 106 sleepq_release(c); \ 107 if (wakeup_swapper) \ 108 kick_proc0(); \ 109 } while (0) 110 111 #define cond_resched() if (!cold) sched_relinquish(curthread) 112 113 #define sched_yield() sched_relinquish(curthread) 114 115 static inline long 116 schedule_timeout(signed long timeout) 117 { 118 if (timeout < 0) 119 return 0; 120 121 pause("lstim", timeout); 122 123 return 0; 124 } 125 126 #endif /* _LINUX_SCHED_H_ */ 127