sched.h revision 299526
1124961Ssobomax/*- 2124961Ssobomax * Copyright (c) 2010 Isilon Systems, Inc. 3138722Snjl * Copyright (c) 2010 iX Systems, Inc. 4124961Ssobomax * Copyright (c) 2010 Panasas, Inc. 5124961Ssobomax * Copyright (c) 2013-2016 Mellanox Technologies, Ltd. 6124961Ssobomax * All rights reserved. 7124961Ssobomax * 8124961Ssobomax * Redistribution and use in source and binary forms, with or without 9124961Ssobomax * modification, are permitted provided that the following conditions 10124961Ssobomax * are met: 11124961Ssobomax * 1. Redistributions of source code must retain the above copyright 12124961Ssobomax * notice unmodified, this list of conditions, and the following 13124961Ssobomax * disclaimer. 14124961Ssobomax * 2. Redistributions in binary form must reproduce the above copyright 15124961Ssobomax * notice, this list of conditions and the following disclaimer in the 16124961Ssobomax * documentation and/or other materials provided with the distribution. 17124961Ssobomax * 18124961Ssobomax * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19124961Ssobomax * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20124961Ssobomax * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21124961Ssobomax * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22124961Ssobomax * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23124961Ssobomax * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24124961Ssobomax * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25124961Ssobomax * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26124961Ssobomax * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27124961Ssobomax * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28124961Ssobomax * 29124961Ssobomax * $FreeBSD: head/sys/compat/linuxkpi/common/include/linux/sched.h 299526 2016-05-12 09:06:54Z hselasky $ 30124961Ssobomax */ 31124961Ssobomax#ifndef _LINUX_SCHED_H_ 32124961Ssobomax#define _LINUX_SCHED_H_ 33124961Ssobomax 34124961Ssobomax#include <sys/param.h> 35124961Ssobomax#include <sys/systm.h> 36124961Ssobomax#include <sys/proc.h> 37124961Ssobomax#include <sys/sched.h> 38124961Ssobomax#include <sys/sleepqueue.h> 39124961Ssobomax 40124961Ssobomax#define MAX_SCHEDULE_TIMEOUT LONG_MAX 41124961Ssobomax 42124961Ssobomax#define TASK_RUNNING 0 43124961Ssobomax#define TASK_INTERRUPTIBLE 1 44124961Ssobomax#define TASK_UNINTERRUPTIBLE 2 45124961Ssobomax#define TASK_DEAD 64 46124961Ssobomax#define TASK_WAKEKILL 128 47124961Ssobomax#define TASK_WAKING 256 48124961Ssobomax 49185341Sjkim#define TASK_SHOULD_STOP 1 50124961Ssobomax#define TASK_STOPPED 2 51124961Ssobomax 52124961Ssobomax/* 53124961Ssobomax * A task_struct is only provided for threads created by kthread() and 54124961Ssobomax * file operation callbacks. 55124961Ssobomax * 56124961Ssobomax * Using these routines outside the above mentioned contexts will 57124961Ssobomax * cause panics because no task_struct is assigned and td_retval[1] is 58124961Ssobomax * overwritten by syscalls. 59124961Ssobomax */ 60124961Ssobomaxstruct task_struct { 61124961Ssobomax struct thread *task_thread; 62124961Ssobomax int (*task_fn)(void *data); 63124961Ssobomax void *task_data; 64124961Ssobomax int task_ret; 65124961Ssobomax int state; 66124961Ssobomax int should_stop; 67124961Ssobomax pid_t pid; 68124961Ssobomax const char *comm; 69124961Ssobomax}; 70124961Ssobomax 71124961Ssobomax#define current task_struct_get(curthread) 72124961Ssobomax#define task_struct_get(x) ((struct task_struct *)(uintptr_t)(x)->td_retval[1]) 73124961Ssobomax#define task_struct_fill(x, y) do { \ 74124961Ssobomax (y)->task_thread = (x); \ 75124961Ssobomax (y)->comm = (x)->td_name; \ 76124961Ssobomax (y)->pid = (x)->td_tid; \ 77124961Ssobomax} while (0) 78124961Ssobomax#define task_struct_set(x, y) (x)->td_retval[1] = (uintptr_t)(y) 79124961Ssobomax 80124961Ssobomax/* ensure the task_struct pointer fits into the td_retval[1] field */ 81124961SsobomaxCTASSERT(sizeof(((struct thread *)0)->td_retval[1]) >= sizeof(uintptr_t)); 82124961Ssobomax 83124961Ssobomax#define set_current_state(x) \ 84124961Ssobomax atomic_store_rel_int((volatile int *)¤t->state, (x)) 85124961Ssobomax#define __set_current_state(x) current->state = (x) 86124961Ssobomax 87214346Sjhb 88124961Ssobomax#define schedule() \ 89124961Ssobomaxdo { \ 90124961Ssobomax void *c; \ 91214346Sjhb \ 92124961Ssobomax if (cold) \ 93124961Ssobomax break; \ 94124961Ssobomax c = curthread; \ 95124961Ssobomax sleepq_lock(c); \ 96124961Ssobomax if (current->state == TASK_INTERRUPTIBLE || \ 97124961Ssobomax current->state == TASK_UNINTERRUPTIBLE) { \ 98124961Ssobomax sleepq_add(c, NULL, "task", SLEEPQ_SLEEP, 0); \ 99124961Ssobomax sleepq_wait(c, 0); \ 100124961Ssobomax } else { \ 101124961Ssobomax sleepq_release(c); \ 102124961Ssobomax sched_relinquish(curthread); \ 103124961Ssobomax } \ 104124961Ssobomax} while (0) 105124961Ssobomax 106124961Ssobomax#define wake_up_process(x) \ 107214346Sjhbdo { \ 108124961Ssobomax int wakeup_swapper; \ 109124961Ssobomax void *c; \ 110124961Ssobomax \ 111124961Ssobomax c = (x)->task_thread; \ 112124961Ssobomax sleepq_lock(c); \ 113124961Ssobomax (x)->state = TASK_RUNNING; \ 114214346Sjhb wakeup_swapper = sleepq_signal(c, SLEEPQ_SLEEP, 0, 0); \ 115124961Ssobomax sleepq_release(c); \ 116124961Ssobomax if (wakeup_swapper) \ 117214346Sjhb kick_proc0(); \ 118124961Ssobomax} while (0) 119124961Ssobomax 120124961Ssobomax#define cond_resched() if (!cold) sched_relinquish(curthread) 121124961Ssobomax 122124961Ssobomax#define sched_yield() sched_relinquish(curthread) 123124961Ssobomax 124214346Sjhbstatic inline long 125124961Ssobomaxschedule_timeout(signed long timeout) 126124961Ssobomax{ 127124961Ssobomax if (timeout < 0) 128124961Ssobomax return 0; 129124961Ssobomax 130124961Ssobomax pause("lstim", timeout); 131214346Sjhb 132124961Ssobomax return 0; 133124961Ssobomax} 134124961Ssobomax 135124961Ssobomax#endif /* _LINUX_SCHED_H_ */ 136124961Ssobomax