sys/compat/linuxkpi/common/include/linux/sched.h

   1 /*-
   2  * Copyright (c) 2010 Isilon Systems, Inc.
   3  * Copyright (c) 2010 iX Systems, Inc.
   4  * Copyright (c) 2010 Panasas, Inc.
   5  * Copyright (c) 2013-2017 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 #include <linux/types.h>
  41 #include <linux/completion.h>
  42 #include <linux/slab.h>
  43
  44 #include <asm/atomic.h>
  45
  46 #define MAX_SCHEDULE_TIMEOUT    LONG_MAX
  47
  48 #define TASK_RUNNING            0
  49 #define TASK_INTERRUPTIBLE      1
  50 #define TASK_UNINTERRUPTIBLE    2
  51 #define TASK_DEAD               64
  52 #define TASK_WAKEKILL           128
  53 #define TASK_WAKING             256
  54
  55 struct task_struct {
  56         struct thread *task_thread;
  57         linux_task_fn_t *task_fn;
  58         void   *task_data;
  59         int     task_ret;
  60         int     state;
  61         atomic_t kthread_flags;
  62         pid_t   pid;
  63         const char    *comm;
  64         void   *bsd_ioctl_data;
  65         unsigned bsd_ioctl_len;
  66         struct completion parked;
  67         struct completion exited;
  68 };
  69
  70 #define current         ((struct task_struct *)curthread->td_lkpi_task)
  71
  72 #define set_current_state(x)                                            \
  73         atomic_store_rel_int((volatile int *)&current->state, (x))
  74 #define __set_current_state(x)  current->state = (x)
  75
  76
  77 #define schedule()                                                      \
  78 do {                                                                    \
  79         void *c;                                                        \
  80                                                                         \
  81         if (cold || SCHEDULER_STOPPED())                                \
  82                 break;                                                  \
  83         c = curthread;                                                  \
  84         sleepq_lock(c);                                                 \
  85         if (current->state == TASK_INTERRUPTIBLE ||                     \
  86             current->state == TASK_UNINTERRUPTIBLE) {                   \
  87                 sleepq_add(c, NULL, "task", SLEEPQ_SLEEP, 0);           \
  88                 sleepq_wait(c, 0);                                      \
  89         } else {                                                        \
  90                 sleepq_release(c);                                      \
  91                 sched_relinquish(curthread);                            \
  92         }                                                               \
  93 } while (0)
  94
  95 #define wake_up_process(x)                                              \
  96 do {                                                                    \
  97         int wakeup_swapper;                                             \
  98         void *c;                                                        \
  99                                                                         \
 100         c = (x)->task_thread;                                           \
 101         sleepq_lock(c);                                                 \
 102         (x)->state = TASK_RUNNING;                                      \
 103         wakeup_swapper = sleepq_signal(c, SLEEPQ_SLEEP, 0, 0);          \
 104         sleepq_release(c);                                              \
 105         if (wakeup_swapper)                                             \
 106                 kick_proc0();                                           \
 107 } while (0)
 108
 109 #define cond_resched()  if (!cold)      sched_relinquish(curthread)
 110
 111 #define sched_yield()   sched_relinquish(curthread)
 112
 113 static inline long
 114 schedule_timeout(signed long timeout)
 115 {
 116         if (timeout < 0)
 117                 return 0;
 118
 119         pause("lstim", timeout);
 120
 121         return 0;
 122 }
 123
 124 #endif  /* _LINUX_SCHED_H_ */