sys/ofed/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  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice unmodified, this list of conditions, and the following
  12  *    disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28 #ifndef _LINUX_SCHED_H_
  29 #define _LINUX_SCHED_H_
  30
  31 #include <sys/param.h>
  32 #include <sys/systm.h>
  33 #include <sys/proc.h>
  34 #include <sys/sched.h>
  35 #include <sys/sleepqueue.h>
  36
  37 #define MAX_SCHEDULE_TIMEOUT    LONG_MAX
  38
  39 #define TASK_RUNNING            0
  40 #define TASK_INTERRUPTIBLE      1
  41 #define TASK_UNINTERRUPTIBLE    2
  42 #define TASK_DEAD               64
  43 #define TASK_WAKEKILL           128
  44 #define TASK_WAKING             256
  45
  46 #define TASK_SHOULD_STOP        1
  47 #define TASK_STOPPED            2
  48
  49 /*
  50  * A task_struct is only provided for those tasks created with kthread.
  51  * Using these routines with threads not started via kthread will cause
  52  * panics because no task_struct is allocated and td_retval[1] is
  53  * overwritten by syscalls which kernel threads will not make use of.
  54  */
  55 struct task_struct {
  56         struct  thread *task_thread;
  57         int     (*task_fn)(void *data);
  58         void    *task_data;
  59         int     task_ret;
  60         int     state;
  61         int     should_stop;
  62 };
  63
  64 #define current                 ((struct task_struct *)curthread->td_retval[1])
  65 #define task_struct_get(x)      (struct task_struct *)(x)->td_retval[1]
  66 #define task_struct_set(x, y)   (x)->td_retval[1] = (register_t)(y)
  67
  68 #define set_current_state(x)                                            \
  69         atomic_store_rel_int((volatile int *)&current->state, (x))
  70 #define __set_current_state(x)  current->state = (x)
  71
  72
  73 #define schedule()                                                      \
  74 do {                                                                    \
  75         void *c;                                                        \
  76                                                                         \
  77         if (cold)                                                       \
  78                 break;                                                  \
  79         c = curthread;                                                  \
  80         sleepq_lock(c);                                                 \
  81         if (current->state == TASK_INTERRUPTIBLE ||                     \
  82             current->state == TASK_UNINTERRUPTIBLE) {                   \
  83                 sleepq_add(c, NULL, "task", SLEEPQ_SLEEP, 0);           \
  84                 sleepq_wait(c, 0);                                      \
  85         } else {                                                        \
  86                 sleepq_release(c);                                      \
  87                 sched_relinquish(curthread);                            \
  88         }                                                               \
  89 } while (0)
  90
  91 #define wake_up_process(x)                                              \
  92 do {                                                                    \
  93         int wakeup_swapper;                                             \
  94         void *c;                                                        \
  95                                                                         \
  96         c = (x)->task_thread;                                           \
  97         sleepq_lock(c);                                                 \
  98         (x)->state = TASK_RUNNING;                                      \
  99         wakeup_swapper = sleepq_signal(c, SLEEPQ_SLEEP, 0, 0);          \
 100         sleepq_release(c);                                              \
 101         if (wakeup_swapper)                                             \
 102                 kick_proc0();                                           \
 103 } while (0)
 104
 105 #define cond_resched()  if (!cold)      sched_relinquish(curthread)
 106
 107 #define sched_yield()   sched_relinquish(curthread)
 108
 109 #endif  /* _LINUX_SCHED_H_ */