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  * 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 #ifndef _LINUX_SCHED_H_
  30 #define _LINUX_SCHED_H_
  31
  32 #include <sys/param.h>
  33 #include <sys/systm.h>
  34 #include <sys/proc.h>
  35 #include <sys/sched.h>
  36 #include <sys/sleepqueue.h>
  37
  38 #define MAX_SCHEDULE_TIMEOUT    LONG_MAX
  39
  40 #define TASK_RUNNING            0
  41 #define TASK_INTERRUPTIBLE      1
  42 #define TASK_UNINTERRUPTIBLE    2
  43 #define TASK_DEAD               64
  44 #define TASK_WAKEKILL           128
  45 #define TASK_WAKING             256
  46
  47 #define TASK_SHOULD_STOP        1
  48 #define TASK_STOPPED            2
  49
  50 /*
  51  * A task_struct is only provided for those tasks created with kthread.
  52  * Using these routines with threads not started via kthread will cause
  53  * panics because no task_struct is allocated and td_retval[1] is
  54  * overwritten by syscalls which kernel threads will not make use of.
  55  */
  56 struct task_struct {
  57         struct  thread *task_thread;
  58         int     (*task_fn)(void *data);
  59         void    *task_data;
  60         int     task_ret;
  61         int     state;
  62         int     should_stop;
  63 };
  64
  65 #define current                 ((struct task_struct *)curthread->td_retval[1])
  66 #define task_struct_get(x)      (struct task_struct *)(x)->td_retval[1]
  67 #define task_struct_set(x, y)   (x)->td_retval[1] = (register_t)(y)
  68
  69 #define set_current_state(x)                                            \
  70         atomic_store_rel_int((volatile int *)&current->state, (x))
  71 #define __set_current_state(x)  current->state = (x)
  72
  73
  74 #define schedule()                                                      \
  75 do {                                                                    \
  76         void *c;                                                        \
  77                                                                         \
  78         if (cold)                                                       \
  79                 break;                                                  \
  80         c = curthread;                                                  \
  81         sleepq_lock(c);                                                 \
  82         if (current->state == TASK_INTERRUPTIBLE ||                     \
  83             current->state == TASK_UNINTERRUPTIBLE) {                   \
  84                 sleepq_add(c, NULL, "task", SLEEPQ_SLEEP, 0);           \
  85                 sleepq_wait(c, 0);                                      \
  86         } else {                                                        \
  87                 sleepq_release(c);                                      \
  88                 sched_relinquish(curthread);                            \
  89         }                                                               \
  90 } while (0)
  91
  92 #define wake_up_process(x)                                              \
  93 do {                                                                    \
  94         int wakeup_swapper;                                             \
  95         void *c;                                                        \
  96                                                                         \
  97         c = (x)->task_thread;                                           \
  98         sleepq_lock(c);                                                 \
  99         (x)->state = TASK_RUNNING;                                      \
 100         wakeup_swapper = sleepq_signal(c, SLEEPQ_SLEEP, 0, 0);          \
 101         sleepq_release(c);                                              \
 102         if (wakeup_swapper)                                             \
 103                 kick_proc0();                                           \
 104 } while (0)
 105
 106 #define cond_resched()  do { if (!cold) sched_relinquish(curthread); } while (0)
 107
 108 #define sched_yield()   sched_relinquish(curthread)
 109
 110 #endif  /* _LINUX_SCHED_H_ */