1 | /*- |
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2 | * Copyright (c) 2010 Isilon Systems, Inc. |
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3 | * Copyright (c) 2010 iX Systems, Inc. |
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4 | * Copyright (c) 2010 Panasas, Inc. |
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5 | * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd. |
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6 | * All rights reserved. |
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7 | * |
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8 | * Redistribution and use in source and binary forms, with or without |
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9 | * modification, are permitted provided that the following conditions |
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10 | * are met: |
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11 | * 1. Redistributions of source code must retain the above copyright |
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12 | * notice unmodified, this list of conditions, and the following |
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13 | * disclaimer. |
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14 | * 2. Redistributions in binary form must reproduce the above copyright |
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15 | * notice, this list of conditions and the following disclaimer in the |
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16 | * documentation and/or other materials provided with the distribution. |
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17 | * |
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18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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28 | * |
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29 | * $FreeBSD$ |
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30 | */ |
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31 | #ifndef _LINUX_SCHED_H_ |
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32 | #define _LINUX_SCHED_H_ |
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33 | |
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34 | #include <sys/param.h> |
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35 | #include <sys/lock.h> |
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36 | #include <sys/mutex.h> |
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37 | #include <sys/systm.h> |
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38 | #include <sys/proc.h> |
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39 | #include <sys/sched.h> |
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40 | #include <sys/sleepqueue.h> |
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41 | |
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42 | #define MAX_SCHEDULE_TIMEOUT LONG_MAX |
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43 | |
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44 | #define TASK_DORMANT 0 |
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45 | #define TASK_RUNNING 1 |
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46 | #define TASK_INTERRUPTIBLE 2 |
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47 | #define TASK_UNINTERRUPTIBLE 4 |
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48 | #define TASK_DEAD 64 |
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49 | #define TASK_WAKEKILL 128 |
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50 | #define TASK_WAKING 256 |
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51 | |
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52 | #define TASK_SHOULD_STOP 1 |
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53 | #define TASK_STOPPED 2 |
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54 | |
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55 | /* |
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56 | * A task_struct is only provided for those tasks created with kthread. |
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57 | * Using these routines with threads not started via kthread will cause |
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58 | * panics because no task_struct is allocated and td_retval[1] is |
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59 | * overwritten by syscalls which kernel threads will not make use of. |
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60 | */ |
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61 | struct task_struct { |
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62 | struct thread *task_thread; |
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63 | int (*task_fn)(void *data); |
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64 | void *task_data; |
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65 | int task_ret; |
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66 | int state; |
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67 | int should_stop; |
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68 | struct mtx lock; |
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69 | }; |
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70 | |
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71 | #define current ((struct task_struct *)curthread->td_retval[1]) |
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72 | #define task_struct_get(x) (struct task_struct *)(x)->td_retval[1] |
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73 | #define task_struct_set(x, y) (x)->td_retval[1] = (register_t)(y) |
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74 | |
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75 | #define set_current_state(x) \ |
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76 | atomic_store_rel_int((volatile int *)¤t->state, (x)) |
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77 | #define __set_current_state(x) current->state = (x) |
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78 | |
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79 | |
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80 | #define schedule() \ |
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81 | do { \ |
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82 | void *c; \ |
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83 | \ |
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84 | if (cold) \ |
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85 | break; \ |
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86 | c = curthread; \ |
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87 | sleepq_lock(c); \ |
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88 | if (current->state == TASK_INTERRUPTIBLE || \ |
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89 | current->state == TASK_UNINTERRUPTIBLE) { \ |
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90 | sleepq_add(c, NULL, "task", SLEEPQ_SLEEP, 0); \ |
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91 | sleepq_wait(c, 0); \ |
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92 | } else { \ |
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93 | sleepq_release(c); \ |
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94 | sched_relinquish(curthread); \ |
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95 | } \ |
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96 | } while (0) |
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97 | |
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98 | #define wake_up_process(x) \ |
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99 | do { \ |
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100 | int wakeup_swapper; \ |
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101 | void *c; \ |
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102 | \ |
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103 | c = (x)->task_thread; \ |
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104 | sleepq_lock(c); \ |
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105 | (x)->state = TASK_RUNNING; \ |
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106 | wakeup_swapper = sleepq_signal(c, SLEEPQ_SLEEP, 0, 0); \ |
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107 | sleepq_release(c); \ |
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108 | if (wakeup_swapper) \ |
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109 | kick_proc0(); \ |
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110 | } while (0) |
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111 | |
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112 | #define cond_resched() if (!cold) sched_relinquish(curthread) |
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113 | |
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114 | static inline long |
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115 | schedule_timeout(signed long timeout) |
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116 | { |
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117 | if (timeout < 0) |
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118 | return 0; |
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119 | |
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120 | pause("lstim", timeout); |
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121 | |
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122 | return 0; |
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123 | } |
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124 | |
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125 | #endif /* _LINUX_SCHED_H_ */ |
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