1 | /* |
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2 | * This example shows a possible blocking of timeslicing if task mode is |
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3 | * changed to timeslicing in the middle of its executing. |
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4 | * |
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5 | * The expected output is: |
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6 | * |
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7 | * Task #0's turn. Now setting turn to 1 |
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8 | * Task #1's turn. Now setting turn to 0 |
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9 | * Task #0's turn. Now setting turn to 1 |
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10 | * Task #1's turn. Now setting turn to 0 |
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11 | * Task #0's turn. Now setting turn to 1 |
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12 | * Task #1's turn. Now setting turn to 0 |
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13 | * Task #0's turn. Now setting turn to 1 |
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14 | * ... |
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15 | * |
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16 | * The actural output is: |
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17 | * |
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18 | * Task #0's turn. Now setting turn to 1 |
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19 | * |
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20 | * Task #1 can not be dispatched also both tasks have timeslice enabled. |
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21 | * |
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22 | * Setting TASK_A/B_INITMODE to RTEMS_DEFAULT_MODES | RTEMS_TIMESLICE |
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23 | * will produce the expected output. |
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24 | */ |
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25 | |
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26 | #include <rtems.h> |
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27 | #include <stdio.h> |
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28 | |
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29 | /*** Task priorities ***/ |
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30 | #define TASK_A_PRIORITY 10 |
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31 | #define TASK_B_PRIORITY 10 |
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32 | |
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33 | /*** Task names ***/ |
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34 | #define TASK_A_NAME 1 |
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35 | #define TASK_B_NAME 2 |
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36 | |
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37 | /*** Task atributes ***/ |
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38 | #define TASK_A_INITMODE RTEMS_DEFAULT_MODES |
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39 | #define TASK_B_INITMODE RTEMS_DEFAULT_MODES |
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40 | |
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41 | /*** Task generic parameters ***/ |
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42 | #define TASK_A_STACKSIZE RTEMS_MINIMUM_STACK_SIZE |
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43 | #define TASK_A_MODEATTR RTEMS_DEFAULT_ATTRIBUTES |
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44 | #define TASK_B_STACKSIZE RTEMS_MINIMUM_STACK_SIZE |
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45 | #define TASK_B_MODEATTR RTEMS_DEFAULT_ATTRIBUTES |
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46 | |
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47 | static rtems_unsigned32 turn; |
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48 | static rtems_id TaskA_id, TaskB_id; |
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49 | |
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50 | #define TEST_FAILED(status, msg) do { \ |
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51 | printf("Test failed, status code: %d, msg: %s\n", status, msg); \ |
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52 | exit(1); \ |
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53 | } while(0) |
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54 | |
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55 | /* TASK A/B */ |
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56 | rtems_task TaskAB_entry(rtems_task_argument me) |
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57 | { |
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58 | static rtems_mode previous_mode_set; |
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59 | rtems_status_code status; |
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60 | |
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61 | status = rtems_task_mode(RTEMS_PREEMPT | RTEMS_TIMESLICE, |
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62 | RTEMS_PREEMPT_MASK | RTEMS_TIMESLICE_MASK, |
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63 | &previous_mode_set); |
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64 | if (status != RTEMS_SUCCESSFUL) |
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65 | TEST_FAILED(status, "Unable to change task mode."); |
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66 | |
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67 | while(1) { |
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68 | if (turn == me) { |
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69 | printf("Task #%d's turn. Now setting turn to %d\n", me, 1 - me); |
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70 | turn = 1 - me; |
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71 | } |
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72 | } |
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73 | } |
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74 | |
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75 | rtems_task Init(rtems_task_argument ignored) |
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76 | { |
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77 | static rtems_status_code status; |
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78 | |
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79 | /* Create Task A */ |
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80 | status=rtems_task_create(TASK_A_NAME, |
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81 | TASK_A_PRIORITY, |
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82 | TASK_A_STACKSIZE, |
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83 | TASK_A_INITMODE, |
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84 | TASK_A_MODEATTR, |
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85 | &TaskA_id); |
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86 | |
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87 | if (status != RTEMS_SUCCESSFUL){ |
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88 | TEST_FAILED(status,"rtems_task_create failed.\n"); |
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89 | } |
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90 | |
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91 | /* Start Task A */ |
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92 | status=rtems_task_start(TaskA_id, TaskAB_entry, 0); |
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93 | if (status != RTEMS_SUCCESSFUL){ |
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94 | TEST_FAILED(status,"rtems_task_start failed.\n"); |
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95 | } |
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96 | |
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97 | /* Create Task B */ |
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98 | status=rtems_task_create(TASK_B_NAME, |
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99 | TASK_B_PRIORITY, |
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100 | TASK_B_STACKSIZE, |
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101 | TASK_B_INITMODE, |
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102 | TASK_B_MODEATTR, |
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103 | &TaskB_id); |
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104 | |
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105 | if (status != RTEMS_SUCCESSFUL){ |
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106 | TEST_FAILED(status,"rtems_task_create failed.\n"); |
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107 | } |
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108 | |
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109 | /* Start Task B */ |
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110 | status=rtems_task_start(TaskB_id, TaskAB_entry, 1); |
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111 | if (status != RTEMS_SUCCESSFUL){ |
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112 | TEST_FAILED(status,"rtems_task_start failed.\n"); |
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113 | } |
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114 | |
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115 | /* Suspend itself */ |
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116 | status=rtems_task_suspend(RTEMS_SELF); |
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117 | if (status != RTEMS_SUCCESSFUL){ |
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118 | TEST_FAILED(status,"rtems_task_suspend failed.\n"); |
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119 | } |
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120 | |
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121 | /* This task is not suposed to be executed anymore */ |
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122 | printf("\nNOT SUPOSED TO RETURN HERE...\n"); |
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123 | exit(1); |
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124 | } |
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125 | |
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126 | /* configuration information */ |
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127 | |
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128 | #define CONFIGURE_APPLICATION_NEEDS_CLOCK_DRIVER |
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129 | #define CONFIGURE_TEST_NEEDS_CONSOLE_DRIVER |
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130 | |
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131 | #define CONFIGURE_MICROSECONDS_PER_TICK 10 |
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132 | #define CONFIGURE_TICKS_PER_TIMESLICE 10 |
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133 | #define CONFIGURE_MAXIMUM_TASKS 10 |
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134 | |
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135 | #define CONFIGURE_RTEMS_INIT_TASKS_TABLE |
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136 | |
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137 | #define CONFIGURE_INIT |
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138 | |
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139 | #include <confdefs.h> |
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