1 | /* |
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2 | * Copyright (c) 2014 Daniel Ramirez. (javamonn@gmail.com) |
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3 | * |
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4 | * This file's license is 2-clause BSD as in this distribution's LICENSE file. |
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5 | */ |
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6 | |
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7 | #include <rtems/timerdrv.h> |
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8 | #include <timesys.h> |
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9 | |
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10 | #define BENCHMARKS 20000 |
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11 | |
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12 | rtems_task Task01( rtems_task_argument ignored ); |
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13 | rtems_task Task02( rtems_task_argument ignored ); |
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14 | rtems_task Task03( rtems_task_argument ignored ); |
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15 | rtems_task Init( rtems_task_argument ignored ); |
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16 | |
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17 | rtems_id Task_id[3]; |
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18 | rtems_name Task_name[3]; |
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19 | rtems_id sem_id; |
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20 | rtems_name sem_name; |
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21 | rtems_status_code status; |
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22 | |
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23 | uint32_t count; |
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24 | uint32_t telapsed; |
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25 | uint32_t tswitch_overhead; |
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26 | uint32_t tobtain_overhead; |
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27 | uint32_t sem_exe; |
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28 | |
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29 | rtems_task Init( rtems_task_argument ignored ) |
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30 | { |
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31 | rtems_attribute sem_attr; |
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32 | rtems_task_priority pri; |
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33 | rtems_mode prev_mode; |
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34 | |
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35 | Print_Warning(); |
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36 | |
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37 | sem_attr = RTEMS_INHERIT_PRIORITY | RTEMS_BINARY_SEMAPHORE | RTEMS_PRIORITY; |
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38 | |
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39 | sem_name = rtems_build_name( 'S','0',' ',' ' ); |
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40 | status = rtems_semaphore_create( |
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41 | sem_name, |
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42 | 1, |
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43 | sem_attr, |
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44 | 0, |
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45 | &sem_id |
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46 | ); |
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47 | directive_failed( status, "rtems_semaphore_create of S0" ); |
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48 | |
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49 | Task_name[0] = rtems_build_name( 'T','A','0','1' ); |
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50 | status = rtems_task_create( |
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51 | Task_name[0], |
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52 | 26, /* High priority task */ |
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53 | RTEMS_MINIMUM_STACK_SIZE, |
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54 | RTEMS_DEFAULT_MODES, |
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55 | RTEMS_DEFAULT_ATTRIBUTES, |
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56 | &Task_id[0] |
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57 | ); |
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58 | directive_failed( status, "rtems_task_create of TA01" ); |
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59 | |
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60 | Task_name[1] = rtems_build_name( 'T','A','0','2' ); |
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61 | status = rtems_task_create( |
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62 | Task_name[1], |
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63 | 28, /* Mid priority task */ |
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64 | RTEMS_MINIMUM_STACK_SIZE, |
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65 | RTEMS_DEFAULT_MODES, |
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66 | RTEMS_DEFAULT_ATTRIBUTES, |
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67 | &Task_id[1] |
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68 | ); |
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69 | directive_failed( status, "rtems_task_create of TA02" ); |
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70 | |
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71 | Task_name[2] = rtems_build_name( 'T','A','0','3' ); |
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72 | status = rtems_task_create( |
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73 | Task_name[2], |
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74 | 30, /* Low priority task */ |
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75 | RTEMS_MINIMUM_STACK_SIZE, |
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76 | RTEMS_DEFAULT_MODES, |
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77 | RTEMS_DEFAULT_ATTRIBUTES, |
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78 | &Task_id[2] |
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79 | ); |
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80 | directive_failed( status, "rtems_task_create of TA03" ); |
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81 | |
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82 | /* find overhead of obtaining semaphore */ |
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83 | benchmark_timer_initialize(); |
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84 | rtems_semaphore_obtain( sem_id, RTEMS_WAIT, 0 ); |
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85 | tobtain_overhead = benchmark_timer_read(); |
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86 | rtems_semaphore_release( sem_id ); |
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87 | |
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88 | rtems_task_mode( RTEMS_PREEMPT, RTEMS_PREEMPT_MASK, &prev_mode ); |
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89 | /* Lower own priority so tasks can start up and run */ |
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90 | rtems_task_set_priority( RTEMS_SELF, 40, &pri ); |
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91 | |
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92 | /* Get time of benchmark with no semaphores involved, i.e. find overhead */ |
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93 | sem_exe = 0; |
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94 | status = rtems_task_start( Task_id[2], Task03, 0 ); |
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95 | directive_failed( status, "rtems_task_start of TA03" ); |
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96 | |
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97 | /* Get time of benchmark with semaphores */ |
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98 | sem_exe = 1; |
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99 | status = rtems_task_restart( Task_id[2], 0 ); |
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100 | directive_failed( status, "rtems_task_start of TA03" ); |
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101 | |
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102 | /* Should never reach here */ |
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103 | rtems_test_assert( false ); |
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104 | } |
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105 | |
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106 | rtems_task Task01( rtems_task_argument ignored ) |
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107 | { |
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108 | /* All tasks have had time to start up once TA01 is running */ |
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109 | |
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110 | /* Benchmark code */ |
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111 | benchmark_timer_initialize(); |
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112 | for ( count = 0; count < BENCHMARKS; count++ ) { |
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113 | if ( sem_exe == 1 ) { |
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114 | /* Block on call */ |
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115 | rtems_semaphore_obtain( sem_id, RTEMS_WAIT, 0 ); |
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116 | } |
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117 | |
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118 | if ( sem_exe == 1 ) { |
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119 | /* Release semaphore immediately after obtaining it */ |
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120 | rtems_semaphore_release( sem_id ); |
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121 | } |
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122 | |
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123 | /* Suspend self, go to TA02 */ |
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124 | rtems_task_suspend( RTEMS_SELF ); |
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125 | } |
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126 | telapsed = benchmark_timer_read(); |
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127 | |
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128 | /* Check which run this was */ |
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129 | if (sem_exe == 0) { |
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130 | tswitch_overhead = telapsed; |
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131 | rtems_task_suspend( Task_id[1] ); |
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132 | rtems_task_suspend( Task_id[2] ); |
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133 | rtems_task_suspend( RTEMS_SELF ); |
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134 | } else { |
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135 | put_time( |
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136 | "Rhealstone: Deadlock Break", |
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137 | telapsed, |
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138 | BENCHMARKS, /* Total number of times deadlock broken*/ |
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139 | tswitch_overhead, /* Overhead of loop and task switches */ |
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140 | tobtain_overhead |
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141 | ); |
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142 | rtems_test_exit( 0 ); |
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143 | } |
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144 | |
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145 | } |
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146 | |
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147 | rtems_task Task02( rtems_task_argument ignored ) |
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148 | { |
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149 | /* Start up TA01, get preempted */ |
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150 | if ( sem_exe == 1) { |
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151 | status = rtems_task_restart( Task_id[0], 0); |
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152 | directive_failed( status, "rtems_task_start of TA01"); |
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153 | } else { |
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154 | status = rtems_task_start( Task_id[0], Task01, 0); |
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155 | directive_failed( status, "rtems_task_start of TA01"); |
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156 | } |
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157 | |
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158 | /* Benchmark code */ |
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159 | for ( ; count < BENCHMARKS ; ) { |
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160 | /* Suspend self, go to TA01 */ |
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161 | rtems_task_suspend( RTEMS_SELF ); |
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162 | |
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163 | /* Wake up TA01, get preempted */ |
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164 | rtems_task_resume( Task_id[0] ); |
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165 | } |
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166 | } |
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167 | |
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168 | rtems_task Task03( rtems_task_argument ignored ) |
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169 | { |
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170 | if (sem_exe == 1) { |
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171 | /* Low priority task holds mutex */ |
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172 | rtems_semaphore_obtain( sem_id, RTEMS_WAIT, 0 ); |
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173 | } |
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174 | |
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175 | /* Start up TA02, get preempted */ |
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176 | if ( sem_exe == 1) { |
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177 | status = rtems_task_restart( Task_id[1], 0); |
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178 | directive_failed( status, "rtems_task_start of TA02"); |
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179 | } else { |
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180 | status = rtems_task_start( Task_id[1], Task02, 0); |
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181 | directive_failed( status, "rtems_task_start of TA02"); |
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182 | } |
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183 | |
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184 | /* Benchmark code */ |
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185 | for ( ; count < BENCHMARKS ; ) { |
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186 | if ( sem_exe == 1 ) { |
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187 | /* Preempted by TA01 upon release */ |
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188 | rtems_semaphore_release( sem_id ); |
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189 | } |
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190 | |
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191 | if ( sem_exe == 1 ) { |
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192 | /* Prepare for next Benchmark */ |
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193 | rtems_semaphore_obtain( sem_id, RTEMS_WAIT, 0 ); |
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194 | } |
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195 | /* Wake up TA02, get preempted */ |
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196 | rtems_task_resume( Task_id[1] ); |
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197 | } |
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198 | } |
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199 | |
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200 | /* configuration information */ |
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201 | #define CONFIGURE_APPLICATION_NEEDS_CONSOLE_DRIVER |
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202 | #define CONFIGURE_APPLICATION_NEEDS_TIMER_DRIVER |
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203 | |
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204 | #define CONFIGURE_TICKS_PER_TIMESLICE 0 |
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205 | #define CONFIGURE_RTEMS_INIT_TASKS_TABLE |
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206 | #define CONFIGURE_MAXIMUM_SEMAPHORES 1 |
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207 | #define CONFIGURE_MAXIMUM_TASKS 4 |
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208 | |
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209 | #define CONFIGURE_INIT |
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210 | #include <rtems/confdefs.h> |
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