scoutos / prex-0.9.0 / usr / sample / thread / thread.c @ 03e9c04a
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1 | 03e9c04a | Brad Neuman | /*
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2 | * Copyright (c) 2005, Kohsuke Ohtani
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3 | * All rights reserved.
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4 | *
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5 | * Redistribution and use in source and binary forms, with or without
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6 | * modification, are permitted provided that the following conditions
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7 | * are met:
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8 | * 1. Redistributions of source code must retain the above copyright
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9 | * notice, this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright
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11 | * notice, this list of conditions and the following disclaimer in the
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12 | * documentation and/or other materials provided with the distribution.
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13 | * 3. Neither the name of the author nor the names of any co-contributors
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14 | * may be used to endorse or promote products derived from this software
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15 | * without specific prior written permission.
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16 | *
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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27 | * SUCH DAMAGE.
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28 | */
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29 | |||
30 | /*
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31 | * thread.c - sample program to create three threads.
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32 | */
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33 | |||
34 | #include <sys/prex.h> |
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35 | #include <stdio.h> |
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36 | |||
37 | #define VERBOSE_MODE
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38 | |||
39 | #ifdef VERBOSE_MODE
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40 | #define thr_printf(s) sys_log(s)
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41 | #else
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42 | #define thr_printf(s)
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43 | #endif
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44 | |||
45 | static thread_t main_th;
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46 | static char stack[3][1024]; |
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47 | |||
48 | /*
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49 | * Run specified routine as new thread.
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50 | */
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51 | static int |
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52 | thread_run(void (*start)(void), void *stack) |
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53 | { |
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54 | thread_t t; |
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55 | |||
56 | if (thread_create(task_self(), &t) != 0) |
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57 | return -1; |
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58 | |||
59 | if (thread_load(t, start, stack) != 0) |
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60 | return -1; |
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61 | |||
62 | if (thread_setpri(t, 128) != 0) |
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63 | return -1; |
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64 | |||
65 | if (thread_resume(t) != 0) |
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66 | return -1; |
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67 | return 0; |
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68 | } |
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69 | |||
70 | /*
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71 | * Display 'AAAA...'
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72 | */
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73 | static void |
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74 | thread_A(void)
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75 | { |
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76 | int i;
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77 | |||
78 | thr_printf("\nthread A is starting\n");
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79 | |||
80 | for (i = 0; i < 1024; i++) { |
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81 | thr_printf("A");
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82 | if ((i & 0xff) == 0) |
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83 | thread_yield(); |
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84 | } |
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85 | thr_printf("\nthread A is terminated\n");
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86 | thread_terminate(thread_self()); |
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87 | } |
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88 | |||
89 | /*
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90 | * Display 'BBBB...'
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91 | */
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92 | static void |
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93 | thread_B(void)
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94 | { |
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95 | int i;
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96 | |||
97 | thr_printf("\nthread B is starting\n");
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98 | |||
99 | for (i = 0; i < 4096; i++) { |
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100 | thr_printf("B");
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101 | if ((i & 0xff) == 0) |
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102 | thread_yield(); |
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103 | } |
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104 | thr_printf("\nthread B is terminated\n");
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105 | thread_terminate(thread_self()); |
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106 | } |
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107 | |||
108 | /*
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109 | * Display 'CCCC...'
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110 | */
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111 | static void |
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112 | thread_C(void)
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113 | { |
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114 | int i;
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115 | |||
116 | thr_printf("\nthread C is starting\n");
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117 | |||
118 | for (i = 0; i < 8192; i++) { |
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119 | thr_printf("C");
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120 | if ((i & 0xff) == 0) |
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121 | thread_yield(); |
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122 | } |
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123 | thr_printf("\nthread C is terminated\n");
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124 | thread_terminate(thread_self()); |
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125 | } |
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126 | |||
127 | int
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128 | main(int argc, char *argv[]) |
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129 | { |
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130 | int error;
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131 | |||
132 | printf("Thread sample program\n");
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133 | main_th = thread_self(); |
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134 | |||
135 | timer_sleep(1000, 0); |
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136 | |||
137 | /*
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138 | * Raise this thread's priority.
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139 | */
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140 | error = thread_setpri(main_th, 100);
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141 | |||
142 | /*
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143 | * Run threads as normal priority thread.
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144 | */
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145 | thread_run(thread_A, stack[0]+1024); |
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146 | thread_run(thread_B, stack[1]+1024); |
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147 | thread_run(thread_C, stack[2]+1024); |
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148 | |||
149 | /*
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150 | * Lower this thread's priority.
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151 | */
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152 | error = thread_setpri(main_th, 254);
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153 | /*
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154 | * Since other threads have higher priority than
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155 | * this thread, the control will come here only when
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156 | * all other threads are terminated.
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157 | */
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158 | printf("test - OK!\n");
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159 | return 0; |
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160 | } |