Mercurial > ecos
annotate packages/kernel/current/tests/kphilo.c @ 2729:74dbf4c3f2e1 after-copyright-change-20090129
Update all copyright banners to reflect FSF ownership; fix and improve licence text.
| author | jlarmour |
|---|---|
| date | Thu, 29 Jan 2009 17:47:46 +0000 |
| parents | d2c90368aeef |
| children |
| rev | line source |
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| 0 | 1 //========================================================================== |
| 2 // | |
| 3 // kphilo.c | |
| 4 // | |
| 5 // A test of the dining philosophers problem | |
| 6 // | |
| 7 //========================================================================== | |
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8 // ####ECOSGPLCOPYRIGHTBEGIN#### |
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9 // ------------------------------------------- |
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10 // This file is part of eCos, the Embedded Configurable Operating System. |
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11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc. |
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12 // |
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13 // eCos is free software; you can redistribute it and/or modify it under |
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14 // the terms of the GNU General Public License as published by the Free |
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15 // Software Foundation; either version 2 or (at your option) any later |
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16 // version. |
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17 // |
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18 // eCos is distributed in the hope that it will be useful, but WITHOUT |
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19 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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20 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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21 // for more details. |
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22 // |
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23 // You should have received a copy of the GNU General Public License |
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24 // along with eCos; if not, write to the Free Software Foundation, Inc., |
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25 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
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26 // |
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27 // As a special exception, if other files instantiate templates or use |
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28 // macros or inline functions from this file, or you compile this file |
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29 // and link it with other works to produce a work based on this file, |
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30 // this file does not by itself cause the resulting work to be covered by |
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31 // the GNU General Public License. However the source code for this file |
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32 // must still be made available in accordance with section (3) of the GNU |
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33 // General Public License v2. |
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34 // |
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35 // This exception does not invalidate any other reasons why a work based |
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36 // on this file might be covered by the GNU General Public License. |
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37 // ------------------------------------------- |
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38 // ####ECOSGPLCOPYRIGHTEND#### |
| 0 | 39 //========================================================================== |
| 40 //#####DESCRIPTIONBEGIN#### | |
| 41 // | |
| 42 // Author(s): dsm | |
| 43 // Contributors: dsm | |
| 44 // Date: 1998-02-24 | |
| 45 // Description: A test of the dining philosophers problem | |
| 46 //####DESCRIPTIONEND#### | |
| 47 // | |
| 48 | |
| 49 #include <cyg/kernel/kapi.h> | |
| 50 | |
| 51 #include <cyg/infra/cyg_ass.h> | |
| 52 #include <cyg/kernel/diag.h> | |
| 53 | |
| 54 // ------------------------------------------------------------------------- | |
| 55 // Data for the philosophers problem | |
| 56 | |
| 57 #define PHILOSOPHERS 15 // number of philosophers | |
| 58 #define STACKSIZE (2*1024) // size of thread stack | |
| 59 | |
| 60 // array of stacks for philosopher threads | |
| 61 char thread_stack[PHILOSOPHERS][STACKSIZE]; | |
| 62 | |
| 63 // array of threads. | |
| 64 cyg_thread thread[PHILOSOPHERS]; | |
| 65 | |
| 66 cyg_handle_t thread_handle[PHILOSOPHERS]; | |
| 67 | |
| 68 // array of chopsticks | |
| 69 cyg_sem_t chopstick[PHILOSOPHERS]; | |
| 70 | |
| 71 cyg_ucount32 data_index; | |
| 72 | |
| 73 // ------------------------------------------------------------------------- | |
| 74 // State recording and display | |
| 75 | |
| 76 static char pstate[PHILOSOPHERS+1]; // state vector showing what each | |
| 77 // philosopher is doing | |
| 78 | |
| 79 cyg_mutex_t state_mutex; | |
| 80 | |
| 81 #ifdef CYG_HAL_MN10300_MN103002 | |
| 82 static cyg_count8 eaters = 0; | |
| 83 #endif | |
| 84 | |
| 85 void change_state(int id, char newstate) | |
| 86 { | |
| 87 cyg_mutex_lock(&state_mutex); | |
| 88 | |
| 89 #ifdef CYG_HAL_MN10300_MN103002 | |
| 90 if( pstate[id] == 'E' ) eaters--; | |
| 91 if( newstate == 'E' ) eaters++; | |
| 92 // led(eaters); | |
| 93 #endif | |
| 94 | |
| 95 pstate[id] = newstate; | |
| 96 | |
| 97 diag_write_string(pstate); | |
| 98 #if 0 | |
| 99 diag_write_char(' '); | |
| 100 diag_write_dec(Cyg_Scheduler::get_thread_switches()); | |
| 101 #endif | |
| 102 diag_write_char('\n'); | |
| 103 | |
| 104 cyg_mutex_unlock(&state_mutex); | |
| 105 | |
| 106 } | |
| 107 | |
| 108 char get_state( int id) | |
| 109 { | |
| 110 char s; | |
| 111 cyg_mutex_lock(&state_mutex); | |
| 112 | |
| 113 s = pstate[id]; | |
| 114 | |
| 115 cyg_mutex_unlock(&state_mutex); | |
| 116 | |
| 117 return s; | |
| 118 } | |
| 119 | |
| 120 // ------------------------------------------------------------------------- | |
| 121 // Thread to behave like a philosopher | |
| 122 | |
| 123 void Philosopher( cyg_addrword_t vid ) | |
| 124 { | |
| 125 cyg_uint32 id = (cyg_uint32)vid; | |
| 126 cyg_sem_t *first_stick = &chopstick[id]; | |
| 127 cyg_sem_t *second_stick = &chopstick[(id+1)%PHILOSOPHERS]; | |
| 128 #ifdef CYGPKG_INFRA_DEBUG | |
| 129 int left_philo = ((id==0)?PHILOSOPHERS:id)-1; | |
| 130 int right_philo = (id==PHILOSOPHERS-1)?0:(id+1); | |
| 131 #endif | |
| 132 | |
| 133 CYG_ASSERT( id >= 0 && id < PHILOSOPHERS, "Bad id"); | |
| 134 | |
| 135 // Deadlock avoidance. The easiest way to make the philosophers | |
| 136 // behave is to make each pick up the lowest numbered stick | |
| 137 // first. This is how it works out anyway for all the philosophers | |
| 138 // except the last, who must have his sticks swapped. | |
| 139 | |
| 140 if( id == PHILOSOPHERS-1 ) | |
| 141 { | |
| 142 cyg_sem_t *t = first_stick; | |
| 143 first_stick = second_stick; | |
| 144 second_stick = t; | |
| 145 } | |
| 146 | |
| 147 for(;;) | |
| 148 { | |
| 149 cyg_ucount32 val; | |
| 150 | |
| 151 // The following variable is shared by all philosophers. | |
| 152 // It is incremented unprotected, but this does not matter | |
| 153 // since it is only present to introduce a little variability | |
| 154 // into the think and eat times. | |
| 155 | |
| 156 static volatile int cycle = 0; | |
| 157 | |
| 158 // Think for a bit | |
| 159 | |
| 160 cyg_thread_delay((id+cycle++)%12); // Cogito ergo sum... | |
| 161 | |
| 162 // I am now hungry, try to get the chopsticks | |
| 163 | |
| 164 change_state(id,'H'); | |
| 165 | |
| 166 // Get the first stick | |
| 167 cyg_semaphore_wait(first_stick); | |
| 168 | |
| 169 // Get the second stick | |
| 170 cyg_semaphore_wait(second_stick); | |
| 171 | |
| 172 // Got them, now eat | |
| 173 | |
| 174 change_state(id,'E'); | |
| 175 | |
| 176 // Check that the world is as I think it is... | |
| 177 cyg_semaphore_peek( first_stick, &val); | |
| 178 CYG_ASSERT( val == 0, "Not got first stick"); | |
| 179 cyg_semaphore_peek( second_stick, &val); | |
| 180 CYG_ASSERT( val == 0, "Not got second stick"); | |
| 181 CYG_ASSERT( get_state(left_philo) != 'E', "Left neighbour also eating!!"); | |
| 182 CYG_ASSERT( get_state(right_philo) != 'E', "Right neighbour also eating!!"); | |
| 183 | |
| 184 cyg_thread_delay((id+cycle++)%6); // munch munch | |
| 185 | |
| 186 // Finished eating, put down sticks. | |
| 187 | |
| 188 change_state(id,'T'); | |
| 189 | |
| 190 cyg_semaphore_post( first_stick ); | |
| 191 cyg_semaphore_post( second_stick ); | |
| 192 | |
| 193 } | |
| 194 } | |
| 195 | |
| 196 // ------------------------------------------------------------------------- | |
| 197 | |
| 198 externC void | |
| 199 cyg_start( void ) | |
| 200 { | |
| 201 int i; | |
| 202 | |
| 203 diag_init(); | |
| 204 | |
| 205 diag_write_string("Philosophers\n"); | |
| 206 diag_write_string("Started\n"); | |
| 207 | |
| 208 // Zero last element in state so it acts like | |
| 209 // a string. | |
| 210 pstate[PHILOSOPHERS] = 0; | |
| 211 | |
| 212 #if 1 | |
| 213 for( i = 0; i < PHILOSOPHERS; i++ ) | |
| 214 { | |
| 215 change_state(i,'T'); // starting state | |
| 216 | |
| 217 cyg_thread_create(4, Philosopher, (cyg_addrword_t)i, "philosopher", | |
| 218 (void *)(&thread_stack[i]), STACKSIZE, | |
| 219 &thread_handle[i], &thread[i]); | |
| 220 | |
| 221 // resume it | |
| 222 cyg_thread_resume(thread_handle[i]); | |
| 223 | |
| 224 // and make the matching chopstick present | |
| 225 cyg_semaphore_init( &chopstick[i], 1); | |
| 226 } | |
| 227 #endif | |
| 228 | |
| 229 // Get the world going | |
| 230 cyg_scheduler_start(); | |
| 231 | |
| 232 } | |
| 233 | |
| 234 // ------------------------------------------------------------------------- | |
| 235 // EOF kphilo.c |