[68003979] | 1 | /* |
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| 2 | * ptimer.c,v 1.1 1996/06/03 16:29:58 joel Exp |
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| 3 | */ |
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| 4 | |
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| 5 | #include <assert.h> |
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| 6 | #include <time.h> |
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| 7 | #include <errno.h> |
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| 8 | |
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| 9 | #include <rtems/system.h> |
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| 10 | #include <rtems/score/isr.h> |
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| 11 | #include <rtems/score/thread.h> |
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| 12 | #include <rtems/score/tod.h> |
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| 13 | |
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| 14 | #include <rtems/posix/time.h> |
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| 15 | |
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| 16 | /************************************/ |
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| 17 | /* These includes are now necessary */ |
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| 18 | /************************************/ |
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| 19 | |
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| 20 | #include <sys/features.h> |
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| 21 | #include <rtems/rtems/status.h> |
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| 22 | #include <rtems/rtems/types.h> |
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| 23 | #include <rtems/rtems/timer.h> |
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| 24 | #include <rtems/rtems/clock.h> |
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| 25 | #include <rtems/posix/psignal.h> |
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| 26 | #include <rtems/score/wkspace.h> |
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| 27 | #include <pthread.h> |
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| 28 | #include <stdio.h> |
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| 29 | #include <signal.h> |
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| 30 | |
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| 31 | #include <rtems/posix/timer.h> |
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| 32 | |
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| 33 | /*****************************/ |
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| 34 | /* End of necessary includes */ |
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| 35 | /*****************************/ |
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| 36 | |
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| 37 | /* ************ |
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| 38 | * Constants |
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| 39 | * ************/ |
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| 40 | |
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| 41 | /* |
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| 42 | #define DEBUG_MESSAGES |
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| 43 | */ |
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| 44 | |
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| 45 | /* |
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| 46 | * Data for the signals |
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| 47 | */ |
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| 48 | |
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| 49 | struct sigaction signal_inf[SIGRTMAX]; |
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| 50 | |
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| 51 | /*********************************** |
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| 52 | * Definition of Internal Functions |
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| 53 | ***********************************/ |
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| 54 | |
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| 55 | /* *************************************************************************** |
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| 56 | * PRINT_MSG_S |
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| 57 | * |
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| 58 | * Description: This function write a message in the display. |
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| 59 | * It is used for debugging and all the calls must be deleted |
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| 60 | * when the tests finish |
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| 61 | * ***************************************************************************/ |
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| 62 | |
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| 63 | static void PRINT_MSG_S ( char *msg ) |
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| 64 | { |
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| 65 | |
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| 66 | #ifdef DEBUG_MESSAGES |
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| 67 | printf("%s\n", msg); |
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| 68 | #endif |
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| 69 | |
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| 70 | } |
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| 71 | |
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| 72 | /* *************************************************************************** |
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| 73 | * PRINT_ERRNO_S |
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| 74 | * |
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| 75 | * Description: Print the value of the global variable errno in the display |
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| 76 | * ***************************************************************************/ |
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| 77 | |
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| 78 | static void PRINT_ERRNO_S () |
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| 79 | { |
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| 80 | #ifdef DEBUG_MESSAGES |
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| 81 | switch (errno) |
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| 82 | { |
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| 83 | case EINVAL: |
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| 84 | PRINT_MSG_S ( "errno EINVAL"); break; |
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| 85 | case EPERM: |
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| 86 | PRINT_MSG_S ( "errno EPERM"); break; |
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| 87 | case ESRCH: |
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| 88 | PRINT_MSG_S ( "errno ESRCH"); break; |
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| 89 | case EAGAIN: |
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| 90 | PRINT_MSG_S ( "errno EAGAIN"); break; |
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| 91 | default : |
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| 92 | printf ("errno: %d\n", errno); |
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| 93 | break; |
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| 94 | } |
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| 95 | #endif |
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| 96 | } |
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| 97 | |
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| 98 | /* *************************************************************************** |
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| 99 | * TIMER_INITIALIZE_S |
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| 100 | * |
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| 101 | * Description: Initialize the data of a timer |
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| 102 | * ***************************************************************************/ |
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| 103 | |
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[07e0743] | 104 | extern void TIMER_INITIALIZE_S ( int timer_pos ); |
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[68003979] | 105 | |
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| 106 | /* *************************************************************************** |
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| 107 | * _POSIX_Timer_Manager_initialization |
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| 108 | * |
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| 109 | * Description: Initialize the internal structure in which the data of all |
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| 110 | * the timers are stored |
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| 111 | * ***************************************************************************/ |
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| 112 | |
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| 113 | /* split to reduce minimum size */ |
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| 114 | |
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| 115 | /* *************************************************************************** |
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| 116 | * FIRST_FREE_POSITION_F |
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| 117 | * |
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| 118 | * Description: Returns the first free position in the table of timers. |
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| 119 | * If there is not a free position, it returns NO_MORE_TIMERS_C |
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| 120 | * ***************************************************************************/ |
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| 121 | |
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| 122 | int FIRST_FREE_POSITION_F () |
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| 123 | { |
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| 124 | int index; |
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| 125 | |
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| 126 | for (index=0; index<timer_max; index++) { |
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| 127 | if ( timer_struct[index].state == STATE_FREE_C ) { |
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| 128 | return index; |
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| 129 | } |
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| 130 | } |
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| 131 | |
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| 132 | /* The function reaches this point only if all the position are occupied */ |
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| 133 | |
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| 134 | return NO_MORE_TIMERS_C; |
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| 135 | } |
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| 136 | |
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| 137 | /* *************************************************************************** |
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| 138 | * TIMER_POSITION_F |
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| 139 | * |
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| 140 | * Description: Returns the position in the table of timers in which the |
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| 141 | * data of the timer are stored. |
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| 142 | * If the timer identifier does not exist, it returns |
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| 143 | * BAD_TIMER_C |
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| 144 | * ***************************************************************************/ |
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| 145 | |
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| 146 | int TIMER_POSITION_F ( timer_t timer_id ) |
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| 147 | { |
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| 148 | int index; |
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| 149 | |
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| 150 | for (index=0; index<timer_max; index++ ) { |
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| 151 | |
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| 152 | /* Looks for the position of the timer. The timer must exist and the |
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| 153 | * position can not be free */ |
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| 154 | if ( ( timer_struct[index].timer_id == timer_id ) && |
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| 155 | ( timer_struct[index].state != STATE_FREE_C ) ) { |
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| 156 | return index; |
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| 157 | } |
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| 158 | } |
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| 159 | |
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| 160 | /* If the function reaches this point is because the timer identifier |
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| 161 | * is not correct */ |
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| 162 | |
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| 163 | return BAD_TIMER_C; |
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| 164 | |
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| 165 | } |
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| 166 | |
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| 167 | /* *************************************************************************** |
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| 168 | * COPY_ITIMERSPEC_S |
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| 169 | * |
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| 170 | * Description: Does a copy of a variable of type struct itimerspec |
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| 171 | * ***************************************************************************/ |
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| 172 | |
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| 173 | void COPY_ITIMERSPEC_S ( const struct itimerspec *source, |
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| 174 | struct itimerspec *target ) |
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| 175 | { |
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| 176 | |
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| 177 | target->it_value.tv_sec = source->it_value.tv_sec; |
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| 178 | target->it_value.tv_nsec = source->it_value.tv_nsec; |
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| 179 | target->it_interval.tv_sec = source->it_interval.tv_sec; |
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| 180 | target->it_interval.tv_nsec = source->it_interval.tv_nsec; |
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| 181 | |
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| 182 | } |
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| 183 | |
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| 184 | /* *************************************************************************** |
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| 185 | * ITIMERSPEC_TO_RTEMS_TIME_OF_DAY_S |
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| 186 | * |
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| 187 | * Description: This function converts the data of a structure itimerspec |
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| 188 | * into structure rtems_time_of_day |
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| 189 | * ***************************************************************************/ |
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| 190 | |
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| 191 | void ITIMERSPEC_TO_RTEMS_TIME_OF_DAY_S |
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| 192 | ( const struct itimerspec *itimer, rtems_time_of_day *rtems_time ) |
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| 193 | { |
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| 194 | unsigned long int seconds; |
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| 195 | |
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| 196 | /* The leap years and the months with 28, 29 or 31 days have not been |
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| 197 | * considerated. It will be made in the future */ |
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| 198 | |
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| 199 | seconds = itimer->it_value.tv_sec; |
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| 200 | |
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| 201 | rtems_time->year = seconds / SECONDS_PER_YEAR_C; |
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| 202 | seconds = seconds % SECONDS_PER_YEAR_C; |
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| 203 | |
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| 204 | rtems_time->month = seconds / SECONDS_PER_MONTH_C; |
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| 205 | seconds = seconds % SECONDS_PER_MONTH_C; |
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| 206 | |
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| 207 | rtems_time->day = seconds / SECONDS_PER_DAY_C; |
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| 208 | seconds = seconds % SECONDS_PER_DAY_C; |
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| 209 | |
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| 210 | rtems_time->hour = seconds / SECONDS_PER_HOUR_C; |
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| 211 | seconds = seconds % SECONDS_PER_HOUR_C; |
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| 212 | |
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| 213 | rtems_time->minute = seconds / SECONDS_PER_MINUTE_C; |
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| 214 | seconds = seconds % SECONDS_PER_MINUTE_C; |
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| 215 | |
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| 216 | rtems_time->second = seconds; |
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| 217 | |
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| 218 | rtems_time->ticks = ( itimer->it_value.tv_nsec * SEC_TO_TICKS_C ) / |
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| 219 | NSEC_PER_SEC_C; |
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| 220 | |
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| 221 | } |
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| 222 | |
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| 223 | |
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| 224 | /* *************************************************************************** |
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| 225 | * FIRE_TIMER_S |
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| 226 | * |
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| 227 | * Description: This is the operation that is ran when a timer expires |
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| 228 | * ***************************************************************************/ |
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| 229 | |
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| 230 | |
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| 231 | rtems_timer_service_routine FIRE_TIMER_S (rtems_id timer, void *data) |
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| 232 | { |
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| 233 | int timer_pos; /* Position in the table of the timer that |
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| 234 | * has expirated */ |
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| 235 | rtems_status_code return_v; /* Return value of rtems_timer_fire_after */ |
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| 236 | int sig_number; /* Number of the signal to send */ |
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| 237 | |
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| 238 | |
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| 239 | /* The position of the table of timers that contains the data of the |
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| 240 | * expired timer will be stored in "timer_pos". In theory a timer can not |
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| 241 | * expire if it has not been created or has been deleted */ |
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| 242 | |
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| 243 | PRINT_MSG_S ("FIRE_TIMER_S"); |
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| 244 | |
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| 245 | timer_pos = TIMER_POSITION_F(timer); |
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| 246 | |
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| 247 | /* Increases the number of expiration of the timer in one unit. */ |
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| 248 | timer_struct[timer_pos].overrun = timer_struct[timer_pos].overrun + 1; |
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| 249 | |
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| 250 | |
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| 251 | if ( ( timer_struct[timer_pos].timer_data.it_interval.tv_sec != 0 ) || |
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| 252 | ( timer_struct[timer_pos].timer_data.it_interval.tv_nsec != 0 ) ) { |
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| 253 | |
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| 254 | /* The timer must be reprogrammed */ |
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| 255 | |
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| 256 | return_v = rtems_timer_fire_after ( timer, |
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| 257 | timer_struct[timer_pos].ticks, |
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| 258 | FIRE_TIMER_S, |
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| 259 | NULL ); |
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| 260 | |
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| 261 | /* Stores the time when the timer was started again */ |
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| 262 | |
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| 263 | return_v = rtems_clock_get ( RTEMS_CLOCK_GET_TOD, |
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| 264 | &timer_struct[timer_pos].time ); |
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| 265 | |
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| 266 | /* The state has not to be actualized, because nothing modifies it */ |
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| 267 | |
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| 268 | timer_struct[timer_pos].state = STATE_CREATE_RUN_C; |
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| 269 | |
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| 270 | } else { |
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| 271 | /* Indicates that the timer is stopped */ |
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| 272 | |
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| 273 | timer_struct[timer_pos].state = STATE_CREATE_STOP_C; |
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| 274 | |
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| 275 | } |
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| 276 | |
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| 277 | /* |
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| 278 | * The sending of the signal to the process running the handling function |
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| 279 | * specified for that signal is simulated |
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| 280 | */ |
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| 281 | |
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| 282 | sig_number = timer_struct[timer_pos].inf.sigev_signo; |
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| 283 | |
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| 284 | if( pthread_kill ( timer_struct[timer_pos].thread_id , |
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| 285 | timer_struct[timer_pos].inf.sigev_signo ) ) { |
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| 286 | PRINT_MSG_S ("ERROR_PTHREAD_KILL"); |
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| 287 | } else { |
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| 288 | PRINT_MSG_S ("SUCCESS_PTHREAD_KILL"); |
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| 289 | } |
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| 290 | |
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| 291 | /* |
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| 292 | * After the signal handler returns, the count of expirations of the |
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| 293 | * timer must be set to 0. |
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| 294 | */ |
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| 295 | |
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| 296 | timer_struct[timer_pos].overrun = 0; |
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| 297 | |
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| 298 | } |
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| 299 | |
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| 300 | /* ********************************************************************* |
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| 301 | * 14.2.2 Create a Per-Process Timer, P1003.1b-1993, p. 264 |
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| 302 | * ********************************************************************/ |
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| 303 | |
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| 304 | /* ************** |
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| 305 | * timer_create |
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| 306 | * **************/ |
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| 307 | |
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| 308 | int timer_create( |
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| 309 | clockid_t clock_id, |
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| 310 | struct sigevent *evp, |
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| 311 | timer_t *timerid |
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| 312 | ) |
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| 313 | { |
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| 314 | |
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| 315 | rtems_status_code return_v; /* return value of the operation */ |
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| 316 | rtems_id timer_id; /* created timer identifier */ |
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| 317 | int timer_pos; /* Position in the table of timers */ |
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| 318 | |
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| 319 | /* |
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| 320 | * The data of the structure evp are checked in order to verify if they |
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| 321 | * are coherent. |
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| 322 | */ |
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| 323 | |
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| 324 | if (evp != NULL) { |
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| 325 | /* The structure has data */ |
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| 326 | |
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| 327 | if ( ( evp->sigev_notify != SIGEV_NONE ) && |
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| 328 | ( evp->sigev_notify != SIGEV_SIGNAL ) ) { |
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| 329 | /* The value of the field sigev_notify is not valid */ |
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| 330 | |
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| 331 | return (-1); |
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| 332 | |
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| 333 | } |
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| 334 | } |
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| 335 | |
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| 336 | /* |
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| 337 | * A timer is created using the primitive rtems_timer_create |
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| 338 | */ |
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| 339 | |
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| 340 | return_v = rtems_timer_create ( clock_id, &timer_id ); |
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| 341 | |
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| 342 | switch (return_v) { |
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| 343 | case RTEMS_SUCCESSFUL : |
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| 344 | |
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| 345 | PRINT_MSG_S("SUCCESS: rtems create timer RTEMS_SUCCESSFUL"); |
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| 346 | |
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| 347 | /* |
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| 348 | * The timer has been created properly |
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| 349 | */ |
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| 350 | |
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| 351 | /* Obtains the first free position in the table of timers */ |
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| 352 | |
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| 353 | timer_pos = FIRST_FREE_POSITION_F(); |
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| 354 | |
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| 355 | if ( timer_pos == NO_MORE_TIMERS_C ) { |
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| 356 | /* There is not position for another timers in spite of RTEMS |
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| 357 | * supports it. It will necessaty to increase the structure used */ |
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| 358 | |
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| 359 | errno = EAGAIN; |
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| 360 | |
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| 361 | return -1; |
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| 362 | } |
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| 363 | |
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| 364 | /* Exit parameter */ |
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| 365 | |
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| 366 | *timerid = timer_id; |
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| 367 | |
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| 368 | /* The data of the created timer are stored to use them later */ |
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| 369 | |
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| 370 | timer_struct[timer_pos].state = STATE_CREATE_NEW_C; |
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| 371 | |
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| 372 | /* NEW VERSION*/ |
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| 373 | timer_struct[timer_pos].thread_id = pthread_self (); |
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| 374 | |
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| 375 | |
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| 376 | if ( evp != NULL ) { |
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| 377 | |
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| 378 | timer_struct[timer_pos].inf.sigev_notify = evp->sigev_notify; |
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| 379 | timer_struct[timer_pos].inf.sigev_signo = evp->sigev_signo; |
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| 380 | timer_struct[timer_pos].inf.sigev_value = evp->sigev_value; |
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| 381 | |
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| 382 | } |
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| 383 | |
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| 384 | |
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| 385 | timer_struct[timer_pos].timer_id = timer_id; |
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| 386 | |
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| 387 | timer_struct[timer_pos].overrun = 0; |
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| 388 | |
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| 389 | timer_struct[timer_pos].timer_data.it_value.tv_sec = 0; |
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| 390 | timer_struct[timer_pos].timer_data.it_value.tv_nsec = 0; |
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| 391 | timer_struct[timer_pos].timer_data.it_interval.tv_sec = 0; |
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| 392 | timer_struct[timer_pos].timer_data.it_interval.tv_nsec = 0; |
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| 393 | |
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| 394 | return 0; |
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| 395 | |
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| 396 | |
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| 397 | case RTEMS_INVALID_NAME : /* The assigned name is not valid*/ |
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| 398 | |
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| 399 | PRINT_MSG_S ("ERROR: rtems create timer RTEMS_INVALID_NAME"); |
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| 400 | |
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| 401 | errno = EINVAL; |
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| 402 | |
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| 403 | return (-1); |
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| 404 | |
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| 405 | |
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| 406 | case RTEMS_TOO_MANY : |
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| 407 | |
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| 408 | PRINT_MSG_S ("ERROR: rtems create timer RTEMS_TOO_MANY "); |
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| 409 | |
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| 410 | /* There has been created too much timers for the same process */ |
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| 411 | |
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| 412 | errno = EAGAIN; |
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| 413 | |
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| 414 | return (-1); |
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| 415 | |
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| 416 | default : |
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| 417 | |
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| 418 | /* |
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| 419 | * Does nothing. It only returns the error without assigning a value |
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| 420 | * to errno. In theory, it can not happen because the call to |
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| 421 | * rtems_timer_create can not return other different value. |
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| 422 | */ |
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| 423 | |
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| 424 | return (-1); |
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| 425 | |
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| 426 | } |
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| 427 | |
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| 428 | /* |
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| 429 | * The next sentence is used to avoid singular situations |
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| 430 | */ |
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| 431 | |
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| 432 | return (-1); |
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| 433 | |
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| 434 | } |
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| 435 | |
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| 436 | /* |
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| 437 | * 14.2.3 Delete a Per_process Timer, P1003.1b-1993, p. 266 |
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| 438 | */ |
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| 439 | |
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| 440 | int timer_delete( |
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| 441 | timer_t timerid |
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| 442 | ) |
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| 443 | { |
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| 444 | |
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| 445 | /* |
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| 446 | * IDEA: This function must probably stop the timer first and then delete it |
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| 447 | * |
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| 448 | * It will have to do a call to rtems_timer_cancel and then another |
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| 449 | * call to rtems_timer_delete. |
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| 450 | * The call to rtems_timer_delete will be probably unnecessary, |
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| 451 | * because rtems_timer_delete stops the timer before deleting it. |
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| 452 | */ |
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| 453 | |
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| 454 | int timer_pos; |
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| 455 | rtems_status_code status; |
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| 456 | |
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| 457 | |
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| 458 | /* First the position in the table of timers is obtained */ |
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| 459 | |
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| 460 | timer_pos = TIMER_POSITION_F ( timerid ); |
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| 461 | |
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| 462 | if ( timer_pos == BAD_TIMER_C ) { |
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| 463 | /* The timer identifier is erroneus */ |
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| 464 | |
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| 465 | errno = EINVAL; |
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| 466 | return -1; |
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| 467 | } |
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| 468 | |
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| 469 | /* The timer is deleted */ |
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| 470 | |
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| 471 | status = rtems_timer_delete ( timerid ); |
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| 472 | |
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| 473 | if ( status == RTEMS_INVALID_ID ) { |
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| 474 | /* The timer identifier is erroneus */ |
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| 475 | |
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| 476 | errno = EINVAL; |
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| 477 | return -1; |
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| 478 | } |
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| 479 | |
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| 480 | /* Initializes the data of the timer */ |
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| 481 | |
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| 482 | TIMER_INITIALIZE_S ( timer_pos ); |
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| 483 | |
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| 484 | return 0; |
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| 485 | } |
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| 486 | |
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| 487 | /* |
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| 488 | * 14.2.4 Per-Process Timers, P1003.1b-1993, p. 267 |
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| 489 | */ |
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| 490 | |
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| 491 | /* ************** |
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| 492 | * timer_settime |
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| 493 | * **************/ |
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| 494 | |
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| 495 | |
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| 496 | int timer_settime( |
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| 497 | timer_t timerid, |
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| 498 | int flags, |
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| 499 | const struct itimerspec *value, |
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| 500 | struct itimerspec *ovalue |
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| 501 | ) |
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| 502 | { |
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| 503 | |
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| 504 | rtems_status_code return_v; /* Return of the calls to RTEMS */ |
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| 505 | int timer_pos; /* Position of the timer in the table */ |
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| 506 | rtems_time_of_day rtems_time; /* Time in RTEMS */ |
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| 507 | |
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| 508 | |
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| 509 | /* First the position in the table of timers is obtained */ |
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| 510 | |
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| 511 | timer_pos = TIMER_POSITION_F ( timerid ); |
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| 512 | |
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| 513 | if ( timer_pos == BAD_TIMER_C ) { |
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| 514 | /* The timer identifier is erroneus */ |
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| 515 | |
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| 516 | errno = EINVAL; |
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| 517 | return -1; |
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| 518 | } |
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| 519 | |
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| 520 | if ( value == NULL ) { |
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| 521 | /* The stucture of times of the timer is free, and then returns an |
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| 522 | error but the variable errno is not actualized */ |
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| 523 | |
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| 524 | /* errno = ?????? */ |
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| 525 | |
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| 526 | return -1; |
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| 527 | } |
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| 528 | |
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| 529 | /* If the function reaches this point, then it will be necessary to do |
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| 530 | * something with the structure of times of the timer: to stop, start |
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| 531 | * or start it again */ |
---|
| 532 | |
---|
| 533 | /* First, it verifies if the timer must be stopped */ |
---|
| 534 | |
---|
| 535 | if ( value->it_value.tv_sec == 0 && value->it_value.tv_nsec == 0 ) { |
---|
| 536 | /* The timer is stopped */ |
---|
| 537 | |
---|
| 538 | return_v = rtems_timer_cancel ( timerid ); |
---|
| 539 | |
---|
| 540 | /* The old data of the timer are returned */ |
---|
| 541 | |
---|
| 542 | if ( ovalue ) |
---|
| 543 | COPY_ITIMERSPEC_S ( &timer_struct[timer_pos].timer_data, ovalue ); |
---|
| 544 | |
---|
| 545 | /* The new data are set */ |
---|
| 546 | |
---|
| 547 | COPY_ITIMERSPEC_S ( value, &timer_struct[timer_pos].timer_data ); |
---|
| 548 | |
---|
| 549 | /* Indicates that the timer is created and stopped */ |
---|
| 550 | |
---|
| 551 | timer_struct[timer_pos].state = STATE_CREATE_STOP_C; |
---|
| 552 | |
---|
| 553 | /* Returns with success */ |
---|
| 554 | |
---|
| 555 | return 0; |
---|
| 556 | } |
---|
| 557 | |
---|
| 558 | /* |
---|
| 559 | * If the function reaches this point, then the timer will have to be |
---|
| 560 | * initialized with new values: to start it or start it again |
---|
| 561 | */ |
---|
| 562 | |
---|
| 563 | /* First, it verifies if the structure "value" is correct */ |
---|
| 564 | |
---|
| 565 | if ( ( value->it_value.tv_nsec > MAX_NSEC_C ) || |
---|
| 566 | ( value->it_value.tv_nsec < MIN_NSEC_C ) ) { |
---|
| 567 | /* The number of nanoseconds is not correct */ |
---|
| 568 | |
---|
| 569 | errno = EINVAL; |
---|
| 570 | |
---|
| 571 | return -1; |
---|
| 572 | } |
---|
| 573 | |
---|
| 574 | /* Then, "value" must be converted from seconds and nanoseconds to clock |
---|
| 575 | * ticks, to use it in the calls to RTEMS */ |
---|
| 576 | |
---|
| 577 | /* It is also necessary to take in account if the time is absolute |
---|
| 578 | * or relative */ |
---|
| 579 | |
---|
| 580 | switch (flags) { |
---|
| 581 | case TIMER_ABSTIME: |
---|
| 582 | |
---|
| 583 | /* The fire time is absolute: |
---|
| 584 | * It has to use "rtems_time_fire_when" */ |
---|
| 585 | |
---|
| 586 | /* First, it converts from struct itimerspec to rtems_time_of_day */ |
---|
| 587 | |
---|
| 588 | ITIMERSPEC_TO_RTEMS_TIME_OF_DAY_S ( value, &rtems_time ); |
---|
| 589 | |
---|
| 590 | return_v = rtems_timer_fire_when ( timerid, &rtems_time, FIRE_TIMER_S, NULL); |
---|
| 591 | |
---|
| 592 | switch ( return_v ) { |
---|
| 593 | case RTEMS_SUCCESSFUL: |
---|
| 594 | |
---|
| 595 | PRINT_MSG_S ("SUCCESS: timer_settime RTEMS_SUCCESSFUL"); |
---|
| 596 | |
---|
| 597 | /* The timer has been started and is running */ |
---|
| 598 | |
---|
| 599 | /* Actualizes the data of the structure and |
---|
| 600 | * returns the old ones in "ovalue" */ |
---|
| 601 | |
---|
| 602 | if ( ovalue ) |
---|
| 603 | COPY_ITIMERSPEC_S ( &timer_struct[timer_pos].timer_data, ovalue ); |
---|
| 604 | |
---|
| 605 | COPY_ITIMERSPEC_S ( value, &timer_struct[timer_pos].timer_data ); |
---|
| 606 | |
---|
| 607 | /* It indicates that the time is running */ |
---|
| 608 | |
---|
| 609 | timer_struct[timer_pos].state = STATE_CREATE_RUN_C; |
---|
| 610 | |
---|
| 611 | /* Stores the time in which the timer was started again */ |
---|
| 612 | |
---|
| 613 | return_v = rtems_clock_get ( RTEMS_CLOCK_GET_TOD, |
---|
| 614 | &timer_struct[timer_pos].time ); |
---|
| 615 | |
---|
| 616 | return 0; |
---|
| 617 | |
---|
| 618 | break; |
---|
| 619 | |
---|
| 620 | case RTEMS_INVALID_ID: |
---|
| 621 | |
---|
| 622 | PRINT_MSG_S ("ERROR: timer_settime RTEMS_INVALID_ID"); |
---|
| 623 | break; |
---|
| 624 | |
---|
| 625 | case RTEMS_NOT_DEFINED: |
---|
| 626 | |
---|
| 627 | PRINT_MSG_S ("ERROR: timer_settime RTEMS_NOT_DEFINED"); |
---|
| 628 | break; |
---|
| 629 | |
---|
| 630 | case RTEMS_INVALID_CLOCK: |
---|
| 631 | |
---|
| 632 | PRINT_MSG_S ("ERROR: timer_settime RTEMS_INVALID_CLOCK"); |
---|
| 633 | break; |
---|
| 634 | |
---|
| 635 | default: |
---|
| 636 | |
---|
| 637 | |
---|
| 638 | } |
---|
| 639 | |
---|
| 640 | break; |
---|
| 641 | |
---|
| 642 | case TIMER_RELATIVE_C: |
---|
| 643 | |
---|
| 644 | /* The fire time is relative: |
---|
| 645 | * It has to use "rtems_time_fire_after" */ |
---|
| 646 | |
---|
| 647 | /* First, it converts from seconds and nanoseconds to ticks */ |
---|
| 648 | |
---|
| 649 | /* The form in which this operation is done can produce a lost |
---|
| 650 | * of precision of 1 second */ |
---|
| 651 | |
---|
| 652 | /* This is the process to convert from nanoseconds to ticks |
---|
| 653 | * |
---|
| 654 | * There is a tick every 10 miliseconds, then the nanoseconds are |
---|
| 655 | * divided between 10**7. The result of this operation will be the |
---|
| 656 | * number of ticks |
---|
| 657 | */ |
---|
| 658 | |
---|
| 659 | timer_struct[timer_pos].ticks = |
---|
| 660 | ( SEC_TO_TICKS_C * value->it_value.tv_sec ) + |
---|
| 661 | ( value->it_value.tv_nsec / ( 1000 * 1000 * 10 ) ); |
---|
| 662 | |
---|
| 663 | return_v = rtems_timer_fire_after ( timerid, |
---|
| 664 | timer_struct[timer_pos].ticks, |
---|
| 665 | FIRE_TIMER_S, |
---|
| 666 | NULL ); |
---|
| 667 | |
---|
| 668 | switch (return_v) { |
---|
| 669 | case RTEMS_SUCCESSFUL: |
---|
| 670 | |
---|
| 671 | PRINT_MSG_S ( "SUCCESS: timer_settime RTEMS_SUCCESSFUL"); |
---|
| 672 | |
---|
| 673 | /* The timer has been started and is running */ |
---|
| 674 | |
---|
| 675 | /* Actualizes the data of the structure and |
---|
| 676 | * returns the old ones in "ovalue" */ |
---|
| 677 | |
---|
| 678 | if ( ovalue ) |
---|
| 679 | COPY_ITIMERSPEC_S ( &timer_struct[timer_pos].timer_data, ovalue ); |
---|
| 680 | |
---|
| 681 | COPY_ITIMERSPEC_S ( value, &timer_struct[timer_pos].timer_data ); |
---|
| 682 | |
---|
| 683 | /* It indicates that the time is running */ |
---|
| 684 | |
---|
| 685 | timer_struct[timer_pos].state = STATE_CREATE_RUN_C; |
---|
| 686 | |
---|
| 687 | /* Stores the time in which the timer was started again */ |
---|
| 688 | |
---|
| 689 | return_v = rtems_clock_get ( RTEMS_CLOCK_GET_TOD, |
---|
| 690 | &timer_struct[timer_pos].time ); |
---|
| 691 | |
---|
| 692 | return 0; |
---|
| 693 | |
---|
| 694 | break; |
---|
| 695 | |
---|
| 696 | case RTEMS_INVALID_ID: |
---|
| 697 | |
---|
| 698 | PRINT_MSG_S ( "ERROR: timer_settime RTEMS_INVALID_ID"); |
---|
| 699 | |
---|
| 700 | /* The timer identifier is not correct. In theory, this |
---|
| 701 | * situation can not occur, but the solution is easy */ |
---|
| 702 | |
---|
| 703 | errno = EINVAL; |
---|
| 704 | |
---|
| 705 | return -1; |
---|
| 706 | |
---|
| 707 | break; |
---|
| 708 | |
---|
| 709 | case RTEMS_INVALID_NUMBER: |
---|
| 710 | |
---|
| 711 | PRINT_MSG_S ( "ERROR: timer_settime RTEMS_INVALID_NUMBER"); |
---|
| 712 | |
---|
| 713 | /* In this case, RTEMS fails because the values of timing |
---|
| 714 | * are incorrect */ |
---|
| 715 | |
---|
| 716 | /* |
---|
| 717 | * I do not know if errno must be actualized |
---|
| 718 | * |
---|
| 719 | * errno = EINVAL; |
---|
| 720 | */ |
---|
| 721 | |
---|
| 722 | return -1; |
---|
| 723 | |
---|
| 724 | break; |
---|
| 725 | |
---|
| 726 | default: |
---|
| 727 | } |
---|
| 728 | |
---|
| 729 | break; |
---|
| 730 | |
---|
| 731 | default: |
---|
| 732 | |
---|
| 733 | /* It does nothing, although it will be probably necessary to |
---|
| 734 | * return an error */ |
---|
| 735 | |
---|
| 736 | } |
---|
| 737 | |
---|
| 738 | /* To avoid problems */ |
---|
| 739 | |
---|
| 740 | return 0; |
---|
| 741 | |
---|
| 742 | } |
---|
| 743 | |
---|
| 744 | |
---|
| 745 | /* |
---|
| 746 | * 14.2.4 Per-Process Timers, P1003.1b-1993, p. 267 |
---|
| 747 | */ |
---|
| 748 | |
---|
| 749 | /* ************** |
---|
| 750 | * timer_gettime |
---|
| 751 | * **************/ |
---|
| 752 | |
---|
| 753 | int timer_gettime( |
---|
| 754 | timer_t timerid, |
---|
| 755 | struct itimerspec *value |
---|
| 756 | ) |
---|
| 757 | { |
---|
| 758 | |
---|
| 759 | /* |
---|
| 760 | * IDEA: This function does not use functions of RTEMS to the handle |
---|
| 761 | * of timers. It uses some functions for managing the time. |
---|
| 762 | * |
---|
| 763 | * A possible form to do this is the following: |
---|
| 764 | * |
---|
| 765 | * - When a timer is initialized, the value of the time in |
---|
| 766 | * that moment is stored. |
---|
| 767 | * - When this function is called, it returns the difference |
---|
| 768 | * between the current time and the initialization time. |
---|
| 769 | */ |
---|
| 770 | |
---|
| 771 | rtems_time_of_day current_time; |
---|
| 772 | rtems_status_code return_v; |
---|
| 773 | int timer_pos; |
---|
| 774 | unsigned32 hours; |
---|
| 775 | unsigned32 minutes; |
---|
| 776 | unsigned32 seconds; |
---|
| 777 | unsigned32 ticks; |
---|
| 778 | unsigned32 nanosec; |
---|
| 779 | |
---|
| 780 | |
---|
| 781 | /* Reads the current time */ |
---|
| 782 | |
---|
| 783 | return_v = rtems_clock_get ( RTEMS_CLOCK_GET_TOD, ¤t_time ); |
---|
| 784 | |
---|
| 785 | timer_pos = TIMER_POSITION_F ( timerid ); |
---|
| 786 | |
---|
| 787 | if ( timer_pos == BAD_TIMER_C ) { |
---|
| 788 | |
---|
| 789 | /* The timer identifier is erroneus */ |
---|
| 790 | |
---|
| 791 | errno = EINVAL; |
---|
| 792 | |
---|
| 793 | return (-1); |
---|
| 794 | |
---|
| 795 | } |
---|
| 796 | |
---|
| 797 | /* Calculates the difference between the start time of the timer and |
---|
| 798 | * the current one */ |
---|
| 799 | |
---|
| 800 | hours = current_time.hour - timer_struct[timer_pos].time.hour; |
---|
| 801 | |
---|
| 802 | if ( current_time.minute < timer_struct[timer_pos].time.minute ) { |
---|
| 803 | minutes = 60 - timer_struct[timer_pos].time.minute + current_time.minute; |
---|
| 804 | hours--; |
---|
| 805 | } else { |
---|
| 806 | minutes = current_time.minute - timer_struct[timer_pos].time.minute; |
---|
| 807 | } |
---|
| 808 | |
---|
| 809 | if ( current_time.second < timer_struct[timer_pos].time.second ) { |
---|
| 810 | seconds = 60 - timer_struct[timer_pos].time.second + current_time.second; |
---|
| 811 | minutes--; |
---|
| 812 | } else { |
---|
| 813 | seconds = current_time.second - timer_struct[timer_pos].time.second; |
---|
| 814 | } |
---|
| 815 | |
---|
| 816 | if ( current_time.ticks < timer_struct[timer_pos].time.ticks ) { |
---|
| 817 | ticks = 100 - timer_struct[timer_pos].time.ticks + current_time.ticks; |
---|
| 818 | seconds--; |
---|
| 819 | } else { |
---|
| 820 | ticks = current_time.ticks - timer_struct[timer_pos].time.ticks; |
---|
| 821 | } |
---|
| 822 | |
---|
| 823 | /* The time that the timer is running is calculated */ |
---|
| 824 | seconds = hours * 60 * 60 + |
---|
| 825 | minutes * 60 + |
---|
| 826 | seconds; |
---|
| 827 | |
---|
| 828 | nanosec = ticks * 10 * /* msec */ |
---|
| 829 | 1000 * /* microsec */ |
---|
| 830 | 1000; /* nanosec */ |
---|
| 831 | |
---|
| 832 | |
---|
| 833 | /* Calculates the time left before the timer finishes */ |
---|
| 834 | |
---|
| 835 | value->it_value.tv_sec = |
---|
| 836 | timer_struct[timer_pos].timer_data.it_value.tv_sec - seconds; |
---|
| 837 | |
---|
| 838 | value->it_value.tv_nsec = |
---|
| 839 | timer_struct[timer_pos].timer_data.it_value.tv_nsec - nanosec; |
---|
| 840 | |
---|
| 841 | |
---|
| 842 | value->it_interval.tv_sec = |
---|
| 843 | timer_struct[timer_pos].timer_data.it_interval.tv_sec; |
---|
| 844 | value->it_interval.tv_nsec = |
---|
| 845 | timer_struct[timer_pos].timer_data.it_interval.tv_nsec; |
---|
| 846 | |
---|
| 847 | |
---|
| 848 | return 0; |
---|
| 849 | |
---|
| 850 | } |
---|
| 851 | |
---|
| 852 | /* |
---|
| 853 | * 14.2.4 Per-Process Timers, P1003.1b-1993, p. 267 |
---|
| 854 | */ |
---|
| 855 | |
---|
| 856 | /* ***************** |
---|
| 857 | * timer_getoverrun |
---|
| 858 | * *****************/ |
---|
| 859 | |
---|
| 860 | int timer_getoverrun( |
---|
| 861 | timer_t timerid |
---|
| 862 | ) |
---|
| 863 | { |
---|
| 864 | |
---|
| 865 | /* |
---|
| 866 | * IDEA: This function must count the times the timer expires. |
---|
| 867 | * |
---|
| 868 | * The expiration of a timer must increase by one a counter. |
---|
| 869 | * After the signal handler associated to the timer finishs |
---|
| 870 | * its execution, FIRE_TIMER_S will have to set this counter to 0. |
---|
| 871 | */ |
---|
| 872 | |
---|
| 873 | int timer_pos; /* Position of the timer in the structure */ |
---|
| 874 | int overrun; /* Overflow count */ |
---|
| 875 | |
---|
| 876 | |
---|
| 877 | timer_pos = TIMER_POSITION_F ( timerid ); |
---|
| 878 | |
---|
| 879 | if ( timer_pos == BAD_TIMER_C ) { |
---|
| 880 | /* The timer identifier is erroneus */ |
---|
| 881 | |
---|
| 882 | errno = EINVAL; |
---|
| 883 | |
---|
| 884 | return -1; |
---|
| 885 | } |
---|
| 886 | |
---|
| 887 | /* The overflow count of the timer is stored in "overrun" */ |
---|
| 888 | |
---|
| 889 | overrun = timer_struct[timer_pos].overrun; |
---|
| 890 | |
---|
| 891 | /* It is set to 0 */ |
---|
| 892 | |
---|
| 893 | timer_struct[timer_pos].overrun = 0; |
---|
| 894 | |
---|
| 895 | return overrun; |
---|
| 896 | |
---|
| 897 | } |
---|