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 | #if HAVE_CONFIG_H |
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6 | #include "config.h" |
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7 | #endif |
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8 | |
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9 | #include <time.h> |
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10 | #include <errno.h> |
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11 | |
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12 | #include <rtems/system.h> |
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13 | #include <rtems/score/isr.h> |
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14 | #include <rtems/score/thread.h> |
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15 | #include <rtems/score/tod.h> |
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16 | |
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17 | #include <rtems/posix/time.h> |
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18 | |
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19 | /************************************/ |
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20 | /* These includes are now necessary */ |
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21 | /************************************/ |
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22 | |
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23 | #include <unistd.h> |
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24 | #include <rtems/rtems/status.h> |
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25 | #include <rtems/rtems/types.h> |
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26 | #include <rtems/rtems/timer.h> |
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27 | #include <rtems/rtems/clock.h> |
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28 | #include <rtems/posix/psignal.h> |
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29 | #include <pthread.h> |
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30 | #include <stdio.h> |
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31 | #include <signal.h> |
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32 | |
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33 | #include <rtems/seterr.h> |
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34 | #include <rtems/posix/timer.h> |
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35 | |
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36 | boolean _Watchdog_Insert_ticks_helper( |
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37 | Watchdog_Control *timer, |
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38 | Watchdog_Interval ticks, |
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39 | Objects_Id id, |
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40 | Watchdog_Service_routine_entry TSR, |
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41 | void *arg |
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42 | ) |
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43 | { |
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44 | ISR_Level level; |
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45 | |
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46 | (void) _Watchdog_Remove( timer ); |
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47 | _ISR_Disable( level ); |
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48 | |
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49 | /* |
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50 | * Check to see if the watchdog has just been inserted by a |
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51 | * higher priority interrupt. If so, abandon this insert. |
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52 | */ |
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53 | if ( timer->state != WATCHDOG_INACTIVE ) { |
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54 | _ISR_Enable( level ); |
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55 | return FALSE; |
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56 | } |
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57 | |
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58 | /* |
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59 | * OK. Now we now the timer was not rescheduled by an interrupt |
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60 | * so we can atomically initialize it as in use. |
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61 | */ |
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62 | _Watchdog_Initialize( timer, TSR, id, arg ); |
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63 | _Watchdog_Insert_ticks( timer, ticks ); |
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64 | _ISR_Enable( level ); |
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65 | return TRUE; |
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66 | } |
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67 | |
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68 | /* #define DEBUG_MESSAGES */ |
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69 | |
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70 | /* |
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71 | * ITIMERSPEC_TO_RTEMS_TIME_OF_DAY_S |
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72 | * |
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73 | * Description: This function converts the data of a structure itimerspec |
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74 | * into structure rtems_time_of_day |
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75 | */ |
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76 | |
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77 | void ITIMERSPEC_TO_RTEMS_TIME_OF_DAY_S( |
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78 | const struct itimerspec *itimer, |
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79 | rtems_time_of_day *rtems_time |
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80 | ) |
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81 | { |
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82 | unsigned long int seconds; |
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83 | |
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84 | /* The leap years and the months with 28, 29 or 31 days have not been |
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85 | * considered. It will be made in the future */ |
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86 | |
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87 | seconds = itimer->it_value.tv_sec; |
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88 | |
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89 | rtems_time->year = seconds / SECONDS_PER_YEAR_C; |
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90 | seconds = seconds % SECONDS_PER_YEAR_C; |
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91 | |
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92 | rtems_time->month = seconds / SECONDS_PER_MONTH_C; |
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93 | seconds = seconds % SECONDS_PER_MONTH_C; |
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94 | |
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95 | rtems_time->day = seconds / SECONDS_PER_DAY_C; |
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96 | seconds = seconds % SECONDS_PER_DAY_C; |
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97 | |
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98 | rtems_time->hour = seconds / SECONDS_PER_HOUR_C; |
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99 | seconds = seconds % SECONDS_PER_HOUR_C; |
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100 | |
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101 | rtems_time->minute = seconds / SECONDS_PER_MINUTE_C; |
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102 | seconds = seconds % SECONDS_PER_MINUTE_C; |
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103 | |
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104 | rtems_time->second = seconds; |
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105 | |
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106 | rtems_time->ticks = itimer->it_value.tv_nsec/ |
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107 | (NSEC_PER_SEC_C / SEC_TO_TICKS_C); |
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108 | |
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109 | } |
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110 | |
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111 | |
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112 | /* *************************************************************************** |
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113 | * _POSIX_Timer_TSR |
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114 | * |
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115 | * Description: This is the operation that is ran when a timer expires |
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116 | * ***************************************************************************/ |
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117 | |
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118 | |
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119 | void _POSIX_Timer_TSR(Objects_Id timer, void *data) |
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120 | { |
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121 | POSIX_Timer_Control *ptimer; |
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122 | boolean activated; |
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123 | |
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124 | ptimer = (POSIX_Timer_Control *)data; |
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125 | |
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126 | /* Increment the number of expirations. */ |
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127 | ptimer->overrun = ptimer->overrun + 1; |
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128 | /* The timer must be reprogrammed */ |
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129 | if ( ( ptimer->timer_data.it_interval.tv_sec != 0 ) || |
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130 | ( ptimer->timer_data.it_interval.tv_nsec != 0 ) ) { |
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131 | #if 0 |
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132 | status = rtems_timer_fire_after( |
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133 | ptimer->timer_id, ptimer->ticks, _POSIX_Timer_TSR, ptimer ); |
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134 | #endif |
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135 | activated = _Watchdog_Insert_ticks_helper( |
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136 | &ptimer->Timer, |
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137 | ptimer->ticks, |
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138 | ptimer->Object.id, |
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139 | _POSIX_Timer_TSR, |
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140 | ptimer |
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141 | ); |
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142 | if ( !activated ) |
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143 | return; |
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144 | |
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145 | /* Store the time when the timer was started again */ |
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146 | ptimer->time = _TOD_Current; |
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147 | |
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148 | /* The state really did not change but just to be safe */ |
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149 | ptimer->state = STATE_CREATE_RUN_C; |
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150 | } else { |
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151 | /* Indicates that the timer is stopped */ |
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152 | ptimer->state = STATE_CREATE_STOP_C; |
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153 | } |
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154 | |
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155 | /* |
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156 | * The sending of the signal to the process running the handling function |
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157 | * specified for that signal is simulated |
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158 | */ |
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159 | |
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160 | if ( pthread_kill ( ptimer->thread_id, ptimer->inf.sigev_signo ) ) { |
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161 | /* XXX error handling */ |
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162 | } |
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163 | |
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164 | /* After the signal handler returns, the count of expirations of the |
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165 | * timer must be set to 0. |
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166 | */ |
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167 | ptimer->overrun = 0; |
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168 | } |
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169 | |
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170 | /* ********************************************************************* |
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171 | * 14.2.2 Create a Per-Process Timer, P1003.1b-1993, p. 264 |
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172 | * ********************************************************************/ |
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173 | |
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174 | /* ************** |
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175 | * timer_create |
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176 | * **************/ |
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177 | |
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178 | int timer_create( |
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179 | clockid_t clock_id, |
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180 | struct sigevent *evp, |
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181 | timer_t *timerid |
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182 | ) |
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183 | { |
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184 | POSIX_Timer_Control *ptimer; |
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185 | |
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186 | if ( clock_id != CLOCK_REALTIME ) |
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187 | rtems_set_errno_and_return_minus_one( EINVAL ); |
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188 | |
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189 | /* |
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190 | * The data of the structure evp are checked in order to verify if they |
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191 | * are coherent. |
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192 | */ |
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193 | |
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194 | if (evp != NULL) { |
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195 | /* The structure has data */ |
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196 | if ( ( evp->sigev_notify != SIGEV_NONE ) && |
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197 | ( evp->sigev_notify != SIGEV_SIGNAL ) ) { |
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198 | /* The value of the field sigev_notify is not valid */ |
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199 | rtems_set_errno_and_return_minus_one( EINVAL ); |
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200 | } |
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201 | |
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202 | if ( !evp->sigev_signo ) |
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203 | rtems_set_errno_and_return_minus_one( EINVAL ); |
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204 | |
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205 | if ( !is_valid_signo(evp->sigev_signo) ) |
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206 | rtems_set_errno_and_return_minus_one( EINVAL ); |
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207 | } |
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208 | |
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209 | _Thread_Disable_dispatch(); /* to prevent deletion */ |
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210 | |
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211 | /* |
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212 | * Allocate a timer |
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213 | */ |
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214 | ptimer = _POSIX_Timer_Allocate(); |
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215 | if ( !ptimer ) { |
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216 | _Thread_Enable_dispatch(); |
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217 | rtems_set_errno_and_return_minus_one( EAGAIN ); |
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218 | } |
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219 | |
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220 | /* The data of the created timer are stored to use them later */ |
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221 | |
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222 | ptimer->state = STATE_CREATE_NEW_C; |
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223 | ptimer->thread_id = _Thread_Executing->Object.id; |
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224 | |
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225 | if ( evp != NULL ) { |
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226 | ptimer->inf.sigev_notify = evp->sigev_notify; |
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227 | ptimer->inf.sigev_signo = evp->sigev_signo; |
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228 | ptimer->inf.sigev_value = evp->sigev_value; |
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229 | } |
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230 | |
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231 | ptimer->overrun = 0; |
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232 | ptimer->timer_data.it_value.tv_sec = 0; |
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233 | ptimer->timer_data.it_value.tv_nsec = 0; |
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234 | ptimer->timer_data.it_interval.tv_sec = 0; |
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235 | ptimer->timer_data.it_interval.tv_nsec = 0; |
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236 | |
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237 | _Watchdog_Initialize( &ptimer->Timer, NULL, 0, NULL ); |
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238 | _Objects_Open(&_POSIX_Timer_Information, &ptimer->Object, (Objects_Name) 0); |
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239 | |
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240 | *timerid = ptimer->Object.id; |
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241 | _Thread_Enable_dispatch(); |
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242 | return 0; |
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243 | } |
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244 | |
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245 | /* |
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246 | * 14.2.3 Delete a Per_process Timer, P1003.1b-1993, p. 266 |
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247 | */ |
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248 | |
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249 | int timer_delete( |
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250 | timer_t timerid |
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251 | ) |
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252 | { |
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253 | /* |
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254 | * IDEA: This function must probably stop the timer first and then delete it |
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255 | * |
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256 | * It will have to do a call to rtems_timer_cancel and then another |
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257 | * call to rtems_timer_delete. |
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258 | * The call to rtems_timer_delete will be probably unnecessary, |
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259 | * because rtems_timer_delete stops the timer before deleting it. |
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260 | */ |
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261 | POSIX_Timer_Control *ptimer; |
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262 | Objects_Locations location; |
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263 | |
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264 | ptimer = _POSIX_Timer_Get( timerid, &location ); |
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265 | switch ( location ) { |
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266 | case OBJECTS_REMOTE: |
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267 | #if defined(RTEMS_MULTIPROCESSING) |
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268 | _Thread_Dispatch(); |
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269 | rtems_set_errno_and_return_minus_one( EINVAL ); |
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270 | #endif |
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271 | |
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272 | case OBJECTS_ERROR: |
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273 | rtems_set_errno_and_return_minus_one( EINVAL ); |
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274 | |
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275 | case OBJECTS_LOCAL: |
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276 | _Objects_Close( &_POSIX_Timer_Information, &ptimer->Object ); |
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277 | ptimer->state = STATE_FREE_C; |
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278 | (void) _Watchdog_Remove( &ptimer->Timer ); |
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279 | _POSIX_Timer_Free( ptimer ); |
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280 | _Thread_Enable_dispatch(); |
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281 | return 0; |
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282 | } |
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283 | return -1; /* unreached - only to remove warnings */ |
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284 | } |
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285 | |
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286 | /* |
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287 | * 14.2.4 Per-Process Timers, P1003.1b-1993, p. 267 |
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288 | */ |
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289 | |
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290 | /* ************** |
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291 | * timer_settime |
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292 | * **************/ |
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293 | |
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294 | |
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295 | int timer_settime( |
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296 | timer_t timerid, |
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297 | int flags, |
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298 | const struct itimerspec *value, |
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299 | struct itimerspec *ovalue |
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300 | ) |
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301 | { |
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302 | POSIX_Timer_Control *ptimer; |
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303 | Objects_Locations location; |
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304 | boolean activated; |
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305 | |
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306 | if ( value == NULL ) { |
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307 | rtems_set_errno_and_return_minus_one( EINVAL ); |
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308 | } |
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309 | |
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310 | /* First, it verifies if the structure "value" is correct */ |
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311 | if ( ( value->it_value.tv_nsec > MAX_NSEC_C ) || |
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312 | ( value->it_value.tv_nsec < MIN_NSEC_C ) ) { |
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313 | /* The number of nanoseconds is not correct */ |
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314 | rtems_set_errno_and_return_minus_one( EINVAL ); |
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315 | } |
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316 | |
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317 | /* XXX check for seconds in the past */ |
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318 | |
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319 | if ( flags != TIMER_ABSTIME && flags != TIMER_RELATIVE_C ) { |
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320 | rtems_set_errno_and_return_minus_one( EINVAL ); |
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321 | } |
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322 | |
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323 | /* If the function reaches this point, then it will be necessary to do |
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324 | * something with the structure of times of the timer: to stop, start |
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325 | * or start it again |
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326 | */ |
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327 | |
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328 | ptimer = _POSIX_Timer_Get( timerid, &location ); |
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329 | switch ( location ) { |
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330 | case OBJECTS_REMOTE: |
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331 | #if defined(RTEMS_MULTIPROCESSING) |
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332 | _Thread_Dispatch(); |
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333 | return -1; |
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334 | rtems_set_errno_and_return_minus_one( EINVAL ); |
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335 | #endif |
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336 | |
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337 | case OBJECTS_ERROR: |
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338 | return -1; |
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339 | |
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340 | case OBJECTS_LOCAL: |
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341 | /* First, it verifies if the timer must be stopped */ |
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342 | if ( value->it_value.tv_sec == 0 && value->it_value.tv_nsec == 0 ) { |
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343 | /* Stop the timer */ |
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344 | (void) _Watchdog_Remove( &ptimer->Timer ); |
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345 | /* The old data of the timer are returned */ |
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346 | if ( ovalue ) |
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347 | *ovalue = ptimer->timer_data; |
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348 | /* The new data are set */ |
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349 | ptimer->timer_data = *value; |
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350 | /* Indicates that the timer is created and stopped */ |
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351 | ptimer->state = STATE_CREATE_STOP_C; |
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352 | /* Returns with success */ |
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353 | _Thread_Enable_dispatch(); |
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354 | return 0; |
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355 | } |
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356 | |
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357 | /* absolute or relative? */ |
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358 | switch (flags) { |
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359 | case TIMER_ABSTIME: |
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360 | |
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361 | /* The fire time is absolute: use "rtems_time_fire_when" */ |
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362 | /* First, it converts from struct itimerspec to rtems_time_of_day */ |
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363 | |
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364 | #if 0 |
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365 | ITIMERSPEC_TO_RTEMS_TIME_OF_DAY_S( value, &tod ); |
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366 | status = rtems_timer_fire_when( |
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367 | ptimer->timer_id, &tod, _POSIX_Timer_TSR, ptimer); |
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368 | #endif |
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369 | _Watchdog_Initialize( |
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370 | &ptimer->Timer, _POSIX_Timer_TSR, ptimer->Object.id, ptimer ); |
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371 | |
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372 | _Watchdog_Insert_seconds( |
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373 | &ptimer->Timer, |
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374 | value->it_value.tv_sec - _TOD_Seconds_since_epoch |
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375 | ); |
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376 | |
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377 | /* Returns the old ones in "ovalue" */ |
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378 | if ( ovalue ) |
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379 | *ovalue = ptimer->timer_data; |
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380 | ptimer->timer_data = *value; |
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381 | |
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382 | /* Indicate that the time is running */ |
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383 | ptimer->state = STATE_CREATE_RUN_C; |
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384 | |
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385 | /* Stores the time in which the timer was started again */ |
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386 | ptimer->time = _TOD_Current; |
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387 | _Thread_Enable_dispatch(); |
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388 | return 0; |
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389 | break; |
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390 | |
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391 | /* The fire time is relative: use "rtems_time_fire_after" */ |
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392 | case TIMER_RELATIVE_C: |
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393 | /* First, convert from seconds and nanoseconds to ticks */ |
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394 | ptimer->ticks = ( SEC_TO_TICKS_C * value->it_value.tv_sec ) + |
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395 | ( value->it_value.tv_nsec / (NSEC_PER_SEC_C / SEC_TO_TICKS_C)); |
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396 | |
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397 | #if 0 |
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398 | status = rtems_timer_fire_after( |
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399 | ptimer->timer_id, ptimer->ticks, _POSIX_Timer_TSR, ptimer ); |
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400 | #endif |
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401 | activated = _Watchdog_Insert_ticks_helper( |
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402 | &ptimer->Timer, |
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403 | ptimer->ticks, |
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404 | ptimer->Object.id, |
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405 | _POSIX_Timer_TSR, |
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406 | ptimer |
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407 | ); |
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408 | if ( !activated ) |
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409 | return 0; |
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410 | |
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411 | /* The timer has been started and is running */ |
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412 | /* return the old ones in "ovalue" */ |
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413 | if ( ovalue ) |
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414 | *ovalue = ptimer->timer_data; |
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415 | ptimer->timer_data = *value; |
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416 | |
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417 | /* Indicate that the time is running */ |
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418 | ptimer->state = STATE_CREATE_RUN_C; |
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419 | ptimer->time = _TOD_Current; |
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420 | _Thread_Enable_dispatch(); |
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421 | return 0; |
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422 | } |
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423 | _Thread_Enable_dispatch(); |
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424 | rtems_set_errno_and_return_minus_one( EINVAL ); |
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425 | } |
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426 | return -1; /* unreached - only to remove warnings */ |
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427 | } |
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428 | |
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429 | /* |
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430 | * 14.2.4 Per-Process Timers, P1003.1b-1993, p. 267 |
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431 | */ |
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432 | |
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433 | /* ************** |
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434 | * timer_gettime |
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435 | * **************/ |
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436 | |
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437 | int timer_gettime( |
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438 | timer_t timerid, |
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439 | struct itimerspec *value |
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440 | ) |
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441 | { |
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442 | |
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443 | /* |
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444 | * IDEA: This function does not use functions of RTEMS to the handle |
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445 | * of timers. It uses some functions for managing the time. |
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446 | * |
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447 | * A possible form to do this is the following: |
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448 | * |
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449 | * - When a timer is initialized, the value of the time in |
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450 | * that moment is stored. |
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451 | * - When this function is called, it returns the difference |
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452 | * between the current time and the initialization time. |
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453 | */ |
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454 | |
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455 | POSIX_Timer_Control *ptimer; |
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456 | Objects_Locations location; |
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457 | rtems_time_of_day current_time; |
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458 | uint32_t hours; |
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459 | uint32_t minutes; |
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460 | uint32_t seconds; |
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461 | uint32_t ticks; |
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462 | uint32_t nanosec; |
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463 | |
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464 | /* Reads the current time */ |
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465 | current_time = _TOD_Current; |
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466 | |
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467 | ptimer = _POSIX_Timer_Get( timerid, &location ); |
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468 | switch ( location ) { |
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469 | case OBJECTS_REMOTE: |
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470 | #if defined(RTEMS_MULTIPROCESSING) |
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471 | _Thread_Dispatch(); |
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472 | rtems_set_errno_and_return_minus_one( EINVAL ); |
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473 | #endif |
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474 | |
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475 | case OBJECTS_ERROR: |
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476 | rtems_set_errno_and_return_minus_one( EINVAL ); |
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477 | |
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478 | case OBJECTS_LOCAL: |
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479 | /* Calculates the difference between the start time of the timer and |
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480 | * the current one */ |
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481 | |
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482 | hours = current_time.hour - ptimer->time.hour; |
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483 | |
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484 | if ( current_time.minute < ptimer->time.minute ) { |
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485 | minutes = 60 - ptimer->time.minute + current_time.minute; |
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486 | hours--; |
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487 | } else { |
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488 | minutes = current_time.minute - ptimer->time.minute; |
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489 | } |
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490 | |
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491 | if ( current_time.second < ptimer->time.second ) { |
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492 | seconds = 60 - ptimer->time.second + current_time.second; |
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493 | minutes--; |
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494 | } else { |
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495 | seconds = current_time.second - ptimer->time.second; |
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496 | } |
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497 | |
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498 | if ( current_time.ticks < ptimer->time.ticks ) { |
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499 | ticks = 100 - ptimer->time.ticks + current_time.ticks; |
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500 | seconds--; |
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501 | } else { |
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502 | ticks = current_time.ticks - ptimer->time.ticks; |
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503 | } |
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504 | |
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505 | /* The time that the timer is running is calculated */ |
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506 | seconds = hours * 60 * 60 + |
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507 | minutes * 60 + |
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508 | seconds; |
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509 | |
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510 | nanosec = ticks * 10 * /* msec */ |
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511 | 1000 * /* microsec */ |
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512 | 1000; /* nanosec */ |
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513 | |
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514 | |
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515 | /* Calculates the time left before the timer finishes */ |
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516 | |
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517 | value->it_value.tv_sec = ptimer->timer_data.it_value.tv_sec - seconds; |
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518 | value->it_value.tv_nsec = ptimer->timer_data.it_value.tv_nsec - nanosec; |
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519 | |
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520 | value->it_interval.tv_sec = ptimer->timer_data.it_interval.tv_sec; |
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521 | value->it_interval.tv_nsec = ptimer->timer_data.it_interval.tv_nsec; |
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522 | |
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523 | _Thread_Enable_dispatch(); |
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524 | return 0; |
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525 | } |
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526 | return -1; /* unreached - only to remove warnings */ |
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527 | } |
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528 | |
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529 | /* |
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530 | * 14.2.4 Per-Process Timers, P1003.1b-1993, p. 267 |
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531 | */ |
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532 | |
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533 | /* |
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534 | * timer_getoverrun |
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535 | * |
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536 | * The expiration of a timer must increase by one a counter. |
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537 | * After the signal handler associated to the timer finishes |
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538 | * its execution, _POSIX_Timer_TSR will have to set this counter to 0. |
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539 | */ |
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540 | |
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541 | int timer_getoverrun( |
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542 | timer_t timerid |
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543 | ) |
---|
544 | { |
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545 | int overrun; |
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546 | POSIX_Timer_Control *ptimer; |
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547 | Objects_Locations location; |
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548 | |
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549 | ptimer = _POSIX_Timer_Get( timerid, &location ); |
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550 | switch ( location ) { |
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551 | case OBJECTS_REMOTE: |
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552 | #if defined(RTEMS_MULTIPROCESSING) |
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553 | _Thread_Dispatch(); |
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554 | rtems_set_errno_and_return_minus_one( EINVAL ); |
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555 | #endif |
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556 | |
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557 | case OBJECTS_ERROR: |
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558 | rtems_set_errno_and_return_minus_one( EINVAL ); |
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559 | |
---|
560 | case OBJECTS_LOCAL: |
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561 | overrun = ptimer->overrun; |
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562 | ptimer->overrun = 0; |
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563 | _Thread_Enable_dispatch(); |
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564 | return overrun; |
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565 | } |
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566 | return -1; /* unreached - only to remove warnings */ |
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567 | } |
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