1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Function Arms or Disarms the Timer Identified by timerid |
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5 | * @ingroup POSIXAPI |
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6 | */ |
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7 | |
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8 | /* |
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9 | * 14.2.4 Per-Process Timers, P1003.1b-1993, p. 267 |
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10 | * |
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11 | * COPYRIGHT (c) 1989-2008. |
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12 | * On-Line Applications Research Corporation (OAR). |
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13 | * |
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14 | * The license and distribution terms for this file may be |
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15 | * found in the file LICENSE in this distribution or at |
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16 | * http://www.rtems.org/license/LICENSE. |
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17 | */ |
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18 | |
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19 | #if HAVE_CONFIG_H |
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20 | #include "config.h" |
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21 | #endif |
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22 | |
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23 | #include <time.h> |
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24 | #include <errno.h> |
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25 | |
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26 | #include <rtems/posix/ptimer.h> |
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27 | #include <rtems/posix/timerimpl.h> |
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28 | #include <rtems/score/todimpl.h> |
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29 | #include <rtems/score/watchdogimpl.h> |
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30 | #include <rtems/seterr.h> |
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31 | |
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32 | static void _POSIX_Timer_Insert( |
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33 | POSIX_Timer_Control *ptimer, |
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34 | Per_CPU_Control *cpu, |
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35 | Watchdog_Interval ticks |
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36 | ) |
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37 | { |
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38 | /* The state really did not change but just to be safe */ |
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39 | ptimer->state = POSIX_TIMER_STATE_CREATE_RUN; |
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40 | |
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41 | /* Store the time when the timer was started again */ |
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42 | _TOD_Get( &ptimer->time ); |
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43 | |
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44 | _Watchdog_Insert( |
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45 | &cpu->Watchdog.Header[ PER_CPU_WATCHDOG_TICKS ], |
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46 | &ptimer->Timer, |
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47 | cpu->Watchdog.ticks + ticks |
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48 | ); |
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49 | } |
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50 | |
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51 | /* |
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52 | * This is the operation that is run when a timer expires |
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53 | */ |
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54 | void _POSIX_Timer_TSR( Watchdog_Control *the_watchdog ) |
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55 | { |
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56 | POSIX_Timer_Control *ptimer; |
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57 | ISR_lock_Context lock_context; |
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58 | Per_CPU_Control *cpu; |
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59 | |
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60 | ptimer = RTEMS_CONTAINER_OF( the_watchdog, POSIX_Timer_Control, Timer ); |
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61 | _ISR_lock_ISR_disable( &lock_context ); |
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62 | cpu = _POSIX_Timer_Acquire_critical( ptimer, &lock_context ); |
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63 | |
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64 | /* Increment the number of expirations. */ |
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65 | ptimer->overrun = ptimer->overrun + 1; |
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66 | |
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67 | /* The timer must be reprogrammed */ |
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68 | if ( ( ptimer->timer_data.it_interval.tv_sec != 0 ) || |
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69 | ( ptimer->timer_data.it_interval.tv_nsec != 0 ) ) { |
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70 | _POSIX_Timer_Insert( ptimer, cpu, ptimer->ticks ); |
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71 | } else { |
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72 | /* Indicates that the timer is stopped */ |
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73 | ptimer->state = POSIX_TIMER_STATE_CREATE_STOP; |
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74 | } |
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75 | |
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76 | _POSIX_Timer_Release( cpu, &lock_context ); |
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77 | |
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78 | /* |
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79 | * The sending of the signal to the process running the handling function |
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80 | * specified for that signal is simulated |
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81 | */ |
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82 | |
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83 | if ( pthread_kill ( ptimer->thread_id, ptimer->inf.sigev_signo ) ) { |
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84 | _Assert( FALSE ); |
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85 | /* |
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86 | * TODO: What if an error happens at run-time? This should never |
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87 | * occur because the timer should be canceled if the thread |
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88 | * is deleted. This method is being invoked from the Clock |
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89 | * Tick ISR so even if we decide to take action on an error, |
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90 | * we don't have many options. We shouldn't shut the system down. |
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91 | */ |
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92 | } |
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93 | |
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94 | /* After the signal handler returns, the count of expirations of the |
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95 | * timer must be set to 0. |
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96 | */ |
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97 | ptimer->overrun = 0; |
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98 | } |
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99 | |
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100 | int timer_settime( |
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101 | timer_t timerid, |
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102 | int flags, |
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103 | const struct itimerspec *__restrict value, |
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104 | struct itimerspec *__restrict ovalue |
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105 | ) |
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106 | { |
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107 | POSIX_Timer_Control *ptimer; |
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108 | ISR_lock_Context lock_context; |
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109 | uint32_t initial_period; |
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110 | struct itimerspec normalize; |
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111 | |
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112 | if ( !value ) |
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113 | rtems_set_errno_and_return_minus_one( EINVAL ); |
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114 | |
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115 | /* |
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116 | * First, it verifies if the structure "value" is correct |
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117 | * if the number of nanoseconds is not correct return EINVAL |
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118 | */ |
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119 | if ( !_Timespec_Is_valid( &(value->it_value) ) ) { |
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120 | rtems_set_errno_and_return_minus_one( EINVAL ); |
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121 | } |
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122 | if ( !_Timespec_Is_valid( &(value->it_interval) ) ) { |
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123 | rtems_set_errno_and_return_minus_one( EINVAL ); |
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124 | } |
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125 | |
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126 | if ( flags != TIMER_ABSTIME && flags != POSIX_TIMER_RELATIVE ) { |
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127 | rtems_set_errno_and_return_minus_one( EINVAL ); |
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128 | } |
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129 | |
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130 | normalize = *value; |
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131 | |
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132 | /* Convert absolute to relative time */ |
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133 | if (flags == TIMER_ABSTIME) { |
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134 | struct timespec now; |
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135 | _TOD_Get( &now ); |
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136 | /* Check for seconds in the past */ |
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137 | if ( _Timespec_Greater_than( &now, &normalize.it_value ) ) |
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138 | rtems_set_errno_and_return_minus_one( EINVAL ); |
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139 | _Timespec_Subtract( &now, &normalize.it_value, &normalize.it_value ); |
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140 | } |
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141 | |
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142 | /* If the function reaches this point, then it will be necessary to do |
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143 | * something with the structure of times of the timer: to stop, start |
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144 | * or start it again |
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145 | */ |
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146 | |
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147 | ptimer = _POSIX_Timer_Get( timerid, &lock_context ); |
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148 | if ( ptimer != NULL ) { |
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149 | Per_CPU_Control *cpu; |
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150 | |
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151 | cpu = _POSIX_Timer_Acquire_critical( ptimer, &lock_context ); |
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152 | |
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153 | /* Stop the timer */ |
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154 | _Watchdog_Remove( |
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155 | &cpu->Watchdog.Header[ PER_CPU_WATCHDOG_TICKS ], |
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156 | &ptimer->Timer |
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157 | ); |
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158 | |
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159 | /* First, it verifies if the timer must be stopped */ |
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160 | if ( normalize.it_value.tv_sec == 0 && normalize.it_value.tv_nsec == 0 ) { |
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161 | /* The old data of the timer are returned */ |
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162 | if ( ovalue ) |
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163 | *ovalue = ptimer->timer_data; |
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164 | /* The new data are set */ |
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165 | ptimer->timer_data = normalize; |
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166 | /* Indicates that the timer is created and stopped */ |
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167 | ptimer->state = POSIX_TIMER_STATE_CREATE_STOP; |
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168 | /* Returns with success */ |
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169 | _POSIX_Timer_Release( cpu, &lock_context ); |
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170 | return 0; |
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171 | } |
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172 | |
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173 | /* Convert from seconds and nanoseconds to ticks */ |
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174 | ptimer->ticks = _Timespec_To_ticks( &value->it_interval ); |
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175 | initial_period = _Timespec_To_ticks( &normalize.it_value ); |
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176 | |
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177 | _POSIX_Timer_Insert( ptimer, cpu, initial_period ); |
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178 | |
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179 | /* |
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180 | * The timer has been started and is running. So we return the |
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181 | * old ones in "ovalue" |
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182 | */ |
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183 | if ( ovalue ) |
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184 | *ovalue = ptimer->timer_data; |
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185 | ptimer->timer_data = normalize; |
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186 | _POSIX_Timer_Release( cpu, &lock_context ); |
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187 | return 0; |
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188 | } |
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189 | |
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190 | rtems_set_errno_and_return_minus_one( EINVAL ); |
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191 | } |
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