1 | /** |
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2 | * @file rtems/rtems/clock.h |
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3 | * |
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4 | * This include file contains all the constants and structures associated |
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5 | * with the Clock Manager. This manager provides facilities to set, obtain, |
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6 | * and continually update the current date and time. |
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7 | * |
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8 | * This manager provides directives to: |
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9 | * |
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10 | * - set the current date and time |
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11 | * - obtain the current date and time |
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12 | * - set the nanoseconds since last clock tick handler |
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13 | * - announce a clock tick |
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14 | * - obtain the system uptime |
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15 | */ |
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16 | |
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17 | /* COPYRIGHT (c) 1989-2008. |
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18 | * On-Line Applications Research Corporation (OAR). |
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19 | * |
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20 | * The license and distribution terms for this file may be |
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21 | * found in the file LICENSE in this distribution or at |
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22 | * http://www.rtems.com/license/LICENSE. |
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23 | * |
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24 | * $Id$ |
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25 | */ |
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26 | |
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27 | #ifndef _RTEMS_RTEMS_CLOCK_H |
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28 | #define _RTEMS_RTEMS_CLOCK_H |
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29 | |
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30 | #include <rtems/score/tod.h> |
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31 | #include <rtems/score/watchdog.h> |
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32 | #include <rtems/rtems/status.h> |
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33 | #include <rtems/rtems/types.h> |
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34 | |
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35 | #include <sys/time.h> /* struct timeval */ |
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36 | |
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37 | /** |
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38 | * @defgroup ClassicClock Clocks |
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39 | * |
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40 | * @ingroup ClassicRTEMS |
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41 | * |
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42 | * This encapsulates functionality which XXX |
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43 | */ |
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44 | /**@{*/ |
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45 | |
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46 | #ifdef __cplusplus |
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47 | extern "C" { |
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48 | #endif |
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49 | |
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50 | /** |
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51 | * List of things which can be returned by the rtems_clock_get directive. |
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52 | */ |
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53 | typedef enum { |
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54 | /** This value indicates obtain TOD in Classic API format. */ |
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55 | RTEMS_CLOCK_GET_TOD, |
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56 | /** This value indicates obtain the number of seconds since the epoch. */ |
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57 | RTEMS_CLOCK_GET_SECONDS_SINCE_EPOCH, |
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58 | /** This value indicates obtain the number of ticks since system boot. */ |
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59 | RTEMS_CLOCK_GET_TICKS_SINCE_BOOT, |
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60 | /** This value indicates obtain the number of ticks per second. */ |
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61 | RTEMS_CLOCK_GET_TICKS_PER_SECOND, |
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62 | /** This value indicates obtain the TOD in struct timeval format. */ |
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63 | RTEMS_CLOCK_GET_TIME_VALUE |
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64 | } rtems_clock_get_options; |
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65 | |
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66 | /** |
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67 | * Type for the nanoseconds since last tick BSP extension. |
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68 | */ |
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69 | typedef Watchdog_Nanoseconds_since_last_tick_routine |
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70 | rtems_nanoseconds_extension_routine; |
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71 | |
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72 | /** |
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73 | * @brief Obtain Current Time of Day |
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74 | * |
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75 | * This routine implements the rtems_clock_get directive. It returns |
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76 | * one of the following: |
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77 | * + current time of day |
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78 | * + seconds since epoch |
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79 | * + ticks since boot |
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80 | * + ticks per second |
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81 | * |
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82 | * @param[in] option is the format of time to return |
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83 | * @param[in] time_buffer points to the output area |
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84 | * |
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85 | * @return This method returns RTEMS_SUCCESSFUL if there was not an |
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86 | * error. Otherwise, a status code is returned indicating the |
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87 | * source of the error. |
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88 | */ |
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89 | rtems_status_code rtems_clock_get( |
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90 | rtems_clock_get_options option, |
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91 | void *time_buffer |
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92 | ); |
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93 | |
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94 | /** |
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95 | * @brief Obtain Current Time of Day (Classic TOD) |
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96 | * |
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97 | * This routine implements the rtems_clock_get_tod directive. It returns |
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98 | * the current time of day in the format defined by RTEID. |
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99 | * |
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100 | * @param[in] time_buffer points to the time of day structure |
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101 | * |
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102 | * @return This method returns RTEMS_SUCCESSFUL if there was not an |
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103 | * error. Otherwise, a status code is returned indicating the |
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104 | * source of the error. If successful, the time_buffer will |
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105 | * be filled in with the current time of day. |
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106 | */ |
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107 | rtems_status_code rtems_clock_get_tod( |
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108 | rtems_time_of_day *time_buffer |
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109 | ); |
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110 | |
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111 | /** |
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112 | * @brief Obtain TOD in struct timeval Format |
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113 | * |
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114 | * This routine implements the rtems_clock_get_tod_timeval |
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115 | * directive. |
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116 | * |
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117 | * @param[in] time points to the struct timeval variable to fill in |
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118 | * |
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119 | * @return This method returns RTEMS_SUCCESSFUL if there was not an |
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120 | * error. Otherwise, a status code is returned indicating the |
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121 | * source of the error. If successful, the time will |
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122 | * be filled in with the current time of day. |
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123 | */ |
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124 | rtems_status_code rtems_clock_get_tod_timeval( |
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125 | struct timeval *time |
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126 | ); |
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127 | |
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128 | /** |
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129 | * @brief Obtain Seconds Since Epoch |
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130 | * |
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131 | * This routine implements the rtems_clock_get_seconds_since_epoch |
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132 | * directive. |
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133 | * |
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134 | * @param[in] the_interval points to the interval variable to fill in |
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135 | * |
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136 | * @return This method returns RTEMS_SUCCESSFUL if there was not an |
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137 | * error. Otherwise, a status code is returned indicating the |
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138 | * source of the error. If successful, the time_buffer will |
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139 | * be filled in with the current time of day. |
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140 | */ |
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141 | rtems_status_code rtems_clock_get_seconds_since_epoch( |
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142 | rtems_interval *the_interval |
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143 | ); |
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144 | |
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145 | /** |
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146 | * @brief Obtain Ticks Since Boot |
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147 | * |
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148 | * This routine implements the rtems_clock_get_ticks_since_boot |
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149 | * directive. |
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150 | * |
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151 | * @return This method returns the number of ticks since boot. It cannot |
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152 | * fail since RTEMS always keeps a running count of ticks since boot. |
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153 | */ |
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154 | rtems_interval rtems_clock_get_ticks_since_boot(void); |
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155 | |
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156 | /** |
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157 | * @brief Obtain Ticks Per Seconds |
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158 | * |
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159 | * This routine implements the rtems_clock_get_ticks_per_second |
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160 | * directive. |
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161 | * |
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162 | * @return This method returns the number of ticks since boot. It cannot |
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163 | * fail since RTEMS is always configured to know the number of |
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164 | * ticks per second. |
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165 | */ |
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166 | rtems_interval rtems_clock_get_ticks_per_second(void); |
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167 | |
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168 | /** |
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169 | * @brief Set the Current TOD |
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170 | * |
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171 | * This routine implements the rtems_clock_set directive. It sets |
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172 | * the current time of day to that in the time_buffer record. |
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173 | * |
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174 | * @param[in] time_buffer points to the new TOD |
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175 | * |
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176 | * @return This method returns RTEMS_SUCCESSFUL if there was not an |
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177 | * error. Otherwise, a status code is returned indicating the |
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178 | * source of the error. |
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179 | * |
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180 | * @note Activities scheduled based upon the current time of day |
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181 | * may be executed immediately if the time is moved forward. |
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182 | */ |
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183 | rtems_status_code rtems_clock_set( |
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184 | const rtems_time_of_day *time_buffer |
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185 | ); |
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186 | |
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187 | /** |
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188 | * @brief Announce a Clock Tick |
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189 | * |
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190 | * This routine implements the rtems_clock_tick directive. It is invoked |
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191 | * to inform RTEMS of the occurrence of a clock tick. |
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192 | * |
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193 | * @return This directive always returns RTEMS_SUCCESSFUL. |
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194 | * |
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195 | * @note This method is typically called from an ISR and is the basis |
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196 | * for all timeouts and delays. |
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197 | */ |
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198 | rtems_status_code rtems_clock_tick( void ); |
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199 | |
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200 | /** |
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201 | * @brief Set the BSP specific Nanoseconds Extension |
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202 | * |
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203 | * This directive sets the BSP provided nanoseconds since last tick |
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204 | * extension. |
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205 | * |
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206 | * @param[in] routine is a pointer to the extension routine |
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207 | * |
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208 | * @return This method returns RTEMS_SUCCESSFUL if there was not an |
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209 | * error. Otherwise, a status code is returned indicating the |
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210 | * source of the error. |
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211 | */ |
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212 | rtems_status_code rtems_clock_set_nanoseconds_extension( |
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213 | rtems_nanoseconds_extension_routine routine |
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214 | ); |
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215 | |
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216 | /** |
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217 | * @brief Obtain the System Uptime |
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218 | * |
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219 | * This directive returns the system uptime. |
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220 | * |
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221 | * @param[in] uptime is a pointer to the time structure |
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222 | * |
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223 | * @return This method returns RTEMS_SUCCESSFUL if there was not an |
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224 | * error. Otherwise, a status code is returned indicating the |
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225 | * source of the error. If successful, the uptime will be |
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226 | * filled in. |
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227 | */ |
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228 | rtems_status_code rtems_clock_get_uptime( |
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229 | struct timespec *uptime |
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230 | ); |
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231 | |
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232 | /** |
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233 | * @brief _TOD_Validate |
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234 | * |
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235 | * This support function returns true if @a the_tod contains |
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236 | * a valid time of day, and false otherwise. |
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237 | * |
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238 | * @param[in] the_tod is the TOD structure to validate |
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239 | * |
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240 | * @return This method returns true if the TOD is valid and false otherwise. |
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241 | */ |
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242 | bool _TOD_Validate( |
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243 | const rtems_time_of_day *the_tod |
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244 | ); |
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245 | |
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246 | /** |
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247 | * @brief _TOD_To_seconds |
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248 | * |
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249 | * This function returns the number seconds between the epoch and @a the_tod. |
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250 | * |
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251 | * @param[in] the_tod is the TOD structure to convert to seconds |
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252 | * |
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253 | * @return This method returns the number of seconds since epoch represented |
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254 | * by @a the_tod |
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255 | */ |
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256 | Watchdog_Interval _TOD_To_seconds( |
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257 | const rtems_time_of_day *the_tod |
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258 | ); |
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259 | |
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260 | #ifdef __cplusplus |
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261 | } |
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262 | #endif |
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263 | |
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264 | /**@}*/ |
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265 | |
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266 | #endif |
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267 | /* end of include file */ |
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