1 | /* timer.h |
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2 | * |
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3 | * This include file contains all the constants, structures, and |
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4 | * prototypes associated with the Timer Manager. This manager provides |
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5 | * facilities to configure, initiate, cancel, and delete timers which will |
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6 | * fire at specified intervals of time. |
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7 | * |
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8 | * Directives provided are: |
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9 | * |
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10 | * + create a timer |
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11 | * + get an ID of a timer |
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12 | * + delete a timer |
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13 | * + set timer to fire in context of clock tick |
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14 | * - after a number of ticks have passed |
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15 | * - when a specified date and time has been reached |
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16 | * + initiate the timer server task |
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17 | * + set timer to fire in context of the timer server task |
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18 | * - after a number of ticks have passed |
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19 | * - when a specified date and time has been reached |
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20 | * + reset a timer |
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21 | * + cancel a time |
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22 | * |
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23 | * COPYRIGHT (c) 1989-2002. |
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24 | * On-Line Applications Research Corporation (OAR). |
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25 | * |
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26 | * The license and distribution terms for this file may be |
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27 | * found in the file LICENSE in this distribution or at |
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28 | * http://www.OARcorp.com/rtems/license.html. |
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29 | * |
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30 | * $Id$ |
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31 | */ |
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32 | |
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33 | #ifndef __RTEMS_TIMER_h |
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34 | #define __RTEMS_TIMER_h |
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35 | |
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36 | #ifdef __cplusplus |
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37 | extern "C" { |
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38 | #endif |
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39 | |
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40 | #include <rtems/score/object.h> |
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41 | #include <rtems/score/tod.h> |
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42 | #include <rtems/score/watchdog.h> |
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43 | #include <rtems/rtems/attr.h> |
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44 | |
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45 | /* |
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46 | * The following enumerated type details the classes to which a timer |
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47 | * may belong. |
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48 | */ |
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49 | |
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50 | typedef enum { |
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51 | TIMER_INTERVAL, |
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52 | TIMER_INTERVAL_ON_TASK, |
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53 | TIMER_TIME_OF_DAY, |
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54 | TIMER_TIME_OF_DAY_ON_TASK, |
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55 | TIMER_DORMANT |
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56 | } Timer_Classes; |
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57 | |
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58 | /* |
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59 | * The following types define a pointer to a timer service routine. |
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60 | */ |
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61 | |
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62 | typedef void rtems_timer_service_routine; |
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63 | |
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64 | typedef rtems_timer_service_routine ( *rtems_timer_service_routine_entry )( |
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65 | rtems_id, |
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66 | void * |
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67 | ); |
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68 | |
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69 | /* |
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70 | * The following defines the information control block used to manage |
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71 | * this class of objects. |
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72 | */ |
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73 | |
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74 | RTEMS_EXTERN Objects_Information _Timer_Information; |
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75 | |
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76 | /* |
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77 | * Pointer to TCB of the Timer Server. This is NULL before the |
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78 | * server is executing and task-based timers are not allowed to be |
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79 | * initiated until the server is started. |
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80 | */ |
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81 | |
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82 | RTEMS_EXTERN Thread_Control *_Timer_Server; |
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83 | |
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84 | /* |
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85 | * The following chains contain the list of interval timers that are |
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86 | * executed in the context of the Timer Server. |
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87 | * |
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88 | * NOTE: These are extern'ed because they do not have to be in the |
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89 | * minimum footprint. They are only really required when |
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90 | * task-based timers are used. Since task-based timers can |
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91 | * not be started until the server is initiated, these structures |
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92 | * do not have to be initialized until then. They are declared |
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93 | * in the same file as _Timer_Server_body. |
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94 | */ |
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95 | |
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96 | extern Chain_Control _Timer_Ticks_chain; |
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97 | extern Chain_Control _Timer_Seconds_chain; |
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98 | |
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99 | /* |
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100 | * The following records define the control block used to manage |
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101 | * each timer. |
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102 | */ |
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103 | |
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104 | typedef struct { |
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105 | Objects_Control Object; |
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106 | Watchdog_Control Ticker; |
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107 | Timer_Classes the_class; |
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108 | } Timer_Control; |
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109 | |
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110 | /* |
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111 | * _Timer_Manager_initialization |
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112 | * |
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113 | * DESCRIPTION: |
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114 | * |
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115 | * This routine performs the initialization necessary for this manager. |
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116 | */ |
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117 | |
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118 | void _Timer_Manager_initialization( |
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119 | unsigned32 maximum_timers |
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120 | ); |
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121 | |
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122 | /* |
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123 | * _Timer_Server_body |
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124 | * |
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125 | * DESCRIPTION: |
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126 | * |
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127 | * This is the server for task based timers. This task executes whenever |
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128 | * a task-based timer should fire. It services both "after" and "when" |
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129 | * timers. It is not created automatically but must be created explicitly |
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130 | * by the application before task-based timers may be initiated. |
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131 | */ |
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132 | |
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133 | Thread _Timer_Server_body( |
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134 | unsigned32 ignored |
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135 | ); |
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136 | |
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137 | /* |
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138 | * rtems_timer_create |
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139 | * |
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140 | * DESCRIPTION: |
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141 | * |
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142 | * This routine implements the rtems_timer_create directive. The |
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143 | * timer will have the name name. It returns the id of the |
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144 | * created timer in ID. |
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145 | */ |
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146 | |
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147 | rtems_status_code rtems_timer_create( |
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148 | rtems_name name, |
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149 | Objects_Id *id |
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150 | ); |
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151 | |
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152 | /* |
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153 | * rtems_timer_ident |
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154 | * |
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155 | * DESCRIPTION: |
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156 | * |
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157 | * This routine implements the rtems_timer_ident directive. |
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158 | * This directive returns the timer ID associated with name. |
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159 | * If more than one timer is named name, then the timer |
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160 | * to which the ID belongs is arbitrary. |
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161 | */ |
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162 | |
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163 | rtems_status_code rtems_timer_ident( |
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164 | rtems_name name, |
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165 | Objects_Id *id |
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166 | ); |
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167 | |
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168 | /* |
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169 | * rtems_timer_cancel |
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170 | * |
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171 | * DESCRIPTION: |
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172 | * |
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173 | * This routine implements the rtems_timer_cancel directive. It is used |
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174 | * to stop the timer associated with ID from firing. |
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175 | */ |
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176 | |
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177 | rtems_status_code rtems_timer_cancel( |
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178 | Objects_Id id |
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179 | ); |
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180 | |
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181 | /* |
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182 | * rtems_timer_delete |
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183 | * |
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184 | * DESCRIPTION: |
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185 | * |
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186 | * This routine implements the rtems_timer_delete directive. The |
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187 | * timer indicated by ID is deleted. |
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188 | */ |
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189 | |
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190 | rtems_status_code rtems_timer_delete( |
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191 | Objects_Id id |
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192 | ); |
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193 | |
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194 | /* |
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195 | * rtems_timer_fire_after |
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196 | * |
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197 | * DESCRIPTION: |
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198 | * |
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199 | * This routine implements the rtems_timer_fire_after directive. It |
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200 | * initiates the timer associated with ID to fire in ticks clock ticks. |
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201 | * When the timer fires, the routine will be invoked in the context |
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202 | * of the rtems_clock_tick directive which is normally invoked as |
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203 | * part of servicing a periodic interupt. |
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204 | */ |
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205 | |
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206 | rtems_status_code rtems_timer_fire_after( |
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207 | Objects_Id id, |
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208 | rtems_interval ticks, |
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209 | rtems_timer_service_routine_entry routine, |
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210 | void *user_data |
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211 | ); |
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212 | |
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213 | /* |
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214 | * rtems_timer_server_fire_after |
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215 | * |
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216 | * DESCRIPTION: |
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217 | * |
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218 | * This routine implements the rtems_timer_server_fire_after directive. It |
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219 | * initiates the timer associated with ID to fire in ticks clock |
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220 | * ticks. When the timer fires, the routine will be invoked by the |
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221 | * Timer Server in the context of a task NOT IN THE CONTEXT of the |
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222 | * clock tick interrupt. |
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223 | */ |
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224 | |
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225 | rtems_status_code rtems_timer_server_fire_after( |
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226 | Objects_Id id, |
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227 | rtems_interval ticks, |
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228 | rtems_timer_service_routine_entry routine, |
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229 | void *user_data |
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230 | ); |
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231 | |
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232 | /* |
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233 | * rtems_timer_fire_when |
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234 | * |
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235 | * DESCRIPTION: |
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236 | * |
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237 | * This routine implements the rtems_timer_fire_when directive. It |
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238 | * initiates the timer associated with ID to fire at wall_time |
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239 | * When the timer fires, the routine will be invoked in the context |
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240 | * of the rtems_clock_tick directive which is normally invoked as |
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241 | * part of servicing a periodic interupt. |
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242 | */ |
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243 | |
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244 | rtems_status_code rtems_timer_fire_when( |
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245 | Objects_Id id, |
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246 | rtems_time_of_day *wall_time, |
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247 | rtems_timer_service_routine_entry routine, |
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248 | void *user_data |
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249 | ); |
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250 | |
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251 | /* |
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252 | * rtems_timer_server_fire_when |
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253 | * |
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254 | * DESCRIPTION: |
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255 | * |
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256 | * This routine implements the rtems_timer_server_fire_when directive. It |
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257 | * initiates the timer associated with ID to fire at wall_time |
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258 | * When the timer fires, the routine will be invoked by the |
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259 | * Timer Server in the context of a task NOT IN THE CONTEXT of the |
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260 | * clock tick interrupt. |
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261 | */ |
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262 | |
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263 | rtems_status_code rtems_timer_server_fire_when( |
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264 | Objects_Id id, |
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265 | rtems_time_of_day *wall_time, |
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266 | rtems_timer_service_routine_entry routine, |
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267 | void *user_data |
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268 | ); |
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269 | |
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270 | /* |
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271 | * rtems_timer_reset |
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272 | * |
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273 | * DESCRIPTION: |
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274 | * |
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275 | * This routine implements the rtems_timer_reset directive. It is used |
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276 | * to reinitialize the interval timer associated with ID just as if |
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277 | * rtems_timer_fire_after were re-invoked with the same arguments that |
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278 | * were used to initiate this timer. |
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279 | */ |
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280 | |
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281 | rtems_status_code rtems_timer_reset( |
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282 | Objects_Id id |
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283 | ); |
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284 | |
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285 | /* |
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286 | * rtems_timer_initiate_server |
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287 | * |
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288 | * DESCRIPTION: |
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289 | * |
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290 | * This routine implements the rtems_timer_initiate_server directive. |
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291 | * It creates and starts the server that executes task-based timers. |
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292 | * It must be invoked before any task-based timers can be initiated. |
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293 | */ |
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294 | |
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295 | #define RTEMS_TIMER_SERVER_DEFAULT_PRIORITY -1 |
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296 | |
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297 | rtems_status_code rtems_timer_initiate_server( |
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298 | unsigned32 priority, |
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299 | unsigned32 stack_size, |
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300 | rtems_attribute attribute_set |
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301 | ); |
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302 | |
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303 | /* |
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304 | * rtems_timer_get_information |
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305 | * |
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306 | * DESCRIPTION: |
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307 | * |
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308 | * This routine implements the rtems_timer_get_information directive. |
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309 | * This directive returns information about the timer. |
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310 | */ |
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311 | |
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312 | typedef struct { |
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313 | Timer_Classes the_class; |
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314 | Watchdog_Interval initial; |
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315 | Watchdog_Interval start_time; |
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316 | Watchdog_Interval stop_time; |
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317 | } rtems_timer_information; |
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318 | |
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319 | rtems_status_code rtems_timer_get_information( |
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320 | Objects_Id id, |
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321 | rtems_timer_information *the_info |
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322 | ); |
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323 | |
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324 | /* |
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325 | * Macros and routines that expose the mechanisms required to service |
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326 | * the Timer Server timer. These stop the timer, synchronize it with |
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327 | * the current time, and restart it. |
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328 | */ |
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329 | |
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330 | extern Watchdog_Control _Timer_Seconds_timer; |
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331 | |
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332 | #define _Timer_Server_stop_ticks_timer() \ |
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333 | _Watchdog_Remove( &_Timer_Server->Timer ) |
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334 | |
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335 | #define _Timer_Server_stop_seconds_timer() \ |
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336 | _Watchdog_Remove( &_Timer_Seconds_timer ); |
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337 | |
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338 | void _Timer_Server_process_ticks_chain(void); |
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339 | void _Timer_Server_process_seconds_chain(void); |
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340 | |
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341 | #define _Timer_Server_reset_ticks_timer() \ |
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342 | do { \ |
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343 | if ( !_Chain_Is_empty( &_Timer_Ticks_chain ) ) { \ |
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344 | _Watchdog_Insert_ticks( &_Timer_Server->Timer, \ |
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345 | ((Watchdog_Control *)_Timer_Ticks_chain.first)->delta_interval ); \ |
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346 | } \ |
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347 | } while (0) |
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348 | |
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349 | #define _Timer_Server_reset_seconds_timer() \ |
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350 | do { \ |
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351 | if ( !_Chain_Is_empty( &_Timer_Seconds_chain ) ) { \ |
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352 | _Watchdog_Insert_seconds( &_Timer_Seconds_timer, \ |
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353 | ((Watchdog_Control *)_Timer_Seconds_chain.first)->delta_interval ); \ |
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354 | } \ |
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355 | } while (0) |
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356 | |
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357 | #ifndef __RTEMS_APPLICATION__ |
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358 | #include <rtems/rtems/timer.inl> |
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359 | #endif |
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360 | |
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361 | #ifdef __cplusplus |
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362 | } |
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363 | #endif |
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364 | |
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365 | #endif |
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366 | /* end of include file */ |
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