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annotate packages/kernel/current/include/clock.hxx @ 124:0ec04793409a ecos-sw-2000-09-11

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Merge from eCos master repository on 2000-09-11-03:00:13-BST
author jlarmour
date Mon, 11 Sep 2000 02:42:46 +0000
parents 6ed91473a1cd
children 8f2f7615e727
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1 #ifndef CYGONCE_KERNEL_CLOCK_HXX
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2 #define CYGONCE_KERNEL_CLOCK_HXX
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3
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4 //==========================================================================
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5 //
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6 // clock.hxx
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7 //
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8 // Clock and Alarm class declaration(s)
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9 //
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10 //==========================================================================
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11 //####COPYRIGHTBEGIN####
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12 //
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13 // -------------------------------------------
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14 // The contents of this file are subject to the Red Hat eCos Public License
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15 // Version 1.1 (the "License"); you may not use this file except in
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16 // compliance with the License. You may obtain a copy of the License at
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17 // http://www.redhat.com/
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18 //
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19 // Software distributed under the License is distributed on an "AS IS"
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20 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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21 // License for the specific language governing rights and limitations under
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22 // the License.
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23 //
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24 // The Original Code is eCos - Embedded Configurable Operating System,
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25 // released September 30, 1998.
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26 //
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27 // The Initial Developer of the Original Code is Red Hat.
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28 // Portions created by Red Hat are
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29 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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30 // All Rights Reserved.
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31 // -------------------------------------------
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32 //
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33 //####COPYRIGHTEND####
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34 //==========================================================================
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35 //#####DESCRIPTIONBEGIN####
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36 //
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37 // Author(s): nickg
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38 // Contributors: nickg
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39 // Date: 1997-09-09
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40 // Purpose: Define Clock and Alarm class interfaces
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41 // Description: The classes defined here collectively implement the
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42 // internal API used to create, configure and manage Counters,
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43 // Clocks and Alarms.
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44 // Usage: #include <cyg/kernel/clock.hxx>
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45 //
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46 //####DESCRIPTIONEND####
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47 //
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48 //==========================================================================
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49
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50 #include <cyg/kernel/ktypes.h>
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51 #include <cyg/infra/cyg_ass.h> // assertion macros
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52
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53 // -------------------------------------------------------------------------
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54
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55 class Cyg_Alarm;
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56
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57 typedef void cyg_alarm_fn(Cyg_Alarm *alarm, CYG_ADDRWORD data);
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58
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59 // -------------------------------------------------------------------------
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60 // Counter object.
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61
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62 class Cyg_Counter
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63 {
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64
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65 friend class Cyg_Alarm;
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66
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67 #if defined(CYGIMP_KERNEL_COUNTERS_SINGLE_LIST)
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68
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69 Cyg_Alarm *alarm_list; // Linear list of Alarms
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70
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71 #elif defined(CYGIMP_KERNEL_COUNTERS_MULTI_LIST)
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72
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73 Cyg_Alarm *alarm_list[CYGNUM_KERNEL_COUNTERS_MULTI_LIST_SIZE];
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74
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75 #endif
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76
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77 volatile cyg_tick_count counter; // counter value
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78
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79 cyg_uint32 increment; // increment per tick
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80
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81 public:
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82
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83 CYGDBG_DEFINE_CHECK_THIS
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84
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85 Cyg_Counter(
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86 cyg_uint32 increment = 1
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87 );
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88
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89 ~Cyg_Counter();
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90
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91 // Return current value of counter
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92 cyg_tick_count current_value();
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93
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94 // Return low and high halves of the
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95 // counter value.
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96 cyg_uint32 current_value_lo();
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97 cyg_uint32 current_value_hi();
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98
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99 // Set the counter's current value
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100 void set_value( cyg_tick_count new_value);
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101
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102 // Advance counter by some number of ticks
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103 void tick( cyg_uint32 ticks = 1);
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104
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105 // Add an alarm to this counter
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106 void add_alarm( Cyg_Alarm *alarm );
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107
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108 // Remove an alarm from this counter
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109 void rem_alarm( Cyg_Alarm *alarm );
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110
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111 };
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112
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113 // -------------------------------------------------------------------------
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114 // Clock class. This is derived from a Counter and defines extra
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115 // features to support clock-like behaviour.
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116
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117 class Cyg_Clock
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118 : public Cyg_Counter
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119 {
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120
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121 public:
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122
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123 CYGDBG_DEFINE_CHECK_THIS
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124
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125 // This structure allows a more accurate representation
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126 // of the resolution than a single integer would allow.
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127 // The resolution is defined as dividend/divisor nanoseconds
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128 // per tick.
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129 struct cyg_resolution {
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130 cyg_uint32 dividend;
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131 cyg_uint32 divisor;
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132 };
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133
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134 private:
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135
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136 cyg_resolution resolution; // Current clock resolution
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137
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138 public:
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139
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140 Cyg_Clock( // Create clock with given resolution
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141 cyg_resolution resolution
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142 );
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143
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144 ~Cyg_Clock(); // Destructor
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145
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146 cyg_resolution get_resolution(); // Return current resolution
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147
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148 void set_resolution( // Set new resolution
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149 cyg_resolution resolution
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150 );
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151
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152 // There is a need for converting from "other" ticks to clock ticks.
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153 // We will construct 4 numbers to do the conversion as:
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154 // clock_ticks = (((otherticks*mul1)/div1)*mul2/div2)
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155 // with the values chosen to minimize the possibility of overflow.
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156 // Do the arithmetic in cyg_uint64s throughout.
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157 struct converter {
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158 cyg_uint64 mul1, div1, mul2, div2;
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159 };
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160
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161 // There are two of these because the 4 numbers are different depending
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162 // on the direction of the conversion, to prevent loss of significance.
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163 // NB these relate to the resolution of the clock object they are
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164 // called against, not necessarily "the" system real time clock.
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165 void get_other_to_clock_converter( cyg_uint64 ns_per_other_tick,
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166 struct converter *pcc );
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167
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168 void get_clock_to_other_converter( cyg_uint64 ns_per_other_tick,
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169 struct converter *pcc );
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170
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171 // A utility to perform the conversion in the obvious way, with
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172 // rounding to nearest at each stage. Static because it uses a
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173 // previously acquired converter.
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174 static cyg_tick_count convert( cyg_tick_count value,
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175 struct converter *pcc );
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176
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177 #ifdef CYGVAR_KERNEL_COUNTERS_CLOCK
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178
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179 // There is a system supplied real time clock...
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180
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181 static Cyg_Clock *real_time_clock;
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182
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183 #endif
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184
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185 };
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186
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187 // -------------------------------------------------------------------------
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188 // Alarm class. An alarm may be attached to a counter (or a clock) to be
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189 // called when the trigger value is reached.
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190
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191 class Cyg_Alarm
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192 {
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193 friend class Cyg_Counter;
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194
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195 #if defined(CYGIMP_KERNEL_COUNTERS_SINGLE_LIST) || defined(CYGIMP_KERNEL_COUNTERS_MULTI_LIST)
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196
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197 Cyg_Alarm *next; // next alarm in list
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198
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199 #endif
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200
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201 protected:
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202 Cyg_Counter *counter; // Attached to this counter/clock
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203
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204 cyg_alarm_fn *alarm; // Call-back function
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205
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206 CYG_ADDRWORD data; // Call-back data
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207
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208 cyg_tick_count trigger; // Absolute trigger time
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209
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210 cyg_tick_count interval; // Retrigger interval
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211
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212 cyg_bool enabled; // True if enabled
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213
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214 Cyg_Alarm();
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215
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216 void synchronize( void ); // deal with times in the past,
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217 // make next alarm in synch.
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218
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219 public:
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220
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221 CYGDBG_DEFINE_CHECK_THIS
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222
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223 Cyg_Alarm // Constructor
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224 (
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225 Cyg_Counter *counter, // Attached to this counter
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226 cyg_alarm_fn *alarm, // Call-back function
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227 CYG_ADDRWORD data // Call-back data
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228 );
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229
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230 ~Cyg_Alarm(); // Destructor
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231
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232 void initialize( // Initialize Alarm
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233 cyg_tick_count trigger, // Absolute trigger time
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234 cyg_tick_count interval = 0 // Relative retrigger interval
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235 );
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236
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237 void enable(); // Ensure alarm enabled
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238
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239 void disable(); // Ensure alarm disabled
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240
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241 void get_times(
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242 cyg_tick_count *trigger, // Next trigger time
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243 cyg_tick_count *interval // Current interval
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244 );
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245 };
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246
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247 // -------------------------------------------------------------------------
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248
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249 #endif // ifndef CYGONCE_KERNEL_CLOCK_HXX
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250 // EOF clock.hxx