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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT RUN-TIME COMPONENTS --
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4 -- --
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5 -- A D A . R E A L _ T I M E --
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6 -- --
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7 -- S p e c --
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8 -- --
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145
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9 -- Copyright (C) 1992-2019, Free Software Foundation, Inc. --
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111
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10 -- --
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11 -- This specification is derived from the Ada Reference Manual for use with --
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12 -- GNAT. The copyright notice above, and the license provisions that follow --
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13 -- apply solely to the contents of the part following the private keyword. --
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14 -- --
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15 -- GNAT is free software; you can redistribute it and/or modify it under --
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16 -- terms of the GNU General Public License as published by the Free Soft- --
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17 -- ware Foundation; either version 3, or (at your option) any later ver- --
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18 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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19 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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20 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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21 -- --
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22 -- As a special exception under Section 7 of GPL version 3, you are granted --
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23 -- additional permissions described in the GCC Runtime Library Exception, --
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24 -- version 3.1, as published by the Free Software Foundation. --
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25 -- --
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26 -- You should have received a copy of the GNU General Public License and --
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27 -- a copy of the GCC Runtime Library Exception along with this program; --
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28 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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29 -- <http://www.gnu.org/licenses/>. --
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30 -- --
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31 -- GNAT was originally developed by the GNAT team at New York University. --
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32 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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33 -- --
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34 ------------------------------------------------------------------------------
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35
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36 with System.Task_Primitives.Operations;
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37 pragma Elaborate_All (System.Task_Primitives.Operations);
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38
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39 package Ada.Real_Time with
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40 SPARK_Mode,
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41 Abstract_State => (Clock_Time with Synchronous),
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42 Initializes => Clock_Time
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43 is
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44
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45 pragma Compile_Time_Error
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46 (Duration'Size /= 64,
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47 "this version of Ada.Real_Time requires 64-bit Duration");
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48
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49 type Time is private;
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50 Time_First : constant Time;
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51 Time_Last : constant Time;
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52 Time_Unit : constant := 10#1.0#E-9;
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53
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54 type Time_Span is private;
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55 Time_Span_First : constant Time_Span;
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56 Time_Span_Last : constant Time_Span;
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57 Time_Span_Zero : constant Time_Span;
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58 Time_Span_Unit : constant Time_Span;
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59
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60 Tick : constant Time_Span;
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61 function Clock return Time with
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62 Volatile_Function,
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63 Global => Clock_Time;
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64
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65 function "+" (Left : Time; Right : Time_Span) return Time with
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66 Global => null;
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67 function "+" (Left : Time_Span; Right : Time) return Time with
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68 Global => null;
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69 function "-" (Left : Time; Right : Time_Span) return Time with
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70 Global => null;
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71 function "-" (Left : Time; Right : Time) return Time_Span with
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72 Global => null;
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73
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74 function "<" (Left, Right : Time) return Boolean with
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75 Global => null;
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76 function "<=" (Left, Right : Time) return Boolean with
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77 Global => null;
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78 function ">" (Left, Right : Time) return Boolean with
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79 Global => null;
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80 function ">=" (Left, Right : Time) return Boolean with
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81 Global => null;
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82
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83 function "+" (Left, Right : Time_Span) return Time_Span with
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84 Global => null;
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85 function "-" (Left, Right : Time_Span) return Time_Span with
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86 Global => null;
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87 function "-" (Right : Time_Span) return Time_Span with
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88 Global => null;
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89 function "*" (Left : Time_Span; Right : Integer) return Time_Span with
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90 Global => null;
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91 function "*" (Left : Integer; Right : Time_Span) return Time_Span with
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92 Global => null;
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93 function "/" (Left, Right : Time_Span) return Integer with
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94 Global => null;
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95 function "/" (Left : Time_Span; Right : Integer) return Time_Span with
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96 Global => null;
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97
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98 function "abs" (Right : Time_Span) return Time_Span with
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99 Global => null;
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100
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101 function "<" (Left, Right : Time_Span) return Boolean with
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102 Global => null;
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103 function "<=" (Left, Right : Time_Span) return Boolean with
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104 Global => null;
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105 function ">" (Left, Right : Time_Span) return Boolean with
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106 Global => null;
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107 function ">=" (Left, Right : Time_Span) return Boolean with
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108 Global => null;
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109
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110 function To_Duration (TS : Time_Span) return Duration with
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111 Global => null;
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112 function To_Time_Span (D : Duration) return Time_Span with
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113 Global => null;
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114
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115 function Nanoseconds (NS : Integer) return Time_Span with
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116 Global => null;
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117 function Microseconds (US : Integer) return Time_Span with
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118 Global => null;
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119 function Milliseconds (MS : Integer) return Time_Span with
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120 Global => null;
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121
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122 function Seconds (S : Integer) return Time_Span with
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123 Global => null;
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124 pragma Ada_05 (Seconds);
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125
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126 function Minutes (M : Integer) return Time_Span with
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127 Global => null;
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128 pragma Ada_05 (Minutes);
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129
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130 type Seconds_Count is new Long_Long_Integer;
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131 -- Seconds_Count needs 64 bits, since the type Time has the full range of
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132 -- Duration. The delta of Duration is 10 ** (-9), so the maximum number of
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133 -- seconds is 2**63/10**9 = 8*10**9 which does not quite fit in 32 bits.
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134 -- However, rather than make this explicitly 64-bits we derive from
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135 -- Long_Long_Integer. In normal usage this will have the same effect. But
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136 -- in the case of CodePeer with a target configuration file with a maximum
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137 -- integer size of 32, it allows analysis of this unit.
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138
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139 procedure Split (T : Time; SC : out Seconds_Count; TS : out Time_Span)
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140 with
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141 Global => null;
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142 function Time_Of (SC : Seconds_Count; TS : Time_Span) return Time
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143 with
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144 Global => null;
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145
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146 private
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147 pragma SPARK_Mode (Off);
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148
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149 -- Time and Time_Span are represented in 64-bit Duration value in
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150 -- nanoseconds. For example, 1 second and 1 nanosecond is represented
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151 -- as the stored integer 1_000_000_001. This is for the 64-bit Duration
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152 -- case, not clear if this also is used for 32-bit Duration values.
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153
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154 type Time is new Duration;
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155
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156 Time_First : constant Time := Time'First;
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157
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158 Time_Last : constant Time := Time'Last;
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159
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160 type Time_Span is new Duration;
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161
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162 Time_Span_First : constant Time_Span := Time_Span'First;
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163
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164 Time_Span_Last : constant Time_Span := Time_Span'Last;
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165
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166 Time_Span_Zero : constant Time_Span := 0.0;
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167
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168 Time_Span_Unit : constant Time_Span := 10#1.0#E-9;
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169
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170 Tick : constant Time_Span :=
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171 Time_Span (System.Task_Primitives.Operations.RT_Resolution);
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172
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173 pragma Import (Intrinsic, "<");
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174 pragma Import (Intrinsic, "<=");
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175 pragma Import (Intrinsic, ">");
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176 pragma Import (Intrinsic, ">=");
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177 pragma Import (Intrinsic, "abs");
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178
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179 pragma Inline (Microseconds);
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180 pragma Inline (Milliseconds);
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181 pragma Inline (Nanoseconds);
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182 pragma Inline (Seconds);
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183 pragma Inline (Minutes);
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184
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185 end Ada.Real_Time;
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