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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 . E X E C U T I O N _ 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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9 -- This specification is derived from the Ada Reference Manual for use with --
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10 -- GNAT. In accordance with the copyright of that document, you can freely --
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11 -- copy and modify this specification, provided that if you redistribute a --
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12 -- modified version, any changes that you have made are clearly indicated. --
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13 -- --
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14 ------------------------------------------------------------------------------
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15
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16 -- This unit is not implemented in typical GNAT implementations that lie on
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17 -- top of operating systems, because it is infeasible to implement in such
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18 -- environments.
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19
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20 -- If a target environment provides appropriate support for this package
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21 -- then the Unimplemented_Unit pragma should be removed from this spec and
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22 -- an appropriate body provided.
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23
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24 with Ada.Task_Identification;
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25 with Ada.Real_Time;
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26
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27 package Ada.Execution_Time with
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28 SPARK_Mode
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29 is
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30 pragma Preelaborate;
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31
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32 pragma Unimplemented_Unit;
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33
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34 type CPU_Time is private;
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35
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36 CPU_Time_First : constant CPU_Time;
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37 CPU_Time_Last : constant CPU_Time;
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38 CPU_Time_Unit : constant := 0.000001;
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39 CPU_Tick : constant Ada.Real_Time.Time_Span;
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40
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41 use type Ada.Task_Identification.Task_Id;
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42
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43 function Clock
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44 (T : Ada.Task_Identification.Task_Id :=
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45 Ada.Task_Identification.Current_Task)
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46 return CPU_Time
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47 with
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48 Volatile_Function,
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49 Global => Ada.Real_Time.Clock_Time,
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50 Pre => T /= Ada.Task_Identification.Null_Task_Id;
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51
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52 function "+"
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53 (Left : CPU_Time;
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54 Right : Ada.Real_Time.Time_Span) return CPU_Time
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55 with
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56 Global => null;
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57
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58 function "+"
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59 (Left : Ada.Real_Time.Time_Span;
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60 Right : CPU_Time) return CPU_Time
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61 with
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62 Global => null;
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63
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64 function "-"
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65 (Left : CPU_Time;
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66 Right : Ada.Real_Time.Time_Span) return CPU_Time
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67 with
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68 Global => null;
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69
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70 function "-"
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71 (Left : CPU_Time;
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72 Right : CPU_Time) return Ada.Real_Time.Time_Span
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73 with
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74 Global => null;
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75
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76 function "<" (Left, Right : CPU_Time) return Boolean with
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77 Global => null;
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78 function "<=" (Left, Right : CPU_Time) return Boolean with
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79 Global => null;
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80 function ">" (Left, Right : CPU_Time) return Boolean with
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81 Global => null;
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82 function ">=" (Left, Right : CPU_Time) return Boolean with
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83 Global => null;
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84
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85 procedure Split
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86 (T : CPU_Time;
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87 SC : out Ada.Real_Time.Seconds_Count;
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88 TS : out Ada.Real_Time.Time_Span)
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89 with
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90 Global => null;
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91
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92 function Time_Of
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93 (SC : Ada.Real_Time.Seconds_Count;
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94 TS : Ada.Real_Time.Time_Span := Ada.Real_Time.Time_Span_Zero)
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95 return CPU_Time
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96 with
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97 Global => null;
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98
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99 Interrupt_Clocks_Supported : constant Boolean := False;
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100 Separate_Interrupt_Clocks_Supported : constant Boolean := False;
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101
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102 pragma Warnings (Off, "check will fail at run time");
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103 function Clock_For_Interrupts return CPU_Time with
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104 Volatile_Function,
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105 Global => Ada.Real_Time.Clock_Time,
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106 Pre => Interrupt_Clocks_Supported;
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107 pragma Warnings (On, "check will fail at run time");
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108
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109 private
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110 pragma SPARK_Mode (Off);
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111
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112 type CPU_Time is new Ada.Real_Time.Time;
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113
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114 CPU_Time_First : constant CPU_Time := CPU_Time (Ada.Real_Time.Time_First);
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115 CPU_Time_Last : constant CPU_Time := CPU_Time (Ada.Real_Time.Time_Last);
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116
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117 CPU_Tick : constant Ada.Real_Time.Time_Span := Ada.Real_Time.Tick;
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118
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119 end Ada.Execution_Time;
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