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1 -- C974002.A
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2 --
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3 -- Grant of Unlimited Rights
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4 --
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5 -- Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
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6 -- F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
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7 -- unlimited rights in the software and documentation contained herein.
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8 -- Unlimited rights are defined in DFAR 252.227-7013(a)(19). By making
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9 -- this public release, the Government intends to confer upon all
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10 -- recipients unlimited rights equal to those held by the Government.
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11 -- These rights include rights to use, duplicate, release or disclose the
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12 -- released technical data and computer software in whole or in part, in
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13 -- any manner and for any purpose whatsoever, and to have or permit others
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14 -- to do so.
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15 --
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16 -- DISCLAIMER
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17 --
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18 -- ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
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19 -- DISCLOSED ARE AS IS. THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
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20 -- WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
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21 -- SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
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22 -- OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
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23 -- PARTICULAR PURPOSE OF SAID MATERIAL.
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24 --*
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25 --
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26 -- OBJECTIVE:
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27 -- Check that the sequence of statements of the triggering alternative
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28 -- of an asynchronous select statement is executed if the triggering
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29 -- statement is a delay_until statement, and the specified time has
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30 -- already passed. Check that the abortable part is not executed after
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31 -- the sequence of statements of the triggering alternative is left.
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32 --
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33 -- Check that the sequence of statements of the triggering alternative
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34 -- of an asynchronous select statement is not executed if the abortable
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35 -- part completes before the triggering statement, and the triggering
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36 -- statement is a delay_until statement.
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37 --
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38 -- TEST DESCRIPTION:
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39 -- Declare a task with an accept statement containing an asynchronous
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40 -- select with a delay_until triggering statement. Parameterize
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41 -- the accept statement with the time to be used in the delay. Simulate
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42 -- a quick calculation by declaring a procedure which sets a Boolean
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43 -- flag. Call this procedure in the abortable part.
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44 --
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45 -- Make two calls to the task entry: (1) with a time that has already
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46 -- expired, and (2) with a time that will not expire before the quick
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47 -- calculation completes.
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48 --
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49 -- For (1), the sequence of statements following the triggering statement
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50 -- is executed, and the abortable part never starts.
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51 --
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52 -- For (2), the abortable part completes before the triggering statement,
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53 -- the delay is canceled, and the sequence of statements following the
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54 -- triggering statement never starts.
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55 --
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56 --
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57 -- CHANGE HISTORY:
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58 -- 06 Dec 94 SAIC ACVC 2.0
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59 -- 26 Nov 95 SAIC Bug fix for ACVC 2.0.1.
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60 --
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61 --!
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62
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63 with Report;
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64 with Ada.Calendar;
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65 with ImpDef;
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66 procedure C974002 is
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67
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68 function "-" (Left: Ada.Calendar.Time; Right: Duration )
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69 return Ada.Calendar.Time renames Ada.Calendar."-";
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70 function "+" (Left: Ada.Calendar.Time; Right: Duration )
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71 return Ada.Calendar.Time renames Ada.Calendar."+";
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72
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73 Abortable_Part_Executed : Boolean;
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74 Triggering_Alternative_Executed : Boolean;
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75
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76
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77 --========================================================--
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78
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79
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80 procedure Quick_Calculation is
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81 begin
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82 if Report.Equal (1, 1) then
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83 Abortable_Part_Executed := True;
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84 end if;
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85 end Quick_Calculation;
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86
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87
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88 --========================================================--
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89
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90
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91 task type Timed_Calculation_Task is
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92 entry Calculation (Time_Out : in Ada.Calendar.Time);
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93 end Timed_Calculation_Task;
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94
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95
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96 task body Timed_Calculation_Task is
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97 begin
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98 loop
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99 select
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100 accept Calculation (Time_Out : in Ada.Calendar.Time) do
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101
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102 -- --
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103 -- Asynchronous select is tested here --
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104 -- --
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105
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106 select
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107 delay until Time_Out; -- Triggering
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108 -- statement.
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109
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110 Triggering_Alternative_Executed := True; -- Triggering
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111 -- alternative.
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112 then abort
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113 Quick_Calculation; -- Abortable part.
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114 end select;
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115 end Calculation;
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116 or
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117 terminate;
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118 end select;
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119 end loop;
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120 exception
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121 when others =>
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122 Report.Failed ("Unexpected exception in Timed_Calculation_Task");
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123 end Timed_Calculation_Task;
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124
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125
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126 --========================================================--
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127
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128
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129 Start_Time : constant Ada.Calendar.Time :=
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130 Ada.Calendar.Time_of (1901,1,1);
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131 Minute : constant Duration := 60.0;
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132
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133
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134 --========================================================--
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135
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136
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137 begin -- Main program.
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138
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139 Report.Test ("C974002", "Asynchronous Select with Delay_Until");
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140
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141 -- take care of implementations that start the clock at 1/1/01
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142 delay ImpDef.Delay_For_Time_Past;
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143
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144
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145 Abortable_Part_Executed := False;
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146 Triggering_Alternative_Executed := False;
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147
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148 NO_DELAY_SUBTEST:
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149
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150 declare
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151 -- Set Expiry to a time which has already passed
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152 Expiry : constant Ada.Calendar.Time := Start_Time;
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153 Timed : Timed_Calculation_Task;
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154 begin
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155
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156 -- Expiry is the time to be specified in the delay_until statement
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157 -- of the asynchronous select. Since it has already passed, the
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158 -- abortable part should not execute, and the sequence of statements
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159 -- of the triggering alternative should be executed.
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160
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161 Timed.Calculation (Time_Out => Expiry); -- Asynchronous select
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162 -- inside accept block.
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163 if Abortable_Part_Executed then
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164 Report.Failed ("No delay: Abortable part was executed");
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165 end if;
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166
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167 if not Triggering_Alternative_Executed then
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168 Report.Failed ("No delay: triggering alternative sequence " &
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169 "of statements was not executed");
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170 end if;
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171 end No_Delay_Subtest;
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172
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173
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174 Abortable_Part_Executed := False;
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175 Triggering_Alternative_Executed := False;
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176
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177 LONG_DELAY_SUBTEST:
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178
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179 declare
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180
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181 -- Quick_Calculation should finish before expiry.
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182 Expiry : constant Ada.Calendar.Time :=
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183 Ada.Calendar.Clock + Minute;
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184 Timed : Timed_Calculation_Task;
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185
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186 begin
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187
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188 -- Expiry is the time to be specified in the delay_until statement
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189 -- of the asynchronous select. It should not pass before the abortable
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190 -- part completes, at which time control should return to the caller;
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191 -- the sequence of statements of the triggering alternative should
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192 -- not be executed.
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193
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194 Timed.Calculation (Time_Out => Expiry); -- Asynchronous select.
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195
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196 if not Abortable_Part_Executed then
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197 Report.Failed ("Long delay: Abortable part was not executed");
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198 end if;
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199
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200 if Triggering_Alternative_Executed then
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201 Report.Failed ("Long delay: triggering alternative sequence " &
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202 "of statements was executed");
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203 end if;
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204 end Long_Delay_Subtest;
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205
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206
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207 Report.Result;
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208
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209 end C974002;
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