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1 -- C960004.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 -- With the triggering statement being a delay and with the Asynchronous
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28 -- Select statement being in a tasking situation complete the abortable
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29 -- part before the delay expires. Check that the delay is cancelled
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30 -- and that the optional statements in the triggering part are not
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31 -- executed.
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32 --
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33 -- TEST DESCRIPTION:
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34 -- Simulate the creation of a carrier task to control the output of
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35 -- a message via a line driver. If the message sending process is
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36 -- not complete (the completion of the rendezvous) within a
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37 -- specified time the carrier task is designed to take corrective action.
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38 -- Use an asynchronous select to control the timing; arrange that
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39 -- the abortable part (the rendezvous) completes almost immediately.
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40 -- Check that the optional statements are not executed and that the
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41 -- test completes well before the time of the trigger delay request thus
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42 -- showing that it has been cancelled.
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43 --
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44 --
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45 -- CHANGE HISTORY:
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46 -- 06 Dec 94 SAIC ACVC 2.0
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47 --
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48 --!
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49
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50
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51 with Report;
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52 with Ada.Calendar;
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53
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54 procedure C960004 is
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55
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56 function "-" (Left, Right : Ada.Calendar.Time)
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57 return Duration renames Ada.Calendar."-";
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58 TC_Start_Time : Ada.Calendar.Time := Ada.Calendar.Clock;
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59 TC_Elapsed_Time : duration;
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60
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61 -- Note: a properly executing test will complete immediately.
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62 Allowable_ACK_Time : duration := 600.0;
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63
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64 begin
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65
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66 Report.Test ("C960004", "ATC: When abortable part completes before " &
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67 "a triggering delay, check that the delay " &
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68 "is cancelled & optional statements " &
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69 "are not performed. Tasking situation");
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70
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71 declare -- To get the Report.Result after all has completed
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72
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73 type Sequence_Number is range 1..1_999_999; -- Message Number
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74 subtype S_length_subtype is integer range 1..80;
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75
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76 type Message_Type (Max_String : S_length_subtype := 1) is
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77 record
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78 Message_Number : Sequence_Number;
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79 Alpha : string(1..Max_String);
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80 end record;
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81
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82 -- TC: Dummy message for the test
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83 Dummy_Alpha : constant string := "This could be printed";
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84 Message_to_Send : Message_Type (Max_string => Dummy_Alpha'length);
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85
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86
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87 -- This is the carrier task. One of these is created for each
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88 -- message that requires ACK
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89 --
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90 task type Require_ACK_task is
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91 entry Message_In (Message_to_Send: Message_Type);
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92 end Require_ACK_task;
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93 type acc_Require_ACK_task is access Require_ACK_task;
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94
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95
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96 --:::::::::::::::::::::::::::::::::
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97 -- There would also be another task type "No_ACK_Task" which would
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98 -- be the carrier task for those messages not requiring an ACK.
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99 -- This task would call Send_Message.ACK_Not_Required. It is not
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100 -- shown in this test as it is not used.
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101 --:::::::::::::::::::::::::::::::::
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102
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103
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104
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105 task Send_Message is
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106 entry ACK_Required (Message_to_Send: Message_Type);
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107 entry ACK_Not_Required (Message_to_Send: Message_Type);
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108 end Send_Message;
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109
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110
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111 -- This is the carrier task. One of these is created for each
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112 -- message that requires ACK
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113 --
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114 task body Require_ACK_task is
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115 Hold_Message : Message_Type;
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116
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117 procedure Time_Out (Failed_Message_Number : Sequence_Number) is
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118 begin
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119 -- Take remedial action on the timed-out message
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120 null; -- stub
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121
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122 Report.Failed ("Optional statements in triggering part" &
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123 " were performed");
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124 end Time_out;
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125
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126 begin
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127 accept Message_In (Message_to_Send: Message_Type) do
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128 Hold_Message := Message_to_Send; -- to release caller
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129 end Message_In;
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130
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131 -- Now put the message out to the Send_Message task and
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132 -- wait (no more than Allowable_Ack_Time) for its completion
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133 --
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134 select
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135 delay Allowable_ACK_Time;
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136 -- ACK not received in specified time
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137 Time_out (Hold_Message.Message_Number);
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138 then abort
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139 -- If the rendezvous is not completed in the above time, this
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140 -- call is cancelled
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141 -- Note: for this test this call will complete immediately
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142 -- and thus the trigger should be cancelled
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143 Send_Message.ACK_Required (Hold_Message);
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144 end select;
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145
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146 exception
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147 when others =>
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148 Report.Failed ("Unexpected exception in Require_ACK_task");
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149 end Require_ACK_task;
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150
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151
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152 -- This is the Line Driver task
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153 --
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154 task body Send_Message is
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155 Hold_Non_ACK_Message : Message_Type;
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156 begin
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157 loop
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158 select
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159 accept ACK_Required (Message_to_Send: Message_Type) do
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160 -- Here send the message from within the rendezvous
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161 -- waiting for full transmission to complete
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162 null; -- stub
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163 -- Note: In this test this accept will complete immediately
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164 end ACK_Required;
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165 or
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166 accept ACK_Not_Required (Message_to_Send: Message_Type) do
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167 Hold_Non_ACK_Message := Message_to_Send;
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168 end ACK_Not_Required;
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169 -- Here send the message from outside the rendezvous
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170 null; -- stub
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171 or
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172 terminate;
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173 end select;
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174 end loop;
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175 exception
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176 when others => Report.Failed ("Unexpected exception in Send_Message");
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177 end Send_Message;
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178
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179 begin -- declare
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180 -- Build a dummy message
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181 Message_to_Send.Alpha := Dummy_Alpha;
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182 Message_to_Send.Message_Number := 110_693;
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183
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184 declare
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185 New_Require_ACK_task : acc_Require_ACK_task :=
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186 new Require_ACK_task;
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187 begin
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188 -- Create a carrier task for this message and pass the latter in
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189 New_Require_ACK_task.Message_In (Message_to_Send);
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190 end; -- declare
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191
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192 end; -- declare
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193
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194 --Once we are out of the above declarative region, all tasks have completed
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195
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196 TC_Elapsed_Time := Ada.Calendar.Clock - TC_Start_Time;
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197
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198 -- Check that the test has completed well before the time of the requested
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199 -- delay to ensure the delay was cancelled
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200 --
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201 if (TC_Elapsed_Time > Allowable_ACK_Time/2) then
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202 Report.Failed ("Triggering delay statement was not cancelled");
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203 end if;
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204
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205 Report.Result;
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206 end C960004;
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