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1 -- C974008.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 abortable part of an asynchronous select statement
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28 -- is not started if the triggering statement is a task entry call, and
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29 -- the entry call is not queued.
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30 --
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31 -- Check that the sequence of statements of the triggering alternative
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32 -- is executed after the abortable part is left.
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33 --
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34 -- TEST DESCRIPTION:
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35 -- Declare a main procedure containing an asynchronous select with a task
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36 -- entry call as triggering statement. Ensure that the task is waiting
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37 -- at the accept statement so the rendezvous is executed immediately (the
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38 -- entry call is not queued).
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39 --
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40 --
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41 -- CHANGE HISTORY:
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42 -- 06 Dec 94 SAIC ACVC 2.0
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43 --
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44 --!
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45
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46 package C974008_0 is -- Automated teller machine abstraction.
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47
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48
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49 -- Flags for testing purposes:
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50
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51 Triggering_Statement_Completed : Boolean := False;
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52 Count : Integer := 1234; -- Global to defeat
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53 -- optimization.
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54
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55 type Key_Enum is (None, Cancel, Deposit, Withdraw);
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56
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57 type Card_Number_Type is private;
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58 type Card_PIN_Type is private;
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59 type ATM_Card_Type is private;
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60
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61
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62 Transaction_Canceled : exception;
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63
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64
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65 task type ATM_Keyboard_Task is
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66 entry Cancel_Pressed;
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67 end ATM_Keyboard_Task;
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68
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69
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70 procedure Read_Card (Card : in out ATM_Card_Type);
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71
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72
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73 procedure Perform_Transaction (Card : in ATM_Card_Type);
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74
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75 private
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76
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77 type Card_Number_Type is range 1 .. 9999;
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78 type Card_PIN_Type is range 100 .. 999;
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79
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80 type ATM_Card_Type is record
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81 Number : Card_Number_Type;
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82 PIN : Card_PIN_Type;
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83 end record;
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84
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85 end C974008_0;
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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 with Report;
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92 package body C974008_0 is
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93
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94
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95 procedure Listen_For_Input (Key : out Key_Enum) is
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96 begin
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97 -- Simulate the situation where the user presses the cancel key
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98 -- before the card is validated
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99
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100 -- press the cancel key immediately
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101 Key := Cancel;
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102
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103 end Listen_For_Input;
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104
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105
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106
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107 -- One of these gets created as "Keyboard" for each transaction
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108 --
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109 task body ATM_Keyboard_Task is
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110 Key_Pressed : Key_Enum := None;
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111 begin
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112 -- NOTE: Normal usage for this routine would be the loop with
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113 -- the select statement included. This particular test
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114 -- requires that the task be waiting at the accept
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115 -- for the call. To ensure that this is the case the
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116 -- extraneous commands are commented out (we leave them
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117 -- in this form to show the reader the surrounds to the
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118 -- fragment of code remaining)
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119
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120 -- loop
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121
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122 Listen_For_Input (Key_Pressed);
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123
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124 -- select
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125 -- when (Key_Pressed = Cancel) => -- Guard is now
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126 accept Cancel_Pressed do -- true, so accept
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127 Triggering_Statement_Completed := True; -- queued entry
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128 end Cancel_Pressed; -- call.
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129
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130 -- User has cancelled the transaction so we exit the
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131 -- loop and allow the task to terminate
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132 -- exit;
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133 -- else
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134 -- Key_Pressed := None;
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135 -- end select;
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136
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137 -- end loop;
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138 exception
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139 when others =>
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140 Report.Failed ("Unexpected Exception in ATM_Keyboard_Task");
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141 end ATM_Keyboard_Task;
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142
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143
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144
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145 procedure Read_Card (Card : in out ATM_Card_Type) is
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146 begin
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147 Card.Number := 9999;
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148 Card.PIN := 111;
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149 end Read_Card;
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150
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151
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152 procedure Perform_Transaction (Card : in ATM_Card_Type) is
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153 begin
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154 Report.Failed ("Triggering alternative sequence of statements " &
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155 "not executed");
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156 if not Triggering_Statement_Completed then
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157 Report.Failed ("Triggering statement did not complete");
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158 end if;
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159 end Perform_Transaction;
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160
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161
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162 end C974008_0;
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163
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164
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165 --==================================================================--
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166
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167
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168 with Report;
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169 with ImpDef;
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170
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171 with C974008_0; -- Automated teller machine abstraction.
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172 use C974008_0;
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173
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174 procedure C974008 is
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175
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176 Card_Data : ATM_Card_Type;
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177
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178 begin -- Main program.
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179
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180 Report.Test ("C974008", "Asynchronous Select: Trigger is a call to a " &
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181 "waiting task entry and completes immediately");
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182
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183 Read_Card (Card_Data);
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184
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185 declare
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186 -- Create the task for this transaction
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187 Keyboard : C974008_0.ATM_Keyboard_Task;
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188 begin
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189
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190 -- Ensure task is waiting at the accept
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191 -- This is the time required to activate another task and allow it
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192 -- to run to its first accept statement.
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193 --
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194 delay ImpDef.Switch_To_New_Task;
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195
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196 -- --
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197 -- Asynchronous select is tested here --
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198 -- --
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199
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200 select
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201 Keyboard.Cancel_Pressed; -- Entry call is executed immediately
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202
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203 raise Transaction_Canceled; -- This is executed after Validate_Card
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204 -- is aborted.
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205 then abort
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206
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207 -- In other similar tests Validate_Card is called here. In this
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208 -- test we just check to see if the abortable part is called at
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209 -- all. Since the triggering call is not queued the abortable
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210 -- part should not be started
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211 --
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212 Report.Failed ("Abortable part started");
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213
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214 end select;
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215
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216 Perform_Transaction (Card_Data); -- Should not be reached.
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217 exception
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218 when Transaction_Canceled =>
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219
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220 if not Triggering_Statement_Completed then
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221 Report.Failed ("Triggering alternative sequence of statements " &
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222 "executed but triggering statement not complete");
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223 end if;
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224
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225 end;
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226
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227 Report.Result;
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228
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229 end C974008;
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