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111
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1 -- C954017.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 when an exception is raised in the rendezvous of a task
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28 -- that was called by a requeue the exception is propagated to the
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29 -- original caller and that the requeuing task is unaffected.
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30 --
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31 -- TEST DESCRIPTION:
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32 -- The Intermediate task requeues a call from the Original_Caller to the
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33 -- Receiver. While the Receiver is in the accept body for this
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34 -- rendezvous a Constraint_Error exception is raised. Check that the
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35 -- exception is propagated to the Original_Caller, that the Receiver's
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36 -- normal exception logic is employed and that the Intermediate task
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37 -- is undisturbed.
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38 -- There are several delay loops in this test any one of which could
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39 -- cause it to hang (and thus fail).
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40 --
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41 --
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42 -- CHANGE HISTORY:
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43 -- 06 Dec 94 SAIC ACVC 2.0
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44 -- 25 Nov 95 SAIC Fixed shared global variable problem for
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45 -- ACVC 2.0.1
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46 --
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47 --!
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48
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49 with Report;
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50 with ImpDef;
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51
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52
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53 procedure C954017 is
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54
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55 TC_Original_Caller_Complete : Boolean := false;
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56 TC_Intermediate_Complete : Boolean := false;
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57 TC_Receiver_Complete : Boolean := false;
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58 TC_Exception : Exception;
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59
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60
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61 protected type Shared_Boolean (Initial_Value : Boolean := False) is
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62 procedure Set_True;
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63 procedure Set_False;
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64 function Value return Boolean;
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65 private
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66 Current_Value : Boolean := Initial_Value;
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67 end Shared_Boolean;
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68
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69 protected body Shared_Boolean is
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70 procedure Set_True is
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71 begin
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72 Current_Value := True;
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73 end Set_True;
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74
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75 procedure Set_False is
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76 begin
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77 Current_Value := False;
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78 end Set_False;
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79
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80 function Value return Boolean is
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81 begin
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82 return Current_Value;
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83 end Value;
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84 end Shared_Boolean;
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85
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86 TC_Exception_Process_Complete : Shared_Boolean (False);
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87
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88 task Original_Caller is
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89 entry Start;
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90 end Original_Caller;
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91
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92 task Intermediate is
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93 entry Input;
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94 end Intermediate;
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95
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96 task Receiver is
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97 entry Input;
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98 end Receiver;
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99
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100
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101 task body Original_Caller is
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102 begin
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103 accept Start; -- wait for the trigger from Main
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104
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105 Intermediate.Input;
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106 Report.Failed ("Exception not propagated to Original_Caller");
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107
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108 exception
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109 when TC_Exception =>
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110 TC_Original_Caller_Complete := true; -- Expected behavior
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111 when others =>
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112 Report.Failed ("Unexpected Exception in Original_Caller task");
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113 end Original_Caller;
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114
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115
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116 task body Intermediate is
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117 begin
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118 accept Input do
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119 -- Within this accept call another task
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120 requeue Receiver.Input with abort;
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121 end Input;
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122
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123 -- Wait for Main to ensure that the exception housekeeping is finished
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124 while not TC_Exception_Process_Complete.Value loop
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125 delay ImpDef.Minimum_Task_Switch;
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126 end loop;
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127
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128 TC_Intermediate_Complete := true;
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129
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130 exception
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131 when others =>
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132 Report.Failed ("Unexpected exception in Intermediate task");
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133 end Intermediate;
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134
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135
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136 task body Receiver is
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137 --
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138 begin
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139 accept Input do
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140 null; -- the user code for the rendezvous is stubbed out
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141
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142 -- Test Control: Raise an exception in the destination task which
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143 -- should then be propagated
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144 raise TC_Exception;
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145
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146 end Input;
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147 exception
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148 when TC_Exception =>
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149 TC_Receiver_Complete := true; -- expected behavior
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150 when others =>
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151 Report.Failed ("Unexpected Exception in Receiver Task");
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152 end Receiver;
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153
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154
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155 begin
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156
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157 Report.Test ("C954017", "Requeue: exception processing");
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158
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159 Original_Caller.Start; -- Start the test after the Report.Test
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160
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161 -- Wait for the whole of the exception process to complete
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162 while not ( Original_Caller'terminated and Receiver'terminated ) loop
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163 delay ImpDef.Minimum_Task_Switch;
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164 end loop;
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165
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166 -- Inform the Intermediate task that the process is complete to allow
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167 -- it to continue to completion itself
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168 TC_Exception_Process_Complete.Set_True;
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169
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170 -- Wait for everything to settle before reporting the result
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171 while not ( Intermediate'terminated ) loop
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172 delay ImpDef.Minimum_Task_Switch;
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173 end loop;
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174
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175
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176 if not ( TC_Original_Caller_Complete and
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177 TC_Intermediate_Complete and
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178 TC_Receiver_Complete) then
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179 Report.Failed ("Proper paths not traversed");
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180 end if;
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181
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182 Report.Result;
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183
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184 end C954017;
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