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111
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1 -- CB20007.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 exceptions are raised and can be directly propagated to
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28 -- the calling unit by protected operations.
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29 --
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30 -- TEST DESCRIPTION:
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31 -- Declare a package with a protected type, including protected operation
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32 -- declarations and private data, simulating a counting semaphore.
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33 -- In the main procedure, perform calls on protected operations
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34 -- of the protected object designed to induce the raising of exceptions.
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35 --
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36 -- The exceptions raised are to be propagated directly from the protected
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37 -- operations to the calling unit.
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38 --
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39 -- Ensure that the exceptions are raised and correctly propagated directly
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40 -- to the calling unit from protected procedures and functions.
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41 --
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42 --
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43 -- CHANGE HISTORY:
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44 -- 06 Dec 94 SAIC ACVC 2.0
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45 --
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46 --!
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47
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48 package CB20007_0 is -- Package Semaphore.
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49
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50 Handled_In_Function_Caller,
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51 Handled_In_Procedure_Caller : Boolean := False;
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52
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53 Resource_Overflow,
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54 Resource_Underflow : exception;
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55
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56 protected type Counting_Semaphore (Max_Resources : Integer) is
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57 procedure Secure;
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58 function Resource_Limit_Exceeded return Boolean;
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59 procedure Release;
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60 private
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61 Count : Integer := Max_Resources;
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62 end Counting_Semaphore;
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63
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64 end CB20007_0;
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65
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66 --=================================================================--
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67
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68 with Report;
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69
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70 package body CB20007_0 is -- Package Semaphore.
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71
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72 protected body Counting_Semaphore is
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73
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74 procedure Secure is
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75 begin
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76 if (Count = 0) then -- No resources left to secure.
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77 raise Resource_Underflow;
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78 Report.Failed ("Program control not transferred by raise");
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79 else
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80 Count := Count - 1; -- Available resources decremented.
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81 end if;
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82 -- No exception handlers here, direct propagation to calling unit.
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83 end Secure;
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84
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85
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86 function Resource_Limit_Exceeded return Boolean is
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87 begin
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88 if (Count > Max_Resources) then
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89 raise Resource_Overflow; -- Exception used as control flow
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90 -- mechanism.
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91 Report.Failed ("Program control not transferred by raise");
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92 else
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93 return (False);
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94 end if;
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95 -- No exception handlers here, direct propagation to calling unit.
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96 end Resource_Limit_Exceeded;
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97
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98
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99 procedure Release is
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100 begin
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101 Count := Count + 1; -- Count of resources available
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102 -- incremented.
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103 if Resource_Limit_Exceeded then -- Call to protected operation
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104 Count := Count - 1; -- function that raises an
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105 -- exception.
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106 Report.Failed("Resource limit exceeded");
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107 end if;
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108 -- No exception handler here for exception raised in function.
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109 -- Exception will propagate directly to calling unit.
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110 end Release;
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111
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112
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113 end Counting_Semaphore;
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114
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115 end CB20007_0;
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116
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117
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118 --=================================================================--
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119
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120
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121 with CB20007_0; -- Package Semaphore.
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122 with Report;
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123
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124 procedure CB20007 is
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125 begin
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126
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127 Test_Block:
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128 declare
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129
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130 package Semaphore renames CB20007_0;
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131
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132 Total_Resources_Available : constant := 1;
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133
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134 Resources : Semaphore.Counting_Semaphore (Total_Resources_Available);
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135 -- An object of protected type.
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136
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137 begin
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138
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139 Report.Test ("CB20007", "Check that exceptions are raised and can " &
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140 "be directly propagated to the calling unit " &
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141 "by protected operations" );
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142
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143 Allocate_Resources:
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144 declare
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145 Loop_Count : Integer := Total_Resources_Available + 1;
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146 begin -- Force exception.
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147 for I in 1..Loop_Count loop
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148 Resources.Secure;
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149 end loop;
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150 Report.Failed ("Exception not propagated from protected " &
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151 " operation in Allocate_Resources");
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152 exception
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153 when Semaphore.Resource_Underflow => -- Exception prop.
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154 Semaphore.Handled_In_Procedure_Caller := True; -- from protected
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155 -- procedure.
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156 when others =>
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157 Report.Failed ("Unknown exception during resource allocation");
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158 end Allocate_Resources;
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159
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160
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161 Deallocate_Resources:
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162 declare
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163 Loop_Count : Integer := Total_Resources_Available + 1;
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164 begin -- Force exception.
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165 for I in 1..Loop_Count loop
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166 Resources.Release;
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167 end loop;
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168 Report.Failed ("Exception not propagated from protected " &
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169 "operation in Deallocate_Resources");
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170 exception
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171 when Semaphore.Resource_Overflow => -- Exception prop
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172 Semaphore.Handled_In_Function_Caller := True; -- from protected
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173 -- function.
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174 when others =>
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175 Report.Failed ("Exception raised during resource deallocation");
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176 end Deallocate_Resources;
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177
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178
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179 if not (Semaphore.Handled_In_Procedure_Caller and -- Incorrect exception
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180 Semaphore.Handled_In_Function_Caller) -- handling in
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181 then -- protected ops.
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182 Report.Failed
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183 ("Improper exception propagation by protected operations");
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184 end if;
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185
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186 exception
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187
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188 when others =>
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189 Report.Failed ("Unexpected exception " &
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190 " raised and propagated in test");
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191 end Test_Block;
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192
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193
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194 Report.Result;
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195
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196 end CB20007;
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