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111
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1 -- C97201A.ADA
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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 -- CHECK THAT A RENDEZVOUS REQUESTED BY A CONDITIONAL_ENTRY_CALL
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26 -- IS PERFORMED ONLY IF IMMEDIATELY POSSIBLE.
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27
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28 -- CASE A: THE TASK TO BE CALLED IS NOT YET ACTIVE AS OF THE
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29 -- MOMENT OF CALL (CONDITIONAL_ENTRY_CALL),
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30 -- AND THIS FACT CAN BE DETERMINED STATICALLY.
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31
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32
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33 -- RM 4/20/82
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34
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35
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36 WITH REPORT; USE REPORT;
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37 PROCEDURE C97201A IS
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38
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39 ELSE_BRANCH_TAKEN : INTEGER := 3 ;
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40
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41 BEGIN
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42
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43
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44 TEST ("C97201A", "CHECK THAT NO RENDEZVOUS REQUESTED BY" &
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45 " A CONDITIONAL_ENTRY_CALL CAN OCCUR WHILE" &
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46 " THE CALLED TASK IS NOT YET ACTIVE" );
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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
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52 DECLARE
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53
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54
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55 TASK T IS
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56 ENTRY DO_IT_NOW_ORELSE ( AUTHORIZED : IN BOOLEAN ) ;
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57 END T ;
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58
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59
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60 TASK BODY T IS
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61
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62 PACKAGE SECOND_ATTEMPT IS END SECOND_ATTEMPT ;
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63 PACKAGE BODY SECOND_ATTEMPT IS
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64 BEGIN
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65
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66 SELECT
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67 DO_IT_NOW_ORELSE (FALSE) ;--CALLING (OWN) ENTRY
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68 ELSE -- (I.E. CALLER ADOPTS A NO-WAIT POLICY)
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69 -- THEREFORE THIS BRANCH MUST BE CHOSEN
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70 ELSE_BRANCH_TAKEN := 2 * ELSE_BRANCH_TAKEN ;
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71 COMMENT( "ELSE_BRANCH TAKEN (#2)" );
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72 END SELECT;
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73
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74 END SECOND_ATTEMPT ;
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75
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76 BEGIN
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77
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78 ACCEPT DO_IT_NOW_ORELSE ( AUTHORIZED : IN BOOLEAN ) DO
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79
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80 IF AUTHORIZED THEN
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81 COMMENT( "AUTHORIZED ENTRY_CALL" );
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82 ELSE
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83 FAILED( "UNAUTHORIZED ENTRY_CALL" );
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84 END IF;
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85
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86 END DO_IT_NOW_ORELSE ;
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87
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88
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89 END T ;
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90
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91
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92 PACKAGE FIRST_ATTEMPT IS END FIRST_ATTEMPT ;
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93 PACKAGE BODY FIRST_ATTEMPT IS
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94 BEGIN
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95 SELECT
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96 T.DO_IT_NOW_ORELSE (FALSE) ;
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97 ELSE -- (I.E. CALLER ADOPTS A NO-WAIT POLICY)
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98 -- THEREFORE THIS BRANCH MUST BE CHOSEN
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99 ELSE_BRANCH_TAKEN := 1 + ELSE_BRANCH_TAKEN ;
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100 COMMENT( "ELSE_BRANCH TAKEN (#1)" );
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101 END SELECT;
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102
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103 END FIRST_ATTEMPT ;
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104
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105
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106 BEGIN
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107
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108 T.DO_IT_NOW_ORELSE ( TRUE ); -- TO SATISFY THE SERVER'S
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109 -- WAIT FOR SUCH A CALL
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110
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111 EXCEPTION
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112
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113 WHEN TASKING_ERROR =>
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114 FAILED( "TASKING ERROR" );
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115
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116 END ;
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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
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122 -- BY NOW, THE TASK IS TERMINATED (AND THE NONLOCALS UPDATED)
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123
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124
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125 CASE ELSE_BRANCH_TAKEN IS
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126
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127 WHEN 3 =>
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128 FAILED( "NO 'ELSE'; BOTH (?) RENDEZVOUS ATTEMPTED?" );
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129
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130 WHEN 4 =>
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131 FAILED( "'ELSE' #1 ONLY; RENDEZVOUS (#2) ATTEMPTED?" );
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132
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133 WHEN 6 =>
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134 FAILED( "'ELSE' #2 ONLY; RENDEZVOUS (#1) ATTEMPTED?" );
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135
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136 WHEN 7 =>
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137 FAILED( "WRONG ORDER FOR 'ELSE': #2,#1 " );
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138
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139 WHEN 8 =>
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140 NULL ;
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141
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142 WHEN OTHERS =>
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143 FAILED( "WRONG CASE_VALUE" );
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144
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145 END CASE;
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146
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147
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148 RESULT;
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149
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150
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151 END C97201A ;
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