gcc/testsuite/ada/acats/tests/c9/c974014.a

   1 -- C974014.A
   2 --
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  18 --     ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
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  24 --*
  25 --
  26 -- OBJECTIVE:
  27 --      Check that if the triggering alternative of an asynchronous select
  28 --      statement is a delay and the abortable part completes before the delay
  29 --      expires then the delay is cancelled and the optional statements in the
  30 --      triggering part are not performed.  In particular, check the case of
  31 --      the ATC in non-tasking code.
  32 --
  33 -- TEST DESCRIPTION:
  34 --      A fraction of in-line code is simulated.  An asynchronous select
  35 --      is used with a triggering delay of several minutes.  The abortable
  36 --      part, which is simulating a very lengthy, time consuming procedure
  37 --      actually returns almost immediately thus ensuring that it completes
  38 --      first.  At the conclusion, if a substantial amount of time has passed
  39 --      the delay is assumed not to have been cancelled.
  40 --      (based on example in LRM 9.7.4)
  41 --
  42 --
  43 -- CHANGE HISTORY:
  44 --      06 Dec 94   SAIC    ACVC 2.0
  45 --
  46 --!
  47
  48
  49 with Report;
  50 with Ada.Calendar;
  51
  52 procedure C974014 is
  53
  54    function "-" (Left, Right : Ada.Calendar.Time)
  55                               return Duration      renames Ada.Calendar."-";
  56
  57    TC_Start_Time      : Ada.Calendar.Time := Ada.Calendar.Clock;
  58    TC_Elapsed_Time    : duration;
  59
  60    Maximum_Allowable_Time : duration := 300.0; -- for Calculate_Gamma_Function
  61
  62 begin
  63
  64    Report.Test ("C974014", "ATC: When abortable part completes before " &
  65                              "a triggering delay, check that the delay " &
  66                              "is cancelled & optional statements " &
  67                              "are not performed");
  68
  69    declare  -- encapsulate test code
  70
  71       type Gamma_Index is digits 5;   -- float precision
  72
  73       -- (These two fields are assumed filled elsewhere)
  74       Input_Field, Result_of_Beta : Gamma_Index;
  75
  76       -- Notify and take corrective action in the event that
  77       -- the procedure Calculate_Gamma_Function does not converge.
  78       --
  79       procedure Non_Convergent is
  80       begin
  81          null;  -- stub
  82
  83          Report.Failed ("Optional statements in triggering part" &
  84                                     " were performed");
  85       end Non_Convergent;
  86
  87
  88       --  This is a very time consuming calculation.  It is possible,
  89       --  that, with certain parameters, it will not converge.  If it
  90       --  runs for more than Maximum_Allowable_Time it is considered
  91       --  not to be convergent and should be aborted.
  92       --
  93       Procedure Calculate_Gamma_Function (X, Y : Gamma_Index) is
  94       begin
  95          null;  -- Stub
  96          --
  97       end Calculate_Gamma_Function;
  98
  99    begin  -- declare
 100
 101       -- .....  Isolated segment of inline code
 102
 103       -- Now Print Gamma Function (abort and display if not convergent)
 104       --
 105       select
 106          delay Maximum_Allowable_Time;  -- for Calculate_Gamma_Function
 107          Non_Convergent;   -- Display error and flag result as failed
 108
 109       then abort
 110          Calculate_Gamma_Function (Input_Field, Result_of_Beta);
 111       end select;
 112
 113       -- .....  End of Isolated segment of inline code
 114
 115    end; -- declare
 116
 117    TC_Elapsed_Time := Ada.Calendar.Clock - TC_Start_Time;
 118
 119    -- Note: We are not checking for "cancellation within a reasonable time",
 120    -- we are checking for cancellation/non-cancellation of the delay.  We
 121    -- use a number which, if exceeded, means that the delay was not
 122    -- cancelled and has proceeded to  full term.
 123    --
 124    if ( TC_Elapsed_Time > Maximum_Allowable_Time/2 ) then
 125       -- Test time exceeds a reasonable value.
 126       Report.Failed ("Triggering delay statement was not cancelled");
 127    end if;
 128
 129
 130    Report.Result;
 131
 132 end C974014;