Seems to work fine.

  GNAT 3.09 (GCC 2.7.2) for Win32
  (Windows 95 in a DOS window)
  no source modifications
  compiled using GNATMAKE with no switches.

Is this output what you expect?

---------------------------------------------------------------------
Todd Coniam, Master Sergeant, U.S. Air Force | Member:  Team Ada
[log in to unmask]             | Ada 95 - The World
Any opinions expressed are personal, and not | Standard In Modern OO
those of the U.S.A.F. or U.S. government.    | Programming Languages.
---------------------------------------------------------------------

F:\tasktest>task_array2
in main
RENDEVOUS:  1
RENDEVOUS:  2
RENDEVOUS:  3
The_Task_Number:  1  I:  75000
RENDEVOUS:  4The_Task_Number:  3  I:  75000
The_Task_Number:  1  I:  150000The_Task_Number:  2  I:  75000

back in main
The_Task_Number:  2  I:  150000
The_Task_Number:  3  I:  150000
The_Task_Number:  4  I:  75000
The_Task_Number:  1  I:  225000
The_Task_Number:  3  I:  225000
The_Task_Number:  2  I:  225000
The_Task_Number:  4  I:  150000

The_Task_Number:  3  I:  300000
The_Task_Number:  1  I:  300000
The_Task_Number:  2  I:  300000The_Task_Number:  4  I:  225000
The_Task_Number:  3  I:  375000
The_Task_Number:  1  I:  375000

The_Task_Number:  4  I:  300000
The_Task_Number:  3  I:  450000The_Task_Number:  1  I:  450000
The_Task_Number:  4  I:  375000The_Task_Number:  2  I:  375000


The_Task_Number:  1  I:  525000
The_Task_Number:  2  I:  450000The_Task_Number:  4  I:  450000
The_Task_Number:  3  I:  525000
The_Task_Number:  1  I:  600000
The_Task_Number:  4  I:  525000

The_Task_Number:  3  I:  600000
The_Task_Number:  2  I:  525000The_Task_Number:  4  I:  600000
The_Task_Number:  1  I:  675000
The_Task_Number:  3  I:  675000

The_Task_Number:  4  I:  675000
The_Task_Number:  1  I:  750000
The_Task_Number:  3  I:  750000The_Task_Number:  4  I:  750000

The_Task_Number:  2  I:  600000
The_Task_Number:  2  I:  675000
The_Task_Number:  2  I:  750000

F:\tasktest>


>----------
>From:  Paul Bence[SMTP:[log in to unmask]]
>Sent:  Tuesday, March 18, 1997 12:24
>To:    [log in to unmask]
>Subject:       task arrays
>
>We are evaluating GNAT for possible use at Naval Fleet Numerical
>supercomputing
>center. Any assistance in clarifying what is going on in the simple
>code below
>would be greatly appreciated.
>
>Using GNAT 3.07: core dump or hang
>Using GNAT 3.01: Tasks 3,4 finish, tasks 1 and 2 do not. No errors
>reported.
>
>We routinely use data structures much larger that this, and have
>launched many
>more tasks at once (the example uses 4 tasks). We are using Solaris 2.5
>
>Regards,
>
>Paul Bence/Anteon Corp., potential_customer.multi_tasking_novice
>---------------------------------------------------------------------
>with Text_IO;
>
>procedure Task_Array2 is
>
>   Natural_Array_Limit : constant NATURAL := 750_000;
>   Loop_Step           : constant NATURAL := Natural_Array_Limit / 10;
>   Task_Array_Limit    : constant NATURAL := 4;
>
>   type Big_Array_T is array (1..Natural_Array_Limit) of NATURAL;
>   type Matrix_T is array (1..Task_Array_Limit) of Big_Array_T;
>
>   Matrix : Matrix_T;
>
>   task type Array_Initializer is
>
>      entry Initialize;
>      entry Receive_Msg (Task_Number : in POSITIVE);
>
>   end Array_Initializer;
>
>   type Task_Array_T is array (1..Task_Array_Limit) of
>Array_Initializer;
>
>   Task_Array : Task_Array_T;
>   -------------------------------------------------------------------
>   task body Array_Initializer is
>
>      The_Task_Number : POSITIVE;
>
>   begin
>      accept Initialize;
>
>      select
>         accept Receive_Msg (Task_Number : in POSITIVE) do
>            Text_IO.Put_Line ("RENDEVOUS: " & INTEGER'IMAGE
>(Task_Number));
>            The_Task_Number := Task_Number;
>         end Receive_Msg;
>
>         for I in Big_Array_T'RANGE loop
>            Matrix (The_Task_Number)(I) := 0;
>            if (I mod Loop_Step) = 0 then
>               Text_IO.Put_Line (
>                 "The_Task_Number: " &  INTEGER'IMAGE (The_Task_Number)
>                  & "  I: " & INTEGER'IMAGE (I));
>            end if;
>         end loop;
>
>  --    or Terminate;
>      end select;
>
>   end Array_Initializer;
>   -------------------------------------------------------------------
>begin
>   Text_Io.Put_Line ("in main");
>   for I in Task_Array'RANGE loop
>      Task_Array (I).Initialize;
>      Task_Array (I).Receive_Msg (Task_Number => I);
>   end loop;
>   Text_Io.Put_Line ("back in main");
>end Task_Array2;
>
>
>