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thechaingamer
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ada-git-code

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function Unreliable_Slow_Add (x : Integer) return Integer is
Error_Rate : Constant := 0.125; -- (between 0 and 1)
Random_Num : Float := 0.0;
begin
Random_Num := Random(Gen);
delay Duration(Random_Num * 4.0);
if Random_Num > Error_Rate then
return x + 10;
else
raise Count_Failed;
end if;
end Unreliable_Slow_Add;
task type Transaction_Worker (Initial : Integer; Manager : access Transaction_Manager);
task body Transaction_Worker is
Num : Integer := Initial;
Prev : Integer := Num;
Round_Num : Integer := 0;
begin
Put_Line ("Worker" & Integer'Image(Initial) & " started");
loop
Put_Line ("Worker" & Integer'Image(Initial) & " started round" & Integer'Image(Round_Num));
Round_Num := Round_Num + 1;
-- PART 1 --
select
Manager.Wait_Until_Aborted;
Num := Prev + 5;
Put_Line( "Forward error recovery: Worker"
& Integer'Image( Initial ) & " commiting" & Integer'Image( Num ) );
then abort
begin
Num := Unreliable_Slow_Add( Num );
Manager.Finished;
Put_Line (" Worker" & Integer'Image(Initial) & " comitting" & Integer'Image(Num));
exception
when Count_Failed =>
begin
Put_Line( " Worker" & Integer'Image( Initial ) & " aborting" );
Manager.Signal_Abort;
Manager.Finished;
Function Definition: procedure exercise7 is
Function Body: Count_Failed : exception; -- Exception to be raised when counting fails
Gen : Generator; -- Random number generator
protected type Transaction_Manager (N : Positive) is
entry Finished;
function Commit return Boolean;
procedure Signal_Abort;
private
Finished_Gate_Open : Boolean := False;
Aborted : Boolean := False;
Should_Commit : Boolean := True;
end Transaction_Manager;
protected body Transaction_Manager is
entry Finished when Finished_Gate_Open or Finished'Count = N is
begin
------------------------------------------
-- PART 3: Complete the exit protocol here
------------------------------------------
if Finished'Count = N - 1 then
Finished_Gate_Open := True;
Should_Commit := True;
end if;
if Aborted then
Should_Commit := False;
end if;
if Finished'Count = 0 then
Finished_Gate_Open := False;
Aborted := False;
end if;
end Finished;
procedure Signal_Abort is
begin
Aborted := True;
end Signal_Abort;
function Commit return Boolean is
begin
return Should_Commit;
end Commit;
end Transaction_Manager;
function Unreliable_Slow_Add (x : Integer) return Integer is
Error_Rate : Constant := 0.15; -- (between 0 and 1)
begin
-------------------------------------------
-- PART 1: Create the transaction work here
-------------------------------------------
Random_Num := Random(Gen);
delay Duration(Random_Num * 4.0);