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(1)
I have managed to debug an ADA program that had no tasks with gdb.
However, when I tried a program that contain tasks, gdb says that a SIGUSR1
was received whenever I am trying to run the program.
Is this expected ? What should I do in order to continue the debugging session
?
(After I debugged it with intermediate printing of key variables it seems to
operate as expected when run from the command line. Still, I want to run it in
gdb in order to learn how to debug it with a real debugger.)
(2)
Although the program seems all right, my tasks seems to run in a sequential
order, and not concurrently. Is this expected ? How to fix it ?
I have written a program (ADA code) to demonstrate the sequential nature (as
opposed to parallel) of the tasks:
-- This program attempts to run 2 tasks "concurenntly".
-- Each task prints some uniqe character, (A and B) on the
-- screen, to demonstrate its progress (actually, these
-- tasks do nothing useful besides printing their mark
-- on the screen).
-- If the tasks are actualy run concurrently then these
-- marks should be interleaved.
with Text_Io; use Text_Io;
procedure demo is
-- The first task. Will print the "A" character to
-- demonstrate its progress.
task print_A is
entry run;
end print_A;
task body print_A is
begin
select
accept run do
for count in 1..60 loop
delay 1.0;
put(" -A- ");
end loop;
end run;
or
terminate;
end select;
end print_A;
-- The second task. Will print the "B" character to
-- demonstrate its progress. Otherwise, it is
-- identical to the first.
task print_B is
entry run;
end print_B;
task body print_B is
begin
select
accept run do
for count in 1..60 loop
delay 1.0;
put(" *B* ");
end loop;
end run;
or
terminate;
end select;
end print_B;
begin
print_A.run;
print_B.run;
New_Line;
end demo;
