Issue with a Procedure

Question

declare
-- Local variables here
i integer;
begin
-- new_pack.set_value(false);
new_pack.get_value;
end;
In the above code, The procedure returns the last passed set value  even when i comment the setvalue procedure and retrieve the value from get
_value.
But if i execute it in a new session, It gives me the default value , i have set.
Why is it so? and What should be done to retrieve the default value in all the sessions?
Below is the created package.
create or replace package body New_pack is
procedure get_value is
begin
if cond then
dbms_output.put_line('Value is true');
else
dbms_output.put_line('Value is false');
end if;
end;
procedure set_value(dat boolean ) is
begin
cond := dat;
end;
end New_pack;

Answer 1

PL/SQL is a very poor place to do things "globally" across sessions. To do this properly one needs to use shared memory of sorts, semaphores and mutexes to manage read/write access to the global data, etc.
Why do all this when you can use what Oracle uses for this.. SQL tables. It supports concurrent access. It supports row-level locking. It has ACID properties. Etc.
Do not reinvent the SQL wheel in PL/SQL.