Tasks reinitializing

[Pablo <pablittto@gmail.com>]

How can I reinitialize a task?
Say us, I have two cases:
A task defined as
   task type Task_type is
      entry Start;
   end Task_type;
so the object defined as
Init : Init_type;

and inside a procedure, the task is initialized with
accept Start;

and now:
1) In run time, the task is terminated by aborting process (abort
Init) before its end, and in the same session, I need to turn it on
again, but now from the beginning.
2) In run time, the task is finished by very end, and in the same
session, I need to start it again from beginning.

Please help me!