Threads are contained in a partition. Thus, these components are contained
      in a process component (which models a partition). 
There is the supported properties for threads declaration:
      
- Source_Stack_Size: the stack size of the thread
- Period: the actual period of the thread (execution rate)
- Deadline: the actual deadline of the thread (when the job
            should finish)
- Compute_Exeution_Time: the execution time needed to execute
            the application code of the threads.
      
Copyright 2009 POK Team