The current version of symbian is not a real time OS. I think they are working on a RT symbian in the symbian community right now.
For a OS to be RT it should have the two c/cs:
1. The kernel is re-entrant & pre-emptable (necessary but not sufficient).
2. The response to events should be predictable.
It's can yes. and no. At the first i think it more called firmware than RTOS. Futherly it can say RTOS because from version 5.0 it can do a multitasking process. and have thread.
am sure symbian is a mutitasking, realtime to a certain extent..or is it? current version is ver 8 , on n91,n90 and n70 phones..any other OS thaat can replace symbian?
what is the benefite of symbian OS against other RTOS like as threadx ,vxworks,RTLinux,...?Is there any additional feature in it?or it is only anoyher RTOS that is used in nokia phones?
BTW:
This is a table in page 787 of Symbian OS internals.