* The OS can only block a running task and let another task gain access of CPU to run the

servicing codes

Tasks in Embedded Program

TCB task 1 TCB task 2

Tasks are embedded program computational unit that runs on a CPU under the state-
control using a task control block and are processed concurrently

Task States
(i) Idle state [Not attached or not registered]
(ii) Ready State [Attached or registered]
(111) Running state

(iv) Blocked (waiting) state

(v) Delayed for a preset period

Signal or message
Wait for Signal or **
message
= blocked
detached with kernel