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5.2.1 Task Definition
Many definitions of a task have been proposed in computer literature. Unfortunately, none
of these definitions encompasses all facets of the concept in a manner which is operating
system independent. Several of the more common definitions are provided to enable each
user to select a definition which best matches their own experience and understanding of
the task concept:

a "dispatchable" unit.
an entity to which the processor is allocated.
an atomic unit of a real-time, multiprocessor system.
single threads of execution which concurrently compete for resources.
a sequence of closely related computations which can execute concurrently with
other computational sequences.
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From RTEMS’ perspective, a task is the smallest thread of execution which can compete on
its own for system resources. A task is manifested by the existence of a task control block
(TCB).