© Thomas Kunz 2000
SCE 574
9
Classes of Software Systems (cont.)
äReal-time
and embedded systems
äReceives
data from the environment
äReturns
results sufficiently quickly to affect the environment
äProcess
control systems (manufacturing, refining), Automated Teller Networks
(ATM), Telephone switching systems, Hospital patient monitoring
systems, operating systems
äDistinction from on-line systems is usually because of
performance requirements or because responses depend on the system’s state
äThese
systems are typically harder to build than transaction processing systems, they
require more analysis and design work
äHard real-time => if a performance deadline is missed, the
result can cause human injury or major financial damage