Types of Schedulers Introduction This chart shows the function of each of the three types of schedulers (long-term, short-term, and medium-term) for each of three types of operating systems (batch, interactive, and real-time). Chart batch interactive real-time long-term job admission based on charfacteristics and resource needs sessions and processes normally accepted unless capacity reached processes either perma- nent or accepted at once medium- term usually none-jobs remain in storage until done processes swapped when necessary processes never swapped short-term processes scheduled by priority; continue until wait voluntarily, request service, or are termi- nated processes scheduled on rotating basdis; con- tinue until service requested, time quan- tum expires, or pre- empted scheduling based on strict priority with immediate pre-emption; may time-share pro- cesses with equal priori- ties