A system for controlling a multitasking microprocessor system includes an interconnect, a plurality of processing units connected to the interconnect forming a single-source, single-sink flow network, wherein the plurality of processing units pass data between one another from the single-source to the single-sink, and a monitor connected to the interconnect for monitoring a portion of a resource consumed by each of the plurality of processing units and for controlling the plurality of processing units according to a predetermined budget for the resource to control a data overflow condition, wherein the monitor controls performance and power modes of the plurality of processing units.