1. A processing system comprising a plurality of processing elements, the processing elements comprising a controller and computation means, the plurality of processing elements being dynamically reconfigurable by a cluster control signal as mutually independently operating task units that comprise one processing element or a cluster of two or more processing elements, the processing elements within a cluster being arranged to execute instructions under a common thread of program control, wherein the cluster control signal is derived from intermediate control signals transmitted through a reconfigurable channel infrastructure connected to the processing elements, wherein the reconfigurable channel infrastructure comprises a control chain with combination elements for each processing element and a programmable switch between each pair of neighboring processing elements for locally controllably inhibiting transmission of intermediate control signals to a preceding or a succeeding processing element.