3. 1.2 Processes and PcBs(1/4) .a program in execution An instance of a program running on a computer The entity that can be assigned to and executed on a processor A unit of activity characterized by he execution of a sequence of instructions · a current state an associated set of system resources3.1.2 Processes and PCBs(1/4) • A program in execution • An instance of a program running on a computer • The entity that can be assigned to and executed on a processor • A unit of activity characterized by： • the execution of a sequence of instructions • a current state • an associated set of system resources • ...... *