1. Assume that an operating system is written for a machine architecture that has the following attributes: (a) a single processor, with some fixed number M of CPU registers (b) base-limit register addressing (c) a fixed set of N peripheral devices at known bus addresses Assume furthermore that: _ The process scheduler uses information about how much processor time a process has had and how long it has been in existence to decide which process to run next. _ The operating system keeps track of which processes have created which other processes. _ Processes can signal each other as a means of synchronizing their respective behaviors. Signals are small integer values. _ Processes can share their executable code. Write a pseudo-code description of a PCB that could be used by such an operating system. What members must be part of the PCB? What are their data types?