●●● ●●●● 2.1 Operating System Services :: ● ●●●● · Operating-system provide another set of° common services that are helpful to ensuring the efficient operation of the system itself Resource allocation o When multiple users or multiple jobs running concurrently o Resources must be allocated to each of them Some may have special allocation code such as CPU cycles(process-scheduling), main memory, and file storage others may have general request and release code such as l/o devices8 2.1 Operating System Services ⚫ Operating-system provide another set of common services （that are helpful to ensuring the efficient operation of the system itself ） ⚫ Resource allocation ⚫ When multiple users or multiple jobs running concurrently ⚫ Resources must be allocated to each of them ▪ Some may have special allocation code ▪ such as CPU cycles (process-scheduling), main memory, and file storage ▪ others may have general request and release code ▪ such as I/O devices