Long description

The figure consists of a block divided horizontally into seven layers and numbered from bottom to top as 1 to 7. The layers are given as follows. layer 1: Hide the low-level hardware. layer 2: Interrupt handling, context switching, M M U. layer 3: Threads, thread scheduling, thread synchronization. layer 4: It is divided into n number of parts labeled Driver 1, driver 2, up to driver n. layer 5: Virtual memory. layer 6: It is divided into m number of parts labeled file system 1, up to file system m. layer 7: System call handler.