OPERATING SYSTEM - UNIT 5.pptx Program threats- System threats – Securing system and facilities. OPERATING SYSTEM-UNIT 4.pptxefficiency and performance –Recovery. OPERATING SYSTEM-UNIT 3.pptxMemory management for UNIX, Solaris, Linux, Windows, Android. OPERATING SYSTEM -UNIT 2.pptdeadlock detection – recovery from deadlock. OPERATING SYSTEM-UNIT 1.pptxSystem Calls 
