Operating System Concepts
System Calls
the system-call interface intercepts function calls in the API and invokes the necessary system call within the operating system.
Interprocess communication
two common model:
message-passing:smaller amounts of data, no conficts to be avoided
shared-memory:need protection and synchronization
OS designseparation of mechanisms and policies is important for flexibility
Mechanisms: how to do
Policies:what to do
性能瓶颈很可能是内存管理和CPU管理
critical routines:memory manager and CPU scheduler
OS structure
layered approach
microkernels
modules
System Generation
configure system for specific computer site.
sysgen program will collect all needed informations.
