임베디드 시스템에 대한 일반적인 내용과 RTOS인 VxWorks 위주로
System call들 위주로 설명하고 있다.
o To manage system resource through
system calls -- issued by tasks
interrupts -- timer and external events
o Typical requirements
Support for scheduling of real-time tasks and interrupt handlers
Inter-process communication
I/O support -- driver
User control of system resource -- memory and file system
o Thread or process for task execution:
smallest execution units that can be scheduled
lives in a virtual, insulated environment
uses or owns system resources
invalid-file
