Paint operating system call
The interactive system user interaction request is made using a multi-level feedback queue round-robin High Priority
Concurrent execution of different characteristics and executed sequentially: 1. concurrent program having a relation of mutual restraint during program execution and calculation not correspond 2. 3. 4. concurrent program results can not be changed during concurrent execution lost closed
Entry address of the interrupt handler in the interrupt vector table
Dynamic request to release system resources system calls
The system open file operation classes allow a scramble in the process from a run - time slice> Ready possible events for the process of running out
User mode to kernel mode only way to access the instruction pipe to user mode kernel mode by modifying the program status word PSW through
Exception: Procedural Interrupt instruction abort access tube: Clock Interrupt I / O interrupt interrupts the console hardware failures
Designed interactive system scheduling algorithm: a more balanced response time faster performance
Programs related to interrupt the program currently running
The processor comprises two registers: one for the user-visible register of the second type of control and status registers
Cause of the interruption event is the interrupt source
Processor to pause the current program turn into the interrupt handler interrupt response
Pause point is out of the running program interrupt break
The system is divided into three types of environments: batch environment interactive environment real-time environment
Procedure call system returns to the calling program before the call is completed to run the scheduler then returns to the calling program
PCB process control block are: process name process ID information stored in the priority list of the current state of the resource family relation message queue process queue is currently open file
Batch scheduling algorithms: FCFS Shortest job first response priority than the highest bidder
Advanced feedback queue round-robin scheduling algorithm belonging to the time-sharing system
Processor Management: 1. Control 2. Process 3. Process synchronization between 4 interprocess communication, scheduling
Interrupt is triggered by an external event. The exception is triggered by the execution of a normal instruction