One, fill in the blanks
1. The operating system provides users with three types of user interfaces, which are command mode and system call and graphical user interface.
2. The data transfer control methods between the main memory and peripheral devices (I/O control method) include direct program control, interrupt drive mode, DMA mode and channel control mode.
3. In the job scheduling algorithm with the highest response priority, when the waiting time of each job is the same, the job with the short running time will be scheduled first; when the job requires the same running time, the job with the long waiting time will be scheduled first .
4. When a process monopolizes the processor's sequential execution, it has two characteristics: closedness and reproducibility.
5. After the program is compiled or assembled, the target program is formed. The order of instructions is based on zero as the reference address. These addresses are called logical addresses (relative addresses).
6. The process consists of programs, data and PCB.
7. The operation on the semaphore S can only be carried out through primitive (P, V operation) operations, and a waiting queue is set up for each semaphore.
8. The operating system is the most basic system software that runs on a computer bare metal system.
9. Virtual device refers to the use of SPOOLING technology to improve an exclusive device into a shared device for multiple users.