(1)
Following are the ways in which processor can switch from user mode to kernel mode:
(2)
Process:
Thread:
Example:
Suppose there is a process in which it has to read 100 files. Since file reading is not involving any CPU, if there is only single thread of control it reads files one by one. So it is better to create 100 threads for a process so that read of 100 files can happen parallelly since file reading is I/0.
(3)
Preemptive Scheduling:
Non-Preemptive Scheduling:
Operating Systems 1. Name three ways in which the processor can transition from user mode to...
What can be the causes for the processor to transmission from user mode to kernel mode? Can the user execute arbitrary code after transitioning?
The VAX/ VMS operating system makes use of four processor access modes to facili-tate the protection and sharing of system resources among processes. The access mode determines:• Instruction execution privileges: What instructions the processor may execute• Memory access privileges: Which locations in virtual memory the current instruc-tion may access The four modes are as follows:• Kernel: Executes the kernel of the VMS operating system, which includes memo-ry management, interrupt handling, and I/ O operations• Executive: Executes many of the operating...
The VAX/ VMS operating system makes use of four processor access modes to facili-tate the protection and sharing of system resources among processes. The accessmode determines:• Instruction execution privileges: What instructions the processor may execute• Memory access privileges: Which locations in virtual memory the current instruc-tion may accessThe four modes are as follows:• Kernel: Executes the kernel of the VMS operating system, which includes memo-ry management, interrupt handling, and I/ O operations• Executive: Executes many of the operating system service...
Operating Systems: 1. Given the three thread states: running, runnable (i.e., ready), and blocked (i.e., waiting), state which of the six possible thread transitions are allowed, and which ones are not. Also, for each case, provide an example of how the transition occurs, or a reason why it cannot (as a justification for each of your answers). Assume Mesa-style scheduling.
There are 3 strategies to map user to kernel threads. Briefly describe each. Which one is used in most modern operating systems? Describe how an operating system can be viewed differently depending on the use case (e.g., administrators, users, developers, system engineers). There are 5 general areas of management that an operating system is responsible for. Name and briely describe 3 of them.
TRUE-FALSE Basic synchronization principles and multithreading 1. Java user threads can implement both busy-waiting and no-busy-waiting policy. 2. Priority inversion avoids deadlocks. 3. Spinlock mutex can be used as an adaptive mutex. 4. Java RTE can be blocked for Input/Output operation. 5. Interrupted user thread, which executes a method in a monitor, must be rolled back to undo any changes it performed. 6. The synchronization primitive by disabling interrupts can be used by an application program. 7. Bounded-waiting requirement is...
6. Name and discuss the three ways by which genetic recombination can occur in bacteria. Explain how they reproduce. Can bacteria of different genera exchange genetic material?
There are many different ways that a company can approach the systems development process; (1) purchase software from a vendor, (2) design the system in-house, or (3) outsource to develop and manage the information system, should the accountants or IT personnel determine how well does the system meets How well it meets user needs and whether it is economically feasible?
Briefly describe how the three helminthes morphology differs from one another: Name 2 ways in which that humans get infected by parasites: How are parasitic infections diagnosed in humans? Blood test/fecal examination?
Operating Siytem Concepts Homework No. 1 Variant No. 1 Student Cristian Anchei Paraschine (academic group, name, surname) I got the task.... (date, signature) Homework Submission Date: November 6th, 2019 Assignment: Consider the following set of processes, with the length of the CPU burst time given in milliseconds!: Process CPU burst time, ms Arrival time, ms Priority P 2 2 2 7 Ps 3 3 Draw a Gantt chart that illustrates process scheduling for these algorithms: a) First Come - First...