OS-process-lee
... Example of System State: Intel Core Duo Note the registers that are required to record the “state” of the executing process State is swapped on a ...
... Example of System State: Intel Core Duo Note the registers that are required to record the “state” of the executing process State is swapped on a ...
Linux+ Guide to Linux Certification
... • Major device number: Used as index to array to access appropriate code for specific device driver • Minor device number: Passed to device driver as argument and is used to access one of several identical physical devices • Block I/O system: Used for devices that can be addressed as sequence of 512 ...
... • Major device number: Used as index to array to access appropriate code for specific device driver • Minor device number: Passed to device driver as argument and is used to access one of several identical physical devices • Block I/O system: Used for devices that can be addressed as sequence of 512 ...
COS 318: Operating Systems Processes and Threads Kai Li Computer Science Department
... How to run without touching any registers? • CISC machines have a special instruction to save and restore all registers on stack • RISC: reserve registers for kernel or have way to carefully save one and then continue ...
... How to run without touching any registers? • CISC machines have a special instruction to save and restore all registers on stack • RISC: reserve registers for kernel or have way to carefully save one and then continue ...
Processes
... – Iterative server: the server itself handles the request and, if necessary, returns a response to the requesting client. – Concurrent server: it does not handle the request itself, but passes it to a separate thread or another process, after which it immediately waits for the next incoming request. ...
... – Iterative server: the server itself handles the request and, if necessary, returns a response to the requesting client. – Concurrent server: it does not handle the request itself, but passes it to a separate thread or another process, after which it immediately waits for the next incoming request. ...
Unit 10 Final Project Kaplan University Unit 10 Project Julee
... Processes can run at the same time and share the same resources, but the sharing of resources can lead to an undesirable state that will be more thoroughly mentioned later. Threads are similar to processes in that they both execute a unit of work, but instead of using a control block like a process; ...
... Processes can run at the same time and share the same resources, but the sharing of resources can lead to an undesirable state that will be more thoroughly mentioned later. Threads are similar to processes in that they both execute a unit of work, but instead of using a control block like a process; ...
Discussion #05
... scheduling priority of the process. In some systems, several values are required (e.g., default, current, highest-allowable) •Scheduling-related information: This will depend on the scheduling algorithm used. Examples are the amount of time that the process has been waiting and the amount of time th ...
... scheduling priority of the process. In some systems, several values are required (e.g., default, current, highest-allowable) •Scheduling-related information: This will depend on the scheduling algorithm used. Examples are the amount of time that the process has been waiting and the amount of time th ...
Introduction to Operating Systems
... Supervisor/Operator Control Secure monitor that controls job processing Special cards indicate what to do. User program prevented from performing I/O ...
... Supervisor/Operator Control Secure monitor that controls job processing Special cards indicate what to do. User program prevented from performing I/O ...
Signals and Threads
... It is raised by one process (or hardware) to call another process’s attention to an event ...
... It is raised by one process (or hardware) to call another process’s attention to an event ...
Operating Systems I: Chapter 3
... – Program execution – system capability to load a program into memory and to run it. – I/O operations – since user programs cannot execute I/O operations directly, the operating system ust provide some means to perform I/O. – File-system manipulation – program capability to read, write, create, and ...
... – Program execution – system capability to load a program into memory and to run it. – I/O operations – since user programs cannot execute I/O operations directly, the operating system ust provide some means to perform I/O. – File-system manipulation – program capability to read, write, create, and ...
CUSTOMER_CODE SMUDE DIVISION_CODE SMUDE
... controls the slaves. This arrangement allows parallelism in an application by allocating to it many slaves. (2 marks) Symmetric: All processors are functionally identical. They form a pool of resources. Other resources such as memory and I/O devices are available to all processors. If they are avail ...
... controls the slaves. This arrangement allows parallelism in an application by allocating to it many slaves. (2 marks) Symmetric: All processors are functionally identical. They form a pool of resources. Other resources such as memory and I/O devices are available to all processors. If they are avail ...
process control block
... Process state. The state may be new, ready running, waiting, halted, and so on. Program counter. The counter indicates the address of the next instruction to be executed for this process. CPU registers. The registers vary in number and type, depending on the computer architecture. They include accum ...
... Process state. The state may be new, ready running, waiting, halted, and so on. Program counter. The counter indicates the address of the next instruction to be executed for this process. CPU registers. The registers vary in number and type, depending on the computer architecture. They include accum ...
Operating System Concepts
... When multiple applications are active at the same time, it is necessary to protect the data, I/O device access, and other resource use of each application from the rest. ...
... When multiple applications are active at the same time, it is necessary to protect the data, I/O device access, and other resource use of each application from the rest. ...
Figure 15.1 A distributed multimedia system
... Channel A message inserted in an outgoing message buffer never arrives at the other end’s incoming message buffer. Send-omission Process A process completes a send, but the message is not put in its outgoing message buffer. Receive-omission Process A message is put in a process’s incoming message bu ...
... Channel A message inserted in an outgoing message buffer never arrives at the other end’s incoming message buffer. Send-omission Process A process completes a send, but the message is not put in its outgoing message buffer. Receive-omission Process A message is put in a process’s incoming message bu ...
Document
... switching uses up CPU cycles also if critical sections are short spinning may be better than blocking static analysis of critical section duration can determine whether to spin or block dynamic analysis can improve performance ...
... switching uses up CPU cycles also if critical sections are short spinning may be better than blocking static analysis of critical section duration can determine whether to spin or block dynamic analysis can improve performance ...
COS 318: Operating Systems Processes and Threads Kai Li and Andy Bavier
... Example: many users can run the same program • Each process has its own address space, i.e., even though program has single set of variable names, each process will have different values ...
... Example: many users can run the same program • Each process has its own address space, i.e., even though program has single set of variable names, each process will have different values ...
Module 4: Processes
... Process Control Block (PCB) PCB stores the information associated with each process Process state Program counter CPU registers CPU scheduling information Memory-management information Accounting information I/O status information ...
... Process Control Block (PCB) PCB stores the information associated with each process Process state Program counter CPU registers CPU scheduling information Memory-management information Accounting information I/O status information ...
Module 4: Processes
... User interface - Almost all operating systems have a user interface (UI) ...
... User interface - Almost all operating systems have a user interface (UI) ...
ch2-OS-Structure
... layers. The bottom layer (layer 0), is the hardware; the highest (layer N) is the user interface. With modularity, layers are ...
... layers. The bottom layer (layer 0), is the hardware; the highest (layer N) is the user interface. With modularity, layers are ...
ppt - Portland State University
... user-level capability-based networking daemon used when receiver port is not on the kernel’s computer Forward messages between hosts Provides primitive network-wide name service ...
... user-level capability-based networking daemon used when receiver port is not on the kernel’s computer Forward messages between hosts Provides primitive network-wide name service ...
Scheduling Scheduling Criteria Scheduling algorithms Shortest Job
... Solution: Increase priority of processes after a while (Ageing) Eike Ritter ...
... Solution: Increase priority of processes after a while (Ageing) Eike Ritter ...
UNIX Notes:
... Since it started more than 50 years ago, UNIX has grown and changed in a different way from most operating systems. Many early UNIX users were computer and scientific professionals; more than a few of them extended UNIX by adding tools and functionality to do what they needed. UNIX was also used to ...
... Since it started more than 50 years ago, UNIX has grown and changed in a different way from most operating systems. Many early UNIX users were computer and scientific professionals; more than a few of them extended UNIX by adding tools and functionality to do what they needed. UNIX was also used to ...
UNIX Notes:
... Since it started more than 50 years ago, UNIX has grown and changed in a different way from most operating systems. Many early UNIX users were computer and scientific professionals; more than a few of them extended UNIX by adding tools and functionality to do what they needed. UNIX was also used to ...
... Since it started more than 50 years ago, UNIX has grown and changed in a different way from most operating systems. Many early UNIX users were computer and scientific professionals; more than a few of them extended UNIX by adding tools and functionality to do what they needed. UNIX was also used to ...