lecture1
... easily and efficiently than Database because files are related with the application and it have all the data needed for that application ...
... easily and efficiently than Database because files are related with the application and it have all the data needed for that application ...
All of the above.
... between different processes so that the output of each process does not interfere with the output of the other processes. • Spooling removed the need for small computers to do IO processing because the main computer could deal with slow IO devices without slowing the performance of the rest of the s ...
... between different processes so that the output of each process does not interfere with the output of the other processes. • Spooling removed the need for small computers to do IO processing because the main computer could deal with slow IO devices without slowing the performance of the rest of the s ...
2.01 - Faculty of Computer Science and Information Technology
... and file storage) may have special allocation code, others (such as I/O devices) may have general request and release code. ...
... and file storage) may have special allocation code, others (such as I/O devices) may have general request and release code. ...
Introduction to Operating Systems
... Again, this first result is not too interesting. The newly allocated memory is at address 0x200000. As the program runs, it slowly updates the value and prints out the result. Now, we again run multiple instances of this same program to see what happens (Figure 2.4). We see from the example that eac ...
... Again, this first result is not too interesting. The newly allocated memory is at address 0x200000. As the program runs, it slowly updates the value and prints out the result. Now, we again run multiple instances of this same program to see what happens (Figure 2.4). We see from the example that eac ...
ECE 175: Computer Programming for Engineering Applications
... 1. Load the host information contained in a file hosts.txt to an array of type host. The array must be dynamically allocated to store exactly the number of hosts contained in the file. 2. Ask the user to enter an IP address in the IP format x.y.z.w 3. Ask the user to enter the length of the network ...
... 1. Load the host information contained in a file hosts.txt to an array of type host. The array must be dynamically allocated to store exactly the number of hosts contained in the file. 2. Ask the user to enter an IP address in the IP format x.y.z.w 3. Ask the user to enter the length of the network ...
Chapter 2 Operating Systems Concepts
... • Files can be stored on several kinds of physical media ...
... • Files can be stored on several kinds of physical media ...
Operating System
... Figure 1 An operating system organises the system such that the CPU is able to do multi-programming. The processes involve both memory management and management of CPU time (process ...
... Figure 1 An operating system organises the system such that the CPU is able to do multi-programming. The processes involve both memory management and management of CPU time (process ...
Accepable Use and User Policies - Information Systems and Internet
... Don’t reveal a password over the phone Don’t reveal a password in an email message Don’t reveal a password to the boss Don’t reveal a password to co-workers Don’t hint at the format of a password Don’t share a password with family members ...
... Don’t reveal a password over the phone Don’t reveal a password in an email message Don’t reveal a password to the boss Don’t reveal a password to co-workers Don’t hint at the format of a password Don’t share a password with family members ...
IPS/IDS
... Two levels of security: 1. Basic physical perimeter security on campus Shared facilities can create cause for concern Workstations should remain locked and protected by the main physical perimeter at least ...
... Two levels of security: 1. Basic physical perimeter security on campus Shared facilities can create cause for concern Workstations should remain locked and protected by the main physical perimeter at least ...
ppt
... • in parent, fork() returns a non-zero integer • in child, fork() returns a zero. • difference allows parent and child to distinguish ...
... • in parent, fork() returns a non-zero integer • in child, fork() returns a zero. • difference allows parent and child to distinguish ...
Abstract View of System Components
... Hard real-time system. Deadline support – Secondary storage limited or absent, data stored in short-term memory, or read-only memory (ROM) – Conflicts with time-sharing systems, not supported by generalpurpose operating systems. – Examples: QNX, FreeRTOS, eCos, EROS, ChorusOS, pSOS Soft real-time sy ...
... Hard real-time system. Deadline support – Secondary storage limited or absent, data stored in short-term memory, or read-only memory (ROM) – Conflicts with time-sharing systems, not supported by generalpurpose operating systems. – Examples: QNX, FreeRTOS, eCos, EROS, ChorusOS, pSOS Soft real-time sy ...
What is an Operating System?
... trap or interrupt occurs, the hardware switches from user mode to kernel mode (that is, changes the state of the mode bit to 0). Thus, whenever the operating system gains control of the computer, it is in kernel mode. The system always switches to user mode (by setting the mode bit to 1) before pass ...
... trap or interrupt occurs, the hardware switches from user mode to kernel mode (that is, changes the state of the mode bit to 0). Thus, whenever the operating system gains control of the computer, it is in kernel mode. The system always switches to user mode (by setting the mode bit to 1) before pass ...
Slide 1
... OS, Linux, Android, and Google Chrome. Each has strengths and weaknesses that are important to understand. Which of the following statements is correct? – A. Google Chrome is built on the Windows kernel, so it is ideal for netbooks because it has good resistance to malware. – B. If you don’t like th ...
... OS, Linux, Android, and Google Chrome. Each has strengths and weaknesses that are important to understand. Which of the following statements is correct? – A. Google Chrome is built on the Windows kernel, so it is ideal for netbooks because it has good resistance to malware. – B. If you don’t like th ...
slides
... • A virtual machine takes the layered approach to its logical conclusion. It treats hardware and the operating system kernel as though they were all hardware. • A virtual machine provides an interface identical to the underlying bare hardware. • The operating system creates the illusion of multiple ...
... • A virtual machine takes the layered approach to its logical conclusion. It treats hardware and the operating system kernel as though they were all hardware. • A virtual machine provides an interface identical to the underlying bare hardware. • The operating system creates the illusion of multiple ...
System Calls
... a user to interface with the operating system through the command line A second strategy is through a graphical user interface (GUI) All operating systems have an interface to it that is accessible by users/user programs ...
... a user to interface with the operating system through the command line A second strategy is through a graphical user interface (GUI) All operating systems have an interface to it that is accessible by users/user programs ...
No Slide Title
... NT uses objects for all its services and entities; the object manger supervises the use of all the objects. – Generates an object handle – Checks security. – Keeps track of which processes are using each object. Objects are manipulated by a standard set of methods, namely create, open, close, delete ...
... NT uses objects for all its services and entities; the object manger supervises the use of all the objects. – Generates an object handle – Checks security. – Keeps track of which processes are using each object. Objects are manipulated by a standard set of methods, namely create, open, close, delete ...
Operating Systems Operating Systems Operating Systems
... straightforward. The operating system allows the application to begin running, suspending the execution only long enough to deal with interrupts and d user iinput. t – Interrupts are special signals sent by hardware or software to the CPU looking for the its attention. – Sometimes the operating syst ...
... straightforward. The operating system allows the application to begin running, suspending the execution only long enough to deal with interrupts and d user iinput. t – Interrupts are special signals sent by hardware or software to the CPU looking for the its attention. – Sometimes the operating syst ...
Section 3
... • By mid-1960s, IBM was in danger of going broke • Meanwhile, IBM’s old products were not selling well and there was nothing new to replace them ...
... • By mid-1960s, IBM was in danger of going broke • Meanwhile, IBM’s old products were not selling well and there was nothing new to replace them ...
Overview of Database Security
... A code segment hidden within a program; a special input will start this segment and allow its owner to skip the protection mechanisms and to access the database beyond his or her privileges ...
... A code segment hidden within a program; a special input will start this segment and allow its owner to skip the protection mechanisms and to access the database beyond his or her privileges ...
Modes of Processing - Bangor Grammar School
... OS modes of operation Multi-user • Numerous users (a few users up to thousands of users) can use the system simultaneously • Resources (processor time/peripherals) are shared among the users using time slicing • The users are generally unaware of the other users • The OS must make sure that the res ...
... OS modes of operation Multi-user • Numerous users (a few users up to thousands of users) can use the system simultaneously • Resources (processor time/peripherals) are shared among the users using time slicing • The users are generally unaware of the other users • The OS must make sure that the res ...
Lect 1 - Intro
... A program that attaches itself to a program or file so it can spread from one computer to another, leaving infections as it travels Worm: A program that takes advantage of file or information transport features on your system, which allows it to travel unaided. The biggest danger with a worm is its ...
... A program that attaches itself to a program or file so it can spread from one computer to another, leaving infections as it travels Worm: A program that takes advantage of file or information transport features on your system, which allows it to travel unaided. The biggest danger with a worm is its ...
A Five-State Process Model (Review) The not
... Selects job from spooled jobs, and loads it into memory ...
... Selects job from spooled jobs, and loads it into memory ...
PPT
... and file storage) may have special allocation code, others (such as I/O devices) may have general request and release code. ...
... and file storage) may have special allocation code, others (such as I/O devices) may have general request and release code. ...