Answer
... There are instances where processes need to communicate with each other to exchange information. It may be between processes running on the same computer or running on the different computers. By providing this service the operating system relieves the user of the worry of passing messages between p ...
... There are instances where processes need to communicate with each other to exchange information. It may be between processes running on the same computer or running on the different computers. By providing this service the operating system relieves the user of the worry of passing messages between p ...
Operating System Overview
... – Program should only depend on input to it, not on the activities of other programs ...
... – Program should only depend on input to it, not on the activities of other programs ...
What is an operating system (OS)?
... time so when the OS turns control over to a user program it has “lost control.” Modifications to the CPU timer are privileged 2) Dual-Mode Operation - the CPU has two (or more) modes of operation: user mode and system(/supervisor/monitor/privileged) mode with some privileged instructions only execut ...
... time so when the OS turns control over to a user program it has “lost control.” Modifications to the CPU timer are privileged 2) Dual-Mode Operation - the CPU has two (or more) modes of operation: user mode and system(/supervisor/monitor/privileged) mode with some privileged instructions only execut ...
Ceng 334 - Operating Systems
... Layered System (Cont.) 0. Process switching, multi programming, CPU scheduling 1. Memory and swap space (disk) management (“segment controller”) 2. Message interpretation, job control (JCL) functions 3. I/O management (virtual peripherals) 4. User programs 5. Operator ...
... Layered System (Cont.) 0. Process switching, multi programming, CPU scheduling 1. Memory and swap space (disk) management (“segment controller”) 2. Message interpretation, job control (JCL) functions 3. I/O management (virtual peripherals) 4. User programs 5. Operator ...
after_introduction
... • Consider a control system: 1. Brake Sensor: When it detects a brake action, it must actuate the brakes within 20ms. The execution time is 5ms. 2. AC Button: It must start the AC within 4s after it detects the button press. The execution time is 500ms. 3. Cruise Control button. It must activate the ...
... • Consider a control system: 1. Brake Sensor: When it detects a brake action, it must actuate the brakes within 20ms. The execution time is 5ms. 2. AC Button: It must start the AC within 4s after it detects the button press. The execution time is 500ms. 3. Cruise Control button. It must activate the ...
Protection
... Malicious application can’t take control User data is protected from untrusted users and programs ...
... Malicious application can’t take control User data is protected from untrusted users and programs ...
Operating System Overview
... – Program should only depend on input to it, not on the activities of other programs ...
... – Program should only depend on input to it, not on the activities of other programs ...
Operating System Software The OS
... First software we see when we turn on the computer, and the last software we see when the computer is turned off. Enables all the programs we use. Not all computers have operating systems. The computer that controls the microwave oven in your kitchen doesn't need an operating system. The computer in ...
... First software we see when we turn on the computer, and the last software we see when the computer is turned off. Enables all the programs we use. Not all computers have operating systems. The computer that controls the microwave oven in your kitchen doesn't need an operating system. The computer in ...
Chap-2-Architecture
... Kernel space is the region of memory where all kernel services are provided via kernel processes Any process executing in kernel space is said to be executing in kernel mode Kernel space is a privileged area; the user has access to it only through the system call interface A user does not have direc ...
... Kernel space is the region of memory where all kernel services are provided via kernel processes Any process executing in kernel space is said to be executing in kernel mode Kernel space is a privileged area; the user has access to it only through the system call interface A user does not have direc ...
PPT
... if an application is in the middle of execution) Interrupt handler saves the context of the current process and then uses the interrupt type to index into a vector table of routines Control switches to the procedure registered in the table to handle the specific interrupt ...
... if an application is in the middle of execution) Interrupt handler saves the context of the current process and then uses the interrupt type to index into a vector table of routines Control switches to the procedure registered in the table to handle the specific interrupt ...
pdf
... Some early computers protected the operating system by placing it in a memory partition that could not be modified by either the user job or the operating system itself. Describe two difficulties that you think could arise with such a scheme. Answer: The data required by the operating system (passwo ...
... Some early computers protected the operating system by placing it in a memory partition that could not be modified by either the user job or the operating system itself. Describe two difficulties that you think could arise with such a scheme. Answer: The data required by the operating system (passwo ...
CS111—Operating System Principles
... directly or indirectly created by process 1. The init process also controls transitions between different runlevels: ...
... directly or indirectly created by process 1. The init process also controls transitions between different runlevels: ...
2. OS Components
... Protection & Security refer to a mechanism for controlling access by programs, processes, or users to both system and user resources The protection mechanism: When several separate processes execute concurrently, it should not be ...
... Protection & Security refer to a mechanism for controlling access by programs, processes, or users to both system and user resources The protection mechanism: When several separate processes execute concurrently, it should not be ...
on Processes
... another process (child process) by calling fork the child process is created as a copy of the parent process (process image and process control structure) except for the identification and scheduling state parent and child processes run on two different address spaces => by default no memory shari ...
... another process (child process) by calling fork the child process is created as a copy of the parent process (process image and process control structure) except for the identification and scheduling state parent and child processes run on two different address spaces => by default no memory shari ...
VMS-Spr-2001-sect-1-group
... • 16-31 is a high priority real-time process • 0-15 is a normal process • Normal processes are moved up in the queue if they are critical to the operating environment ...
... • 16-31 is a high priority real-time process • 0-15 is a normal process • Normal processes are moved up in the queue if they are critical to the operating environment ...
OsQuestionPaper
... 3 Multitasking does not imply multiprocessing 4 Multithreading implies multi-user In one of the deadlock prevention methods, impose a total ordering of all resource types, and require that each process requests resources in an increasing order of enumeration. This violates the _______________ condit ...
... 3 Multitasking does not imply multiprocessing 4 Multithreading implies multi-user In one of the deadlock prevention methods, impose a total ordering of all resource types, and require that each process requests resources in an increasing order of enumeration. This violates the _______________ condit ...
Solaris Symmetric Multiprocessing
... operating system. There is no master processor. Windows 2000 incorporates several features that are crucial to its success as a multiprocessor operating system: •The ability to run operating system code on any available processor and on multiple processors at the same time •Multiple threads of execu ...
... operating system. There is no master processor. Windows 2000 incorporates several features that are crucial to its success as a multiprocessor operating system: •The ability to run operating system code on any available processor and on multiple processors at the same time •Multiple threads of execu ...
Operating- System Structures
... List five services provided by an operating system. Explain how each provides convenience to the users. Explain also in which cases it would be impossible for user-level programs to provide these services. Answer: a. Program execution. The operating system loads the contents (or sections) of a file ...
... List five services provided by an operating system. Explain how each provides convenience to the users. Explain also in which cases it would be impossible for user-level programs to provide these services. Answer: a. Program execution. The operating system loads the contents (or sections) of a file ...
Document
... Advantages: faster execution; easy to use by the programmers. Disadvantages: bigger size of the command-interpreter; needs changes for new commands. All commands are implemented through special system programs. Command file is loaded in the memory and executed. Advantages : small size of com ...
... Advantages: faster execution; easy to use by the programmers. Disadvantages: bigger size of the command-interpreter; needs changes for new commands. All commands are implemented through special system programs. Command file is loaded in the memory and executed. Advantages : small size of com ...
Evolution of Operating System
... Operating Systems usually come with some associated utility programs UNIX usually has the text editors emacs and vi (and sometimes pico) UNIX has it’s own sort utility UNIX has it’s own mail utility ...
... Operating Systems usually come with some associated utility programs UNIX usually has the text editors emacs and vi (and sometimes pico) UNIX has it’s own sort utility UNIX has it’s own mail utility ...
2. Operating System Overview
... – Program should only depend on input to it, not on the activities of other programs ...
... – Program should only depend on input to it, not on the activities of other programs ...