pdf
... When a process is running its Program Counter, stack pointer, registers, etc., are loaded on the CPU (I.e., the processor hardware registers contain the current values) When the OS stops running a process, it saves the current values of those registers into the PCB for that process. When the OS is r ...
... When a process is running its Program Counter, stack pointer, registers, etc., are loaded on the CPU (I.e., the processor hardware registers contain the current values) When the OS stops running a process, it saves the current values of those registers into the PCB for that process. When the OS is r ...
oslecture2
... Device controller transfers blocks of data from buffer storage directly to main memory without CPU ...
... Device controller transfers blocks of data from buffer storage directly to main memory without CPU ...
Processes
... understand the file system implemented by the “big” O/S kernel • File systems are complex data structures and different kernels implement them in different ways • The small version of the O/S is stored in a small, special-purpose file system that the BIOS does understand ...
... understand the file system implemented by the “big” O/S kernel • File systems are complex data structures and different kernels implement them in different ways • The small version of the O/S is stored in a small, special-purpose file system that the BIOS does understand ...
Operating Systems
... • Extensibility: facilitates the addition of new services as well as the provision of • multiple services in the same functional area. • Flexibility: not only can new • features be added to the operating system, but existing features can be subtracted to produce a smaller, more efficient implementat ...
... • Extensibility: facilitates the addition of new services as well as the provision of • multiple services in the same functional area. • Flexibility: not only can new • features be added to the operating system, but existing features can be subtracted to produce a smaller, more efficient implementat ...
What is Operating System (OS)
... secondary storage management – it consists of disks, tapes etc. Data in main memory is almost all the time being changed – all data cannot be stored there.So its written down as backup on secondary storage. But this space also have to be managed, allocated. protection system – multiple user computer ...
... secondary storage management – it consists of disks, tapes etc. Data in main memory is almost all the time being changed – all data cannot be stored there.So its written down as backup on secondary storage. But this space also have to be managed, allocated. protection system – multiple user computer ...
Overview and History
... 1. client sends connection request to server 2. server sets up two private communication ports and notifies client 3. messages are sent back and forth via the private ports 1. a shared section object is set up (shared memory) 2. client & server can communicate by writing/reading shared memory ...
... 1. client sends connection request to server 2. server sets up two private communication ports and notifies client 3. messages are sent back and forth via the private ports 1. a shared section object is set up (shared memory) 2. client & server can communicate by writing/reading shared memory ...
All of the above.
... priority inversion and why it occurs? • A process X with better priority is blocked waiting for a resource held by a process Y with worse priority because the resource is locked by process Y. • A process X with worse priority has its priority improved because a process Y with better priority is wait ...
... priority inversion and why it occurs? • A process X with better priority is blocked waiting for a resource held by a process Y with worse priority because the resource is locked by process Y. • A process X with worse priority has its priority improved because a process Y with better priority is wait ...
lec02
... Two kinds of events: synchronous and asynchronous Sync events are caused by executing instructions ...
... Two kinds of events: synchronous and asynchronous Sync events are caused by executing instructions ...
ppt
... There may be several processes running the same program (e.g., an editor), but each is a distinct process with its own representation. Each process has an execution state that indicates what it’s currently doing, e.g.: – ready : waiting for the CPU – running : executing instructions on the CPU – wai ...
... There may be several processes running the same program (e.g., an editor), but each is a distinct process with its own representation. Each process has an execution state that indicates what it’s currently doing, e.g.: – ready : waiting for the CPU – running : executing instructions on the CPU – wai ...
CPS 210 Course Intro - Duke Computer Science
... • One or more privileged execution modes (e.g., kernel mode) ...
... • One or more privileged execution modes (e.g., kernel mode) ...
Protection of System Resources
... Step 9. Call completes, may return to user level-level library call at instruction immediately following TRAP instruction. Count set to –1 if call failed or to number of bytes actually read if successful. Step 10. Library procedure returns to user program. Step 11. User program resets stack pointer ...
... Step 9. Call completes, may return to user level-level library call at instruction immediately following TRAP instruction. Count set to –1 if call failed or to number of bytes actually read if successful. Step 10. Library procedure returns to user program. Step 11. User program resets stack pointer ...
Software Engineering Syllabus
... Batch processing – the execution of jobs by collecting them in a single _____, then executing them _______ further _________ with the user ...
... Batch processing – the execution of jobs by collecting them in a single _____, then executing them _______ further _________ with the user ...
ppt - McMaster CAS Dept.
... PROCESSES AND PROGRAMS (I) Can have one program and many processes • When several users execute the same program (text editor, compiler, and so forth) at the same time, each execution of the program constitutes a separate process • A program that forks another sequential computation gives birth to ...
... PROCESSES AND PROGRAMS (I) Can have one program and many processes • When several users execute the same program (text editor, compiler, and so forth) at the same time, each execution of the program constitutes a separate process • A program that forks another sequential computation gives birth to ...
Software Engineering Syllabus
... Batch processing – the execution of jobs by collecting them in a single _____, then executing them _______ further _________ with the user ...
... Batch processing – the execution of jobs by collecting them in a single _____, then executing them _______ further _________ with the user ...
Interrupts
... • Since the exception handler can be called at any time, there cannot be any arguments passed or return value. ...
... • Since the exception handler can be called at any time, there cannot be any arguments passed or return value. ...
Device Drivers - EMU CMPE Home Page
... OS, and users applications and some parts of OS run on the 3 rd ring of privilege. Protected mode provides means for multitasking and segmented and paged virtual memory. Each user task gets 4G bytes of virtual address space. Maximal size of segment is 4Gb, size of page is 4Kb. States of tasks are sa ...
... OS, and users applications and some parts of OS run on the 3 rd ring of privilege. Protected mode provides means for multitasking and segmented and paged virtual memory. Each user task gets 4G bytes of virtual address space. Maximal size of segment is 4Gb, size of page is 4Kb. States of tasks are sa ...
Operating System Objectives and Functions
... Time sharing is multiprogramming. The key differences between time-sharing systems and batch multiprogramming systems are given in the table above. 3. Major Achievements Five major theoretical advances in development Processes Memory Management Information protection and security Scheduling and res ...
... Time sharing is multiprogramming. The key differences between time-sharing systems and batch multiprogramming systems are given in the table above. 3. Major Achievements Five major theoretical advances in development Processes Memory Management Information protection and security Scheduling and res ...
11.4 Software Operating Systems
... the OS has to switch between different processes thousands of times a second making sure that each process and application receives enough of the processor's time to function properly. ...
... the OS has to switch between different processes thousands of times a second making sure that each process and application receives enough of the processor's time to function properly. ...
Operating System Concepts
... Process Control Block • Attributes should include ‘everything a process cares about’ ! Process State- (running, ready etc) Program Counter- (address of the next instruction in the program to be executed) CPU registers (State of CPU registers- Data present in registers in processor while the p ...
... Process Control Block • Attributes should include ‘everything a process cares about’ ! Process State- (running, ready etc) Program Counter- (address of the next instruction in the program to be executed) CPU registers (State of CPU registers- Data present in registers in processor while the p ...
COS 318: Operating Systems OS Structures and System Calls
... OS Structures and System Calls Kai Li and Andy Bavier ...
... OS Structures and System Calls Kai Li and Andy Bavier ...
Introduction to OS
... time slice and time is also spent in context switching. Multiprocessor systems:- In Multiprocessor environment many processors executes the processes in synchronization with each other, thus reducing the time for execution. Q. Define interrupt. Ans: Interrupt is a request by any device for service. ...
... time slice and time is also spent in context switching. Multiprocessor systems:- In Multiprocessor environment many processors executes the processes in synchronization with each other, thus reducing the time for execution. Q. Define interrupt. Ans: Interrupt is a request by any device for service. ...