Chapter 3 Process Description and Control Major
... ring, or some other structure. For example, all processes in a waiting state for a particular priority level may be linked in a queue. A process may exhibit a parent-child (creator-created) relationship with another process. The process control block may contain pointers to other processes to suppor ...
... ring, or some other structure. For example, all processes in a waiting state for a particular priority level may be linked in a queue. A process may exhibit a parent-child (creator-created) relationship with another process. The process control block may contain pointers to other processes to suppor ...
Protection A computer system is a collection of processes and
... As mentioned before, a computer system consists of processes and objects. Each object has a unique identifier in the system, and can be accessed only through well-defined and meaningul operations. For example, a memory segment (object) supports read and write (operations) while a CD-ROM (object) sup ...
... As mentioned before, a computer system consists of processes and objects. Each object has a unique identifier in the system, and can be accessed only through well-defined and meaningul operations. For example, a memory segment (object) supports read and write (operations) while a CD-ROM (object) sup ...
4 - Operating System Basics.ppt
... – Take up little space on disk – Run on inexpensive computers ...
... – Take up little space on disk – Run on inexpensive computers ...
Birla Institute of Technology and Science, Pilani - WILP
... organization; Instruction Set and its characteristics; Processor Structure and its functions, Instruction cycle, Instruction Pipeline; Concept of assembler, linker & loader; Types of operating systems; Concept of process; OS functions: Process scheduling, Memory Management, I/O management and relate ...
... organization; Instruction Set and its characteristics; Processor Structure and its functions, Instruction cycle, Instruction Pipeline; Concept of assembler, linker & loader; Types of operating systems; Concept of process; OS functions: Process scheduling, Memory Management, I/O management and relate ...
Interprocess Communication (IPC)
... – Fast bidirectional communication among any number of processes – Saves Resources • Cons – Needs concurrency control (leads to data inconsistencies like ‘Lost update’) – Lack of data protection from Operating System (OS) ...
... – Fast bidirectional communication among any number of processes – Saves Resources • Cons – Needs concurrency control (leads to data inconsistencies like ‘Lost update’) – Lack of data protection from Operating System (OS) ...
On-Line & Real-Time Modes of Use Presentation
... operating personnel can operate a complex process from a central control room. Process control may either use feedback or it may be open loop. Control may also be continuous (car cruise control) or cause a sequence of discreet events, such as a timer on a lawn sprinkler or thermostat on a heater (on ...
... operating personnel can operate a complex process from a central control room. Process control may either use feedback or it may be open loop. Control may also be continuous (car cruise control) or cause a sequence of discreet events, such as a timer on a lawn sprinkler or thermostat on a heater (on ...
Chapter 3 Process Description and Control
... • There must be some way that a process can indicate completion. • This indication may be: – A HALT instruction for termination in a batch job – A user action (e.g. log off, quitting an application) – A fault or error – Parent process terminating ...
... • There must be some way that a process can indicate completion. • This indication may be: – A HALT instruction for termination in a batch job – A user action (e.g. log off, quitting an application) – A fault or error – Parent process terminating ...
PDF
... m Abstract the raw hardware m Protect apps from each other m Not allow applications to monopolize more that their fair share of system resources m Provide desired functionality m Expose the raw capability of the hardware, minimizing the “tax” m Optimize for the expected (any?) workload m Be simple e ...
... m Abstract the raw hardware m Protect apps from each other m Not allow applications to monopolize more that their fair share of system resources m Provide desired functionality m Expose the raw capability of the hardware, minimizing the “tax” m Optimize for the expected (any?) workload m Be simple e ...
Operating System
... • A UNIX program consists of code – does something or other, – making system calls to have certain services performed. ...
... • A UNIX program consists of code – does something or other, – making system calls to have certain services performed. ...
ppt
... • Fork a process (one kernel thread, one or more userlevel threads) – Creates an address space that’s a clone of the parent – In the kernel, there’s a new PCB that describes the child’s address space and OS resources – A kernel thread is created – there’s a new kernel TCB that’s “linked” to the new ...
... • Fork a process (one kernel thread, one or more userlevel threads) – Creates an address space that’s a clone of the parent – In the kernel, there’s a new PCB that describes the child’s address space and OS resources – A kernel thread is created – there’s a new kernel TCB that’s “linked” to the new ...
Operating Systems
... – resource allocation – time management - process scheduling – memory management - usage models and page allocation ...
... – resource allocation – time management - process scheduling – memory management - usage models and page allocation ...
Scheduling
... ready queue, giving each a time slice, after which it is preempted by a timer interrupt and the next process is started – useful for time sharing multitasking systems - most widely used scheduling algorithm – combines FCFS and preemption ...
... ready queue, giving each a time slice, after which it is preempted by a timer interrupt and the next process is started – useful for time sharing multitasking systems - most widely used scheduling algorithm – combines FCFS and preemption ...
Slides. - Department of Computer Science and Information Systems
... 4. Memory management 5. Input/output 6. File systems 7. Multimedia operating systems 8. Multiple processor systems 9. Security UNIX and Windows are to be used as running case studies. ...
... 4. Memory management 5. Input/output 6. File systems 7. Multimedia operating systems 8. Multiple processor systems 9. Security UNIX and Windows are to be used as running case studies. ...
Processor Folding for Linux
... other operating systems on the machine. This process currently only happens when the processor is not being used. Consider for a moment what would happen if an operating system with three processors allocated to it uses only 20% of each processor. Much of the processing power would be wasted. A new ...
... other operating systems on the machine. This process currently only happens when the processor is not being used. Consider for a moment what would happen if an operating system with three processors allocated to it uses only 20% of each processor. Much of the processing power would be wasted. A new ...
lecture5-sept15
... fork() • Recall: Processes use system calls to request services from the OS • OS provides a system call called fork() that a process can use to request the creation of a new process • OS creates a new PCB when fork() is called with a unique id for the new process • The calling process is the parent, ...
... fork() • Recall: Processes use system calls to request services from the OS • OS provides a system call called fork() that a process can use to request the creation of a new process • OS creates a new PCB when fork() is called with a unique id for the new process • The calling process is the parent, ...
3. Data Communications
... System 7, DOS and Windows, are single user, designed for one person at a desktop computer Windows NT and UNIX on the other hand are network operating systems, because they are designed to manage multiple user requests at the same time ...
... System 7, DOS and Windows, are single user, designed for one person at a desktop computer Windows NT and UNIX on the other hand are network operating systems, because they are designed to manage multiple user requests at the same time ...
Language Based Operating Systems
... that is compiled to some intermediate language for execution or interpretation by a VM. Such languages are usually very high level (abstract) and provide expressive features. ...
... that is compiled to some intermediate language for execution or interpretation by a VM. Such languages are usually very high level (abstract) and provide expressive features. ...
Lecture 6
... Operating systems provide an environment for execution of programs and services to programs and users One set of operating-system services provides functions that are helpful to the user: – User interface - Almost all operating systems have a user interface (UI). ...
... Operating systems provide an environment for execution of programs and services to programs and users One set of operating-system services provides functions that are helpful to the user: – User interface - Almost all operating systems have a user interface (UI). ...
Chapter 5 Concurrency: Mutual Exclusion and Synchronization
... The final value or state of a CR shared by concurrently executing processes is the same as the final value or state would be if each process executed serially, in some order. ...
... The final value or state of a CR shared by concurrently executing processes is the same as the final value or state would be if each process executed serially, in some order. ...
Operating Systems - inst.eecs.berkeley.edu
... – Consider a web server: while it’s waiting for a response from one client, it could read a request for another client – Consider a browser: while it’s waiting for a response from a web server, it wants to react to mouse or keyboard input Concurrency increases/enables responsiveness ...
... – Consider a web server: while it’s waiting for a response from one client, it could read a request for another client – Consider a browser: while it’s waiting for a response from a web server, it wants to react to mouse or keyboard input Concurrency increases/enables responsiveness ...