Operating System Structures
... • Services that operating system provides to programs • Program execution (loading into memory and starting) • I/O operations — because programs can not usually access peripheral devices directly, operating system must offer services for it • File system manipulation — file creation, deletion, readi ...
... • Services that operating system provides to programs • Program execution (loading into memory and starting) • I/O operations — because programs can not usually access peripheral devices directly, operating system must offer services for it • File system manipulation — file creation, deletion, readi ...
LESSON PLAN PCCS4304 OPERATING SYSTEM (3-0-0)
... they need memory management and protection. To obtain less response time jobs are swapped in and out of main memory to disk. So disk will serve as backing store for main memory. This can be achieved by using a technique called virtual memory that allows for the execution of job i.e. not complete in ...
... they need memory management and protection. To obtain less response time jobs are swapped in and out of main memory to disk. So disk will serve as backing store for main memory. This can be achieved by using a technique called virtual memory that allows for the execution of job i.e. not complete in ...
1 Interprocess Communication Cooperating Processes The
... this situation, the consumer must wait until an item is produced. The unbounded-‐buffer producer i.e. the consumer problem places no practical limit on the size of the buffer. The consumer may have ...
... this situation, the consumer must wait until an item is produced. The unbounded-‐buffer producer i.e. the consumer problem places no practical limit on the size of the buffer. The consumer may have ...
I/O subsystem
... To cope with device speed mismatch To cope with device transfer size mismatch ...
... To cope with device speed mismatch To cope with device transfer size mismatch ...
Lecture 11
... Every executing program is treated as a process. The OS performs various functions with process: ...
... Every executing program is treated as a process. The OS performs various functions with process: ...
Slide 1
... Every executing program is treated as a process. The OS performs various functions with process: ...
... Every executing program is treated as a process. The OS performs various functions with process: ...
Chapter 3 Process Description and Control
... – How are processes represented and controlled by the OS. – Process states which characterize the behaviour of processes. – Data structures used to manage processes. – Ways in which the OS uses these data structures to control process execution. – Discuss process management in UNIX SVR4. ...
... – How are processes represented and controlled by the OS. – Process states which characterize the behaviour of processes. – Data structures used to manage processes. – Ways in which the OS uses these data structures to control process execution. – Discuss process management in UNIX SVR4. ...
William Stallings Computer Organization and Architecture
... • Simplifies handling of growing data structures • Allows programs to be altered and recompiled independently, without re-linking and re-loading • Lends itself to sharing among processes • Lends itself to protection • Some systems combine segmentation with ...
... • Simplifies handling of growing data structures • Allows programs to be altered and recompiled independently, without re-linking and re-loading • Lends itself to sharing among processes • Lends itself to protection • Some systems combine segmentation with ...
Introduction
... a UID (User IDentification). A process is assigned a PID (Process IDentification). • Users can be members of groups, each of which has a GID (Group IDentification). • The superuser (root in UNIX) has special privilege to violate many of the protection rules. • In UNIX, use the command ‘ps’ to know t ...
... a UID (User IDentification). A process is assigned a PID (Process IDentification). • Users can be members of groups, each of which has a GID (Group IDentification). • The superuser (root in UNIX) has special privilege to violate many of the protection rules. • In UNIX, use the command ‘ps’ to know t ...
Chapter 3: Operating-System Structures • System Components
... Additional Operating System Functions Additional functions exist not for helping the user, but rather for ensuring efficient system operations. • Resource allocation – allocating resources, such as CPU cycles, main memory, file storage, I/O devices, to multiple users or multiple jobs running at the ...
... Additional Operating System Functions Additional functions exist not for helping the user, but rather for ensuring efficient system operations. • Resource allocation – allocating resources, such as CPU cycles, main memory, file storage, I/O devices, to multiple users or multiple jobs running at the ...
Overview of OS/2
... of physical addresses available is called physical address space. Virtual memory systems have the characteristic of allowing a program or process to be independent of its actual position in physical memory, whether all or part of that program or process is in physical memory. The address translation ...
... of physical addresses available is called physical address space. Virtual memory systems have the characteristic of allowing a program or process to be independent of its actual position in physical memory, whether all or part of that program or process is in physical memory. The address translation ...
Operating Systems
... Processor (at a certain point in time) o is executing instructions from a portion of the Monitor residing in Main Memory that cause the next job to be read into Main Memory o encounters a branch instruction that leads the processor to start executing the new job o encounters either an end statement ...
... Processor (at a certain point in time) o is executing instructions from a portion of the Monitor residing in Main Memory that cause the next job to be read into Main Memory o encounters a branch instruction that leads the processor to start executing the new job o encounters either an end statement ...
The Mach System Abraham Silberschatz, Peter Baer Galvin, Greg
... objects where possible – avoids object copy Uses virtual memory re-mapping to transfer large messages – also known as virtual copy or copy-on-write. Memory management is based on the use of memory objects Memory objects may reside on remote systems and accessed transparently ...
... objects where possible – avoids object copy Uses virtual memory re-mapping to transfer large messages – also known as virtual copy or copy-on-write. Memory management is based on the use of memory objects Memory objects may reside on remote systems and accessed transparently ...
lec1
... A program in execution, An entity that can be assigned to and executed on a processes, It is a unit of work. Multiprogramming, time-sharing and real-time transaction systems lead to the refinement of the concept of process. A process can be defined by its attributes and behaviors : it can be viewed ...
... A program in execution, An entity that can be assigned to and executed on a processes, It is a unit of work. Multiprogramming, time-sharing and real-time transaction systems lead to the refinement of the concept of process. A process can be defined by its attributes and behaviors : it can be viewed ...
ppt
... • Output data from child to parent (via wait). • Process’ resources are deallocated by operating system. ...
... • Output data from child to parent (via wait). • Process’ resources are deallocated by operating system. ...
PPT - Course Website Directory
... System calls for process management Example of fork used in simplified shell program ...
... System calls for process management Example of fork used in simplified shell program ...
OS/2 API
... compatibility environment. •DOS applications can be run full screen, windowed, or iconized in the background. •Since DOS environments are swappable, starting many DOS sessions does not drive up the system memory requirements. ...
... compatibility environment. •DOS applications can be run full screen, windowed, or iconized in the background. •Since DOS environments are swappable, starting many DOS sessions does not drive up the system memory requirements. ...
Operating-System Structure
... Chapter 2: Operating-System Structures Operating System Services User Operating System Interface System Calls Types of System Calls System Programs Operating System Design and Implementation Operating System Structure ...
... Chapter 2: Operating-System Structures Operating System Services User Operating System Interface System Calls Types of System Calls System Programs Operating System Design and Implementation Operating System Structure ...
Module 4: Processes
... Silberschatz, Galvin and Gagne 2002 Modified for CSCI 399, Royden, 2005 ...
... Silberschatz, Galvin and Gagne 2002 Modified for CSCI 399, Royden, 2005 ...
Introduction to Object Technology
... – internal and external hardware errors • memory error • device failure ...
... – internal and external hardware errors • memory error • device failure ...
Introduction to Operating Systems
... Each device controller is in charge of a particular device type Each device controller has a local buffer. I/O is from the device to local buffer of controller ...
... Each device controller is in charge of a particular device type Each device controller has a local buffer. I/O is from the device to local buffer of controller ...