Operating-System Structures
... • Communication – Processes may exchange information, on the same computer or between computers over a network – Implemented via shared memory or message passing. • Error detection – ensure correct computing by detecting errors in the CPU and memory hardware, in I/O devices, or in user programs. A. ...
... • Communication – Processes may exchange information, on the same computer or between computers over a network – Implemented via shared memory or message passing. • Error detection – ensure correct computing by detecting errors in the CPU and memory hardware, in I/O devices, or in user programs. A. ...
operation
... • Clear kernel interface supports modular structure. • Realization of services outside the kernel: • leads to more security and stability since the kernel will not be affected by faulty services, • improves flexibility and extendibility since services can be added and removed arbitrarily, even durin ...
... • Clear kernel interface supports modular structure. • Realization of services outside the kernel: • leads to more security and stability since the kernel will not be affected by faulty services, • improves flexibility and extendibility since services can be added and removed arbitrarily, even durin ...
ppt - Erlang/OTP
... obtain easy portability between processor architectures • Simple non/hierarchical module system • Erlang shell allows testing of functions directly without any special test programs • Virtual machine support for debugging and fault tracing • Dynamic code replacement also very useful while developing ...
... obtain easy portability between processor architectures • Simple non/hierarchical module system • Erlang shell allows testing of functions directly without any special test programs • Virtual machine support for debugging and fault tracing • Dynamic code replacement also very useful while developing ...
as a PDF
... One program shouldn’t steal or alter another’s data Stop or clean up a program when it does something wrong ...
... One program shouldn’t steal or alter another’s data Stop or clean up a program when it does something wrong ...
Machine and Operating System Organization
... • The system call interface invokes intended system call in OS kernel and returns status of the system call and any return values • The caller need know nothing about how the system call is implemented Just needs to obey API and understand what OS will do as a result call Most details of OS in ...
... • The system call interface invokes intended system call in OS kernel and returns status of the system call and any return values • The caller need know nothing about how the system call is implemented Just needs to obey API and understand what OS will do as a result call Most details of OS in ...
ch02
... CPU can access directly. To allow convenient access to I/O devices, memory-mapped I/O set aside ranges of memory addresses and mapped to the device registers. Read and writes to these memory addresses cause the data to be transferred to and from the device registers. ...
... CPU can access directly. To allow convenient access to I/O devices, memory-mapped I/O set aside ranges of memory addresses and mapped to the device registers. Read and writes to these memory addresses cause the data to be transferred to and from the device registers. ...
The Abstraction: Address Spaces
... [DV66], in which multiple processes were ready to run at a given time, and the OS would switch between them, for example when one decided to perform an I/O. Doing so increased the effective utilization of the CPU. Such increases in efficiency were particularly important in those days where each mach ...
... [DV66], in which multiple processes were ready to run at a given time, and the OS would switch between them, for example when one decided to perform an I/O. Doing so increased the effective utilization of the CPU. Such increases in efficiency were particularly important in those days where each mach ...
Operating Systems
... Name: The symbolic file name is the only information kept in human-readable form Type: This is needed for the OS in order to decode/process data in the file ...
... Name: The symbolic file name is the only information kept in human-readable form Type: This is needed for the OS in order to decode/process data in the file ...
CSCI1412 - Introduction & Overview
... Computer-System Operation • I/O devices and the CPU can execute concurrently. • Device controller is in charge of own device. • Each device controller has a local buffer. • CPU moves data from main memory to local buffers, or vice versa • Device controller informs CPU of its operation by causing an ...
... Computer-System Operation • I/O devices and the CPU can execute concurrently. • Device controller is in charge of own device. • Each device controller has a local buffer. • CPU moves data from main memory to local buffers, or vice versa • Device controller informs CPU of its operation by causing an ...
Operating system
... 1. Hardware – provides basic computing resources (CPU, memory, I/O devices). 2. Operating system – controls and coordinates the use of the hardware among the various application programs for the various users. 3. Applications programs – define the ways in which the system resources are used to solve ...
... 1. Hardware – provides basic computing resources (CPU, memory, I/O devices). 2. Operating system – controls and coordinates the use of the hardware among the various application programs for the various users. 3. Applications programs – define the ways in which the system resources are used to solve ...
PPT Chapter 02
... form the core of the operating system – Implements control functions – Set of services to user programs – Exists in memory during operation of the OS ...
... form the core of the operating system – Implements control functions – Set of services to user programs – Exists in memory during operation of the OS ...
as a PDF
... low priority, or a process which is page faulting frequently, or a process which is taking up a large amount of memory in order to free up main memory for other processes, swapping the process back in later when more memory is available, or when the process has been unblocked and is no longer waitin ...
... low priority, or a process which is page faulting frequently, or a process which is taking up a large amount of memory in order to free up main memory for other processes, swapping the process back in later when more memory is available, or when the process has been unblocked and is no longer waitin ...
2. Operating System Models
... Todays operating systems provide two fundamental services for users. First, they make the computer hardware easier to use. They create a virtual machine that differs markedly from the real machine. Indeed, the computer revolution of the last two decades is due, in part, to the success that operatin ...
... Todays operating systems provide two fundamental services for users. First, they make the computer hardware easier to use. They create a virtual machine that differs markedly from the real machine. Indeed, the computer revolution of the last two decades is due, in part, to the success that operatin ...
What is an Operating System? - University of Central Florida
... hardware, operating system, software) Information in use copied from slower to faster storage temporarily Faster storage (cache) checked first to determine if information is ...
... hardware, operating system, software) Information in use copied from slower to faster storage temporarily Faster storage (cache) checked first to determine if information is ...
Processes
... fork system call creates new process exec system call used after a fork to replace the process’ memory space with a new program. ...
... fork system call creates new process exec system call used after a fork to replace the process’ memory space with a new program. ...
CTE214 Operating Systems Syllabus
... internal operations of modern operating systems as well as practical system-administration tasks that an ICT employee may need in his/her career. In particular; • Basic operating system concepts and structures. • Particular emphasis will be given to the following major OS subsystems: o Process manag ...
... internal operations of modern operating systems as well as practical system-administration tasks that an ICT employee may need in his/her career. In particular; • Basic operating system concepts and structures. • Particular emphasis will be given to the following major OS subsystems: o Process manag ...
Module 6: CPU Scheduling
... 1. Process switches from running to waiting state 2. Process switches from running to ready state 3. Process switches from waiting to ready ...
... 1. Process switches from running to waiting state 2. Process switches from running to ready state 3. Process switches from waiting to ready ...
Windows2000-Spr-2001-sect-2-group
... • Threads of lower priority are preempted so the higher priority threads can have access to the processor when they are ready • In the real time class, where all threads have a fixed priority that never changes, threads of equal priority are in a round-robin queue • In the variable priority class, a ...
... • Threads of lower priority are preempted so the higher priority threads can have access to the processor when they are ready • In the real time class, where all threads have a fixed priority that never changes, threads of equal priority are in a round-robin queue • In the variable priority class, a ...
Unix processes and threads
... Fundamental to almost all operating systems = program in execution address space, usually separate program counter, stack pointer, hardware registers simple computer: one program, never stops 23-May-17 ...
... Fundamental to almost all operating systems = program in execution address space, usually separate program counter, stack pointer, hardware registers simple computer: one program, never stops 23-May-17 ...
Figure 5.01 - College of the Holy Cross
... Threads allow a program to continue running even if part is ...
... Threads allow a program to continue running even if part is ...
CS540_Ch19
... ◦ Real-time systems are typically single-purpose ◦ Real-time systems often do not require interfacing with a user ◦ Features found in a desktop PC require more substantial hardware that what is typically unavailable in a real-time system due to lack of memory and fast processors. Both of these are ...
... ◦ Real-time systems are typically single-purpose ◦ Real-time systems often do not require interfacing with a user ◦ Features found in a desktop PC require more substantial hardware that what is typically unavailable in a real-time system due to lack of memory and fast processors. Both of these are ...
Introduction to Operating Systems
... Must be in supervisor mode to write appropriate I/O registers User code cannot re-program interval timer Regains control whenever interval timer fires Gives CPU to another process if someone else needs it Note: must be in supervisor mode to set interrupt entry points No way for user code to hijack i ...
... Must be in supervisor mode to write appropriate I/O registers User code cannot re-program interval timer Regains control whenever interval timer fires Gives CPU to another process if someone else needs it Note: must be in supervisor mode to set interrupt entry points No way for user code to hijack i ...
Chapter 19 Real
... The Processing times are t1 = 20 for P1 and t2 = 35 for P2. The deadline for each process requires that it complete its CPU burst by the start of its next period. The CPU utilization of a process Pi as the ratio of its burst to its period – ti/pi so, for P1 it is 20/50 = 0.40 and for P2 it is 35/100 ...
... The Processing times are t1 = 20 for P1 and t2 = 35 for P2. The deadline for each process requires that it complete its CPU burst by the start of its next period. The CPU utilization of a process Pi as the ratio of its burst to its period – ti/pi so, for P1 it is 20/50 = 0.40 and for P2 it is 35/100 ...
CH17-COA9e
... the same as the concept of software threads in a multiprogrammed operating system Thread is concerned with scheduling and execution, whereas a process is concerned with both scheduling/execution and resource and resource ownership ...
... the same as the concept of software threads in a multiprogrammed operating system Thread is concerned with scheduling and execution, whereas a process is concerned with both scheduling/execution and resource and resource ownership ...