The 27 Year Old Microkernel - foundry27
... > Arguments are a function pointer and a data pointer Remember process manager shares address space with kernel > _NTO_PF_RING0 flag needed to use this kernel call > Only process manager has this flag set ...
... > Arguments are a function pointer and a data pointer Remember process manager shares address space with kernel > _NTO_PF_RING0 flag needed to use this kernel call > Only process manager has this flag set ...
A Study of Real-time Memory Management: Evaluating Operating
... It must be noticed that virtual memory does not come cheap. Special hardware and software is required to implement translation from logical to physical memory addresses, protected-mode operating systems must perform mode switches whenever they allocate or release pages, and memory is allocated in bl ...
... It must be noticed that virtual memory does not come cheap. Special hardware and software is required to implement translation from logical to physical memory addresses, protected-mode operating systems must perform mode switches whenever they allocate or release pages, and memory is allocated in bl ...
Real Time Operating Systems for IEC 61508 Mike Medoff
... identify non-safety critical tasks that do not need to be developed with the same level of rigor in terms of process and on-line diagnostics. This can greatly simplify the effort involved in the certification. Secondly, it allows you to use third party software in non safety critical areas without h ...
... identify non-safety critical tasks that do not need to be developed with the same level of rigor in terms of process and on-line diagnostics. This can greatly simplify the effort involved in the certification. Secondly, it allows you to use third party software in non safety critical areas without h ...
OS - Deyes High School
... Each application will open up in a new windows. This can be dragged, resized or closed by the user. The image to the right shows two windows open with different applications running. The user interface of the OS controls these windows. It will send messages to the applications to inform them of thin ...
... Each application will open up in a new windows. This can be dragged, resized or closed by the user. The image to the right shows two windows open with different applications running. The user interface of the OS controls these windows. It will send messages to the applications to inform them of thin ...
operating system
... of computing as centered in networks rather than in individual computers. Unix systems are characterized by various concepts: the use of plain text for storing data; a hierarchical file system; treating devices and certain types of inter-process communication (IPC) as files. Under Unix, the "ope ...
... of computing as centered in networks rather than in individual computers. Unix systems are characterized by various concepts: the use of plain text for storing data; a hierarchical file system; treating devices and certain types of inter-process communication (IPC) as files. Under Unix, the "ope ...
Lecture notes - 南京大学计算机科学与技术系
... provides transparency support provide heterogeneity support control network in most effective way consists of low level commands + local operating systems + distributed features Inter-process communication (IPC) Distributed Systems ...
... provides transparency support provide heterogeneity support control network in most effective way consists of low level commands + local operating systems + distributed features Inter-process communication (IPC) Distributed Systems ...
linux: a product of the internet
... minicomputers could perform the same functions less expensively. Today workstations, PCs, and Macs have challenged the minis in much the same way, far surpassing even newer minicomputers in cost and performance. Powerful 64-bit processor chips; plentiful, inexpensive memory; and lower-priced hard-d ...
... minicomputers could perform the same functions less expensively. Today workstations, PCs, and Macs have challenged the minis in much the same way, far surpassing even newer minicomputers in cost and performance. Powerful 64-bit processor chips; plentiful, inexpensive memory; and lower-priced hard-d ...
What is an Operating System?
... in memory and on disk (the CPU is allocated to a job only if the job is in memory). ? A job swapped in and out of memory to the disk. ? On-line communication between the user and the system is provided; when the operating system finishes the execution of one command, it seeks the next “control state ...
... in memory and on disk (the CPU is allocated to a job only if the job is in memory). ? A job swapped in and out of memory to the disk. ? On-line communication between the user and the system is provided; when the operating system finishes the execution of one command, it seeks the next “control state ...
OPERATING SYSTEM CONCEPTS
... messages to be turned into packets of information, sent to the network controller, transmitted across a communications medium, and reassembled by the destination system. Packet ordering and data correction must take place. Again, user programs might not coordinate access to the network device, or th ...
... messages to be turned into packets of information, sent to the network controller, transmitted across a communications medium, and reassembled by the destination system. Packet ordering and data correction must take place. Again, user programs might not coordinate access to the network device, or th ...
Operating system (OS)
... Providing the User Interface The user interface is that part of the operating system that enables the user to interact with it. Two types of user interfaces: Command-line– Requires the user to type keywords or commands to enter data or give instructions. Graphical user interface (GUI)– Uses ...
... Providing the User Interface The user interface is that part of the operating system that enables the user to interact with it. Two types of user interfaces: Command-line– Requires the user to type keywords or commands to enter data or give instructions. Graphical user interface (GUI)– Uses ...
No Slide Title
... hardware supports virtual to physical mapping a paging mechanism, transparent cache coherence on multiprocessor systems, and virtual addressing aliasing The VM manager in 2000 uses a page-based management ...
... hardware supports virtual to physical mapping a paging mechanism, transparent cache coherence on multiprocessor systems, and virtual addressing aliasing The VM manager in 2000 uses a page-based management ...
File System
... hardware supports virtual to physical mapping a paging mechanism, transparent cache coherence on multiprocessor systems, and virtual addressing aliasing The VM manager in 2000 uses a page-based management ...
... hardware supports virtual to physical mapping a paging mechanism, transparent cache coherence on multiprocessor systems, and virtual addressing aliasing The VM manager in 2000 uses a page-based management ...
COMP25111: Operating Systems - Lecture 4: Operating System
... How do Apps use protected resources? System call: interface between Apps & OS like method/function call – parameters, caller waits for result via “gatekeeper” mechanism (H/W + OS) – turns on System mode – calls OS routine from list – parameters etc. checked – action performed – returns to User mode ...
... How do Apps use protected resources? System call: interface between Apps & OS like method/function call – parameters, caller waits for result via “gatekeeper” mechanism (H/W + OS) – turns on System mode – calls OS routine from list – parameters etc. checked – action performed – returns to User mode ...
Computer Science - Rainhill High School
... Be able to identify positive and negative features of two or more operating systems Be able to compare the strengths and weaknesses of different operating systems, choosing which is most suitable for a given scenario ...
... Be able to identify positive and negative features of two or more operating systems Be able to compare the strengths and weaknesses of different operating systems, choosing which is most suitable for a given scenario ...
Getting Started with Real Time Operating Systems (RTOS)
... MMU because, not supporting VM would amount to a waste of the MMU, while supporting it would have the downside of non-determinism. VxWorks has dealt with this issue by providing virtual memory as an optional add-on to the core RTOS. ...
... MMU because, not supporting VM would amount to a waste of the MMU, while supporting it would have the downside of non-determinism. VxWorks has dealt with this issue by providing virtual memory as an optional add-on to the core RTOS. ...
How do Users and Processes interact with the Operating System
... Typically written in a high-level language (C or C++) Mostly accessed by programs via a high-level Application Program Interface (API) rather than direct system call. Three most common APIs are Win32 API for Windows, POSIX API for UNIX-based systems (including virtually all versions of UNIX, Linux, ...
... Typically written in a high-level language (C or C++) Mostly accessed by programs via a high-level Application Program Interface (API) rather than direct system call. Three most common APIs are Win32 API for Windows, POSIX API for UNIX-based systems (including virtually all versions of UNIX, Linux, ...
Towards Protecting Sensitive Files in a Compromised System
... source VM identity, SVFS server verifies compliance of sensitive file access requests with security policies accordingly. Only valid requests will be served. The advantage of developing a new file system to store sensitive files and putting the policy enforcer in DVM instead of VMM is that the secur ...
... source VM identity, SVFS server verifies compliance of sensitive file access requests with security policies accordingly. Only valid requests will be served. The advantage of developing a new file system to store sensitive files and putting the policy enforcer in DVM instead of VMM is that the secur ...
An Overview of Fault Tolerance Techniques for Real
... is one of the most important roles of RTOSs. But, there are some differences between these two kinds of OS in managing processes because of timing constraints in RTOSs. Timesharing OSs do their best effort to activate and release tasks timely. But in contrast, RTOSs should activate a process once an ...
... is one of the most important roles of RTOSs. But, there are some differences between these two kinds of OS in managing processes because of timing constraints in RTOSs. Timesharing OSs do their best effort to activate and release tasks timely. But in contrast, RTOSs should activate a process once an ...
![[slides] Case study: Windows](http://s1.studyres.com/store/data/008424774_1-87b89c613bf8233f6d9038041cfe401c-300x300.png)
[slides] Case study: Windows
... existing one, by receiving a duplicated handle from another process, or by inheriting a handle from its parent process. Each object is protected by an access control list. The executive name space is extensible to allow naming of files, ...
... existing one, by receiving a duplicated handle from another process, or by inheriting a handle from its parent process. Each object is protected by an access control list. The executive name space is extensible to allow naming of files, ...
I/O and Storage Management
... A read can be serviced by either of the two disks which contains the requested data (improved performance over RAID 0 if reads dominate) A write request must be done on both disks but can be done in parallel Recovery is simple but cost is high ...
... A read can be serviced by either of the two disks which contains the requested data (improved performance over RAID 0 if reads dominate) A write request must be done on both disks but can be done in parallel Recovery is simple but cost is high ...
High Performance Computing Prof. Matthew Jacob Department of Computer Science and Automation
... course,, they could be copies of older Linux kernels, but there is one most recent version of Linux, which would be the current Linux kernel and one could get it in any one of the distributions that are listed here. Now, there are others as well. It is the world is not just Unix and Linux. For examp ...
... course,, they could be copies of older Linux kernels, but there is one most recent version of Linux, which would be the current Linux kernel and one could get it in any one of the distributions that are listed here. Now, there are others as well. It is the world is not just Unix and Linux. For examp ...
Chap3
... • Resource allocation – allocating resources to multiple users or multiple jobs running at the same time. • Accounting – keep track of and record which users use how much and what kinds of computer resources for account billing or for accumulating usage statistics. • Protection – ensuring that all a ...
... • Resource allocation – allocating resources to multiple users or multiple jobs running at the same time. • Accounting – keep track of and record which users use how much and what kinds of computer resources for account billing or for accumulating usage statistics. • Protection – ensuring that all a ...
ch16
... existing one, by receiving a duplicated handle from another process, or by inheriting a handle from its parent process. Each object is protected by an access control list. The executive name space is extensible to allow naming of files, ...
... existing one, by receiving a duplicated handle from another process, or by inheriting a handle from its parent process. Each object is protected by an access control list. The executive name space is extensible to allow naming of files, ...