The document provides an introduction to operating systems and real-time operating systems (RTOS). It defines an operating system as software that manages computer resources and provides common services for programs. An RTOS is designed for systems where response time is critical. The document discusses the components, features and types of both operating systems and RTOS, including examples like VxWorks and QNX.
The document discusses real-time operating systems (RTOS), which are variants of operating systems designed to operate in constrained environments with limited memory and processing power, and often need to provide services within a defined time period. It describes the key components of an RTOS, including the kernel, tasks, memory management, timers, I/O, inter-process communication (IPC), and device drivers. It also outlines some expectations of RTOS like being deadline-driven and able to operate with limited resources.
This presentation talks about Real Time Operating Systems (RTOS). Starting with fundamental concepts of OS, this presentation deep dives into Embedded, Real Time and related aspects of an OS. Appropriate examples are referred with Linux as a case-study. Ideal for a beginner to build understanding about RTOS.
An RTOS differs from a common OS in that it allows direct access to the microprocessor and peripherals, helping to meet deadlines. An RTOS provides mechanisms for multitasking like scheduling, context switching, and IPC. It uses techniques like priority-based preemptive scheduling and memory management with separate stacks and heaps for tasks. Common RTOS services include timing functions, synchronization, resource protection and communication between processes.
Real time Scheduling in Operating System for Msc CSThanveen
This document discusses real-time scheduling and algorithms. It defines real-time systems as systems where correctness depends on both functional and temporal aspects. Key aspects of real-time scheduling include determinism, responsiveness, reliability and meeting deadlines. Common real-time scheduling algorithms discussed include rate monotonic scheduling, earliest deadline first, and dynamic scheduling approaches. The document also covers priority inversion which can occur when higher priority tasks must wait for lower priority tasks in preemptive multitasking systems.
The document provides information about real-time systems and real-time operating systems (RTOS). It defines a real-time system as one where the correctness depends not only on logical results but also the time when results are delivered. An RTOS is designed to meet the strict timing constraints of real-time applications through features like multitasking, interrupt handling, and predictable scheduling. Key considerations for selecting an RTOS include its real-time capabilities, footprint, interrupt latencies, available APIs, and development tools.
This document provides an overview of real-time operating systems (RTOS), including their key characteristics, scheduling approaches, and commercial examples. RTOS are used in applications that require tasks to complete work and deliver services on time. They use priority-based and clock-driven scheduling algorithms like rate monotonic analysis and earliest deadline first to ensure real-time constraints are met. Commercial RTOS aim to provide features like priority levels, fast task preemption, and predictable interrupt handling for real-time applications.
Real-time systems are those systems in which the correctness of the system depends not only on the logical result of computation, but also on the time at which the results are produced.
This document discusses real-time operating systems (RTOS). It begins by defining an RTOS and distinguishing it from traditional operating systems by its ability to respond to external events in a timely manner. It describes the different types of RTOS based on timing constraints. It then covers key RTOS concepts like preemptive priority scheduling, multitasking, inter-task communication, priority inheritance, and memory management. The document also discusses the Nucleus RTOS and whether RTOS will replace traditional operating systems.
The document discusses real-time operating systems (RTOS), which are variants of operating systems designed to operate in constrained environments with limited memory and processing power, and often need to provide services within a defined time period. It describes the key components of an RTOS, including the kernel, tasks, memory management, timers, I/O, inter-process communication (IPC), and device drivers. It also outlines some expectations of RTOS like being deadline-driven and able to operate with limited resources.
This presentation talks about Real Time Operating Systems (RTOS). Starting with fundamental concepts of OS, this presentation deep dives into Embedded, Real Time and related aspects of an OS. Appropriate examples are referred with Linux as a case-study. Ideal for a beginner to build understanding about RTOS.
An RTOS differs from a common OS in that it allows direct access to the microprocessor and peripherals, helping to meet deadlines. An RTOS provides mechanisms for multitasking like scheduling, context switching, and IPC. It uses techniques like priority-based preemptive scheduling and memory management with separate stacks and heaps for tasks. Common RTOS services include timing functions, synchronization, resource protection and communication between processes.
Real time Scheduling in Operating System for Msc CSThanveen
This document discusses real-time scheduling and algorithms. It defines real-time systems as systems where correctness depends on both functional and temporal aspects. Key aspects of real-time scheduling include determinism, responsiveness, reliability and meeting deadlines. Common real-time scheduling algorithms discussed include rate monotonic scheduling, earliest deadline first, and dynamic scheduling approaches. The document also covers priority inversion which can occur when higher priority tasks must wait for lower priority tasks in preemptive multitasking systems.
The document provides information about real-time systems and real-time operating systems (RTOS). It defines a real-time system as one where the correctness depends not only on logical results but also the time when results are delivered. An RTOS is designed to meet the strict timing constraints of real-time applications through features like multitasking, interrupt handling, and predictable scheduling. Key considerations for selecting an RTOS include its real-time capabilities, footprint, interrupt latencies, available APIs, and development tools.
This document provides an overview of real-time operating systems (RTOS), including their key characteristics, scheduling approaches, and commercial examples. RTOS are used in applications that require tasks to complete work and deliver services on time. They use priority-based and clock-driven scheduling algorithms like rate monotonic analysis and earliest deadline first to ensure real-time constraints are met. Commercial RTOS aim to provide features like priority levels, fast task preemption, and predictable interrupt handling for real-time applications.
Real-time systems are those systems in which the correctness of the system depends not only on the logical result of computation, but also on the time at which the results are produced.
This document discusses real-time operating systems (RTOS). It begins by defining an RTOS and distinguishing it from traditional operating systems by its ability to respond to external events in a timely manner. It describes the different types of RTOS based on timing constraints. It then covers key RTOS concepts like preemptive priority scheduling, multitasking, inter-task communication, priority inheritance, and memory management. The document also discusses the Nucleus RTOS and whether RTOS will replace traditional operating systems.
This document discusses real-time operating systems (RTOS). It defines RTOS as operating systems that are able to respond to inputs immediately within a specified time delay. It compares RTOS to general operating systems and discusses the types, characteristics, functions, and applications of RTOS. Examples of RTOS like VxWorks are provided. The key functions of an RTOS include task management, scheduling, resource allocation, and interrupt handling. RTOS are widely used in applications that require deterministic responses like avionics, medical devices, industrial automation, and more.
This document discusses real-time operating systems (RTOS). It defines an RTOS as a program that schedules execution in a timely manner, manages system resources, and provides a consistent foundation for developing application code. The key components of an RTOS include a scheduler, objects like tasks and semaphores, and services like interrupt management. The scheduler uses algorithms to determine which task executes when and includes important elements like context switching. Objects help with synchronization between tasks. Services perform operations on objects and other kernel functions.
Real-time operating systems are designed to handle tasks with strict timing constraints. They manage computer hardware resources and provide services to real-time computer programs. Real-time tasks must be completed by their deadlines to maintain the correct functionality of systems like digital controls that periodically sense status and actuate systems. Real-time operating systems prioritize predictability and ensuring tasks meet timing deadlines over average performance metrics. They schedule processors and allocate memory in a way that guarantees tasks will finish processing by their required times.
The Scheduler.
What if two tasks have the same priority are ready?
Task object data.
System tasks.
Hello World application using RTOS.
References and Read more
Sara Afshar: Scheduling and Resource Sharing in Multiprocessor Real-Time Systemsknowdiff
PhD Candidate,
Department of Computer science
Mälardalen University
Time: Tuesday, Dec. 30, 2014, 11:30 a.m.
Location: Computer Engineering Department, Urmia University
Abstract:
The processor is the brain of a computer system. Usually, one or more programs run on a processor where each program is typically responsible for performing a particular task or function of the system. The performance of all the tasks together results in the system functionality. In many computer systems, it is not only enough that all tasks deliver correct output, but it is also crucial that these activities are delivered in a proper time. This type of systems that have timing requirements are known as real-time systems. A scheduler is responsible for scheduling all tasks on the processor, i.e., it dictates which task to run and when to run to ensure that all tasks are carried out on time. Typically, such tasks/programs need to use the computer system’s hardware and software resources to perform their calculation. Examples of such type of resources that are shared among programs are I/O devices, buffers and memories. Technology that is used for the management of shared resources is known as resource sharing synchronization protocol.
In recent years, a shift from single-processor platforms to multiprocessor platforms has become inevitable due to availability of processor chips and requirements on increased performance. Scheduling and resource sharing protocols have been well studied for uniprocessor systems. However, in the context of multiprocessors, still such techniques are not fully mature. The shift towards multi-core technology has revealed the demand for real-time scheduling algorithms along with synchronization protocols to support real-time applications on multiprocessors, both with and without dependencies.
In this talk, we first have an introduction to real-time embedded systems. Next, we look at scheduling and resource sharing policies in uniprocessor platforms. Further, we discuss the extension of scheduling and resource sharing policies for multiprocessor platforms and present the recent challenges arisen in this context.
Biography:
Sara Afshar is a PhD student at Mälardalen University. She has received her B.Sc. degree in Electrical Engineering from Tabriz University, Iran in 2002. She worked at different engineering companies until 2009. In the year 2010 she started her M.Sc. in Embedded Systems at Mälardalen University. She obtained her Master degree in 2012 and at the same year she started her PhD studies in Mälardalen University. Currently she is working on the topic of resource sharing in multiprocessor systems. She is part of the Complex Real-Time Embedded Systems group at Mälardalen University.
This document provides an overview of the CS4109 Computer System Architecture course taught by Prof. K.Sridhar Patnaik at BIT Mesra, Ranchi. The course objectives are to learn how computers work, analyze performance, and understand computer design and modern processor issues. The knowledge is useful for tasks like designing computers, improving software performance, and providing embedded solutions. Key topics covered include performance, instruction set architecture, arithmetic logic units, processor construction, pipelining, memory systems, and input/output. The document also discusses computer organization versus architecture, Turing machines as a model of computation, and the Church-Turing thesis.
This document provides an overview of processes and operating systems. It discusses key concepts like processes, multitasking, multiprocessing, and multithreading. It also covers scheduling algorithms like round robin, priority scheduling, and rate monotonic scheduling. Real-time operating systems prioritize tasks based on timing constraints to ensure deadlines are met. Preemption and priorities are important methods for scheduling in real-time systems.
This document discusses real-time systems and real-time operating systems (RTOS). It begins by defining real-time systems as systems where the correctness depends on both the logical result of computation and the time at which results are produced. It then describes two types of real-time systems - those with hard deadlines and soft deadlines. The document uses the example of a car's controlling system to illustrate a sample real-time system and its components. It also discusses key functions of an RTOS like task management and scheduling, inter-task communication and synchronization, and dynamic memory allocation. Finally, it analyzes approaches to using Linux as an RTOS and their advantages and disadvantages.
Task Context.
Context Switching between tasks.
Shared Data Problem.
Non Reentrant Function.
Reentrant Function.
Gray area of reentrancy.
How to protect Shared Data?
This document discusses real-time operating system (RTOS) concepts. It defines real-time as responsiveness defined by external processes. An RTOS guarantees tasks will finish within time constraints. It explains characteristics like preemptive multitasking, prioritized processes, interrupt handling. The document also covers RTOS scheduling, dispatching, time specifications for tasks and interrupts. Common real-time applications are also listed like military, telecommunications, aviation and more.
1. Real-time systems are systems where the correctness depends on both the logical result and the time at which the results are produced.
2. Real-time systems have performance deadlines where computations and actions must be completed. Deadlines can be time-driven or event-driven.
3. Real-time systems are classified as hard, firm, or soft depending on how critical meeting deadlines are. They are used in applications like medical equipment, automotive systems, and avionics.
The document discusses real-time operating systems (RTOS). It defines an RTOS as an operating system intended for real-time applications that must respond to events within strict time constraints. An RTOS has two main components - the "real-time" aspect which ensures responses within deadlines, and the "operating system" aspect which manages hardware resources and allows for multitasking. Common features of RTOSes include task scheduling, synchronization between tasks, and communication between tasks. The document outlines several RTOS concepts such as task management, scheduling, and inter-task communication methods like semaphores.
presentation on real time operating system(RTOS's)chetan mudenoor
Real time Operating Systems are very fast and quick respondent systems. These systems are used in an environment where a large number of events (generally external) must be accepted and processed in a short time.
RTLinux is a real-time operating system that allows real-time applications to run on top of Linux. It modifies the Linux kernel to add a virtual machine layer with a separate task scheduler that prioritizes real-time tasks over standard Linux processes. This enables RTLinux to support hard real-time deadlines. Programming in RTLinux involves creating modules that can be loaded and unloaded from the kernel using specific commands. Real-time threads and synchronization objects like mutexes are implemented using POSIX interfaces.
This document discusses operating system structures and components. It describes four main OS designs: monolithic systems, layered systems, virtual machines, and client-server models. For each design, it provides details on how the system is organized and which components are responsible for which tasks. It also discusses some advantages and disadvantages of the different approaches. The document concludes by explaining how client-server models address issues with distributing OS functions to user space by having some critical servers run in the kernel while still communicating with user processes.
An operating system is software that manages computer resources and provides services to application programs. It sits between the computer hardware and application software. There are three main types of operating systems: stand-alone, network, and embedded. Real-time operating systems (RTOS) are designed for applications with time-critical deadlines like process control. Key features of an RTOS include short and predictable context switching, interrupt handling times, and inter-process communication. Popular RTOS include VxWorks, QNX, and RTLinux.
This document discusses various topics related to embedded computing platform design including:
1. It outlines the syllabus which covers topics like CPU buses, memory systems, embedded development platforms, consumer electronics architecture, performance analysis, and program optimization.
2. It provides examples of embedded platforms like Raspberry Pi and BeagleBoard and discusses factors to consider when choosing a platform.
3. It describes techniques for debugging programs on embedded hardware including using USB tools, breakpoints, LEDs, in-circuit emulation, and logic analyzers.
4. It discusses analyzing and optimizing program performance at both the platform and code level through techniques like measuring execution times, understanding cache and pipeline effects, and optimizing loops
The document discusses clock-driven scheduling for real-time systems. It covers key concepts like static schedules, cyclic executives, frame size constraints, job slicing, and algorithms for constructing static schedules. Notations are introduced to represent periodic tasks, and assumptions made for clock-driven scheduling are explained. Methods to improve the average response time of aperiodic jobs through slack stealing are also summarized.
This document provides an introduction to operating systems and real-time operating systems (RTOS). It begins with an invocation poem by Rabindranath Tagore, then defines what an operating system is, including its role in managing computer resources and providing an interface for users. The document discusses the evolution of operating systems over different generations and the basic requirements of OS like usability, adaptability, and cost. It also outlines the components of operating systems like the kernel, process scheduler, and memory manager. Finally, the document defines what a real-time system is and compares different types like hard, firm, and soft real-time systems. It lists common components and features of RTOSs and provides examples of commercial RTOSs
This document discusses real-time operating systems for embedded systems. It defines embedded systems and real-time constraints. It describes the components of an RTOS including task management, inter-task communication, dynamic memory allocation, timers, and device I/O. It discusses when an RTOS is necessary compared to a general purpose OS and provides examples of common RTOSes.
This document discusses real-time operating systems (RTOS). It defines RTOS as operating systems that are able to respond to inputs immediately within a specified time delay. It compares RTOS to general operating systems and discusses the types, characteristics, functions, and applications of RTOS. Examples of RTOS like VxWorks are provided. The key functions of an RTOS include task management, scheduling, resource allocation, and interrupt handling. RTOS are widely used in applications that require deterministic responses like avionics, medical devices, industrial automation, and more.
This document discusses real-time operating systems (RTOS). It defines an RTOS as a program that schedules execution in a timely manner, manages system resources, and provides a consistent foundation for developing application code. The key components of an RTOS include a scheduler, objects like tasks and semaphores, and services like interrupt management. The scheduler uses algorithms to determine which task executes when and includes important elements like context switching. Objects help with synchronization between tasks. Services perform operations on objects and other kernel functions.
Real-time operating systems are designed to handle tasks with strict timing constraints. They manage computer hardware resources and provide services to real-time computer programs. Real-time tasks must be completed by their deadlines to maintain the correct functionality of systems like digital controls that periodically sense status and actuate systems. Real-time operating systems prioritize predictability and ensuring tasks meet timing deadlines over average performance metrics. They schedule processors and allocate memory in a way that guarantees tasks will finish processing by their required times.
The Scheduler.
What if two tasks have the same priority are ready?
Task object data.
System tasks.
Hello World application using RTOS.
References and Read more
Sara Afshar: Scheduling and Resource Sharing in Multiprocessor Real-Time Systemsknowdiff
PhD Candidate,
Department of Computer science
Mälardalen University
Time: Tuesday, Dec. 30, 2014, 11:30 a.m.
Location: Computer Engineering Department, Urmia University
Abstract:
The processor is the brain of a computer system. Usually, one or more programs run on a processor where each program is typically responsible for performing a particular task or function of the system. The performance of all the tasks together results in the system functionality. In many computer systems, it is not only enough that all tasks deliver correct output, but it is also crucial that these activities are delivered in a proper time. This type of systems that have timing requirements are known as real-time systems. A scheduler is responsible for scheduling all tasks on the processor, i.e., it dictates which task to run and when to run to ensure that all tasks are carried out on time. Typically, such tasks/programs need to use the computer system’s hardware and software resources to perform their calculation. Examples of such type of resources that are shared among programs are I/O devices, buffers and memories. Technology that is used for the management of shared resources is known as resource sharing synchronization protocol.
In recent years, a shift from single-processor platforms to multiprocessor platforms has become inevitable due to availability of processor chips and requirements on increased performance. Scheduling and resource sharing protocols have been well studied for uniprocessor systems. However, in the context of multiprocessors, still such techniques are not fully mature. The shift towards multi-core technology has revealed the demand for real-time scheduling algorithms along with synchronization protocols to support real-time applications on multiprocessors, both with and without dependencies.
In this talk, we first have an introduction to real-time embedded systems. Next, we look at scheduling and resource sharing policies in uniprocessor platforms. Further, we discuss the extension of scheduling and resource sharing policies for multiprocessor platforms and present the recent challenges arisen in this context.
Biography:
Sara Afshar is a PhD student at Mälardalen University. She has received her B.Sc. degree in Electrical Engineering from Tabriz University, Iran in 2002. She worked at different engineering companies until 2009. In the year 2010 she started her M.Sc. in Embedded Systems at Mälardalen University. She obtained her Master degree in 2012 and at the same year she started her PhD studies in Mälardalen University. Currently she is working on the topic of resource sharing in multiprocessor systems. She is part of the Complex Real-Time Embedded Systems group at Mälardalen University.
This document provides an overview of the CS4109 Computer System Architecture course taught by Prof. K.Sridhar Patnaik at BIT Mesra, Ranchi. The course objectives are to learn how computers work, analyze performance, and understand computer design and modern processor issues. The knowledge is useful for tasks like designing computers, improving software performance, and providing embedded solutions. Key topics covered include performance, instruction set architecture, arithmetic logic units, processor construction, pipelining, memory systems, and input/output. The document also discusses computer organization versus architecture, Turing machines as a model of computation, and the Church-Turing thesis.
This document provides an overview of processes and operating systems. It discusses key concepts like processes, multitasking, multiprocessing, and multithreading. It also covers scheduling algorithms like round robin, priority scheduling, and rate monotonic scheduling. Real-time operating systems prioritize tasks based on timing constraints to ensure deadlines are met. Preemption and priorities are important methods for scheduling in real-time systems.
This document discusses real-time systems and real-time operating systems (RTOS). It begins by defining real-time systems as systems where the correctness depends on both the logical result of computation and the time at which results are produced. It then describes two types of real-time systems - those with hard deadlines and soft deadlines. The document uses the example of a car's controlling system to illustrate a sample real-time system and its components. It also discusses key functions of an RTOS like task management and scheduling, inter-task communication and synchronization, and dynamic memory allocation. Finally, it analyzes approaches to using Linux as an RTOS and their advantages and disadvantages.
Task Context.
Context Switching between tasks.
Shared Data Problem.
Non Reentrant Function.
Reentrant Function.
Gray area of reentrancy.
How to protect Shared Data?
This document discusses real-time operating system (RTOS) concepts. It defines real-time as responsiveness defined by external processes. An RTOS guarantees tasks will finish within time constraints. It explains characteristics like preemptive multitasking, prioritized processes, interrupt handling. The document also covers RTOS scheduling, dispatching, time specifications for tasks and interrupts. Common real-time applications are also listed like military, telecommunications, aviation and more.
1. Real-time systems are systems where the correctness depends on both the logical result and the time at which the results are produced.
2. Real-time systems have performance deadlines where computations and actions must be completed. Deadlines can be time-driven or event-driven.
3. Real-time systems are classified as hard, firm, or soft depending on how critical meeting deadlines are. They are used in applications like medical equipment, automotive systems, and avionics.
The document discusses real-time operating systems (RTOS). It defines an RTOS as an operating system intended for real-time applications that must respond to events within strict time constraints. An RTOS has two main components - the "real-time" aspect which ensures responses within deadlines, and the "operating system" aspect which manages hardware resources and allows for multitasking. Common features of RTOSes include task scheduling, synchronization between tasks, and communication between tasks. The document outlines several RTOS concepts such as task management, scheduling, and inter-task communication methods like semaphores.
presentation on real time operating system(RTOS's)chetan mudenoor
Real time Operating Systems are very fast and quick respondent systems. These systems are used in an environment where a large number of events (generally external) must be accepted and processed in a short time.
RTLinux is a real-time operating system that allows real-time applications to run on top of Linux. It modifies the Linux kernel to add a virtual machine layer with a separate task scheduler that prioritizes real-time tasks over standard Linux processes. This enables RTLinux to support hard real-time deadlines. Programming in RTLinux involves creating modules that can be loaded and unloaded from the kernel using specific commands. Real-time threads and synchronization objects like mutexes are implemented using POSIX interfaces.
This document discusses operating system structures and components. It describes four main OS designs: monolithic systems, layered systems, virtual machines, and client-server models. For each design, it provides details on how the system is organized and which components are responsible for which tasks. It also discusses some advantages and disadvantages of the different approaches. The document concludes by explaining how client-server models address issues with distributing OS functions to user space by having some critical servers run in the kernel while still communicating with user processes.
An operating system is software that manages computer resources and provides services to application programs. It sits between the computer hardware and application software. There are three main types of operating systems: stand-alone, network, and embedded. Real-time operating systems (RTOS) are designed for applications with time-critical deadlines like process control. Key features of an RTOS include short and predictable context switching, interrupt handling times, and inter-process communication. Popular RTOS include VxWorks, QNX, and RTLinux.
This document discusses various topics related to embedded computing platform design including:
1. It outlines the syllabus which covers topics like CPU buses, memory systems, embedded development platforms, consumer electronics architecture, performance analysis, and program optimization.
2. It provides examples of embedded platforms like Raspberry Pi and BeagleBoard and discusses factors to consider when choosing a platform.
3. It describes techniques for debugging programs on embedded hardware including using USB tools, breakpoints, LEDs, in-circuit emulation, and logic analyzers.
4. It discusses analyzing and optimizing program performance at both the platform and code level through techniques like measuring execution times, understanding cache and pipeline effects, and optimizing loops
The document discusses clock-driven scheduling for real-time systems. It covers key concepts like static schedules, cyclic executives, frame size constraints, job slicing, and algorithms for constructing static schedules. Notations are introduced to represent periodic tasks, and assumptions made for clock-driven scheduling are explained. Methods to improve the average response time of aperiodic jobs through slack stealing are also summarized.
This document provides an introduction to operating systems and real-time operating systems (RTOS). It begins with an invocation poem by Rabindranath Tagore, then defines what an operating system is, including its role in managing computer resources and providing an interface for users. The document discusses the evolution of operating systems over different generations and the basic requirements of OS like usability, adaptability, and cost. It also outlines the components of operating systems like the kernel, process scheduler, and memory manager. Finally, the document defines what a real-time system is and compares different types like hard, firm, and soft real-time systems. It lists common components and features of RTOSs and provides examples of commercial RTOSs
This document discusses real-time operating systems for embedded systems. It defines embedded systems and real-time constraints. It describes the components of an RTOS including task management, inter-task communication, dynamic memory allocation, timers, and device I/O. It discusses when an RTOS is necessary compared to a general purpose OS and provides examples of common RTOSes.
The document provides an overview of operating systems and some of their key concepts. It discusses why operating systems are needed, defining them as programs that act as intermediaries between users and computer hardware. It describes the four main components of a computer system - hardware, operating system, application programs, and users. Finally, it outlines some of the main functions and goals of operating systems, such as executing user programs efficiently and making the computer system convenient to use.
This document discusses real-time operating systems for embedded systems. It begins by defining embedded systems as specialized computer systems designed to perform dedicated functions with real-time constraints. It then explains that real-time embedded systems must manage time-critical processes. Common real-time operating system (RTOS) functions include task management, inter-task communication, dynamic memory allocation, timers, and device I/O. RTOSs allow embedded systems to schedule tasks, communicate between processes, and interface with hardware in a timely manner. Examples of widely-used RTOSes are given.
The document defines and categorizes different types of software. It discusses system software, including operating systems and utility software. It explains that operating systems control hardware, provide interfaces, manage memory and tasks. It also defines application software, including personal, workgroup, and enterprise-level applications. Overall, the document provides a comprehensive overview of the main categories and functions of different software types.
The document defines and categorizes different types of software. It discusses system software, including operating systems and utility software. It explains that operating systems control hardware, provide interfaces, manage memory and tasks. It also defines application software, including personal, workgroup, and enterprise-level applications. Overall, the document provides a comprehensive overview of the main categories and functions of different software types.
C language computer introduction to the computer hardwareNIKHIL KRISHNA
This document provides an overview of computer hardware, software, organization and concepts. It defines a computer as a device that performs computations and logical decisions by processing data under instruction sets. Key components include the central processing unit (CPU), memory, storage, input/output devices, and software like operating systems and applications. Fundamental concepts discussed include Moore's Law, which predicts an exponential increase in component density, Von Neumann architecture, and how memory is organized into addressable cells.
This document provides an overview of computer hardware, software, organization and concepts. It discusses that a computer is a device that can perform computations and logical decisions by processing data under instruction from computer programs. It then describes the typical hardware components of a computer and trends in increasing memory and processor speeds over time according to Moore's Law. The document also summarizes computer software including operating systems and applications, and explains the typical organization of a computer including input/output, memory, arithmetic logic unit, control unit and secondary storage.
This document provides an overview of computer hardware, software, organization and concepts. It defines a computer as a device that performs computations and logical decisions by processing data under instruction sets. Key components include the central processing unit (CPU), memory, storage, input/output devices, and software like operating systems and applications. Fundamental concepts discussed include Moore's Law, which predicts an exponential increase in component density, Von Neumann architecture, and how memory is organized into addressable cells.
An operating system acts as an interface between hardware and users, providing abstractions to simplify application design. It performs core functions like process and resource management, protection between processes, and communication between processes. Operating systems have evolved over several phases as hardware has become cheaper and more powerful, moving from single-user batch processing systems to time-sharing systems to personal computing systems and now distributed and cloud-based systems.
Operating system basics, Types of operating systems, Tasks, Process and Thre...SattiBabu16
REAL TIME OPERATING SYSTEM: Operating system basics, Types of operating
systems, Tasks, Process and Threads, Multiprocessing and Multitasking, Task Scheduling,
Threads, Processes and Scheduling, Task communication, Task synchronization
The document discusses different types of operating systems. It explains that an operating system manages hardware and software resources on a device and provides a consistent interface for applications. Not all devices need complex operating systems; simple devices like microwaves run single hardcoded programs. However, most computers use general purpose operating systems that can be adapted for different hardware over time. The document outlines several categories of operating systems including those for desktops, real-time applications, single-user vs. multi-user, and networking.
STORAGE DEVICES & OPERATING SYSTEM SERVICESAyesha Tahir
The document discusses storage devices and operating system services. It describes the hierarchy of storage devices from main memory to secondary storage like magnetic disks, optical discs, and magnetic tape. It then discusses common operating system services like process management, resource management, security, memory management, and file management. It also covers embedded operating systems, real-time operating systems, monolithic kernels, and batch operating systems.
An operating system controls computer resources and provides a platform for applications. It sits between hardware like the CPU, memory, and I/O devices, and software like compilers, databases, and word processors. There are three main types of operating systems: stand-alone systems for desktops, network systems for servers, and embedded systems found in devices. A real-time operating system (RTOS) is designed for applications with time-critical deadlines like process and thread execution times. An RTOS has features like short and predictable context switching, interrupt handling times, and inter-process communication mechanisms. Popular RTOSs include LynxOS, QNX, RTLinux, and VxWorks.
This document discusses real-time operating systems (RTOs) and their use in embedded systems. It begins by defining an RTOS as an operating system designed to support real-time applications where the timeliness of result delivery is critical. It notes that RTOs have predictable behavior under unpredictable external events. The document then discusses characteristics of RTOs such as small memory footprint, determinism, and guaranteed worst-case interrupt latency and context switch times. It also covers the files generated during cross-compilation of code for an embedded system, such as listing files, hex files, map files, and object files.
This document discusses IT infrastructure, including hardware, software, networks, and data management technology. It covers the types and sizes of computers from personal computers to supercomputers. It also discusses operating systems, application software, groupware, and contemporary trends like edge computing, virtual machines, and cloud computing. The document examines different types of networks including client-server, web servers, and storage area networks. It provides an overview of strategic decision making around managing infrastructure technology.
The document provides an overview of operating system concepts and functions. It discusses that an operating system manages computer hardware resources and provides common services for computer programs. It then describes some key functions of an operating system including memory management, processor management, device management, file management, and other services like security and error detection. The document also covers different types of operating systems such as batch, time-sharing, distributed, network, and real-time operating systems.
MYSQL DATABASE Operating System Part2 (1).pptxArjayBalberan1
The document provides an overview of different types of operating systems:
- Early computers used batch processing systems where users submitted jobs offline via punch cards and the computer processed them in batches.
- Multiprogramming systems allowed multiple programs to run simultaneously by quickly switching between them, improving resource usage compared to batch systems.
- Time-sharing systems further extended this by allowing many users to access a single computer simultaneously through rapid switching between terminals.
- Distributed systems connect multiple autonomous computers to work together and share workload, with examples including client-server, peer-to-peer, and middleware architectures.
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2. Prologue …
A computer is a complex system with many
resources like CPU, I/O devices, disk, memory
etc… For any common user it is always a
confusion about the using of the resources
effectively. Because, unless otherwise the system
is user-friendly, the user cannot use the
computers effectively.
3. So we always require a system software which
can take care of all the hardware complexities
and shoulder the responsibility of resource
allocation such that the user can work with the
computer more effectively. This was realised by
the people very long back and they tried to
develop a software to shield the programmers
from the complexity of the hardware.
4. The result is, a layer of software on the top of
the hardware, to manage all parts of the
system and present the user with an interface
or “Virtual machine” that is easier to
understand the program. This layer of the
software has become our so-called
OPERATING SYSTEM.
5. Now Lets answer the questionNow Lets answer the question
What is an Operating System?What is an Operating System?
6. A more formal definition!A more formal definition!
OS is “A collection of software modules to
assist programmers in enhancing the system
efficiency , flexibility and robustness.
Or
“Operating system is a piece of software
which controls all the computer’s resources
and provides the base upon which the
application programs can be written”
7. From the user point of view
OS is “ An extended machine (virtual)”
and
From the systems view point
“It is a resource manager”.
8. So,Where your OS sits in your System?So,Where your OS sits in your System?
compilers
databases
word
processors
CPU
memory
I/O devices
9. Evolution of OSEvolution of OS
Actually Prof.E.W.Dijsktra is considered as theActually Prof.E.W.Dijsktra is considered as the
father offather of Operating system.Operating system.
10. OS ComponentsOS Components
Kernel: Core components of the OSKernel: Core components of the OS
Process scheduler :Process scheduler :
Determines when and for long each process executesDetermines when and for long each process executes
Memory manager :Memory manager :
Determines when and how memory is allocated to processesDetermines when and how memory is allocated to processes
Decides what to do when main memory is fullDecides what to do when main memory is full
File system :File system :
Organizes named collections of data in persistent storageOrganizes named collections of data in persistent storage
Networking :Networking :
Enables processes to communicate with one anotherEnables processes to communicate with one another
11. The primary functions of anThe primary functions of an
operating systemoperating system
Multiplexing the processor(s)Multiplexing the processor(s)
Scheduling the processesScheduling the processes
Coordinating interaction among processes,interprocessCoordinating interaction among processes,interprocess
communication and Synchronization.communication and Synchronization.
Managing the system resources(I/O,memory,data files)Managing the system resources(I/O,memory,data files)
Enforcing acess control and protectionEnforcing acess control and protection
Maintaining the system integrity and performing errorMaintaining the system integrity and performing error
recoveryrecovery
Providing an interface to the usersProviding an interface to the users
12. TYPES OF OPERATING SYSTEMSTYPES OF OPERATING SYSTEMS
There are three types of Operating systems basedThere are three types of Operating systems based
on their applicationon their application
• Stand-Alone Operating systemStand-Alone Operating system
• Network Operating systemsNetwork Operating systems
• Embedded Operating systemsEmbedded Operating systems
13. Stand-Alone Operating systemStand-Alone Operating system
It is a complete operating system that worksIt is a complete operating system that works
on a desktop or notebook computer.on a desktop or notebook computer.
Examples of stand-alone operating systems are:Examples of stand-alone operating systems are:
DOSDOS
Windows 2000 professionalWindows 2000 professional
Mac OS XMac OS X
14. Network Operating systemsNetwork Operating systems
It is an operating system that provides extensiveIt is an operating system that provides extensive
support for computer networks. A networksupport for computer networks. A network
operating system typically resides on a server.operating system typically resides on a server.
Examples of a network Operating system are:Examples of a network Operating system are:
Windows 2000 serverWindows 2000 server
UnixUnix
LinuxLinux
SolarisSolaris
15. Embedded Operating systemEmbedded Operating system
You can find this operating system on handheldYou can find this operating system on handheld
computers and small devices. It resides on acomputers and small devices. It resides on a
ROM chip. Examples of embedded operatingROM chip. Examples of embedded operating
systems are :systems are :
o Windows CEWindows CE
o Pocket PC 2002Pocket PC 2002
o Palm OSPalm OS
16.
17.
18.
19.
20.
21.
22.
23. REAL- TIME OPERATINGREAL- TIME OPERATING
SYSTEM (RTOS) :SYSTEM (RTOS) :
““The ability of the operating system toThe ability of the operating system to
provide a required level of service in aprovide a required level of service in a
bounded response time”.bounded response time”.
OrOr
The Real time operating system is anThe Real time operating system is an
operating system that make it suitable foroperating system that make it suitable for
building real time computing applicationsbuilding real time computing applications
also known as real timealso known as real time systems(RTS).systems(RTS).
24. What is a real time system(RTS)?What is a real time system(RTS)?
A RTS is a system where correctness ofA RTS is a system where correctness of
computing depends not only on the correctnesscomputing depends not only on the correctness
of the logical result of the computation but alsoof the logical result of the computation but also
on the result of delivery time. In a well designedon the result of delivery time. In a well designed
RTS each individual dead line should be met.RTS each individual dead line should be met.
But in practice it is not possible and also costlyBut in practice it is not possible and also costly
to achieve this requirement. So, people classifiedto achieve this requirement. So, people classified
the real time systems in to the following types.the real time systems in to the following types.
25. Hard Real timeHard Real time::
Here missing an individual deadline results inHere missing an individual deadline results in
catastrophic failure of the system which alsocatastrophic failure of the system which also
causes a great financial loss .causes a great financial loss .
The examples for Hard real time systems areThe examples for Hard real time systems are::
Air traffic controlAir traffic control
Nuclear power plant controlNuclear power plant control
26. Firm Real timeFirm Real time
In this, missing a deadline results inIn this, missing a deadline results in
unacceptable quality reduction. Technicallyunacceptable quality reduction. Technically
there is no difference with hard Real time, butthere is no difference with hard Real time, but
economically the disaster risk is limited.economically the disaster risk is limited.
Examples for Firm real time are :Examples for Firm real time are :
o Failure of Ignition of a automobileFailure of Ignition of a automobile
o Failure of opening of a safeFailure of opening of a safe
27. Soft real timeSoft real time::
Here the dead line may not be fulfilled and can beHere the dead line may not be fulfilled and can be
recovered from. The reduction in system qualityrecovered from. The reduction in system quality
and performance is at an acceptable level.and performance is at an acceptable level.
Examples of Soft real time systems :Examples of Soft real time systems :
Multimedia transmission and receptionMultimedia transmission and reception
Networking, telecom (Mobile) networksNetworking, telecom (Mobile) networks
websites and serviceswebsites and services
Computer gamesComputer games
28. Components of an RTOSComponents of an RTOS
Process (task) managementProcess (task) management
SchedulerScheduler
Synchronization mechanismSynchronization mechanism
Interprocess communication (IPC)Interprocess communication (IPC)
SemaphoresSemaphores
Memory managementMemory management
Interrupt service mechanismInterrupt service mechanism
I/O management , H.A.LayerI/O management , H.A.Layer
Development EnvironmentsDevelopment Environments
Communication subsystems (Option)Communication subsystems (Option)
Board Support Packages (BSP)Board Support Packages (BSP)
29. Features of RTOS’sFeatures of RTOS’s
PredictabilityPredictability
TimelinessTimeliness
ReliabilityReliability
Fault tolerantFault tolerant
Efficiency of SystemEfficiency of System
ComponentsComponents
Resource Allocation.Resource Allocation.
Interrupt Handling.Interrupt Handling.
Other issues like kernelOther issues like kernel
size.size.
30. Types of RTOSTypes of RTOS
Commercial RTOSsCommercial RTOSs
VxWorksVxWorks
QNXQNX
MicroC/OS-IIMicroC/OS-II
RTLinuxRTLinux
Windows CE ( www.microsoft.com)Windows CE ( www.microsoft.com)
31. VxWorksVxWorks
This is from Wind River (This is from Wind River (www.windriver.comwww.windriver.com).).
One of the most popular real time operatingOne of the most popular real time operating
systemsystem
This has been used in the Mars pathfinderThis has been used in the Mars pathfinder
It supports a number of processors includingIt supports a number of processors including
Power Pc, Intel strong ARM,ARM,HitachiPower Pc, Intel strong ARM,ARM,Hitachi
SuperH, Motorola ColdFire etc…SuperH, Motorola ColdFire etc…
It supports multiple scheduling algorithm andIt supports multiple scheduling algorithm and
also priority inheritancealso priority inheritance
32. RTLinuxRTLinux
This OS was developed by FSM Labs(This OS was developed by FSM Labs(
www.fsmlabs.comwww.fsmlabs.com) and available in two versions) and available in two versions
RTLinux Pro and RTLinuxFree.RTLinux Pro and RTLinuxFree.
The RTLinux Pro is the priced edition andThe RTLinux Pro is the priced edition and
RTLinux Free is the free open source release.RTLinux Free is the free open source release.
RTLinux is a hard real-time operating systemRTLinux is a hard real-time operating system
with support for many processors such aswith support for many processors such as
x86,Pentium,PowerPC,ARM,Fujitsu,MIPS andx86,Pentium,PowerPC,ARM,Fujitsu,MIPS and
AlphaAlpha
It does not support priority inheritance.It does not support priority inheritance.
33. Windows CEWindows CE
Windows CE (also known officially as WindowsWindows CE (also known officially as Windows
Embedded Compact and sometimesEmbedded Compact and sometimes
abbreviated WinCE) is an operating systemabbreviated WinCE) is an operating system
developed by Microsoft for minimalisticdeveloped by Microsoft for minimalistic
computers and embedded systems.computers and embedded systems.
Windows CE is optimized for devices that haveWindows CE is optimized for devices that have
minimal storage—a Windows CE kernel mayminimal storage—a Windows CE kernel may
run in under a megabyte of memoryrun in under a megabyte of memory
34. Programming languages UsedProgramming languages Used
C is most widely used in RTOS programmingC is most widely used in RTOS programming
C++ and Ada are the next more popular for largeC++ and Ada are the next more popular for large
projects.projects.
Assembly languages for increasing efficiency andAssembly languages for increasing efficiency and
reusing the previous codereusing the previous code
Java may also be a choice for some applicationsJava may also be a choice for some applications
35. REFERENCESREFERENCES
Modern Operating Sytems-Modern Operating Sytems- Andrew S. Tanenbaum (PHI)Andrew S. Tanenbaum (PHI)
Operating Systems –W. Stallings (PHI)Operating Systems –W. Stallings (PHI)
Operating system Concepts-Avi Silberschatz & PeterOperating system Concepts-Avi Silberschatz & Peter
Baer Galvin.Baer Galvin.
Operating Systems-D. M. Dhamdhere- TMHOperating Systems-D. M. Dhamdhere- TMH