Lecture-1
... • These libraries are stored on disk. • Linker links only the libraries referenced by the program • Main disadvantage: needs a lot of memory (for example, consider standard functions such as printf and scanf. They are used almost by every application. Now, if a system is running 50-100 processes, ea ...
... • These libraries are stored on disk. • Linker links only the libraries referenced by the program • Main disadvantage: needs a lot of memory (for example, consider standard functions such as printf and scanf. They are used almost by every application. Now, if a system is running 50-100 processes, ea ...
Chorusamoeba
... When a process is executing, all of its segments are in memory. No swapping or paging. Amoeba can only run programs that fit in physical memory. Advantage: simplicity and high performance. ...
... When a process is executing, all of its segments are in memory. No swapping or paging. Amoeba can only run programs that fit in physical memory. Advantage: simplicity and high performance. ...
hw1_wet
... system calls. For example: msgame_init is a code wrapper and sys_msgame_init is a system call (see the slides for tutorial 2). Also, you will need to change some other functions in the kernel accordingly. Code wrappers: The following describes the wrappers prototype and behavior. The actual implemen ...
... system calls. For example: msgame_init is a code wrapper and sys_msgame_init is a system call (see the slides for tutorial 2). Also, you will need to change some other functions in the kernel accordingly. Code wrappers: The following describes the wrappers prototype and behavior. The actual implemen ...
Operating Systems - Home - KSU Faculty Member websites
... • Timesharing (multitasking) is logical extension in which CPU switches jobs so frequently that users can interact with each job while it is running, creating interactive computing – Response time should be < 1 second – Each user has at least one program executing in memory process – If several job ...
... • Timesharing (multitasking) is logical extension in which CPU switches jobs so frequently that users can interact with each job while it is running, creating interactive computing – Response time should be < 1 second – Each user has at least one program executing in memory process – If several job ...
Introduction to Object Technology
... • Modular structure for flexibility • Executes on a variety of hardware ...
... • Modular structure for flexibility • Executes on a variety of hardware ...
Sai Uday Kiran Ravi`s presentation on Application Security on
... the new thread’s initial state. This includes cloning the memory integrity hashes and thread context (including the instruction pointer), thereby ensuring that the new thread can only be started in the same state as its parent. To ensure that signals are delivered to the correct entry point, Overs ...
... the new thread’s initial state. This includes cloning the memory integrity hashes and thread context (including the instruction pointer), thereby ensuring that the new thread can only be started in the same state as its parent. To ensure that signals are delivered to the correct entry point, Overs ...
1-web
... Some early computers protected the operating system by placing it in a memory partition that could not be modified by either the user job or the operating system itself. Describe two difficulties that you think could arise with such a scheme. Answer: ...
... Some early computers protected the operating system by placing it in a memory partition that could not be modified by either the user job or the operating system itself. Describe two difficulties that you think could arise with such a scheme. Answer: ...
Slide 1
... Operating System Concept: Process(1) • A process is basically a program in execution • Each process is associated with its address space which contains code segment, data segment, stack segment etc.) • A process can open several files. • Multitasking operating system – Can run multiple processes co ...
... Operating System Concept: Process(1) • A process is basically a program in execution • Each process is associated with its address space which contains code segment, data segment, stack segment etc.) • A process can open several files. • Multitasking operating system – Can run multiple processes co ...
2. Operating System Overview
... • Modular structure for flexibility • Executes on a variety of hardware ...
... • Modular structure for flexibility • Executes on a variety of hardware ...
Operating System Overview
... • Modular structure for flexibility • Executes on a variety of hardware ...
... • Modular structure for flexibility • Executes on a variety of hardware ...
UNIX/Linux Environment
... UNIX/Linux environment How to login to Linux server? How to copy files from/to Windows/Linux? Basics of UNIX/Linux Operating Systems Some basic mostly used command The power of the “command line” File system and access modes ...
... UNIX/Linux environment How to login to Linux server? How to copy files from/to Windows/Linux? Basics of UNIX/Linux Operating Systems Some basic mostly used command The power of the “command line” File system and access modes ...
Chapter - 5th Semester Notes
... • The I/O operations implemented via DMA also read and write data in memory. • To improve both the utilization of CPU and the speed of the computer’s response to its users, we keep several programs in memory. ...
... • The I/O operations implemented via DMA also read and write data in memory. • To improve both the utilization of CPU and the speed of the computer’s response to its users, we keep several programs in memory. ...
Hassan Al-Makso`s presentation on Making OS Reliable and Secure
... Each of the four different attempts to improve operating system reliability focuses on preventing buggy device drivers from crashing the system. In the Nooks approach, each driver is individually hand wrapped in a software jacket to carefully control its interactions with the rest of the operati ...
... Each of the four different attempts to improve operating system reliability focuses on preventing buggy device drivers from crashing the system. In the Nooks approach, each driver is individually hand wrapped in a software jacket to carefully control its interactions with the rest of the operati ...
Lecture 2
... 1. Arrange each program to perform a single function. 2. Avoid extraneous output, another program might use it as input. 3. If possible, use or modify existing tools rather write a new one. 4. Create the design first, then start with a small prototype and add features incrementally. ...
... 1. Arrange each program to perform a single function. 2. Avoid extraneous output, another program might use it as input. 3. If possible, use or modify existing tools rather write a new one. 4. Create the design first, then start with a small prototype and add features incrementally. ...
Introduction to OS
... OS and reinstallation of the same. There was no concept of data hiding , encapsulation or protecting data from any function. The modification in one module had chances of introducing errors in other modules. Drawbacks: ...
... OS and reinstallation of the same. There was no concept of data hiding , encapsulation or protecting data from any function. The modification in one module had chances of introducing errors in other modules. Drawbacks: ...
Unix/Linux: History and Philosophy
... ∗ The memory allocated to a process is private to the process, that is, other programs cannot see the code and data for a given program unless special permission is granted ∗ The files that belong to a certain user may not be visible to other users unless permission is granted · The superuser has pe ...
... ∗ The memory allocated to a process is private to the process, that is, other programs cannot see the code and data for a given program unless special permission is granted ∗ The files that belong to a certain user may not be visible to other users unless permission is granted · The superuser has pe ...
OsQuestionPaper
... 2 Throughput 3 Efficiency 4 Capacity 24. Resource locking ________. 1 Allows multiple tasks to simultaneously use resource 2 Forces only one task to use any resource at any time 3 Can easily cause a dead lock condition 4 Is not used for disk drives 25. What is a shell ? 1 It is a hardware component ...
... 2 Throughput 3 Efficiency 4 Capacity 24. Resource locking ________. 1 Allows multiple tasks to simultaneously use resource 2 Forces only one task to use any resource at any time 3 Can easily cause a dead lock condition 4 Is not used for disk drives 25. What is a shell ? 1 It is a hardware component ...
ppt
... Invalid address: interrupt prompts a SEGV signal to the process Access to a valid address but there is not page in memory. This causes the CPU to load the page from disk Invalid permission (I.e. trying to write on a read only page) causes a SEGV signal to the process. ...
... Invalid address: interrupt prompts a SEGV signal to the process Access to a valid address but there is not page in memory. This causes the CPU to load the page from disk Invalid permission (I.e. trying to write on a read only page) causes a SEGV signal to the process. ...
Linux Kernel—File Systems
... Is used during system calls acting on files The VFS is an indirection layer which handles the file oriented system calls and calls the necessary functions in the physical file system code to do the I/O. Knows about filesystem types supported in the kernel. It uses a table defined during the kernel c ...
... Is used during system calls acting on files The VFS is an indirection layer which handles the file oriented system calls and calls the necessary functions in the physical file system code to do the I/O. Knows about filesystem types supported in the kernel. It uses a table defined during the kernel c ...
over view of operating system
... I/O Subsystem One purpose of OS is to hide peculiarities of hardware devices from the user I/O subsystem responsible for Memory management of I/O including buffering (storing data temporarily while it is being transferred), caching (storing parts of data in faster storage for performance), spo ...
... I/O Subsystem One purpose of OS is to hide peculiarities of hardware devices from the user I/O subsystem responsible for Memory management of I/O including buffering (storing data temporarily while it is being transferred), caching (storing parts of data in faster storage for performance), spo ...
Slide Set 1
... A thread, or thread of execution, is the set of instructions being executed in a process. In a single thread system each process has exactly one execution engine (the logical machine). In a multi-thread environment, a process may have many execution engines, one for each thread. Thus, each thread ha ...
... A thread, or thread of execution, is the set of instructions being executed in a process. In a single thread system each process has exactly one execution engine (the logical machine). In a multi-thread environment, a process may have many execution engines, one for each thread. Thus, each thread ha ...
Unix File System
... 1. If the effective user ID of the calling process is the superuser (root), the kernel sets as real and effective user ID the input parameter uid. 2. If the effective user ID of the calling process is not the superuser: 2.1 If uid = real user ID, the effective user ID is set to uid (success). 2.2 El ...
... 1. If the effective user ID of the calling process is the superuser (root), the kernel sets as real and effective user ID the input parameter uid. 2. If the effective user ID of the calling process is not the superuser: 2.1 If uid = real user ID, the effective user ID is set to uid (success). 2.2 El ...
Underlying computer system = hardware + software
... able to deal with such a complex system? – Don’t we need an intermediary? ...
... able to deal with such a complex system? – Don’t we need an intermediary? ...