Korea Univ Real-Time Systems
... • We don’t want to know which programs will share main memory with other programs when we compile them • In fact, the programs sharing main memory change dynamically while the programs are running • Because of this dynamic interaction, we would like to compile each program into its own address space ...
... • We don’t want to know which programs will share main memory with other programs when we compile them • In fact, the programs sharing main memory change dynamically while the programs are running • Because of this dynamic interaction, we would like to compile each program into its own address space ...
Sistemas Operativos
... – Current activity including program counter, processor registers – Stack containing temporary data • Function parameters, return addresses, local variables – Data section containing global variables – Heap containing memory dynamically allocated during run time ...
... – Current activity including program counter, processor registers – Stack containing temporary data • Function parameters, return addresses, local variables – Data section containing global variables – Heap containing memory dynamically allocated during run time ...
lecture 14
... The main disadvantage of the semaphore discussed in the previous section is that they all require busy waiting. While a process is in its critical section, any other process that tries to enter its critical section must loop continuously in the entry code. This continual looping is clearly a problem ...
... The main disadvantage of the semaphore discussed in the previous section is that they all require busy waiting. While a process is in its critical section, any other process that tries to enter its critical section must loop continuously in the entry code. This continual looping is clearly a problem ...
Operating System Services
... System Calls Programming interface to the services provided by the OS Typically written in a high-level language (C or C++) Mostly accessed by programs via a high-level Application Program Interface ...
... System Calls Programming interface to the services provided by the OS Typically written in a high-level language (C or C++) Mostly accessed by programs via a high-level Application Program Interface ...
Chap 1: Introduction
... Economy of scale Increased reliability graceful degradation (The ability to continue providing service proportional to the level of surviving hardware). fail-soft systems (systems designed for graceful degration) Asymmetric multiprocessing （非对称处理） Master processor schedules and allocated wor ...
... Economy of scale Increased reliability graceful degradation (The ability to continue providing service proportional to the level of surviving hardware). fail-soft systems (systems designed for graceful degration) Asymmetric multiprocessing （非对称处理） Master processor schedules and allocated wor ...
ch11file_system_implementation
... Boot block (boot control block, kernel or loader, first block in boot partition) ...
... Boot block (boot control block, kernel or loader, first block in boot partition) ...
solutions - CIS @ UPenn
... non-trivial outcome using only messages for communication. Answer: see the lecture note on distributed systems. 3. For the following questions on user-level threads vesus kernel-level threads, assume that process A has one thread and process B has 10 threads, and the scheduler allocates the time sli ...
... non-trivial outcome using only messages for communication. Answer: see the lecture note on distributed systems. 3. For the following questions on user-level threads vesus kernel-level threads, assume that process A has one thread and process B has 10 threads, and the scheduler allocates the time sli ...
interrupt - Universidade de Coimbra
... Each program runs for a short period of time, then another is run. When a program is running and is forcibly replaced by another, typically with a higher priority, it is said to have been preempted, thus the term Preemptive Operating Systems ...
... Each program runs for a short period of time, then another is run. When a program is running and is forcibly replaced by another, typically with a higher priority, it is said to have been preempted, thus the term Preemptive Operating Systems ...
Unix History, and Background
... programs to run on different Unix variants. • As long as the operating system uses POSIX compliant mechanisms, it can run software regardless of the actual variant used. • POSIX standard (1003) is administered by IEEE (Institute of Electrical and Electronics Engineers) • The standard is also recogni ...
... programs to run on different Unix variants. • As long as the operating system uses POSIX compliant mechanisms, it can run software regardless of the actual variant used. • POSIX standard (1003) is administered by IEEE (Institute of Electrical and Electronics Engineers) • The standard is also recogni ...
7.2 Peripheral Supplementary
... The occurrence of an event is usually signaled by an interrupt from either the hardware or the software. Hardware (device) may trigger an interrupt at any time by sending a signal to the CPU usually by system bus. Software may trigger an interrupt by executing a special operation called a system cal ...
... The occurrence of an event is usually signaled by an interrupt from either the hardware or the software. Hardware (device) may trigger an interrupt at any time by sending a signal to the CPU usually by system bus. Software may trigger an interrupt by executing a special operation called a system cal ...
Using Information Technology - City University of Hong Kong
... Thin client - users download not only data but also different kinds of application software from an online source ...
... Thin client - users download not only data but also different kinds of application software from an online source ...
OOS Chapter 8
... – Restore original data – Ensure /etc/fstab has appropriate entries to mount filesystems ...
... – Restore original data – Ensure /etc/fstab has appropriate entries to mount filesystems ...
Delimited continuations in operating systems
... operating-system research, continuations are poorly known and seldom used explicitly. In this paper, we cross the boundary between operating systems and programming languages to argue by examples that continuations, especially delimited ones, pervade operating systems—if only implicitly. We contend ...
... operating-system research, continuations are poorly known and seldom used explicitly. In this paper, we cross the boundary between operating systems and programming languages to argue by examples that continuations, especially delimited ones, pervade operating systems—if only implicitly. We contend ...
Quiz 1 - FSU Computer Science
... a. .NET b. JIT c. JVM d. VMware 45. True/False KDE and GNOME desktops are available under open-source licenses. 46. True/False A program written for the .NET Framework need not worry about the specifics of the hardware or the operating system on which it will run. 47. True/False Many operating syste ...
... a. .NET b. JIT c. JVM d. VMware 45. True/False KDE and GNOME desktops are available under open-source licenses. 46. True/False A program written for the .NET Framework need not worry about the specifics of the hardware or the operating system on which it will run. 47. True/False Many operating syste ...
OPERATINGSYSTEMS 2015
... 44. Define critical section problem and explain the requirements to be met by a solution to the critical section problem. 45. Discuss any two classic problems of synchronization. 46. Explain the following terms: i) Mutex ii) Race condition 47. Explain the Readers-Writers problem in detail. 48. Expla ...
... 44. Define critical section problem and explain the requirements to be met by a solution to the critical section problem. 45. Discuss any two classic problems of synchronization. 46. Explain the following terms: i) Mutex ii) Race condition 47. Explain the Readers-Writers problem in detail. 48. Expla ...
Operating Systems Lab.
... An operating system's le system structure is its most basic level of organization. Almost all of the ways an operating system interacts with its users, applications, and security model are dependent upon the way it stores its les on a storage device. A file system can be seen in terms of two differe ...
... An operating system's le system structure is its most basic level of organization. Almost all of the ways an operating system interacts with its users, applications, and security model are dependent upon the way it stores its les on a storage device. A file system can be seen in terms of two differe ...
OS-process-lee
... Example of System State: Intel Core Duo Note the registers that are required to record the “state” of the executing process State is swapped on a ...
... Example of System State: Intel Core Duo Note the registers that are required to record the “state” of the executing process State is swapped on a ...
CENG334 Introduction to Operating Systems
... Open Files Most file operations require searching the directory for the entry associated with the file. To avoid this constant search, most systems require that file be “open”ed, before its use. open(Fi) – search the directory structure on disk for entry Fi, and move the content of entry to memor ...
... Open Files Most file operations require searching the directory for the entry associated with the file. To avoid this constant search, most systems require that file be “open”ed, before its use. open(Fi) – search the directory structure on disk for entry Fi, and move the content of entry to memor ...
Inside and Outside the OS
... Features of Command Languages Can accept input from the user and can output messages to I/O devices Provide ability to create and manipulate variables Include the ability to branch and loop Ability to specify arguments to the program command and to transfer those arguments to variables wit ...
... Features of Command Languages Can accept input from the user and can output messages to I/O devices Provide ability to create and manipulate variables Include the ability to branch and loop Ability to specify arguments to the program command and to transfer those arguments to variables wit ...
Windows XP Boot Process
... • An x86-based computer first starts in real mode. In real mode, the processor disables certain features to allow compatibility with software designed to run on 8-bit and 16-bit processors. Ntldr then switches the processor to 32-bit mode, which allows access to large amounts of memory and enables W ...
... • An x86-based computer first starts in real mode. In real mode, the processor disables certain features to allow compatibility with software designed to run on 8-bit and 16-bit processors. Ntldr then switches the processor to 32-bit mode, which allows access to large amounts of memory and enables W ...
Appendix A-Linux_cs3
... Linux Environments The windows, menus, and dialog boxes most people think of as part of the operating system are actually separate layers, known as the windowing system and the desktop environment. These layers provide the human-oriented graphical user interface (GUI) that enables users to easily w ...
... Linux Environments The windows, menus, and dialog boxes most people think of as part of the operating system are actually separate layers, known as the windowing system and the desktop environment. These layers provide the human-oriented graphical user interface (GUI) that enables users to easily w ...
Exam Review Andy Wang Operating Systems COP 4610 / CGS 5765
... 42 points based on lectures 1-13, assignments 1-4, and project 1 8 points based on your ability to apply various principles learned in the class ...
... 42 points based on lectures 1-13, assignments 1-4, and project 1 8 points based on your ability to apply various principles learned in the class ...
ppt
... • Parent is exiting – OS does not allow child to continue if parent terminates – Cascading termination Principles of Operating Systems I/O Structures and Storage ...
... • Parent is exiting – OS does not allow child to continue if parent terminates – Cascading termination Principles of Operating Systems I/O Structures and Storage ...
ppt
... – System extension via dynamically loaded kernel modules • Environment Variables – System variables such as LIBPATH that are shared state across applications. An attacker can change LIBPATH to load an attackerprovided file as a dynamic library ...
... – System extension via dynamically loaded kernel modules • Environment Variables – System variables such as LIBPATH that are shared state across applications. An attacker can change LIBPATH to load an attackerprovided file as a dynamic library ...