Midterm Review
... operating system kernel as though they were all hardware A virtual machine provides an interface identical to the underlying bare hardware The operating system creates the illusion of multiple processes, each executing on its own processor with its own (virtual) memory ...
... operating system kernel as though they were all hardware A virtual machine provides an interface identical to the underlying bare hardware The operating system creates the illusion of multiple processes, each executing on its own processor with its own (virtual) memory ...
pptx
... system developed by the IBM Corporation for their then-new System/360 mainframe computer, announced in 1964 ...
... system developed by the IBM Corporation for their then-new System/360 mainframe computer, announced in 1964 ...
(a) and (b)
... differ in different operating systems, and the names of these states are also not standardized. In general, a process can have one of the following five states at a time. State & Description 1. Start: This is the initial state when a process is first started/created. 2. Ready: The process is waiting ...
... differ in different operating systems, and the names of these states are also not standardized. In general, a process can have one of the following five states at a time. State & Description 1. Start: This is the initial state when a process is first started/created. 2. Ready: The process is waiting ...
Chapter10 - Operating Systems
... Each time a process is moved to the running state: – Register values for the currently running process are stored into its PCB – Its PCB is moved to the list of the state into which it goes – Register values of the new process moving into the running state are loaded into the CPU – This exchange of ...
... Each time a process is moved to the running state: – Register values for the currently running process are stored into its PCB – Its PCB is moved to the list of the state into which it goes – Register values of the new process moving into the running state are loaded into the CPU – This exchange of ...
Homework1
... with three states, i.e., two transitions between each pair of states. The diagram, however, only includes four transitions. Could either or both of the missing transitions occur? If so, under which circumstances? *hint* think of edge cases also, possible optimization you can make to scheduler *hint* ...
... with three states, i.e., two transitions between each pair of states. The diagram, however, only includes four transitions. Could either or both of the missing transitions occur? If so, under which circumstances? *hint* think of edge cases also, possible optimization you can make to scheduler *hint* ...
slides
... permission to access the kernel’s address space. If it tries, the hardware raises an exception, which is safely handled by the OS More generally, no user mode code should ever be a security vulnerability. Unless the OS has a bug… ...
... permission to access the kernel’s address space. If it tries, the hardware raises an exception, which is safely handled by the OS More generally, no user mode code should ever be a security vulnerability. Unless the OS has a bug… ...
Chapter 10 - personal.kent.edu
... Roles of an Operating System Operating system System software that – manages computer resources, such as memory and input/output devices – provides an interface through which a human can interact with the computer – allows an application program to interact with these other system resources ...
... Roles of an Operating System Operating system System software that – manages computer resources, such as memory and input/output devices – provides an interface through which a human can interact with the computer – allows an application program to interact with these other system resources ...
Processes
... the code for the running program the data for the running program an execution stack and stack pointer (SP) • traces state of procedure calls made ...
... the code for the running program the data for the running program an execution stack and stack pointer (SP) • traces state of procedure calls made ...
Processes and Process Control Blocks
... instance, a shared file), we must provide an environment to allow concurrent access to these types of resources. Computation speedup: If we want a particular task to run faster, we must break it into subtasks, each of which will be executing in parallel with the others. Such a speedup can be achie ...
... instance, a shared file), we must provide an environment to allow concurrent access to these types of resources. Computation speedup: If we want a particular task to run faster, we must break it into subtasks, each of which will be executing in parallel with the others. Such a speedup can be achie ...
ppt
... Security: The OS calls in kernel mode make sure that the user has enough privileges to run that call. Robustness: If a process that tries to write to an invalid memory location, the OS will kill the program, but the OS continues to run. A crash in the process will not crash the OS. > A bug in user m ...
... Security: The OS calls in kernel mode make sure that the user has enough privileges to run that call. Robustness: If a process that tries to write to an invalid memory location, the OS will kill the program, but the OS continues to run. A crash in the process will not crash the OS. > A bug in user m ...
virtual machine
... I/O operations – since user programs cannot execute I/O operations directly, the operating system must provide some means to perform I/O. File-system manipulation – program capability to read, write, create, and delete files. Communications – exchange of information between processes executing eithe ...
... I/O operations – since user programs cannot execute I/O operations directly, the operating system must provide some means to perform I/O. File-system manipulation – program capability to read, write, create, and delete files. Communications – exchange of information between processes executing eithe ...
Chapter 2 Operating System Overview
... more than one user or program attempts to make use of a shared resource at the same time only one routine at a time allowed to perform an update against the file ...
... more than one user or program attempts to make use of a shared resource at the same time only one routine at a time allowed to perform an update against the file ...
Lecture 2
... The CPU is multiplexed among several jobs that are kept 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 execut ...
... The CPU is multiplexed among several jobs that are kept 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 execut ...
document
... – The key to a time sharing OS, is that the CPU switches between tasks so frequently that interactive users can feel as if they have their own dedicated machine, and interact with each process as it executes. – This frequent switching is accomplished by assigning a short time limit called a time sl ...
... – The key to a time sharing OS, is that the CPU switches between tasks so frequently that interactive users can feel as if they have their own dedicated machine, and interact with each process as it executes. – This frequent switching is accomplished by assigning a short time limit called a time sl ...
Threads
... Each process consists of several threads Basic scheduling unit is thread Can run on different CPUs in SMP in parallel ...
... Each process consists of several threads Basic scheduling unit is thread Can run on different CPUs in SMP in parallel ...
Chapter - 5th Semester Notes
... • Since main memory (primary storage) is volatile and too small to accommodate all data and programs permanently, the computer system must provide secondary storage to back up main memory. • Most modern computer systems use disks as the principle on-line storage medium, for both programs and data. • ...
... • Since main memory (primary storage) is volatile and too small to accommodate all data and programs permanently, the computer system must provide secondary storage to back up main memory. • Most modern computer systems use disks as the principle on-line storage medium, for both programs and data. • ...
Operating System Services
... Resource allocation - When multiple users or multiple jobs running concurrently, resources must be allocated to each of them Many types of resources - Some (such as CPU cycles, main memory, and file storage) may have special allocation code, others (such as I/O devices) may have general request ...
... Resource allocation - When multiple users or multiple jobs running concurrently, resources must be allocated to each of them Many types of resources - Some (such as CPU cycles, main memory, and file storage) may have special allocation code, others (such as I/O devices) may have general request ...
Module 3: Operating-System Structures
... load a program into memory and to run it. • I/O operations – since user programs cannot execute I/O operations directly, the operating system ust provide some means to perform I/O. • File-system manipulation – program capability to read, write, create, and delete files. • Communications – exchange o ...
... load a program into memory and to run it. • I/O operations – since user programs cannot execute I/O operations directly, the operating system ust provide some means to perform I/O. • File-system manipulation – program capability to read, write, create, and delete files. • Communications – exchange o ...
Lecture slides
... • Identifier: A unique integer associated with a process • State : A currently executing process is in running state • Priority : Priority level relative to other processes • Program counter : Address of the next instruction of the program to be executed. • Memory pointers: pointers to the program c ...
... • Identifier: A unique integer associated with a process • State : A currently executing process is in running state • Priority : Priority level relative to other processes • Program counter : Address of the next instruction of the program to be executed. • Memory pointers: pointers to the program c ...
Chapter 4 - people.vcu.edu
... • Operating system supports multiple threads of execution within a single process • MS-DOS supports a single thread • UNIX supports multiple user processes but only supports one thread per process • Windows 2000, Solaris, Linux, Mach, and OS/2 support multiple threads ...
... • Operating system supports multiple threads of execution within a single process • MS-DOS supports a single thread • UNIX supports multiple user processes but only supports one thread per process • Windows 2000, Solaris, Linux, Mach, and OS/2 support multiple threads ...
Process - FmGroup
... Discuss the “thread” part of a process (concurrency) Separate from the “address space” (Protection) Heavyweight Process Process with one thread ...
... Discuss the “thread” part of a process (concurrency) Separate from the “address space” (Protection) Heavyweight Process Process with one thread ...
pdf
... • There must be a system call instruction that switches from user to kernel mode • The system call instruction usually does the following: – causes an exception, which vectors to a kernel handler – passes a parameter, saying which system routine to call – saves caller’s state (PC, SP, other register ...
... • There must be a system call instruction that switches from user to kernel mode • The system call instruction usually does the following: – causes an exception, which vectors to a kernel handler – passes a parameter, saying which system routine to call – saves caller’s state (PC, SP, other register ...
dsk-01-intro
... Another set of OS functions exists for ensuring the efficient operation of the system itself via resource sharing Resource allocation - When multiple users or multiple jobs running concurrently, resources must be allocated to each of them Many types of resources - Some (such as CPU cycles, main ...
... Another set of OS functions exists for ensuring the efficient operation of the system itself via resource sharing Resource allocation - When multiple users or multiple jobs running concurrently, resources must be allocated to each of them Many types of resources - Some (such as CPU cycles, main ...