presentation source
... Must provide functionality of a multiprogramming OS plus additional features to support multiple processors Simultaneous concurrent processes or threads: kernel routines need to be reentrant Scheduling done by any processor, can create conflicts. Synchronization through locks is required. ...
... Must provide functionality of a multiprogramming OS plus additional features to support multiple processors Simultaneous concurrent processes or threads: kernel routines need to be reentrant Scheduling done by any processor, can create conflicts. Synchronization through locks is required. ...
MIPS Assembler Programming
... When a process is running its Program Counter, stack pointer, registers, etc., are loaded on the CPU (I.e., the processor hardware registers contain the current values) When the OS stops running a process, it saves the current values of those registers into the PCB for that process. When the OS is r ...
... When a process is running its Program Counter, stack pointer, registers, etc., are loaded on the CPU (I.e., the processor hardware registers contain the current values) When the OS stops running a process, it saves the current values of those registers into the PCB for that process. When the OS is r ...
Threads, SMP, and Microkernels
... – Each instruction is executed on a different set of data by the different processors ...
... – Each instruction is executed on a different set of data by the different processors ...
Operating system
... 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 jobs ready to run at the same time CPU scheduling – If processes ...
... 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 jobs ready to run at the same time CPU scheduling – If processes ...
Linux Basics
... the OS then evaluates if it is safe, and if so, it does this hardware access on behalf of the requesting program. To enforce this mechanism, modern CPU's have 4 different execution modes built into hardware. By switching between execution modes (also called “privilege levels”) one can allow or disa ...
... the OS then evaluates if it is safe, and if so, it does this hardware access on behalf of the requesting program. To enforce this mechanism, modern CPU's have 4 different execution modes built into hardware. By switching between execution modes (also called “privilege levels”) one can allow or disa ...
PDF
... When a process is running its Program Counter, stack pointer, registers, etc., are loaded on the CPU (I.e., the processor hardware registers contain the current values) When the OS stops running a process, it saves the current values of those registers into the PCB for that process. When the OS is r ...
... When a process is running its Program Counter, stack pointer, registers, etc., are loaded on the CPU (I.e., the processor hardware registers contain the current values) When the OS stops running a process, it saves the current values of those registers into the PCB for that process. When the OS is r ...
Lecture 7: Critical review of semaphores
... processes share critical sections (i.e. parts of two or more processes which need to access some shared resource which can only safely be used by one process at a time). This is possible where lots of processes share lots of resources, in which case a separate binary sem4 is needed for mutual exclus ...
... processes share critical sections (i.e. parts of two or more processes which need to access some shared resource which can only safely be used by one process at a time). This is possible where lots of processes share lots of resources, in which case a separate binary sem4 is needed for mutual exclus ...
Threads, SMP, and Microkernels
... • 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, 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, Solaris, Linux, Mach, and OS/2 support multiple threads ...
Threads, SMP, and Microkernels
... 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, 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, Solaris, Linux, Mach, and OS/2 support multiple threads ...
Discussion #05
... indicated, such as opened files. A history of utilization of the processor or other resources may also be included; this information may be needed by the scheduler. ...
... indicated, such as opened files. A history of utilization of the processor or other resources may also be included; this information may be needed by the scheduler. ...
Introduction to Computer and Operating Systems
... 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 – program loaded in memory process – If several processes ready to run at the same ...
... 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 – program loaded in memory process – If several processes ready to run at the same ...
A1_OS Review_SP09
... a certain amount of time the CPU is switched to another job. The difference is that the switching between jobs occurs so frequently that the users can interact with each program while it is running. This concept is also known as time-sharing. Sometimes the two terms are used interchangeably. ...
... a certain amount of time the CPU is switched to another job. The difference is that the switching between jobs occurs so frequently that the users can interact with each program while it is running. This concept is also known as time-sharing. Sometimes the two terms are used interchangeably. ...
Introduction to Computer and Operating Systems
... 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 – program loaded in memory process – If several processes ready to run at the same ...
... 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 – program loaded in memory process – If several processes ready to run at the same ...
Module 3: Operating
... users or multiple jobs running at the same time. Accounting – keeping track of and recording how much and what kinds of computer resources a user uses for account billing or for accumulating usage statistics. Protection – ensuring that all access to system resources is controlled. ...
... users or multiple jobs running at the same time. Accounting – keeping track of and recording how much and what kinds of computer resources a user uses for account billing or for accumulating usage statistics. Protection – ensuring that all access to system resources is controlled. ...
Processes
... creates a new address space (called the child) copies the parent’s address space into the child’s starts a new thread of control in the child’s address space parent and child are equivalent -- almost • in parent, fork() returns a non-zero integer • in child, fork() returns a zero. • difference allow ...
... creates a new address space (called the child) copies the parent’s address space into the child’s starts a new thread of control in the child’s address space parent and child are equivalent -- almost • in parent, fork() returns a non-zero integer • in child, fork() returns a zero. • difference allow ...
Role of OS
... • “The one program running at all times on the computer” is the one generally used in this course – This is the kernel – Everything else is either a system program (ships with the operating system) or an application program ...
... • “The one program running at all times on the computer” is the one generally used in this course – This is the kernel – Everything else is either a system program (ships with the operating system) or an application program ...
Threads, SMP, and Microkernels
... • 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, 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, Solaris, Linux, Mach, and OS/2 support multiple threads ...
Scheduling Scheduling Criteria Scheduling algorithms Shortest Job
... standard method in time sharing systems Problem: get the time quantum (time before preemption) right. ...
... standard method in time sharing systems Problem: get the time quantum (time before preemption) right. ...
2.4 The service and functions provided by an operating system can
... has several advantages. The system is easier to debug and modify because changes affect only limited sections of the system rather than touching all sections of the operating system. Information is kept only where it is needed and is accessible only within a defined and restricted area, so any bugs ...
... has several advantages. The system is easier to debug and modify because changes affect only limited sections of the system rather than touching all sections of the operating system. Information is kept only where it is needed and is accessible only within a defined and restricted area, so any bugs ...
Questions 1 Question 8.1–1: (Solution, p 3) Name at least two
... process. The operating system allocates resources (such as memory and file descriptors) to a process as a whole, and individual threads within that process share these resources. Thus, a process is a resource allocation unit with at least one thread, while a thread is an execution sequence working w ...
... process. The operating system allocates resources (such as memory and file descriptors) to a process as a whole, and individual threads within that process share these resources. Thus, a process is a resource allocation unit with at least one thread, while a thread is an execution sequence working w ...
Operating Systems
... This allows computers to communicate with each other and be able to share resources such as files and hardware devices over a ...
... This allows computers to communicate with each other and be able to share resources such as files and hardware devices over a ...
Operating Systems CIS 250
... • O/S - running process with address FFF0D • I/O requests to read; produces interrupt • O/S saves the address of process on the system stack; disables other interrupts; gets the address of the I/O service from the vector; service routine is run • Get FFF0D from stack; return to program counter; enab ...
... • O/S - running process with address FFF0D • I/O requests to read; produces interrupt • O/S saves the address of process on the system stack; disables other interrupts; gets the address of the I/O service from the vector; service routine is run • Get FFF0D from stack; return to program counter; enab ...
Lecture 5 Processes
... p these p processes to disk to free up p more memory (to admit new processes) • Blocked state becomes suspend state when swapped to disk ...
... p these p processes to disk to free up p more memory (to admit new processes) • Blocked state becomes suspend state when swapped to disk ...
CS350-03-concurrency
... Each process operates in its own "address space" ■ Address space is a sequence of memory locations (addresses) from 0 to 'n' as seen by the application ■ Process addresses must be "mapped" to real addresses in the real machine ...
... Each process operates in its own "address space" ■ Address space is a sequence of memory locations (addresses) from 0 to 'n' as seen by the application ■ Process addresses must be "mapped" to real addresses in the real machine ...