Chapter 5 Concurrency: Mutual Exclusion and Synchronization
... Mutual Exclusion • Condition in which there is a set of concurrent processes, only one of which is able to access a given resource or perform a given function at any time • One approach involves the use of special purpose machine instructions ...
... Mutual Exclusion • Condition in which there is a set of concurrent processes, only one of which is able to access a given resource or perform a given function at any time • One approach involves the use of special purpose machine instructions ...
A high-performance, POSIX compatible, multicore real-time
... Enea OSE employs a distributed software architecture that makes it easy for programmers to conceptualize, partition, and develop complex applications, whether they are deployed on a single CPU or distributed across multiple CPUs, blades and shelves. This communications-driven architecture, utilizing ...
... Enea OSE employs a distributed software architecture that makes it easy for programmers to conceptualize, partition, and develop complex applications, whether they are deployed on a single CPU or distributed across multiple CPUs, blades and shelves. This communications-driven architecture, utilizing ...
system programs
... Processes • Recall: a process is not just a program – it is a dynamic entity. • A given program (e.g. emacs) could be executing many times on a given machine – the machine must represent each execution as a separate process. ...
... Processes • Recall: a process is not just a program – it is a dynamic entity. • A given program (e.g. emacs) could be executing many times on a given machine – the machine must represent each execution as a separate process. ...
Objectives Process control block (1) Process Control Block (2)
... Kernel saves context (e.g registers, pointers, memory management information etc) into the process’ PCB Loads context of the new process scheduled to ...
... Kernel saves context (e.g registers, pointers, memory management information etc) into the process’ PCB Loads context of the new process scheduled to ...
Operating System Concepts
... represents a set of standards implemented primarily for UNIX-based operating systems. POSIX-compliant systems must implement the POSIX core standard (POSIX .1)--Linux, Solaris, and Mac OS X. POSIX also defines several extensions to the standards, including real-time extensions (POSIX 1.b) and an ext ...
... represents a set of standards implemented primarily for UNIX-based operating systems. POSIX-compliant systems must implement the POSIX core standard (POSIX .1)--Linux, Solaris, and Mac OS X. POSIX also defines several extensions to the standards, including real-time extensions (POSIX 1.b) and an ext ...
lecture5-sept15
... Why? More parallelism, make use of CPU even when it gets moved to the waiting state ...
... Why? More parallelism, make use of CPU even when it gets moved to the waiting state ...
Semester 2 2012/2013
... sequence of instructions that execute for that process and this listing is referred to as a ________ of the process. ...
... sequence of instructions that execute for that process and this listing is referred to as a ________ of the process. ...
Unit 2
... threads • Kernel thread block, blocks all user threads • Multiple user threads in kernel thread cannot execute concurrently on multi processor ...
... threads • Kernel thread block, blocks all user threads • Multiple user threads in kernel thread cannot execute concurrently on multi processor ...
Chapter 3 Process Description and Control Major
... ring, or some other structure. For example, all processes in a waiting state for a particular priority level may be linked in a queue. A process may exhibit a parent-child (creator-created) relationship with another process. The process control block may contain pointers to other processes to suppor ...
... ring, or some other structure. For example, all processes in a waiting state for a particular priority level may be linked in a queue. A process may exhibit a parent-child (creator-created) relationship with another process. The process control block may contain pointers to other processes to suppor ...
RAJALAKSHMI ENGINEERING COLLEGE
... A computer system has many resources - hardware & software that may be required to solve a problem, like CPU time, memory space, file-storage space, I/O devices & so on. The OS acts as a manager for these resources so it is viewed as a resource allocator.The OS is viewed as a control program because ...
... A computer system has many resources - hardware & software that may be required to solve a problem, like CPU time, memory space, file-storage space, I/O devices & so on. The OS acts as a manager for these resources so it is viewed as a resource allocator.The OS is viewed as a control program because ...
Using Interaction Networks for Visualisation of Message Passing
... passing patterns that occur in MINIX. The events recorded by the monitor relate to: reception of keyboard input, sending and receiving of messages, and creation and termination of processes. One way of analysing an interaction network is to browse a display of it. Figure 1 shows an interaction netwo ...
... passing patterns that occur in MINIX. The events recorded by the monitor relate to: reception of keyboard input, sending and receiving of messages, and creation and termination of processes. One way of analysing an interaction network is to browse a display of it. Figure 1 shows an interaction netwo ...
Chapter 3 Process Description and Control
... • Must include this information: – Allocation of main memory to processes – Allocation of secondary memory to processes – Protection attributes of blocks of main or virtual memory – Information needed to manage virtual memory ...
... • Must include this information: – Allocation of main memory to processes – Allocation of secondary memory to processes – Protection attributes of blocks of main or virtual memory – Information needed to manage virtual memory ...
interrupt
... Basically, an operating system is interrupt driven. Dual-Mode operation: kernel mode + user mode ...
... Basically, an operating system is interrupt driven. Dual-Mode operation: kernel mode + user mode ...
What is an Operating System?
... One purpose of OS is to hide peculiarities of hardware devices from the ...
... One purpose of OS is to hide peculiarities of hardware devices from the ...
Multi-processor and Real
... that is used by a job currently using more than one processor – Hold request until processor is available – Assign processor a job in the list that currently has no processors (i.e., to all waiting new arrivals) ...
... that is used by a job currently using more than one processor – Hold request until processor is available – Assign processor a job in the list that currently has no processors (i.e., to all waiting new arrivals) ...
H 10.3. File-System Interface
... Process interaction with different permissions root root root root root ...
... Process interaction with different permissions root root root root root ...
Chapter 10 Multiprocessor and Real
... that is used by a job currently using more than one processor – Hold request until processor is available – Assign processor a job in the list that currently has no processors (i.e., to all waiting new arrivals) ...
... that is used by a job currently using more than one processor – Hold request until processor is available – Assign processor a job in the list that currently has no processors (i.e., to all waiting new arrivals) ...
a login shell
... • The .cshrc file is read any time a C shell starts • If you write a csh script, you should probably use the -f option to keep C shell scripts from reading .cshrc. • The .login file is read when you start a login shell. In this file you can set: – Environment variables (which UNIX will pass to subsh ...
... • The .cshrc file is read any time a C shell starts • If you write a csh script, you should probably use the -f option to keep C shell scripts from reading .cshrc. • The .login file is read when you start a login shell. In this file you can set: – Environment variables (which UNIX will pass to subsh ...
Malware defenses (cont)
... • systrace only forwards monitored sys-calls to monitor (efficiency) • systrace resolves sym-links and replaces sys-call path arguments by full path to target • When app calls execve, monitor loads new policy file ...
... • systrace only forwards monitored sys-calls to monitor (efficiency) • systrace resolves sym-links and replaces sys-call path arguments by full path to target • When app calls execve, monitor loads new policy file ...
process
... I/O Tables • Used by the OS to manage the I/O devices and channels of the computer. • The OS needs to know – Whether the I/O device is available or assigned – The status of I/O operation – The location in main memory being used as the source or destination of the I/O transfer ...
... I/O Tables • Used by the OS to manage the I/O devices and channels of the computer. • The OS needs to know – Whether the I/O device is available or assigned – The status of I/O operation – The location in main memory being used as the source or destination of the I/O transfer ...
Modern Operating System - Tanenbaum solution 3rd
... minutes after the first one starts. With two jobs, the approximate CPU utilization is 1 − 0.52 . Thus each one gets 0.375 CPU minute per minute of real time. To accumulate 10 minutes of CPU time, a job must run for 10/0.375 minutes, or about 26.67 minutes. Thus running sequentially the jobs finish a ...
... minutes after the first one starts. With two jobs, the approximate CPU utilization is 1 − 0.52 . Thus each one gets 0.375 CPU minute per minute of real time. To accumulate 10 minutes of CPU time, a job must run for 10/0.375 minutes, or about 26.67 minutes. Thus running sequentially the jobs finish a ...
COS 318: Operating Systems Virtual Machine Monitors Jaswinder Pal Singh
... ESX Server – Memory Virtualization Maintains shadow page tables with virtual to machine address mappings. u Shadow page tables are used by the physical processor u ESX maintains the pmap data structure for each VM with “physical” to machine address mappings u ESX can easily remap a machine pa ...
... ESX Server – Memory Virtualization Maintains shadow page tables with virtual to machine address mappings. u Shadow page tables are used by the physical processor u ESX maintains the pmap data structure for each VM with “physical” to machine address mappings u ESX can easily remap a machine pa ...