process threads
... Process and thread states: – Task_running: scheduled or waiting to be scheduled – Task_interruptible: sleeping on an event, but may receive a signal – Task_uninterruptible: sleeping and may not receive a signal – Task_stopped: operation has been stopped by a signal – Task_zombie: operation completed ...
... Process and thread states: – Task_running: scheduled or waiting to be scheduled – Task_interruptible: sleeping on an event, but may receive a signal – Task_uninterruptible: sleeping and may not receive a signal – Task_stopped: operation has been stopped by a signal – Task_zombie: operation completed ...
第五章输入输出
... Device Controllers I/O devices have components: mechanical component （device） electronic component ...
... Device Controllers I/O devices have components: mechanical component （device） electronic component ...
Najwa Knefati CH3 summary
... A new process is initially put in the ready queue. It waits there until it is selected for execution, or dispatched. Once the process is allocated the CPU and is executing_ one of several events could occur: • The process could issue an I/O request and then be placed in an I/O queue. • The process c ...
... A new process is initially put in the ready queue. It waits there until it is selected for execution, or dispatched. Once the process is allocated the CPU and is executing_ one of several events could occur: • The process could issue an I/O request and then be placed in an I/O queue. • The process c ...
General requirements for improved intelligence in Status polling via
... Confusion over the difference between internally generated events and SNMP traps often arises because the source of the NNM status events are set to the device to which it refers, not NNM itself, making it appear the node in question was the source of the event. Also, NNM events and SNMP traps are d ...
... Confusion over the difference between internally generated events and SNMP traps often arises because the source of the NNM status events are set to the device to which it refers, not NNM itself, making it appear the node in question was the source of the event. Also, NNM events and SNMP traps are d ...
3 Threads SMP Microkernel
... • The OS supports multiple threads of execution within a single process • A process in a multithreaded environment has: – A virtual address space that holds the process image – Protected access to processors, other processes, files, and I/O ...
... • The OS supports multiple threads of execution within a single process • A process in a multithreaded environment has: – A virtual address space that holds the process image – Protected access to processors, other processes, files, and I/O ...
Utility-Maximizing Data Dissemination in Socially Selfish
... to volatile channel occupancy patterns of the primary users while trying to maximize the end-to-end throughput utility among all data sessions. Another dimension of complexity is added to the picture if we drop the usual assumption of fully collaborative data relay among secondary users and explicit ...
... to volatile channel occupancy patterns of the primary users while trying to maximize the end-to-end throughput utility among all data sessions. Another dimension of complexity is added to the picture if we drop the usual assumption of fully collaborative data relay among secondary users and explicit ...
“End-to-end Routing for Dual-Radio Sensor Networks,”
... class of Wireless Sensor Network devices that provide both lowenergy operation as well as substantially increased computational performance and communication bandwidth for applications. In such systems, the secondary radio and processor operates with sufficiently low power that it may remain always ...
... class of Wireless Sensor Network devices that provide both lowenergy operation as well as substantially increased computational performance and communication bandwidth for applications. In such systems, the secondary radio and processor operates with sufficiently low power that it may remain always ...
Chapter 4
... Created when Job Scheduler accepts job Updated as job executes Queues use PCBs to track jobs Contains all necessary job management processing data – PCBs linked to form queues (jobs not linked) – Manage queues using process scheduling policies and algorithms ...
... Created when Job Scheduler accepts job Updated as job executes Queues use PCBs to track jobs Contains all necessary job management processing data – PCBs linked to form queues (jobs not linked) – Manage queues using process scheduling policies and algorithms ...
as a PDF
... memory in order to free up main memory for other processes, swapping the process back in later when more memory is available, or when the process has been unblocked and is no longer waiting for a resource [1][2]. In many systems today (those that support mapping virtual address space to secondary st ...
... memory in order to free up main memory for other processes, swapping the process back in later when more memory is available, or when the process has been unblocked and is no longer waiting for a resource [1][2]. In many systems today (those that support mapping virtual address space to secondary st ...
Routing in packet switching networks
... – Simplify the implementation of ATM switches and make very high speed operation possible – Many functions can be implemented in hardware – ATM switches are very scalable, such as 10,000 ports with each port running at 150Mbps – Small waiting time and delay – Finer degree of control ...
... – Simplify the implementation of ATM switches and make very high speed operation possible – Many functions can be implemented in hardware – ATM switches are very scalable, such as 10,000 ports with each port running at 150Mbps – Small waiting time and delay – Finer degree of control ...
6. Process Synchronization
... Information sharing: Since several users may be interested in the same piece of information (for 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 sub ...
... Information sharing: Since several users may be interested in the same piece of information (for 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 sub ...
An Incentive Driven Lookup Protocol For Chord-Based Peer-to-Peer (P2P) Networks
... The need for developing protocols for selfish agents (nodes) in P2P systems has often been stressed before (see [3], [4], [5]). The research in ([6], [7], [8], [9]) provides solution to avoid free-riding problem in P2P networks. The basic approach in all of these is to make sure that nodes indeed sh ...
... The need for developing protocols for selfish agents (nodes) in P2P systems has often been stressed before (see [3], [4], [5]). The research in ([6], [7], [8], [9]) provides solution to avoid free-riding problem in P2P networks. The basic approach in all of these is to make sure that nodes indeed sh ...
Definition of Operating System
... The processors communicate with one another through various communication lines (such as high-speed buses or telephone lines). These are referred as loosely coupled systems or distributed systems. Processors in a distributed system may vary in size and function. These processors are referred as site ...
... The processors communicate with one another through various communication lines (such as high-speed buses or telephone lines). These are referred as loosely coupled systems or distributed systems. Processors in a distributed system may vary in size and function. These processors are referred as site ...
Slides for Chapter 3: Networking and
... components that provide the communication facilities for a distributed system. • Hosts are used to refer to the computers and other devices that use the network for communication purposes. • A node is used to refer to any computer or switching device attached to a network. • A subnet is a unit of ro ...
... components that provide the communication facilities for a distributed system. • Hosts are used to refer to the computers and other devices that use the network for communication purposes. • A node is used to refer to any computer or switching device attached to a network. • A subnet is a unit of ro ...
ppt
... • Performance challenge – order of magnitude slower than native code • New machines faster than older machines so can reduce slowdown ...
... • Performance challenge – order of magnitude slower than native code • New machines faster than older machines so can reduce slowdown ...
Figure 5.01
... Asynchronous signal is caused by an event external to a running process. Terminating a process () or a timer expires.
Options for delivering signals in a multithreaded process:
Signal to the thread to which the signal applies.
Signal to all threads.
Signal to certain threads. ...
... Asynchronous signal is caused by an event external to a running process. Terminating a process (
2. Operating System Case Study: Linux
... interface (GUI) is available for Linux: – Uses pointing devices (e.g. mouse) to control the system, similar to Microsoft’s Windows ...
... interface (GUI) is available for Linux: – Uses pointing devices (e.g. mouse) to control the system, similar to Microsoft’s Windows ...
PDF
... is updated, as latency between nodes on the Internet can change dynamically. The newly discovered nodes are placed on B’s rings as secondary members. For a node to initially join the system, it needs to know the IP address of one of the nodes in the Meridian overlay. The newly joining node contacts ...
... is updated, as latency between nodes on the Internet can change dynamically. The newly discovered nodes are placed on B’s rings as secondary members. For a node to initially join the system, it needs to know the IP address of one of the nodes in the Meridian overlay. The newly joining node contacts ...
A user-mode port of the Linux kernel
... kernel, whenever they do a system call. So, the usermode kernel needs a way of converting a switch to real kernel mode into a switch to virtual kernel mode. Without it, there is no way to virtualize system calls, and no way to run this kernel. This is implemented with the Linux ptrace system call tr ...
... kernel, whenever they do a system call. So, the usermode kernel needs a way of converting a switch to real kernel mode into a switch to virtual kernel mode. Without it, there is no way to virtualize system calls, and no way to run this kernel. This is implemented with the Linux ptrace system call tr ...
Virtual Router - UCF CS - University of Central Florida
... • Overall, false accusation is very low. • False accusation is higher when nodes move faster. Suspect node forwards the detection packet after moving out of the radio range of the detecting nodes causing false accusation (i.e., not forwarding the detection packet) ...
... • Overall, false accusation is very low. • False accusation is higher when nodes move faster. Suspect node forwards the detection packet after moving out of the radio range of the detecting nodes causing false accusation (i.e., not forwarding the detection packet) ...
Security - Elsevier Store
... personal information voluntarily shared, but stolen from sites granted access to it or misused can lead to identity theft. Privacy concerns are different for the three cloud delivery models and also depend on the actual context. ...
... personal information voluntarily shared, but stolen from sites granted access to it or misused can lead to identity theft. Privacy concerns are different for the three cloud delivery models and also depend on the actual context. ...
Content distribution network should be layered.
... Attention: This is a document submitted to the work of ITU-T and is intended for use by the participants to the activities of ITU-T's Focus Group on IPTV, and their respective staff and collaborators in their ITU-related work. It is made publicly available for information purposes but shall not be r ...
... Attention: This is a document submitted to the work of ITU-T and is intended for use by the participants to the activities of ITU-T's Focus Group on IPTV, and their respective staff and collaborators in their ITU-related work. It is made publicly available for information purposes but shall not be r ...
Distributed operating system
A distributed operating system is a software over a collection of independent, networked, communicating, and physically separate computational nodes. Each individual node holds a specific software subset of the global aggregate operating system. Each subset is a composite of two distinct service provisioners. The first is a ubiquitous minimal kernel, or microkernel, that directly controls that node’s hardware. Second is a higher-level collection of system management components that coordinate the node's individual and collaborative activities. These components abstract microkernel functions and support user applications.The microkernel and the management components collection work together. They support the system’s goal of integrating multiple resources and processing functionality into an efficient and stable system. This seamless integration of individual nodes into a global system is referred to as transparency, or single system image; describing the illusion provided to users of the global system’s appearance as a single computational entity.