Application of Software Components in Operating System Design
... The text of this doctoral thesis captures my original thoughts related to the HelenOS microkernel multiserver operating system. The text describes my overall in luence on the design of HelenOS and also my individual contributions to the implementation of HelenOS. That being written, it is completely ...
... The text of this doctoral thesis captures my original thoughts related to the HelenOS microkernel multiserver operating system. The text describes my overall in luence on the design of HelenOS and also my individual contributions to the implementation of HelenOS. That being written, it is completely ...
Introduction to Linux
... ■ sh (Bourne Shell) The sh shell was the earliest shell, being developed for UNIX back in the late 1970s. ■ bash (Bourne-Again Shell) The bash shell is an improved version of the sh shell and is one of the most popular shells today. It’s the default shell used by most Linux distributions. ■ csh (C S ...
... ■ sh (Bourne Shell) The sh shell was the earliest shell, being developed for UNIX back in the late 1970s. ■ bash (Bourne-Again Shell) The bash shell is an improved version of the sh shell and is one of the most popular shells today. It’s the default shell used by most Linux distributions. ■ csh (C S ...
Linus Torvalds - cs.helsinki.fi
... He is the founder and principal developer of the Linux kernel. Linux is a free open-source operating system, just like Windows and Mac OS X, and it is an Unix-based operating system. When we are searching in Google, reading on Kindle, shopping online, people do not know, the software and services ar ...
... He is the founder and principal developer of the Linux kernel. Linux is a free open-source operating system, just like Windows and Mac OS X, and it is an Unix-based operating system. When we are searching in Google, reading on Kindle, shopping online, people do not know, the software and services ar ...
Deadlocks
... Release any resource already being held if the process can't get an additional resource. b) Allow preemption - if a needed resource is held by another process, which is also waiting on some resource, steal it. Otherwise wait. Circular wait: a) Number resources and only request in ascending order. b) ...
... Release any resource already being held if the process can't get an additional resource. b) Allow preemption - if a needed resource is held by another process, which is also waiting on some resource, steal it. Otherwise wait. Circular wait: a) Number resources and only request in ascending order. b) ...
ch13
... The kernel deals with (kernel) virtual addresses These do not necessarily correspond to physical addresses Contiguous virtual addresses are probably not contiguous in physical memory Some systems have an I/O map — the I/O bus manager has a (version of) the virtual memory map More often, the kernel h ...
... The kernel deals with (kernel) virtual addresses These do not necessarily correspond to physical addresses Contiguous virtual addresses are probably not contiguous in physical memory Some systems have an I/O map — the I/O bus manager has a (version of) the virtual memory map More often, the kernel h ...
Open MP
... I can also create N threads that each increment some sum variable element-by-element, but then I’ve got to make sure they don’t step on each other’s toes The first version is a bit less “shared-memory”, but is probably more efficient ...
... I can also create N threads that each increment some sum variable element-by-element, but then I’ve got to make sure they don’t step on each other’s toes The first version is a bit less “shared-memory”, but is probably more efficient ...
Application Performance in the QLinux Multimedia Operating System
... [6] John Regehr and John A. Stankovic, HLS:A Framework for Composing Soft RealTime Schedulers, Proceedings of the 22nd IEEE Real-Time Systems Symposium (RTSS ...
... [6] John Regehr and John A. Stankovic, HLS:A Framework for Composing Soft RealTime Schedulers, Proceedings of the 22nd IEEE Real-Time Systems Symposium (RTSS ...
OS Portal: an economic approach for making an embedded kernel
... The goal of the server-side module linking is to make a resource-limited embedded kernel extensible, while keeping the imposed overheads minimal. As mentioned above, the OS Portal process on the server machine receives requests from client kernels and performs tasks according to those requests. Ther ...
... The goal of the server-side module linking is to make a resource-limited embedded kernel extensible, while keeping the imposed overheads minimal. As mentioned above, the OS Portal process on the server machine receives requests from client kernels and performs tasks according to those requests. Ther ...
Operating-System Structures
... 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 and release code Accounting - To keep track of ...
... 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 and release code Accounting - To keep track of ...
Intro to Linux Slides - Raspberry PI Summer Camp at IPFW
... UNIX, Linux can be just as well used and administered from a remote location, using one of several solutions for remote execution of programs. We briefly touched the subject of security. Linux is an ideal firewall system, light and cheap, but can be used in several other network functions such as ...
... UNIX, Linux can be just as well used and administered from a remote location, using one of several solutions for remote execution of programs. We briefly touched the subject of security. Linux is an ideal firewall system, light and cheap, but can be used in several other network functions such as ...
Document
... • Design a protocol such that each process must request permission to enter its critical section • The section of code implementing this request is the entry section ...
... • Design a protocol such that each process must request permission to enter its critical section • The section of code implementing this request is the entry section ...
第十三章
... 高速缓存—存放数据的快速存储器 Always just a copy 总是数据的拷贝 Key purpose: to improve I/O performance and efficiency Caching and buffering are distinct(截然不同的） functions ，but sometimes a region of memory can be used for both purposes Caching: to improve performance Buffering: to cope with device transfer speed ...
... 高速缓存—存放数据的快速存储器 Always just a copy 总是数据的拷贝 Key purpose: to improve I/O performance and efficiency Caching and buffering are distinct(截然不同的） functions ，but sometimes a region of memory can be used for both purposes Caching: to improve performance Buffering: to cope with device transfer speed ...
ch4
... Different from multiprocessing, multiprogramming, multitasking Concurrency (multithreading) is useful for: improving program structure Improving responsiveness handling concurrent events (e.g., web requests) building parallel programs sharing resources economically multiprocessor utili ...
... Different from multiprocessing, multiprogramming, multitasking Concurrency (multithreading) is useful for: improving program structure Improving responsiveness handling concurrent events (e.g., web requests) building parallel programs sharing resources economically multiprocessor utili ...
Threads
... Thread Specific Data Allows each thread to have its own copy of data Useful when you do not have control over the ...
... Thread Specific Data Allows each thread to have its own copy of data Useful when you do not have control over the ...
Ausgewählte Betriebssysteme Outline of Lectures
... Windows 2000 An Introduction “Ausgewählte Betriebsysteme” ...
... Windows 2000 An Introduction “Ausgewählte Betriebsysteme” ...
hardwareVirtualization.pdf
... of the processor(s) and other platform hardware. VMM presents guest software (see below) with an abstraction of a virtual processor and allows it to execute directly on a logical processor. A VMM is able to retain selective control of processor resources, physical memory, interrupt management, and I ...
... of the processor(s) and other platform hardware. VMM presents guest software (see below) with an abstraction of a virtual processor and allows it to execute directly on a logical processor. A VMM is able to retain selective control of processor resources, physical memory, interrupt management, and I ...
Model Checking Trampoline OS: A Case Study on Safety Analysis
... Figure 2 illustrates the overall verification process using model checking; the initial step consists of two manual activities, construction of the model from the Trampoline kernel code and identification of the safety properties from the software fault tree analysis. Since the verification of the T ...
... Figure 2 illustrates the overall verification process using model checking; the initial step consists of two manual activities, construction of the model from the Trampoline kernel code and identification of the safety properties from the software fault tree analysis. Since the verification of the T ...
Memory Safety for Low-Level Software/Hardware Interactions
... code. Their guarantees are weaker in two ways: (a) they provide type safety for only a subset of objects, and (b) three of the four systems — SafeDrive, SAFECode and SVA — permit dangling pointer references (use-afterfree) to avoid the need for garbage collection. Unlike SafeDrive, however, SAFECode ...
... code. Their guarantees are weaker in two ways: (a) they provide type safety for only a subset of objects, and (b) three of the four systems — SafeDrive, SAFECode and SVA — permit dangling pointer references (use-afterfree) to avoid the need for garbage collection. Unlike SafeDrive, however, SAFECode ...
Memory Safety for Low-Level Software/Hardware Interactions
... code. Their guarantees are weaker in two ways: (a) they provide type safety for only a subset of objects, and (b) three of the four systems — SafeDrive, SAFECode and SVA — permit dangling pointer references (use-afterfree) to avoid the need for garbage collection. Unlike SafeDrive, however, SAFECode ...
... code. Their guarantees are weaker in two ways: (a) they provide type safety for only a subset of objects, and (b) three of the four systems — SafeDrive, SAFECode and SVA — permit dangling pointer references (use-afterfree) to avoid the need for garbage collection. Unlike SafeDrive, however, SAFECode ...
ch5
... Atomic = non-interruptible Either test memory word and set value Or swap contents of two memory words ...
... Atomic = non-interruptible Either test memory word and set value Or swap contents of two memory words ...
Deadlocks
... An arrow from the process to resource indicates the process is requesting the resource. An arrow from resource to process shows an instance of the resource has been allocated to the process. Process is a circle, resource type is square; dots represent number of instances of resource in type. Request ...
... An arrow from the process to resource indicates the process is requesting the resource. An arrow from resource to process shows an instance of the resource has been allocated to the process. Process is a circle, resource type is square; dots represent number of instances of resource in type. Request ...
Omni-Kernel: An Operating System Architecture for Pervasive Monitoring and Scheduling
... dependency labels suffice for enforcing common consistency needs, including those that arise in file systems. Generally, an omni-kernel allows messages to be processed on any available core. But in multi-core architectures, certain sets of messages are best processed on the same core or on cores tha ...
... dependency labels suffice for enforcing common consistency needs, including those that arise in file systems. Generally, an omni-kernel allows messages to be processed on any available core. But in multi-core architectures, certain sets of messages are best processed on the same core or on cores tha ...