OS 07 - Threads 线程 Threads 1 Consider AProcessisaunitof:Resourceownership AddressspaceI/Ochannels,devices,files ExecutionpathInterleavedwithotherprocessesState Whatifwetreateachindependently?UnitofresourceownershipprocessortaskUnitofexecutionthreadorlightweightprocess...
not implementation API specifies behavior of the thread library, implementation is up to development of the library May be provided either as user-level or kernel-level Common in UNIX operating systems (Solaris, Linux, Mac OS X) Modern Linux implementation of pthreads (i.e., NPTL)...
an application can avoid per-process overheads Thread creation, deletion, switching cheaper than processes Threads have full access to address space (easy sharing) Threads can execute in parallel on multiprocessors CS677: Distributed OS
(IEEE 1003.1c) API for thread creation and synchronization API specifies behavior of the thread library, implementation is up to development of the library Common in UNIX operating systems (Solaris, Linux, Mac OS X) Windows XP Threads Implements the one-to-one mapping Each...
Multics Hardware Cheaper, Humans Expensive PCs, Workstations, Rise of GUIs Hardware Really Cheap, Humans Really Expensive Ubiquitous devices, Widespread networking Rapid Change in Hardware Leads to changing OS Batch ? Multiprogramming ? Timeshare ? Graphical UI ? Ubiquitous Devices ? ?? Gradual ...
BeOS Relationshipbetweenkernelthreadsanduserthreads Many-to-onemodel One-to-onemodel Many-to-manymodel104.2MultithreadingModels Many-to-onemodel Manyuser-levelthreadsmappedtosinglekernelthread114.2MultithreadingModels Threadsmanagementisdonebythethreadlibraryinuserspace,soitisefficient(nooftentoinvokesystemcall) The...
memory) In Nachos, threads block by calling Thread::Sleep. A sleeping thread cannot run until the event occurs. The blocked thread is awakened when the event occurs. E.g., Wakeup or Nachos Scheduler::ReadyToRun(Thread* t) In an OS, threads or processes may sleep while executing in the ...
1 Problem •Escapethecurseofblocking!•Aspreadsheetshouldbeabletorecomputethevalueswhilewaitingforuserinput•Afileservershouldbeabletoserveotherclientswhilewaitingadiskreadtocomplete•…Solutions •Multi-processing•Multi-threading•Oneprocess+eventdrivenprogramming WhatisaProcess?•Executioncontext –...
1. Introduction Monitoring the patient's health condition at home has become crucial in modern society. The development of smart devices based on wearable medical technologies has improved healthcare accessibility and enabled real-time patient monitoring. Biological sig- nals, such as electrocardiogram ...
I use Office 2004 and have OS 10.6.4When I receive a PowerPoint file with the .pps ending, the process of opening always defaults to Keynote. To open in PowerPoint, which provides a better display, I need to drag the .pps file to the desktop and change it to .pptAt that point I'...