翻訳と辞書 Words near each other ・ Priority (album) ・ Priority (fencing) ・ Priority Bicycles ・ Priority board ・ Priority Bus Route ・ Priority call ・ Priority ceiling protocol ・ Priority date ・ Priority Development Assistance Fund ・ Priority Development Assistance Fund scam ・ Priority Dispatching Rules ・ Priority draft pick ・ Priority effect ・ Priority encoder ・ Priority inheritance ・ Priority inversion ・ Priority level ・ Priority Material Office ・ Priority Matrix ・ Priority product ・ Priority Products and Materials report ・ Priority queue ・ Priority R-tree ・ Priority Records ・ Priority review voucher ・ Priority right ・ Priority seat ・ Priority sector lending ・ Priority signs ・ Priority Sports and Entertainment Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Priority inversion ： ウィキペディア英語版 Priority inversion In computer science, priority inversion is a problematic scenario in scheduling in which a high priority task is indirectly preempted by a medium priority task effectively "inverting" the relative priorities of the two tasks. This violates the priority model that high priority tasks can only be prevented from running by higher priority tasks and briefly by low priority tasks which will quickly complete their use of a resource shared by the high and low priority tasks. ==Example of a priority inversion== Consider two tasks ''H'' and ''L'', of high and low priority respectively, either of which can acquire exclusive use of a shared resource ''R''. If ''H'' attempts to acquire ''R'' after ''L'' has acquired it, then ''H'' becomes blocked until ''L'' relinquishes the resource. Sharing an exclusive-use resource (''R'' in this case) in a well-designed system typically involves ''L'' relinquishing ''R'' promptly so that ''H'' (a higher priority task) does not stay blocked for excessive periods of time. Despite good design, however, it is possible that a third task ''M'' of medium priority (''p''(''L'') < ''p''(''M'') < ''p''(''H''), where ''p''(''x'') represents the priority for task ''x'') becomes runnable during ''Ls use of ''R''. At this point, ''M'' being higher in priority than ''L'' preempts ''L'', causing ''L'' to not be able to relinquish ''R'' promptly, in turn causing ''H''—the highest priority process—to be unable to run. This is called ''priority inversion'' where a higher priority task is preempted by a lower priority one. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Priority inversion」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.