Formal Models of Operating System Kernels phần 7 doc
Formal Models of Operating System Kernels phần 7 doc
... message contains the identifier of the sending process. Italso contains two natural numbers (elements of N). They denote the size of the data area and the size of the stack area that are, respectively, ... prove some fairly general properties of themessage-passing system. Proposition 112. The message-passing mechanism is synchronous.Proof. By the predicates of SendMessage and RcvMessage.If the ... design. However, many readers will, asa result of reading standard texts, be of the (false) opinion that kernels mustbe interrupt-driven. The kernel of the last chapter was driven, in part, by...
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Formal Models of Operating System Kernels phần 10 pot
... 278 haveVictim 274 onPageFault 278 retrievePageFromDisk 276 storePageOnDisk 276 swapPageToDisk 275 PageFaultISR:INIT 272 OnPageInterrupt 272 PageFrames:ClearRefBitsAndCounter 271 ComputeHitCounts 271 GetPage ... 146Relation:<P 71 =P 71 >P 71 ≥P 71 ≤P 71 smap 289Class:AlarmRQBuffer 182CLOCKISR 177 , 225CURRENTPROCESS 78 ClockDriver 183, 225Context 69, 1 27, 210DeZombifier 178 GenericISR 174 GenericMsgISR 213GENREGSET ... in the future. 7. 2 ReviewThe formal models of three operating systems have been presented. All three kernels are intended for use on uni-processor systems. They are also examples of how the classical...
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Formal Models of Operating System Kernels phần 9 potx
... Npgallocstart =0The value of 0 is completely arbitrary, as is now explained.Some systems map a virtual copy of the operating system onto the vir-tual address space of each user space (and some ... determine a number of properties of CCS and CSP processes, including observational equivalence andbisimilarity. The propositions concerning equivalence of the various versions of the subsystem were ... from Proposition 174 . The predicate of genOnPageFault contains an instance of MakeReadywith the faulting process’ identifier substituted for the formal parameter. ✷Proposition 178 . If a page fault...
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Formal Models of Operating System Kernels phần 8 pot
... comprising the system- call library all send and receivemessages. Therefore, the rest of the proof must be in terms of the properties of the message-passing subsystem.The message-passing subsystem is ... of sharedpages(p)(sg), for some p and sg.Proof. Similar to the previous proof. ✷Proposition 134. IsLockedPage iff lpno? is a locked page; that is, iff lpno?is an element of lockedpages.Proof. ... sg?, lpno?, incore)Proposition 1 37. MarkPageAsOut is satisfied iff lpno? isnotanelementofincore.Proof. Substituting the definition of unmarkpage into the predicate of theschema MarkPageAsOut:incore=...
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Formal Models of Operating System Kernels phần 6 pptx
... most significant aspect of this chapter’s model is that it actsas an existence proof. It is possible to define a formal model of an operating system kernel and to prove some of its properties. In ... of the current kernel.5.2 RequirementsThe requirement is to model an operating system kernel that is based uponthe exchange of messages between processes. The kernel should be an example of ... cannot be used. Indeed, it is of a complexity not far from that of thetiny kernels used for embedded and some real-time systems. The µC/OS [18]is a good example of such a kernel.The kernel...
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Formal Models of Operating System Kernels phần 5 pps
... to determine all the children of a parent process.4.8 General ResultsThis final section contains the proof of a number of propositions that dealwith properties of the kernel.The propositions ... an idea of some of the other things that might need to be handled during termination).If a process is on disk when it is terminated (say, because of system ter-mination or because of some error ... enabling it to be represented withinthe system. As part of this, a test (proctab.CanGenPId)ismadeastowhetherthe system has reached its maximum number of processes. The schema is com-plicated...
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Formal Models of Operating System Kernels phần 4 pot
... descendant of the ancestor of the process just blocked.Proof. This requires the proof of the following lemma.Lemma 16. For any process, p, BlockProcessChildren implies that there areno children of ... closure of the childof relation; the complete set of descendants of a given process are represented by childof+(|{p?}|) for any process identifierp?. In BlockProcessChildren, ps is the set of descendants ... falsifies the predicate of theschema. ✷Proposition 78 . If the allocating hole is ≥ rqsz?, the hole is split into twoparts: one of size = rqsz ?, the other of size, s, s ≥ 0.Proof. There are two...
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Formal Models of Operating System Kernels phần 3 ppt
... •parentof (p1, p?))RemoveProcessFromParent∆(parentof )parent?, child?:APREFparentof= parentof \{(parent?, child?)}ParentOfProcessp?:APREFparent!:APREF(∃ p1: APREF •parentof (p1, ... priority of process,p. If p is an element of q, then MakeUnready[p/pid?] implies that p is notan element of q.Proof. There are two cases to consider:Case 1. Process p is the head of q. The ... ⊆ known procs ∧ dom childof ⊆ known procsran childof ⊆ known procs ∧ ran childof = ran parentchildof∼= parentof ∧ code owners ⊆ dom parentof(∀ p1, p2: APREF •p1∈ dom blockswaiting...
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Formal Models of Operating System Kernels phần 2 pps
... performed, the inclusion of IdleProcRef and the ex-clusion of NullProcRef are of some importance. They determine the range of possible values for the domains of the components of process descriptors. ... the idle process, of course.Proof. The components of the process description, pstate, pkind, pstack,pregs, etc., all have identical domains by the first part of the invariant of PROCESSES.Thatis:dom ... interruptsoccur during the execution of a piece of code. They are used as a kind of low-level mutual exclusion mechanism.4.3 Common Structures 101Proof. By a previous Lemma (Lemma 5), | scnt|...
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Formal Models of Operating System Kernels phần 1 pdf
... scope for different models is relatively broad. Formal Models of Operating System Kernels x Contents3.6 Current Process and Prioritised Ready Queue 77 3 .7 MessagesandSemaphoreTables 813.8 Process ... the upper layers of an operating system. OS Kit is a software kit, not a formal specification or modellingtool.Iain D. Craig Formal Models of Operating System Kernels ContentsPreface vii1 ... 2004 on operating systems verification [23];• Zhou and Black’s work [ 37] .Much of the formal work on operating systems has been verificational innature. That is, given some working software,...
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