Formal Models of Operating System Kernels phần 8 pot

Formal Models of Operating System Kernels phần 8 pot

Formal Models of Operating System Kernels phần 8 pot

... 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. ... OnPageRequest = 2 38 5 Using Messages in the Swapping Kernel The procedures comprising the system- call library all send and receive messages. Therefore, the rest of the proof must be in...
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Formal Models of Operating System Kernels phần 10 pot

Formal Models of Operating System Kernels phần 10 pot

... MA, 1 989 . 36. Wirth N. and Gutknecht, J., The Oberon System, Software Practice and Expe- rience, Vol. 19, No. 9, 1 989 . 37. Zhou, D. and Black, Paul E., Formal Specification of Operating Systems ... future. 7.2 Review The 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...
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Formal Models of Operating System Kernels phần 9 potx

Formal Models of Operating System Kernels phần 9 potx

... N pgallocstart =0 The 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 and bisimilarity. The propositions concerning equivalence of the various versions...
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Formal Models of Operating System Kernels phần 4 pot

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 are no children of ... closure of the childof relation; the complete set of descendants of a given process are represented by childof + (|{p?}|) for any process identifier p?. In BlockProcessChildren,...
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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. It also 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 the message-passing system. Proposition 112. The message-passing mechanism is synchronous. Proof. By the predicates of SendMessage and...
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Formal Models of Operating System Kernels phần 6 pptx

Formal Models of Operating System Kernels phần 6 pptx

... most significant aspect of this chapter’s model is that it acts as an existence proof. It is possible to define a formal model of an operating system kernel and to prove some of its properties. In ... cannot be used. Indeed, it is of a complexity not far from that of the tiny kernels used for embedded and some real-time systems. The µC/OS [ 18] is a good example of such a k...
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Formal Models of Operating System Kernels phần 5 pps

Formal Models of Operating System Kernels phần 5 pps

... to determine all the children of a parent process. 4 .8 General Results This final section contains the proof of a number of propositions that deal with 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 becau...
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Formal Models of Operating System Kernels phần 3 ppt

Formal Models of Operating System Kernels phần 3 ppt

... • parentof (p 1 , p?)) RemoveProcessFromParent ∆(parentof ) parent?, child?:APREF parentof  = parentof \{(parent?, child?)} ParentOfProcess p?:APREF parent!:APREF (∃ p 1 : APREF • parentof (p 1 , ... priority of process, p. If p is an element of q, then MakeUnready[p/pid?] implies that p is not an element of q  . Proof. There are two cases to consider: Case 1. Process p is the head o...
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Formal Models of Operating System Kernels phần 2 pps

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 invari...
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Formal Models of Operating System Kernels phần 1 pdf

Formal Models of Operating System Kernels phần 1 pdf

... a real help—I have used formal models as a way of trying out new software ideas since the late 1 980 s). Of course, I hope that people from formal methods and operating systems, as well as computer ... relatively broad. Formal Models of Operating System Kernels x Contents 3.6 Current Process and Prioritised Ready Queue 77 3.7 MessagesandSemaphoreTables 81 3 .8 Proce...
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