Formal Models of Operating System Kernels phần 10 pot
Formal Models of Operating System Kernels phần 10 pot
... 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 how the classical ... proof of the correctness of the model for
semaphores.
The second kernel is of approximately the complexity of kernels such as
those built by Digital Equipment for the excellen...
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...
Formal Models of Operating System Kernels phần 8 pot
... comprising the system- call library all send and receive
messages. 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 lock...
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,...
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...
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 ... of the current kernel.
5.2 Requirements
The requirement is to model an operating system kernel that is based upon
the exchange of messages between processes. The kernel should...
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 because...
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...
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. ... interrupts
occur during the execution of a piece of code. They are used as a kind of low-
level mutual exclusion mechanism.
4.3 Common Structures 101
Proof. By a previous...
Formal Models of Operating System Kernels phần 1 pdf
... the upper layers of an
operating system. OS Kit is a software kit, not a formal specification or modelling
tool.
Iain D. Craig
Formal Models of
Operating System
Kernels
Contents
Preface vii
1 ... written.
This was one of the reasons for writing [10] . In addition to that book, formal
models and proofs were used by the author as a way of exploring a number of
new sy...
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