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RCV_timer when receiver s timer interrupt occurs then abort protocol on receiver s site end in Software Encoding barcode data matrix in Software RCV_timer when receiver s timer interrupt occurs then abort protocol on receiver s site end

RCV_timer when receiver s timer interrupt occurs then abort protocol on receiver s site end using software toaccess ecc200 for asp.net web,windows application upc Event RCV_timer The datamatrix 2d barcode for None event RCV_timer is enabled when the receiver s timer reaches its speci ed delay. The action consists in aborting the protocol (from the point of view of the receiver). Note: The sender knows that the le has been successfully sent and received when event SND_rcv observes that the le is empty (we suppose that the le is not empty at the beginning).

It seems (but are we sure ) that event SND_timer cannot wake up event SND_snd while the le is empty. Likewise, the sender knows that the le has been entirely sent, but that the last data has not been necessarily received. This happens when event SND_timer aborts the protocol, while the sender s le has just got one piece of data left.

The receiver knows that the protocol ends successfully when it receives the last data; this is supposed to be indicated by a special information put on the last data itself.. 6.1.7 About the pse udo-code The de nition of our protocol by means of this pseudo-code (or by means of any other similar descriptive notation) raises a number of questions.

Are we sure that such a description is correct in the sense that it e ectively corresponds to a le transfer protocol Are we sure that the described protocol does terminate (no in nite loop, no deadlock) What kind of properties should this protocol maintain It is our opinion that these questions cannot be answered on the basis of such an informal description only. Nevertheless, we believe that it is quite useful to have such a description at our disposal, since it may act as a goal to our future protocol construction. In the sequel, and as said above, we shall formally construct our protocol starting from a mathematical speci cation of its main properties, and ending up with a formal.

Bounded re-transmission protocol description of its components, which we might then fruitfully compare to their informal pseudo-code counterparts. The main drawback of such descriptions, which are often said to constitute the speci cation of these protocols, is that they describe a rather informal implementation. This is the reason why it is so important to rewrite clearly our informal speci cation as a proper requirements document.

This is what we intend to do in the next section.. 6.2 Requirements do Software data matrix barcodes cument The requirements document which we propose now is far less precise than the previous informal explanations we have given. It is far less precise in that it does not propose an implementation.

It essentially consists in explaining what kind of belief each site may have at the end of the protocol. We also make precise when such beliefs are indeed true. Here are our requirements for the bounded retransmission protocol.

We rst make precise the overall purpose of the protocol: The bounded retransmission protocol is a le transfer protocol. Its goal is to totally or partially transfer a certain non-empty original sequential le from one site, the sender, to another, the receiver. Then we explain what a total transfer means: A total transfer means that the transmitted le is an exact copy of the original one.

We also explain what a partial transfer means: A partial transfer means that the transmitted le is a pre x of the original one. We describe now what both sites may believe at the end of the protocol: Each site may end up in any of the two situations: either it believes that the protocol has terminated successfully, or it believes that the protocol has aborted before being successfully terminated..

FUN-1. FUN-2. FUN-3. FUN-4. 6.3 Re nement strategy We relate the belie Data Matrix 2d barcode for None fs of both the sender and the receiver: When the sender believes that the protocol has terminated successfully, then the receiver believes so too. Conversely, when the receiver believes that the protocol has aborted, then the sender believes so too..

FUN-5. We explain that it Software Data Matrix barcode is possible that these beliefs are not shared by both participants: However, it is possible for the sender to believe that the protocol has aborted, while the receiver believes that it has terminated successfully. We explain nally that the belief of the receiver is always true: When the receiver believes that the protocol has terminated successfully, this is because the original le has been entirely copied on the receiver s site. In other words, the receiver s belief is true.

. FUN-6. FUN-7. When the receiver b elieves that the protocol has aborted, this is because the original le has not been copied entirely on the receiver s site. Again, the receiver s belief is true..

FUN-8. 6.3 Re nement strat egy In this short section, we present our strategy for constructing the bounded retransmission protocol. This will be done by means of an initial model followed by six re nements.

The initial model set up the scene by taking account of requirements FUN-4 stating the nal situation of both participants of the protocol. In the rst and second re nement, we take care of the requirements FUN-5 and FUN-6, stating some relationship between the status of the two participants. In the third re nement, we introduce the transmitted le.

It takes account of requirement FUN-1 to FUN-3. In this re nement, the receiver only enters into the scene..

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