Dependable Computing - EDCC 5: 5th European Dependable by Pascal Traverse, Isabelle Lacaze, Jean Souyris (auth.),

By Pascal Traverse, Isabelle Lacaze, Jean Souyris (auth.), Mario Dal Cin, Mohamed Kaâniche, András Pataricza (eds.)

It is usually a distinct honor to chair the eu liable Computing C- ference (EDCC). EDCC has develop into one of many well-established meetings within the ?eld of dependability within the eu learn quarter. Budapest was once chosen because the host of this convention as a result of its traditions in organizing foreign scienti?c occasions and its conventional function of serving as a gathering element among East and West. EDCC-5 was once the ?fth within the sequence of those top of the range scienti?c conf- ences. as well as the general signi?cance of this kind of pan-European occasion, this year’s convention used to be a different one as a result of ancient purposes. The roots of EDCC date again to the instant while the Iron Curtain fell. initially, teams of scientists from di?erent eu international locations in Western and jap Europe – who have been lively in learn and schooling regarding dependability created a – joint discussion board to be able to merge their groups as early as in 1989. This development has persevered as much as this present day. This year’s convention used to be the ?rst one the place the overpowering majority of the examine teams belong to the kinfolk of ecu countries united within the eu Union. prior to now sixteen years we saw that an identical roots in the entire expert, cultural and scienti?c senses resulted in a continuing integration of those examine groups formerly separated ar- ?cially for a very long time. EDCC has develop into one of many major ecu systems to interchange new - searchideasinthe?eldofdependability.

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Extra info for Dependable Computing - EDCC 5: 5th European Dependable Computing Conference, Budapest, Hungary, April 20-22, 2005. Proceedings

Example text

By examining the code of the protocol, the only place where a process could block is the wait statement of line 4. In this statement a process waits until is received messages from all unsuspected processes and from at least n − t processes. Yet, due to the completeness property of P t , all crashed processes are eventually detected, and thus, a process cannot wait forever due to a failed process. Moreover, by the assumption on the minimality of k, then all correct processes eventually start their k-th iteration, and in particular, each of them sends at least k distinct ALIVE(−) messages.

In that way, we get the protocol described in Figure 4 that implements Σ from P t . Note that each iteration in the protocol of Figure 4 consists of only one message exchange, which at rst glance appears to contradict the necessity of having two communication steps. A closer look, however, reveals that there in no contradiction. Essentially, the value of trustedi is only valid after the second iteration of the protocol. Thus, consider any implementation of the application interface of P t , which returns the list of trusted processes to an application or higher level protocol.

Unfortunately, given the difficulty of ensuring that stipulated bounds on computation times and transmission delays are always met (which is notoriously difficult with many systems, especially those built out of COTS products), the safety/liveness/timeliness properties achieved with such systems may have a poor coverage. This holds true for any design that rests upon (some) timed semantics, including timed asynchronous systems [28] and the Timely Computing Base [29]. With such solutions, the core questions are: How do you set your timers?

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