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Erschienen in:
2013 | OriginalPaper | Buchkapitel
Mutual Exclusion
verfasst von : Wolfgang Reisig
Erschienen in: Understanding Petri Nets
Verlag: Springer Berlin Heidelberg
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By the 1960s, mutual exclusion was recognized as one of the central problems in the organization of computer systems. It arises whenever a resource can be accessed by only one of many processes at any one time (for instance, a processor, a printer or a communications device). While a process is using the resource, it is in its
critical
state. An agreement between the processes has to guarantee that no two processes can be in their critical states at the same time. We will introduce such an agreement in which processes can only communicate via asynchronous messages.