Table lock - PowerPoint PPT Presentation

Locking and concurrency

Locking and concurrency. Overview. In multi-user systems, several users may update the same information concurrently – i.e. at the same time. Locking allows A user to take hold of a block for updating. No-one else can modify the same data. When a user modifies data through a transaction,

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Dining Philosophers

Dining Philosophers. A “Classical” Synchronization Problem devised by Edsger Dijkstra in 1965 (modified for the masses by Tony Hoare) You have 5 philosophers sitting around a table Spaghetti on the table 5 forks around the table Each philosopher needs 2 forks to eat.

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506 views • 7 slides

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