November 2012
Intermediate to advanced
888 pages
54h 46m
Polish
Content preview from Ruby. Receptury
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20.11. Unikanie zakleszczeń
Problem
Wątki rywalizują o wyłączny dostęp do tych samych zasobów. Bez ich synchronizacji może dojść do zakleszczenia. Wątek A będzie zablokowany, oczekując na zasób będacy w posiadaniu wątku B, a wątek B będzie zablokowany, oczekując na zasób będący w posiadaniu wątku A. Żaden z wątków nie wznowi działania.
Rozwiązanie
Nie istnieje proste rozwiązanie tego problemu. Trzeba opracować reguły ustanawiania blokad przez wątki i zapewnienia ich przestrzegania.
Ogólnie rzecz biorąc, trzeba zagwarantować ustanawianie blokad przez wątki w tej samej kolejności. Należy ustanowić kolejkowanie (formalnie bądź nieformalnie) blokad w programie i zapewnić, aby wątki ustanawiały blokady w rosnącym porządku.
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.