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Deadly Embrace, is it a problem?
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Information générale
Forum:
Visual FoxPro
Catégorie:
Base de données, Tables, Vues, Index et syntaxe SQL
Divers
Thread ID:
00182606
Message ID:
00182617
Vues:
11
>I am seeking information on the possibility of a deadly-embrace situation occuring with SET REPORTESS TO -1.
>
>For example, user 1 locks files A then B. User 2 attempts to lock B then A at the same instant. The first lock executed by each user succeeds and flock() returns. When trying to lock the second file, the lock does not succeed because A and B are both locked.
>
>Is this a problem with VFP? If not, why not? Does the lock manager on the server account for this possibility, or is it just a very high statistical improbability? If it is a problem, what are some solutuions?
>
>Thanks, Dennis Hevener

You may SET REPROCESS TO AUTOMATIC and check for FLOCK() return value, and situation is not deadlocked at least. Also, it's really rare case when explicit FLOCK() is really needed.
Edward Pikman
Independent Consultant
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