Is a read to a volatile field happens before every subsequent write?

Question

Java Concurrency in Practice says (in JMM chapter)
Volatile variable rule: a write to a volatile field happens before every subsequent read of that same field

My question is : A read to a volatile field happens before any/every subsequent write on that same field ??

assylias · Answer 1 · 2014-01-25T08:17:22.290

1

Theoretically it is a one way relationship. The exhaustive list of happens-before relationships is defined in the JLS #17.4.5 and only includes hb(volatile write, volatile read).

However it is likely that it is implemented both ways by the JVM (it is the case for hotspot).

edited Jan 25 '14 at 08:17

answered Jan 25 '14 at 08:10

assylias

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Is a read to a volatile field happens before every subsequent write?

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