StackOverflow2013

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2013-01-16T03:52:41.523
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<blockquote> First of all, Wikipedia and many blogs say that all volatile variables are stored in a Thread-Local memory over the main memory shared by all threads. </blockquote> That is incorrect. Volatile fields are instance or class (static) variables and are stored in the heap. They might be referring to cache memory that is specific to a single processor / core ... but that is a hardware-specific thing. But this is definitely not "thread-local". That term means something entirely different. <blockquote> If so, then what happen if the volatile variable is an object reference and not a primitive literal? </blockquote> Nothing special. Your assumptions are incorrect. Volatile variables are not stored on the stack. <blockquote> I know each thread has his own stack memory where it stores its own primitive literals & objects references. </blockquote> What is stored on the thread's stack is: <ul> <li>the method's local variables,</li> <li>the method's parameters,</li> <li>the method's return address etc so that the CPU knows where to go when the call returns, and (possibly)</li> <li>state of local objects that the JIT compiler has figured don't need to be stored in the heap.</li> </ul> A method's primitive literals are typically embedded in the code itself. String literals are elsewhere too. (When those literals are assigned to local variables they will be held on the stack ...) <blockquote> Second, could you please explain in details using an example how the volatile keyword works and when we are supposed to use it? </blockquote> Check the comments, and the related questions ... or Google "java volatile example". An explanation would be redundant.
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1. POVolatile Keyword & the thread local memory
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