[concurrency-interest] volatile guarantee for directbuffer

Pavel Rappo pavel.rappo at gmail.com
Tue Feb 14 09:27:21 EST 2012


On 14 Feb 2012, at 18:09, Talip Ozturk wrote:

> Say we have thread1 and thread2. Both can access a volatile boolean
> variable, 'volatileVar' and DirectByteBuffer instance 'directBuffer'
> 
> thread1:
> directBuffer.put(myByteArray);
> directBuffer.putLong(myLong);
> volatileVar = true;
> 
> thread2:
> if (volatileVar) {
>  // read the directBuffer
>  directBuffer.get(myByteArray);
>  long myLong = directBuffer.getLong();
> }
> 
> Can I assume that thread2 did read the byte[] and long values?
> 
> Does volatile-reads give us happens-before guarantee for OffHeap data?
> 
> Thanks,
> -talip
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