[concurrency-interest] Atomics for ByteBuffer
davidcholmes at aapt.net.au
Mon Jul 22 19:36:11 EDT 2013
Indeed this needs to follow the JEP process in general:
which may, or may not, lead to a JSR.
Discussion needs to be initiated on the appropriate openjdk mail alias -
probably nio-dev in this case.
From: concurrency-interest-bounces at cs.oswego.edu
[mailto:concurrency-interest-bounces at cs.oswego.edu]On Behalf Of Nathan
Sent: Tuesday, 23 July 2013 4:09 AM
To: concurrency-interest at cs.oswego.edu
Subject: Re: [concurrency-interest] Atomics for ByteBuffer
I am not sure. I suppose you would need to create a JSR or JEP or
something of that nature.
-NathanOn 7/21/2013 3:54 AM, Martin Thompson wrote:
How would we progress such a change to have an AtomicByteBuffer?
> I see a need for ByteBuffer with atomics (say AtomicByteBuffer).
> Infiniband supports atomic operations over the network. If Infiniband
> atomics were linked to processor atomics and the program uses
> AtomicByteBuffer, then 2 processes on different machines could execute
> atomic operations on the same piece of memory.
> One problem is that the atomic operations can't straddle 2 cache
> If alignment is required, that problem would be solved.
> On 7/19/2013 6:03 AM, Vitaly Davidovich wrote:
> ByteBuffer is not spec'd to be threadsafe, IIRC. Adding these methods
> there would lead to confusion, I think, if they remain spec'd as
> such. Maybe a separate impl can be created to support atomics?
> > Sent from my phone
> > On Jul 19, 2013 8:46 AM, "Martin Thompson" <mjpt777 at gmail.com
> <mailto:mjpt777 at gmail.com>> wrote:
> One of the most common uses I see for Unsafe is building IPC
> implementations. If we want folk to stop using Unsafe then we
> need to give them an alternative.
> Is there any reason why we cannot add atomic methods like
> putOrderedX, putVolatileX, getVolatileX, getAndAddX,
> compareAndSetX to ByteBuffer?
> With these new methods an IPC implementation can be built using
> memory mapped files without resorting to using Unsafe.
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