nio package and asynchronous io

Mon Feb 4 12:10:00 GMT 2002

Nic Ferrier wrote:
>Jakob Praher <praher.keg@liwest.at> writes:
>>>the buffers are actually quite interesting: 
>>>>they provide a new method for dealing with blocks of memory. 
>>there are buffer classes for all primitive types, like 
>>java.nio.ByteBuffer, java.nio.IntBuffer, .... 
>>>>one of the neat things about the ByteBuffer, is that it can be told to 
>>be a direct buffer, which means the memory underlying the buffer is 
>>countigous allocated. 
>>>>buffers should help to reduce garbage production, as you can allocate 
>>the memory once and reuse it. 
>>>>Yes. I looked at the buffering in 1.4. I seem to remember they added
>some new bytecode instructions to facilitate handling buffers. Is that
>true?
>No. they didn't add new bytecodes (at least not in classfiles, what the 
VM do internally is
another issue).
OTOH, they added 3 JNI functions to create/access native buffers in 
native code.
>I guess they'd be new instructions to deal with contiguous memory
>blocks.
>No.
Cedric
>I'm cross posting this to the GCJ list, because it might be
>interesting to see what they say about the viability of adding this
>kind of memory allocation (given that GCJ uses the boehm-gc.
>>>Nic
>