Re: RFC: Require VM to provide JNI 1.2 support?

[Steven Augart]

Steven Augart wrote:
> Mark has suggested that it might be a good idea for the next release
> of GNU Classpath to require that the VM provide JNI 1.2.  He's asked
> me to post this Request for Comments on the idea.

Any objections to making it JNI 1.4 instead of JNI 1.2?  I believe it would
not be much of a burden on VM Implementors; there are only three new functions
involved, and they can all be stubbed out.  On the other hand, there appears to
be the potential of major efficiencies.

To quote from the Sun JNI spec:

Three new functions introduced in SDK/JRE 1.4 allow JNI code to create, 
examine, and manipulate direct buffers:

    * NewDirectByteBuffer
    * GetDirectBufferAddress
    * GetDirectBufferCapacity

Every implementation of the Java virtual machine must support these functions, 
but not every implementation is required to support JNI access to direct 
buffers. If a JVM does not support such access then the NewDirectByteBuffer and 
GetDirectBufferAddress functions must always return NULL, and the 
GetDirectBufferCapacity function must always return -1. If a JVM does support 
such access then these three functions must be implemented to return the 
appropriate values.
--
Steven Augart

Jikes RVM, a free, open source, Virtual Machine:
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