3.2 Java VM Information and instance reference

Procedures about Java VM Information and instance references.
Please refer a Java document about "Reference".

Function: jvm-available-processors

returns the available processors by Java VM.

Function: jvm-free-memory

Function: jvm-max-memory

Function: jvm-total-memory

return free memory, max memory and total memory of Java VM by bytes, respectively.

Function: garbage-collector

starts the garbage collectior.

Function: reference? obj

check is the object is Java reference.

Function: reference-queue? obj

check is the object is Java reference queue.

Function: reference-cleared? reference

check is the reference is cleared.

Function: reference-enqueueed? reference

check is the reference is in a reference queue.

Function: make-weak-reference obj

Function: make-soft-reference obj

Function: make-phantom-reference obj

creates a weak reference, a soft reference, and a phantom reference, respectively.

Function: make-reference-queue

creates a reference queue.

Function: reference-get reference

gets an object from the reference.
returns #f is the reference has been cleared.

Function: refernce-clear reference

clears the reference.

Function: refernce-enqueue reference

enqueues the reference.

Function: refernce-queue-poll reference-queue

refers a reference from the reference-queue. returns #f if any datum is not in the queue.

Function: refernce-queue-remove reference-queue

removes a reference from the reference queue and returns the reference, or #f if any datum is not in the queue.

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