public synchronized int allocateNextChunk() {
        if ((used_bytes.longValue() + (long) mem_chunksize) > max_allowed_bytes) {
            logger.info("No memory left");
            return 0;
        }
        used_bytes.set(used_bytes.longValue() + (long) mem_chunksize);
        return mem_chunksize;
    }
public synchronized int allocateNextChunk ( ) { if ( ( used_bytes . longValue ( ) + ( long ) mem_chunksize ) > max_allowed_bytes ) { logger . info ( "No memory left" ) ; return 0 ; } used_bytes . set ( used_bytes . longValue ( ) + ( long ) mem_chunksize ) ; return mem_chunksize ; }
This method tries to mark memory as allocated. It allocates as much bytes as defined in <code>MEMORY_CHUNK</code>
and returns the number of bytes marked as allocated. This method doesn't really allocate memory.

@return the size of the allocated chunk