Merge "Revert "Revert "SharedMemory: break Cleaner reference cycle."""

        mMemoryRegistration = new MemoryRegistration(mSize);

        mCleaner = Cleaner.create(mFileDescriptor,

                new Closer(mFileDescriptor, mMemoryRegistration));

                new Closer(mFileDescriptor.getInt$(), mMemoryRegistration));

    }

    /**

     * Cleaner that closes the FD

     */

    private static final class Closer implements Runnable {

        private FileDescriptor mFd;

        private int mFd;

        private MemoryRegistration mMemoryReference;

        private Closer(FileDescriptor fd, MemoryRegistration memoryReference) {

        private Closer(int fd, MemoryRegistration memoryReference) {

            mFd = fd;

            mMemoryReference = memoryReference;

        }

        @Override

        public void run() {

            try {

                Os.close(mFd);

                FileDescriptor fd = new FileDescriptor();

                fd.setInt$(mFd);

                Os.close(fd);

            } catch (ErrnoException e) { /* swallow error */ }

            mMemoryReference.release();

            mMemoryReference = null;