if (is_cpu_read) reads.push_back(read);
    }
  }
  return success();
}

// Move reads above the `replicate`. Skip reads that come after a write to the
// same resource.
void MoveReads(ReplicateOp replicate,
               llvm::SmallVector<ReadVariableOp, 4>& reads) {
  for (ReadVariableOp read : reads) {
    Value res = read.getResource();

`TryRead` and `TryWrite` are still available for non-blocking reads and writes.

To signify the end of the stream, close the ring buffer from the writer side with `rb.CloseWriter()`

Either side can use `rb.CloseWithError(err error)` to signal an error and close the ring buffer. 
Any reads or writes will return the error on next call.

    @Override
    Class<? extends AbstractEncoder> getEncoder() {
        return super.getEncoder()
    }

    def "reads and writes empty snapshots"() {
        when:
        def out = serialize(EMPTY, serializer)

        then:
        out == EMPTY
    }

    def "reads and writes file snapshots"() {

// that provides an optimized implementation of [ReadFile].
type ReadFileFS interface {
	FS

	// ReadFile reads the named file and returns its contents.
	// A successful call returns a nil error, not io.EOF.
	// (Because ReadFile reads the whole file, the expected EOF
	// from the final Read is not treated as an error to be reported.)
	//
	// The caller is permitted to modify the returned byte slice.

  @Override
  public int readUnsignedByte() throws IOException {
    int b1 = in.read();
    if (0 > b1) {
      throw new EOFException();
    }

    return b1;
  }

  /**
   * Reads an unsigned {@code short} as specified by {@link DataInputStream#readUnsignedShort()},
   * except using little-endian byte order.
   *
   * @return the next two bytes of the input stream, interpreted as an unsigned 16-bit integer in

	_, err = io.ReadFull(f, dst)
	return dst, st, err
}

// ReadFile reads the named file and returns the contents.
// A successful call returns err == nil, not err == EOF.
// Because ReadFile reads the whole file, it does not treat an EOF from Read
// as an error to be reported.
//
// passes NOATIME flag for reads on Unix systems to avoid atime updates.
func ReadFile(name string) ([]byte, error) {

// with code expecting an [io.Writer].
//
// Reads and Writes on the pipe are matched one to one
// except when multiple Reads are needed to consume a single Write.
// That is, each Write to the [PipeWriter] blocks until it has satisfied
// one or more Reads from the [PipeReader] that fully consume
// the written data.
// The data is copied directly from the Write to the corresponding
// Read (or Reads); there is no internal buffering.
//

namespace tensorflow {
// An XLA cluster hoists all resource reads to be beginning of the cluster
// execution and all the resource writes to the end.  This means it cannot
// enforce arbitrary ordering dependencies (via control or data edges) between
// resource operations.  Since all resource reads happen before all resource
// writes, edges constraining resource writes to happen before resource reads

  @Override
  public int readUnsignedByte() throws IOException {
    int b1 = in.read();
    if (0 > b1) {
      throw new EOFException();
    }

    return b1;
  }

  /**
   * Reads an unsigned {@code short} as specified by {@link DataInputStream#readUnsignedShort()},
   * except using little-endian byte order.
   *
   * @return the next two bytes of the input stream, interpreted as an unsigned 16-bit integer in

	}
}

type errorReader struct {
	reads        [][]byte
	err          error
	panicMessage string
	pause        chan struct{}
}

func (r *errorReader) Read(p []byte) (int, error) {
	if len(r.reads) == 0 {
		if r.pause != nil {
			<-r.pause
		}
		if len(r.panicMessage) != 0 {
			panic(r.panicMessage)
		}
		return 0, r.err
	}
	next := r.reads[0]
	r.reads = r.reads[1:]
	copy(p, next)