Last modified: 18 August 2010
Name: H5Tlock
Signature:
  herr_t `H5Tlock`( hid_t `dtype_id` )

Purpose:
  Locks a datatype.

Description:
  `H5Tlock` locks the datatype specified by the `dtype_id` identifier, making it read-only and non-destructible. This is normally done by the library for predefined datatypes so the application does not inadvertently change or delete a predefined type. Once a datatype is locked it can never be unlocked.

Parameters:

  hid_t `dtype_id` | IN: Identifier of datatype to lock.

Returns:
  Returns a non-negative value if successful; otherwise returns a negative value.

Fortran90 Interface:
  None.