MPI_Type_get_name(3)

NAME
MPI_Type_get_name - Gets the print name for a datatype

SYNOPSIS
int MPI_Type_get_name(MPI_Datatype datatype, char *type_name, int *resultlen)

INPUT PARAMETER
type
    - datatype whose name is to be returned (handle)

OUTPUT PARAMETERS
type_name
    - the name previously stored on the datatype, or a empty string if no such name exists (string)
resultlen
    - length of returned name (integer)

THREAD AND INTERRUPT SAFETY
This routine is thread-safe and interrupt-safe only if no MPI routine that updates or frees the same MPI object may be called concurrently with this routine. The MPI standard defined a thread-safe interface, but this does not mean that all routines may be called without any thread locks. For example, two threads must not attempt to change the contents of the same MPI_Info object concurrently. In this case, use some mechanism, such as thread locks, to ensure that only one thread at a time makes use of this routine.

NULL HANDLES
The MPI 1.1 specification, in the section on opaque objects, explicitly disallows freeing a null communicator. The text from the standard is:
A null handle argument is an erroneous IN argument in MPI calls, unless an
exception is explicitly stated in the text that defines the function. Such
exception is allowed for handles to request objects in Wait and Test calls
(sections Communication Completion and Multiple Completions ). Otherwise, a
null handle can only be passed to a function that allocates a new object and
returns a reference to it in the handle.

NOTES FOR FORTRAN
All MPI routines in Fortran (except MPI_WTIME and MPI_WTICK ) have an additional argument ierr at the end of the argument list. ierr is an integer and has the same meaning as the return value of the routine in C. In Fortran, MPI routines are subroutines, and are invoked with the call statement. All MPI objects (for example, MPI_Datatype , MPI_Comm ) are of type INTEGER in Fortran.

ERRORS
All MPI routines (except MPI_Wtime and MPI_Wtick ) return an error value; C routines as the value of the function and Fortran routines in the last argument. Before the value is returned, the current MPI error handler is called. By default, this error handler aborts the MPI job. The error handler may be changed with MPI_Comm_set_errhandler (for communicators), MPI_File_set_errhandler (for files), and MPI_Win_set_errhandler (for RMA windows). The MPI-1 routine MPI_Errhandler_set may be used but its use is deprecated. The predefined error handler MPI_ERRORS_RETURN may be used to cause error values to be returned. Note that MPI does not guarantee that an MPI program can continue past an error; however, MPI implementations will attempt to continue whenever possible.
MPI_SUCCESS
    - No error; MPI routine completed successfully.
MPI_ERR_TYPE
    - Invalid datatype argument. Additionally, this error can occur if an uncommitted MPI_Datatype (see MPI_Type_commit ) is used in a communication call.
MPI_ERR_ARG
    - Invalid argument. Some argument is invalid and is not identified by a specific error class (for example, MPI_ERR_RANK ).

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