MPI_Type_hindexedCreates an indexed datatype with offsets in bytes
int MPI_Type_hindexed( int count, int blocklens, MPI_Aint indices, MPI_Datatype old_type, MPI_Datatype *newtype );
- [in] number of blocks -- also number of entries in indices and blocklens
- [in] number of elements in each block (array of nonnegative integers)
- [in] byte displacement of each block (array of MPI_Aint)
- [in] old datatype (handle)
- [out] new datatype (handle)
Deprecated FunctionThe MPI-2 standard deprecated a number of routines because MPI-2 provides better versions. This routine is one of those that was deprecated. The routine may continue to be used, but new code should use the replacement routine. This routine is replaced by MPI_Type_create_hindexed.
Thread and Interrupt Safety
This routine is thread-safe. This means that this routine may be safely used by multiple threads without the need for any user-provided thread locks. However, the routine is not interrupt safe. Typically, this is due to the use of memory allocation routines such as malloc or other non-MPICH runtime routines that are themselves not interrupt-safe.
Notes for FortranAll MPI routines in Fortran (except for 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 (e.g., MPI_Datatype, MPI_Comm) are of type INTEGER in Fortran.
The indices are displacements, and are based on a zero origin. A common error
is to do something like to following
integer blens(10), indices(10)
blens(i) = 1
10 indices(i) = (1 + (i-1)*10) * sizeofint
expecting this to send a(1),a(11),... because the indices have values
1,11,.... Because these are displacements from the beginning of a,
it actually sends a(1+1),a(1+11),....
If you wish to consider the displacements as indices into a Fortran array,
consider declaring the Fortran array with a zero origin
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 guarentee that an MPI program can continue past an error; however, MPI implementations will attempt to continue whenever possible.
- No error; MPI routine completed successfully.
- Invalid datatype argument. May be an uncommitted MPI_Datatype (see MPI_Type_commit).
- Invalid count argument. Count arguments must be non-negative; a count of zero is often valid.
- This error is returned when some part of the MPICH implementation is unable to acquire memory.
- Invalid argument. Some argument is invalid and is not identified by a specific error class (e.g., MPI_ERR_RANK).
This function has been deprecated. Please see MPI_Type_create_hindexed for a replacement.