Stores attribute value associated with a key


#include "mpi.h"
int MPI_Attr_put ( MPI_Comm comm, int keyval, void *attr_value )

Input Parameters

comm communicator to which attribute will be attached (handle)
keyval key value, as returned by MPI_KEYVAL_CREATE (integer)
attribute_val attribute value


Values of the permanent attributes MPI_TAG_UB, MPI_HOST, MPI_IO, and MPI_WTIME_IS_GLOBAL may not be changed.

The type of the attribute value depends on whether C or Fortran is being used. In C, an attribute value is a pointer (void *); in Fortran, it is a single integer (not a pointer, since Fortran has no pointers and there are systems for which a pointer does not fit in an integer (e.g., any > 32 bit address system that uses 64 bits for Fortran DOUBLE PRECISION).

If an attribute is already present, the delete function (specified when the corresponding keyval was created) will be called.

Notes for Fortran

All 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.


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_Errhandler_set; 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.

No error; MPI routine completed successfully.
Invalid communicator. A common error is to use a null communicator in a call (not even allowed in MPI_Comm_rank).
Other error; the error code associated with this error indicates an attempt to use an invalue keyval.
This error class is associated with an error code that indicates that an attempt was made to free one of the permanent keys.

See Also

MPI_Attr_get, MPI_Keyval_create, MPI_Attr_delete