#include "mpi.h" int MPI_Attr_put ( comm, keyval, attr_value ) MPI_Comm comm; int keyval; void *attr_value;
|comm||communicator to which attribute will be attached (handle)
|keyval||key value, as returned by MPI_KEYVAL_CREATE (integer)
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 singleinteger (not a pointer, since Fortran has no pointers and there are systemsfor which a pointer does not fit in an integer (e.g., any > 32 bit addresssystem that uses 64 bits for Fortran DOUBLE PRECISION).
If an attribute is already present, the delete function (specified when thecorresponding keyval was created) will be called.
All MPI objects (e.g., MPI_Datatype, MPI_Comm) are of type INTEGERin 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 lastargument. Before the value is returned, the current MPI error handler iscalled. By default, this error handler aborts the MPI job. The error handlermay be changed with MPI_Errhandler_set; the predefined error handlerMPI_ERRORS_RETURN may be used to cause error values to be returned. Note that MPI does not guarentee that an MPI program can continue pastan error.