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NAME

MPI_Attr_put - Associate an attribute to a keyval for a communicator

SYNOPSIS

#include <mpi.h> int MPI_Attr_put(MPI_Comm comm , int keyval , void *attr );

#include <pmpi.h> int PMPI_Attr_put(MPI_Comm comm , int keyval , void *attr );

INCLUDE 'mpif.h' MPI_ATTR_PUT(comm , keyval , attr , ierr ) INTEGER comm , keyval , attr , ierr

INPUT PARAMETERS

comm - communicator (handle)

keyval - key value (handle)

attr - attribute (void pointer in C, integer in FORTRAN)

DESCRIPTION

The MPI_Attr_put() function is used to associate an attribute, attr with a keyval for a given communicator, comm . The attribute may later be retrieved with the MPI_Attr_get() function, and deleted with the MPI_Attr_delete() function.

The behaviour of attributes under the copying or deleting of communicators is defined by the keyval in MPI_Keyval_create().

PMPI_Attr_put() is the profiling version of this function.

ERRORS

All MPI routines except for MPI_Wtime and MPI_Wtick return an error code. The the current MPI error handler is invoked if the return value is not MPI_SUCCESS. The default error handler aborts, but this may be changed with by using the MPI_Errhandler_set() function. The predefined error handler MPI_ERRORS_RETURN may be used to cause error values to be returned instead. Note that MPI does not guarentee that an MPI program can continue past an error. In this implementation, all errors except MPI_ERR_INTERN or MPI_ERR_OTHER should always be recoverable.

In C, the error code is passed as the return value. In FORTRAN, all functions have an parameter ierr which returns the error code. MPI C++ functions do not directly return an error code. However, C++ users may want to use the MPI::ERRORS_THROW_EXCEPTIONS handler. This will throw an MPI::Exception with the corresponding error code. To prevent exceptions from being raised from within C and Fortran code, they will see all error return values as MPI_ERR_PENDING when this handler is chosen. In this implementation, call MPI::throw_exception() to throw the correct exception if this occurs.

MPI_SUCCESS - No error;

MPI_ERR_PENDING - Pending exception;

MPI_ERR_COMM - Invalid communicator;

MPI_ERR_KEYVAL - Invalid keyval;

MPI_ERR_INTERN - Out of memory error.

SEE ALSO

MPI_Keyval_create (3) MPI_Keyval_free (3) MPI_Attr_get (3) MPI_Attr_delete (3)

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