osx man page for mpi_comm_delete_attr

MPI_Comm_delete_attr(3OpenMPI)											    MPI_Comm_delete_attr(3OpenMPI)

NAME
       MPI_Comm_delete_attr - Deletes attribute value associated with a key.

SYNTAX
C Syntax
       #include <mpi.h>
       int MPI_Comm_delete_attr(MPI_Comm comm, int comm_keyval)

Fortran Syntax
       INCLUDE 'mpif.h'
       MPI_Comm_delete_attr(COMM, COMM_KEYVAL, IERROR)
	    INTEGER   COMM, COMM_KEYVAL, IERROR

C++ Syntax
       #include <mpi.h>
       void MPI::Comm::Delete_attr(int comm_keyval)

INPUT
/OUTPUT PARAMETER
       comm	 Communicator from which the attribute is deleted (handle).

INPUT PARAMETER
       comm_keyval
		 Key value (integer).

OUTPUT PARAMETER
       IERROR	 Fortran only: Error status (integer).

DESCRIPTION
       MPI_Comm_delete_attr  deletes  an attribute from cache by key. This function invokes the attribute delete function delete_fn specified when
       the comm_keyval was created. The call will fail if the delete_fn function returns an error code other than MPI_SUCCESS.

       Whenever a communicator is replicated using the function MPI_Comm_dup, all callback copy functions for attributes that  are  currently  set
       are  invoked  (in  arbitrary order). Whenever a communicator is deleted using the function MPI_Comm_free, all callback delete functions for
       attributes that are currently set are invoked.

       This function is the same as MPI_Attr_delete but is needed to match the communicator-specific functions introduced in the  MPI-2  standard.
       The use of MPI_Attr_delete is deprecated.

ERRORS
       Almost all MPI routines return an error value; C routines as the value of the function and Fortran routines in the last argument. C++ func-
       tions do not return errors. If the default error handler is set to MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception  mechanism
       will be used to throw an MPI:Exception object.

       Before  the error value is returned, the current MPI error handler is called. By default, this error handler aborts the MPI job, except for
       I/O function errors. The error handler may be changed with MPI_Comm_set_errhandler; 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.

Open MPI 1.2							  September 2006				    MPI_Comm_delete_attr(3OpenMPI)