osx man page for mpi_comm_compare

MPI_Comm_compare(3OpenMPI)												MPI_Comm_compare(3OpenMPI)

NAME
       MPI_Comm_compare  -  Compares two communicators.

SYNTAX
C Syntax
       #include <mpi.h>
       int MPI_Comm_compare(MPI_Comm comm1, MPI_Comm comm2, int *result)

Fortran Syntax
       INCLUDE 'mpif.h'
       MPI_COMM_COMPARE(COMM1, COMM2, RESULT, IERROR)
	    INTEGER   COMM1, COMM2, RESULT, IERROR

C++ Syntax
       #include <mpi.h>
       static int Comm::Compare(const Comm& comm1, const Comm& comm2)

INPUT PARAMETERS
       comm1	 Comm1 (handle).

       comm2	 Comm2 (handle).

OUTPUT PARAMETERS
       result	 Result of comparison (integer).

       IERROR	 Fortran only: Error status (integer).

DESCRIPTION
       MPI_IDENT  results  if  and  only  if  comm1  and comm2 are handles for the same object (identical groups and same contexts). MPI_CONGRUENT
       results if the underlying groups are identical in constituents and rank order; these communicators  differ  only  by  context.  MPI_SIMILAR
       results of the group members of both communicators are the same but the rank order differs. MPI_UNEQUAL results otherwise.

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_compare(3OpenMPI)