NAME

       MPI_Add_error_class - Creates a new error class and returns its value

SYNTAX

C Syntax

       #include <mpi.h>
       int MPI_Add_error_class(int *errorclass)

Fortran Syntax

       INCLUDE 'mpif.h'
       MPI_ADD_ERROR_CLASS(ERRORCLASS, IERROR)
            INTEGER   ERRORCLASS, IERROR

C++ Syntax

       #include <mpi.h>
       int MPI::Add_error_class()

OUTPUT PARAMETERS

       errorclass    New error class (integer).

       IERROR        Fortran only: Error status (integer).

DESCRIPTION

       The function MPI_Add_error_class creates a new, local error class.

NOTES

       Because  this  function  is local, the same value of errorclass may not be returned on all
       processes that make this call, even if they call the  function  concurrently.  Thus,  same
       error on different processes may not cause the same value of errorclass to be returned. To
       reduce the potential for confusion, MPI_Add_error_string may be used on multiple processes
       to  associate  the  same  error  string  with  the  newly  created errorclass. Even though
       errorclass may not be consistent across processes, using MPI_Add_error_string will  ensure
       the error string associated with it will be the same everywhere.

       No  function  is provided to free error classes, as it is not expected that an application
       will create them in significant numbers.

       The value returned is always greater than or equal to MPI_ERR_LASTCODE.

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++ functions 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.

SEE ALSO

       MPI_Add_error_code
       MPI_Add_error_string
       MPI_Error_class
       MPI_Error_string