MPI_Comm_create_errhandler creates an error handler that can be attached to communicators. This function is identical to MPI_Errhandler_create, the use of which is deprecated.
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In C, the user routine should be a function of type MPI_Comm_errhandler_fn, which is defined as
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typedef void MPI_Comm_errhandler_fn(MPI_Comm *, int *, \&...);
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The first argument is the communicator in use. The second is the error code
to be returned by the MPI routine that raised the error. This typedef replaces MPI_Handler_function, the use of which is deprecated.
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In Fortran, the user routine should be of this form:
typedef void MPI::Comm::Errhandler_fn(MPI_Comm &, int *, \&...);
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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.
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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.