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.TH "MPI_ADD_ERROR_CLASS" "3" "Jul 22, 2024" "" "Open MPI"
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\fI\%MPI_Add_error_class\fP — Creates a new error class and returns its value
.SH SYNTAX
.SS C Syntax
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
#include <mpi.h>

int MPI_Add_error_class(int *errorclass)
.ft P
.fi
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.SS Fortran Syntax
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.INDENT 3.5
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.nf
.ft C
USE MPI
! or the older form: INCLUDE \(aqmpif.h\(aq
MPI_ADD_ERROR_CLASS(ERRORCLASS, IERROR)
     INTEGER ERRORCLASS, IERROR
.ft P
.fi
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.SS Fortran 2008 Syntax
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.INDENT 3.5
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.nf
.ft C
USE mpi_f08
MPI_Add_error_class(errorclass, ierror)
     INTEGER, INTENT(OUT) :: errorclass
     INTEGER, OPTIONAL, INTENT(OUT) :: ierror
.ft P
.fi
.UNINDENT
.UNINDENT
.SH OUTPUT PARAMETERS
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.IP \(bu 2
\fBerrorclass\fP: New error class (integer).
.IP \(bu 2
\fBierror\fP: Fortran only: Error status (integer).
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.SH DESCRIPTION
.sp
The function \fI\%MPI_Add_error_class\fP creates a new, local error class.
.SH NOTES
.sp
Because this function is local, the same value of \fIerrorclass\fP 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 \fIerrorclass\fP to be returned. To reduce the
potential for confusion, \fI\%MPI_Add_error_string\fP may be used on multiple
processes to associate the same error string with the newly created
\fIerrorclass\fP\&. Even though \fIerrorclass\fP may not be consistent across
processes, using \fI\%MPI_Add_error_string\fP will ensure the error string
associated with it will be the same everywhere.
.sp
No function is provided to free error classes, as it is not expected
that an application will create them in significant numbers.
.sp
The value returned is always greater than or equal to MPI_ERR_LASTCODE.
.SH ERRORS
.sp
Almost all MPI routines return an error value; C routines as the return result
of the function and Fortran routines in the last argument.
.sp
Before the error value is returned, the current MPI error handler associated
with the communication object (e.g., communicator, window, file) is called.
If no communication object is associated with the MPI call, then the call is
considered attached to MPI_COMM_SELF and will call the associated MPI error
handler. When MPI_COMM_SELF is not initialized (i.e., before
\fI\%MPI_Init\fP/\fI\%MPI_Init_thread\fP, after \fI\%MPI_Finalize\fP, or when using the Sessions
Model exclusively) the error raises the initial error handler. The initial
error handler can be changed by calling \fI\%MPI_Comm_set_errhandler\fP on
MPI_COMM_SELF when using the World model, or the mpi_initial_errhandler CLI
argument to mpiexec or info key to \fI\%MPI_Comm_spawn\fP/\fI\%MPI_Comm_spawn_multiple\fP\&.
If no other appropriate error handler has been set, then the MPI_ERRORS_RETURN
error handler is called for MPI I/O functions and the MPI_ERRORS_ABORT error
handler is called for all other MPI functions.
.sp
Open MPI includes three predefined error handlers that can be used:
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.IP \(bu 2
\fBMPI_ERRORS_ARE_FATAL\fP
Causes the program to abort all connected MPI processes.
.IP \(bu 2
\fBMPI_ERRORS_ABORT\fP
An error handler that can be invoked on a communicator,
window, file, or session. When called on a communicator, it
acts as if \fI\%MPI_Abort\fP was called on that communicator. If
called on a window or file, acts as if \fI\%MPI_Abort\fP was called
on a communicator containing the group of processes in the
corresponding window or file. If called on a session,
aborts only the local process.
.IP \(bu 2
\fBMPI_ERRORS_RETURN\fP
Returns an error code to the application.
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MPI applications can also implement their own error handlers by calling:
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.IP \(bu 2
\fI\%MPI_Comm_create_errhandler\fP then \fI\%MPI_Comm_set_errhandler\fP
.IP \(bu 2
\fI\%MPI_File_create_errhandler\fP then \fI\%MPI_File_set_errhandler\fP
.IP \(bu 2
\fI\%MPI_Session_create_errhandler\fP then \fI\%MPI_Session_set_errhandler\fP or at \fI\%MPI_Session_init\fP
.IP \(bu 2
\fI\%MPI_Win_create_errhandler\fP then \fI\%MPI_Win_set_errhandler\fP
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.sp
Note that MPI does not guarantee that an MPI program can continue past
an error.
.sp
See the \fI\%MPI man page\fP for a full list of \fI\%MPI error codes\fP\&.
.sp
See the Error Handling section of the MPI\-3.1 standard for
more information.
.sp
\fBSEE ALSO:\fP
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.INDENT 3.5
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.IP \(bu 2
\fI\%MPI_Add_error_code\fP
.IP \(bu 2
\fI\%MPI_Add_error_string\fP
.IP \(bu 2
\fI\%MPI_Error_class\fP
.IP \(bu 2
\fI\%MPI_Error_string\fP
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.SH COPYRIGHT
2003-2024, The Open MPI Community
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