.\" Copyright 2010 Cisco Systems, Inc.  All rights reserved.
.\" Copyright 2006-2008 Sun Microsystems, Inc.
.\" Copyright (c) 1996 Thinking Machines Corporation
.TH MPI_Attr_delete 3 "#OMPI_DATE#" "#PACKAGE_VERSION#" "#PACKAGE_NAME#"
.SH NAME
\fBMPI_Attr_delete\fP \- Deletes attribute value associated with a key -- use of this routine is deprecated.

.SH SYNTAX
.ft R
.SH C Syntax
.nf
#include <mpi.h>
int MPI_Attr_delete(MPI_Comm\fI comm\fP, int\fI keyval\fP)

.fi
.SH Fortran Syntax
.nf
INCLUDE 'mpif.h'
MPI_ATTR_DELETE(\fICOMM\fP,\fI KEYVAL\fP, \fIIERROR\fP)			
	INTEGER	\fICOMM\fP,\fI KEYVAL\fP,\fI IERROR\fP


.fi
.SH Java Syntax
.nf
import mpi.*;
int MPI.COMM_WORLD.Attr_delete(MPI.\fIkeyval\fP)

.fi
.SH INPUT PARAMETERS
.ft R
.TP 1i
comm
Communicator to which attribute is attached (handle).
.TP 1i
keyval
The key value of the deleted attribute (integer).

.SH OUTPUT PARAMETER
.ft R
.TP 1i
IERROR
Fortran only: Error status (integer). 

.SH DESCRIPTION
This deprecated routine is not available in C++. 
.sp
Note that use of this routine is \fIdeprecated\fP as of MPI-2. Please use MPI_Comm_delete_attr. 
.sp
Delete attribute from cache by key. This function invokes the attribute delete function delete_fn specified when the 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. 

.SH 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.
.sp
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.  

.SH SEE ALSO
MPI_Comm_delete_attr
.br