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.\" Man page generated from reStructuredText.
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.TH "MPI_COMM_DELETE_ATTR" "3" "May 30, 2025" "" "Open MPI"
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.sp
\fI\%MPI_Comm_delete_attr\fP — Deletes attribute value associated with a
key.
.SH SYNTAX
.SS C Syntax
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
#include <mpi.h>
int MPI_Comm_delete_attr(MPI_Comm comm, int comm_keyval)
.ft P
.fi
.UNINDENT
.UNINDENT
.SS Fortran Syntax
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
USE MPI
! or the older form: INCLUDE \(aqmpif.h\(aq
MPI_COMM_DELETE_ATTR(COMM, COMM_KEYVAL, IERROR)
INTEGER COMM, COMM_KEYVAL, IERROR
.ft P
.fi
.UNINDENT
.UNINDENT
.SS Fortran 2008 Syntax
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
USE mpi_f08
MPI_Comm_delete_attr(comm, comm_keyval, ierror)
TYPE(MPI_Comm), INTENT(IN) :: comm
INTEGER, INTENT(IN) :: comm_keyval
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
.ft P
.fi
.UNINDENT
.UNINDENT
.SS INPUT/OUTPUT PARAMETER
.INDENT 0.0
.IP \(bu 2
\fBcomm\fP : Communicator from which the attribute is deleted (handle).
.UNINDENT
.SH INPUT PARAMETER
.INDENT 0.0
.IP \(bu 2
\fBcomm_keyval\fP : Key value (integer).
.UNINDENT
.SH OUTPUT PARAMETER
.INDENT 0.0
.IP \(bu 2
\fBierror\fP : Fortran only: Error status (integer).
.UNINDENT
.SH DESCRIPTION
.sp
\fI\%MPI_Comm_delete_attr\fP deletes an attribute from cache by key. This
function invokes the attribute delete function \fBdelete_fn\fP specified
when the \fBcomm_keyval\fP was created. The call will fail if the
\fBdelete_fn\fP function returns an error code other than \fBMPI_SUCCESS\fP\&.
.sp
Whenever a communicator is replicated using the function
\fI\%MPI_Comm_dup\fP, all callback copy functions for attributes that are
currently set are invoked (in arbitrary order). Whenever a communicator
is deleted using the function \fI\%MPI_Comm_free\fP, all callback delete
functions for attributes that are currently set are invoked. This
function is the same as \fI\%MPI_Attr_delete\fP but is needed to match the
\fBcomm\fPunicator\-specific functions introduced in the MPI\-2 standard.
The use of \fI\%MPI_Attr_delete\fP is deprecated.
.SH NOTES
.sp
Note that it is not defined by the MPI standard what happens if the
\fBdelete_fn\fP callback invokes other MPI functions. In Open MPI, it is
not valid for \fBdelete_fn\fP callbacks (or any of their children) to add
or delete attributes on the same object on which the \fBdelete_fn\fP
callback is being invoked.
.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:
.INDENT 0.0
.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.
.UNINDENT
.sp
MPI applications can also implement their own error handlers by calling:
.INDENT 0.0
.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
.UNINDENT
.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.
.SH COPYRIGHT
2003-2025, The Open MPI Community
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