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.TH "MPI_T_CVAR_HANDLE_ALLOC" "3" "Jul 06, 2026" "" "Open MPI"
.sp
MPI_T_cvar_handle_alloc, MPI_T_cvar_handle_free \%<#\:mpi-t-cvar-handle-free> \- Allocate/free
control variable handles
.SH SYNTAX
.SS C Syntax
.INDENT 0.0
.INDENT 3.5
.sp
.EX
#include <mpi.h>

int MPI_T_cvar_handle_alloc(int cvar_index, void *obj_handle,
                            MPI_T_cvar_handle *handle, int *count)

int MPI_T_cvar_handle_free(MPI_T_cvar_handle *handle)
.EE
.UNINDENT
.UNINDENT
.SH DESCRIPTION
.sp
MPI_T_cvar_handle_alloc binds the control variable specified in
\fIcvar_index\fP to the MPI object specified in \fIobj_handle\fP\&. If
MPI_T_cvar_get_info \%<#\:mpi-t-cvar-get-info> returns MPI_T_BIND_NO_OBJECT as the binding of the
variable the \fIobj_handle\fP argument is ignored. The number of values
represented by this control variable is returned in the \fIcount\fP
parameter. If the control variable represents a string then \fIcount\fP will
be the maximum length of the string.
.sp
MPI_T_cvar_handle_free \%<#\:mpi-t-cvar-handle-free> frees a handle allocated by
MPI_T_cvar_handle_alloc and sets the \fIhandle\fP argument to
MPI_T_CVAR_HANDLE_NULL.
.SH NOTES
.sp
Open MPI does not currently support binding MPI objects to control
variables so the \fIobj_handle\fP argument is always ignored.
.SH ERRORS
.sp
MPI_T_cvar_handle_alloc will fail if:
.INDENT 0.0
.IP \(bu 2
\fBMPI_T_ERR_NOT_INITIALIZED\fP: The MPI Tools interface not initialized
.IP \(bu 2
\fBMPI_T_ERR_INVALID_INDEX\fP: The control variable index is invalid
.IP \(bu 2
\fBMPI_T_ERR_OUT_OF_HANDLES\fP: No more handles available
.UNINDENT
.sp
MPI_T_cvar_handle_free \%<#\:mpi-t-cvar-handle-free> will fail if:
.INDENT 0.0
.IP \(bu 2
\fBMPI_T_ERR_NOT_INITIALIZED\fP: The MPI Tools interface not initialized
.IP \(bu 2
\fBMPI_T_ERR_INVALID_HANDLE\fP: The handle is invalid
.UNINDENT
.sp
\fBSee also:\fP
.INDENT 0.0
.INDENT 3.5
.INDENT 0.0
.IP \(bu 2
MPI_T_cvar_get_info \%<#\:mpi-t-cvar-get-info>
.UNINDENT
.UNINDENT
.UNINDENT
.SH Copyright
2003-2026, The Open MPI Community
.\" End of generated man page.