SYNTAX

   C Syntax
          #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)

DESCRIPTION

       MPI_T_cvar_handle_alloc binds the control variable specified in cvar_index to the MPI object specified in
       obj_handle.  If  MPI_T_cvar_get_info  returns  MPI_T_BIND_NO_OBJECT  as  the  binding of the variable the
       obj_handle argument is ignored. The number of values represented by this control variable is returned  in
       the count parameter. If the control variable represents a string then count will be the maximum length of
       the string.

       MPI_T_cvar_handle_free  frees  a handle allocated by MPI_T_cvar_handle_alloc and sets the handle argument
       to MPI_T_CVAR_HANDLE_NULL.

NOTES

       Open MPI does not currently support binding MPI objects to control variables so the  obj_handle  argument
       is always ignored.

ERRORS

       MPI_T_cvar_handle_alloc will fail if:

       • MPI_T_ERR_NOT_INITIALIZED: The MPI Tools interface not initialized

       • MPI_T_ERR_INVALID_INDEX: The control variable index is invalid

       • MPI_T_ERR_OUT_OF_HANDLES: No more handles available

       MPI_T_cvar_handle_free will fail if:

       • MPI_T_ERR_NOT_INITIALIZED: The MPI Tools interface not initialized

       • MPI_T_ERR_INVALID_HANDLE: The handle is invalid

       SEE ALSO:

          • MPI_T_cvar_get_info

COPYRIGHT

       2003-2025, The Open MPI Community

                                                  Sep 06, 2025                         MPI_T_CVAR_HANDLE_FREE(3)