C Syntax

       2003-2025, The Open MPI Community

                                                  Jun 07, 2025                               MPI_T_CVAR_WRITE(3)

MPI_T_cvar_write  sets  the  value the control variable identified by the handle specified in handle from
       the buffer provided in buf. The caller must ensure that the buffer specified in buf is  large  enough  to
       hold  the  entire value of the control variable. If the variable has global scope, any write call must be
       issued on all connected MPI processes. For more information see MPI-3 section 14.3.6.

MPI_T_cvar_write will fail if:

       • MPI_T_ERR_NOT_INITIALIZED: The MPI Tools interface not initialized

       • MPI_T_ERR_INVALID_HANDLE: The handle is invalid

       • MPI_T_ERR_CVAR_SET_NOT_NOW: Variable cannot be set at this moment

       • MPI_T_ERR_CVAR_SET_NEVER: Variable cannot be set until end of execution

       SEEALSO:

          • MPI_T_cvar_handle_alloc

          • MPI_T_cvar_get_info

       • handle: Handle of the control variable to be written.

       • buf: Initial address of storage location for variable value.

CSyntax
          #include <mpi.h>

          int MPI_T_cvar_write(MPI_T_cvar_handle handle, const void *buf)