MPI_T_pvar_get_info - Get the information about a performance variable

       All MPI routines (except MPI_Wtime and MPI_Wtick ) return an error value; C routines as the value of  the
       function  and Fortran routines in the last argument.  Before the value is returned, the current MPI error
       handler is called.  By default, this error handler aborts the MPI job.  The error handler may be  changed
       with    MPI_Comm_set_errhandler   (for   communicators),   MPI_File_set_errhandler   (for   files),   and
       MPI_Win_set_errhandler (for RMA windows).  The MPI-1 routine MPI_Errhandler_set may be used but  its  use
       is  deprecated.   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; however,  MPI
       implementations will attempt to continue whenever possible.

       MPI_SUCCESS
              - No error; MPI routine completed successfully.

       MPI_T_ERR_INVALID_INDEX
              - Index is invalid or has been deleted.
       MPI_T_ERR_NOT_INITIALIZED
              - The MPI tool information interface is not initialized.
       MPI_ERR_OTHER
              - Other error; use MPI_Error_string to get more information about this error code.

                                                    1/21/2022                             MPI_T_pvar_get_info(3)

pvar_index
              - index of the performance variable to be queried between $0$ and $num_pvar-1$ (integer)

name_len
              - length of the string and/or buffer for name (integer)
       desc_len
              - length of the string and/or buffer for desc (integer)

       MPI_T_pvar_get_info -  Get the information about a performance variable

name   - buffer to return the string containing the name of the performance variable (string)
       verbosity
              - verbosity level of this variable (integer)
       var_class
              - class of performance variable (integer)
       datatype
              - mpi datatype of the information stored in the performance variable (handle)
       enumtype
              - optional descriptor for enumeration information (handle)
       desc   - buffer to return the string containing a description of the performance variable (string)
       bind   - type of mpi object to which this variable must be bound (integer)
       readonly
              - flag indicating whether the variable can be written/reset (integer)
       continuous
              -  flag  indicating  whether  the  variable  can  be started and stopped or is continuously active
              (integer)
       atomic - flag indicating whether the variable can be atomically read and reset (integer)

       #ifdef ENABLE_QMPI
       #ifndef MPICH_MPI_FROM_PMPI
       int QMPI_T_pvar_get_info(QMPI_Context context, int tool_id, int pvar_index, char *name,
       int *name_len, int *verbosity, int *var_class, MPI_Datatype *datatype,
       MPI_T_enum *enumtype, char *desc, int *desc_len, int *bind, int *readonly,
       int *continuous, int *atomic) MPICH_API_PUBLIC

       This routine is thread-safe.  This means that this routine may be safely used by multiple threads without
       the need for any user-provided thread locks.  However, the routine is  not  interrupt  safe.   Typically,
       this  is  due to the use of memory allocation routines such as malloc or other non-MPICH runtime routines
       that are themselves not interrupt-safe.