MPI_Win_shared_query - Query the size and base pointer for a patch of a shared memory window

       All MPI routines (except MPI_Wtime and MPI_Wtick )returnanerrorvalue; 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   (forcommunicators),   MPI_File_set_errhandler   (forfiles),and
       MPI_Win_set_errhandler (for RMA windows).  The MPI-1 routine MPI_Errhandler_set maybeusedbut  its  use
       is  deprecated.   The  predefined error handler MPI_ERRORS_RETURN maybeusedtocauseerrorvaluestobereturned.  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_ERR_ARG
              -  Invalid  argument.   Some  argument  is invalid and is not identified by a specific error class
              (e.g., MPI_ERR_RANK ).MPI_ERR_RANK
              - Invalid source or destination rank.  Ranks must be between zero and the size of the communicator
              minus one; ranks in a receive  (  MPI_Recv  ,  MPI_Irecv  ,  MPI_Sendrecv  ,etc.)mayalsobe
              MPI_ANY_SOURCE .MPI_ERR_WIN
              - Invalid MPI window object
       MPI_ERR_OTHER
              - Other error; use MPI_Error_string togetmoreinformation about this error code.

win    - shared memory window object (handle)
       rank   - rank in the group of window win or MPI_PROC_NULL (non-negative integer)

       MPI_Win_shared_query -  Query the size and base pointer for a patch of a shared memory window

       The  returned  baseptr points to the calling process addressspaceofthe shared segment belonging to the
       target rank.

       All MPI routines in Fortran (except for MPI_WTIME and MPI_WTICK )have an additional argument ierr attheendoftheargumentlist.  ierr isanintegerandhasthesamemeaningasthereturnvalueoftheroutine
       in C.  In Fortran, MPI routines are subroutines, and are invoked with the call statement.

       All MPI objects (e.g., MPI_Datatype , MPI_Comm )areoftype INTEGER inFortran.

size   - size of the window segment (non-negative integer)
       disp_unit
              - local unit size for displacements, in bytes (positive integer)
       baseptr
              - address for load/store access to window segment (choice)

       MPI_Win_allocate_shared

                                                    1/21/2022                            MPI_Win_shared_query(3)

       #ifdef ENABLE_QMPI
       #ifndef MPICH_MPI_FROM_PMPI
       int QMPI_Win_shared_query(QMPI_Context context, int tool_id, MPI_Win win, int rank, MPI_Aint *size,
       int *disp_unit, void *baseptr) 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 orothernon-MPICHruntimeroutinesthatarethemselvesnotinterrupt-safe.