.TH MPIO_Test 3 "2/5/1998" " " "MPI-2".SH NAMEMPIO_Test \-  Test the completion of a nonblocking read or write .SH SYNOPSIS.nf#include "mpi.h"int MPIO_Test(MPIO_Request *request, int *flag, MPI_Status *status).fi.SH INPUT PARAMETERS.PD 0.TP.B request - request object (handle).PD 1.SH OUTPUT PARAMETERS.PD 0.TP.B flag - true if operation completed (logical).PD 1.PD 0.TP.B status - status object (Status).PD 1.SH NOTES FOR FORTRANAll MPI routines in Fortran (except for 'MPI_WTIME' and 'MPI_WTICK')have an additional argument 'ierr' at the end of the argument list.'ierr' is an integer and has the same meaning as the return value ofthe routine in C.  In Fortran, MPI routines are subroutines and areinvoked with the 'call' statement.All MPI objects (e.g., 'MPI_Datatype', 'MPI_Comm', 'MPI_File') are oftype 'INTEGER' in Fortran.