oracular (3) MPI_File_iread_all.openmpi.3.gz

NAME

       MPI_File_iread_all  -  Reads  a  file  starting  at the location specified by the individual file pointer
       (nonblocking, collective).

SYNTAX

C Syntax

       #include <mpi.h>
       int MPI_File_iread_all(MPI_File fh, void  *buf, int  count,
            MPI_Datatype  datatype, MPI_Request  *request)

Fortran Syntax

       USE MPI
       ! or the older form: INCLUDE 'mpif.h'
       MPI_FILE_IREAD_ALL(FH, BUF, COUNT, DATATYPE, REQUEST, IERROR)
            <type>    BUF(*)
            INTEGER   FH, COUNT, DATATYPE, REQUEST, IERROR

Fortran 2008 Syntax

       USE mpi_f08
       MPI_File_iread_all(fh, buf, count, datatype, request, ierror)
            TYPE(MPI_File), INTENT(IN) :: fh
            TYPE(*), DIMENSION(..) :: buf
            INTEGER, INTENT(IN) :: count
            TYPE(MPI_Datatype), INTENT(IN) :: datatype
            TYPE(MPI_Request), INTENT(OUT) :: request
            INTEGER, OPTIONAL, INTENT(OUT) :: ierror

INPUT/OUTPUT PARAMETER

       fh        File handle (handle).

INPUT PARAMETERS

       count     Number of elements in the buffer (integer).

       datatype  Data type of each buffer element (handle).

OUTPUT PARAMETERS

       buf       Initial address of buffer (choice).

       request   Request object (handle).

       IERROR    Fortran only: Error status (integer).

DESCRIPTION

       MPI_File_iread_all is a nonblocking version of MPI_File_read_all. It  attempts  to  read  from  the  file
       associated  with  fh  at the current individual file pointer position maintained by the system in which a
       total number of count data items having datatype type  are read into the user's buffer buf.  The data  is
       taken  out of those parts of the file specified by the current view. MPI_File_iread_all stores the number
       of data-type elements actually read in status.  All other fields of status are undefined. It is erroneous
       to call this function if MPI_MODE_SEQUENTIAL mode was specified when the file was opened.

ERRORS

       Almost  all  MPI  routines  return  an  error  value; C routines as the value of the function and Fortran
       routines in the last argument. C++ functions do not return errors. If the default error handler is set to
       MPI::ERRORS_THROW_EXCEPTIONS,  then  on  error  the  C++  exception  mechanism  will  be used to throw an
       MPI::Exception object.

       Before the error value is returned, the current MPI error handler is called. For MPI I/O function errors,
       the  default  error  handler  is  set  to  MPI_ERRORS_RETURN.  The  error  handler  may  be  changed with
       MPI_File_set_errhandler; the predefined error handler MPI_ERRORS_ARE_FATAL may be used to make I/O errors
       fatal. Note that MPI does not guarantee that an MPI program can continue past an error.