MPIFilereadatall(3OpenMPI) MPIFilereadatall(3OpenMPI)

NAME
       MMPPIIFFiilleerreeaaddaattaallll  -  Reads  a  file at explicitly specified offsets
       (blocking, collective).


SSYYNNTTAAXX
       C Syntax
           #include 
           int MPIFilereadatall(MPIFile fh, MPIOffset offset,
            void *buf, int count, MPIDatatype datatype,
            MPIStatus *status)

       Fortran Syntax (see FORTRAN 77 NOTES)
           INCLUDE 'mpif.h'
           MPIFILEREADATALL(FH,  OFFSET,  BUF, COUNT,
                   DATATYPE, STATUS,  IERROR)
              BUF(*)
             INTEGER FH, COUNT, DATATYPE, STATUS(MPISTATUSSIZE), IERROR
             INTEGER(KIND=MPIOFFSETKIND) OFFSET


CC++++ SSyynnttaaxx
       #include 
       void MPI::File::Readatall(MPI::Offset offset, void* buf,
            int count, const MPI::Datatype& datatype, MPI::Status& status)

       void MPI::File::Readatall(MPI::Offset offset, void* buf,
            int count, const MPI::Datatype& datatype)


IINNPPUUTT PPAARRAAMMEETTEERRSS
       fh        File handle (handle).

       offset    File offset (integer).

       count     Number of elements in buffer (integer).

       datatype  Data type of each buffer element (handle).


OOUUTTPPUUTT PPAARRAAMMEETTEERRSS
       buf       Initial address of buffer (choice).

       status    Status object (status).

       IERROR    Fortran only: Error status (integer).


DESCRIPTION
       MPIFilereadatall is a collective routine that attempts to read from
       the  file associated with fh (at the offset position) a total number of
       count data items having datatype type into the user's buffer buf.   The
       offset  is  in etype units relative to the current view. That is, holes
       are not counted when locating an offset. The data is taken out of those
       parts  of  the file specified by the current view. MPIFilereadatall
       stores the number of datatype elements actually read  in  status.   All
       other  fields  of  status  are  undefined. It is erroneous to call this
       function if MPIMODESEQUENTIAL mode was specified when  the  file  was
       opened.


FFOORRTTRRAANN 7777 NNOOTTEESS
       The  MPI  standard  prescribes  portable  Fortran syntax for the OFFSET
       argument only for Fortran 90. FORTRAN 77 users may use the non-portable
       syntax

            INTEGER*MPIOFFSETKIND OFFSET

       where  MPIOFFSETKIND  is  a  constant defined in mpif.h and gives the
       length of the declared integer in bytes.


EERRRROORRSS
       Almost all MPI routines return an error value; C routines as the  value
       of  the  function  and Fortran routines in the last argument. C++ func-
       tions do not return errors. If the default  error  handler  is  set  to
       MPI::ERRORSTHROWEXCEPTIONS, 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  MPIERRORSRETURN.  The  error  handler   may   be   changed   with
       MPIFileseterrhandler;      the      predefined     error     handler
       MPIERRORSAREFATAL may be used to make I/O errors  fatal.  Note  that
       MPI  does not guarantee that an MPI program can continue past an error.




Open MPI 1.2                    September 2006  MPIFilereadatall(3OpenMPI)