MPIFilewriteatallbegin(3OpenMPI) MPIFilewriteatallbegin(3OpenMPI)

NAME
       MMPPIIFFiilleewwrriitteeaattaallllbbeeggiinn  -  Writes  a  file at explicitly specified
       offsets; beginning part of a split collective routine (nonblocking).


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

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


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


IINNPPUUTT//OOUUTTPPUUTT PPAARRAAMMEETTEERR
       fh        File handle (handle).


IINNPPUUTT PPAARRAAMMEETTEERRSS
       offset    File offset (handle).

       buf       Initial address of buffer (choice).

       count     Number of elements in buffer (integer).

       datatype  Data type of each buffer element (handle).


OOUUTTPPUUTT PPAARRAAMMEETTEERR
       IERROR    Fortran only: Error status (integer).


DESCRIPTION
       MPIFilewriteatallbegin is the beginning part of  a  split  collec-
       tive,  that  is,  a nonblocking routine that attempts to write into the
       file associated with fh (at the offset  position)  a  total  number  of
       count  data items having datatype type from 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 written into those
       parts of the file specified by the current view.


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-porta-
       ble syntax

            INTEGER*MPIOFFSETKIND OFFSET

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


NNOOTTEESS
       All  the  nonblocking  collective  routines for data access are "split"
       into two routines, each with begin or end as a  suffix.  These  split
       collective routines are subject to the semantic rules described in Sec-
       tion 9.4.5 of the MPI-2 standard.


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                    SeptemberM2P0I06Filewriteatallbegin(3OpenMPI)