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MPI_File_read_all_begin(3OpenMPI)                                          MPI_File_read_all_begin(3OpenMPI)



NAME
       MPI_File_read_all_begin  - Reads a file starting at the locations specified by individual file point-ers; pointers;
       ers; beginning part of a split collective routine (nonblocking).


SYNTAX
       C Syntax
           #include <mpi.h>
           int MPI_File_read_all_begin(MPI_File fh, void *buf,
                  int count, MPI_Datatype datatype)

       Fortran Syntax
           INCLUDE 'mpif.h'
           MPI_FILE_READ_ALL_BEGIN(FH, BUF, COUNT, DATATYPE, IERROR)
                 <TYPE>         BUF(*)
                 INTEGER        FH, COUNT, DATATYPE, IERROR


C++ Syntax
       #include <mpi.h>
       void MPI::File::Read_all_begin(void* buf, int count,
            const MPI::Datatype& datatype)


INPUT/OUTPUT PARAMETER
       fh        File handle (handle).


INPUT PARAMETERS
       count     Number of elements in buffer (integer).

       datatype  Data type of each buffer element (handle).


OUTPUT PARAMETERS
       buf       Initial address of buffer (choice).

       IERROR    Fortran only: Error status (integer).


DESCRIPTION
       MPI_File_read_all_begin is the beginning part of a split collective operation that attempts  to  read
       from  the  file associated with fh (at the current individual file pointer position maintained by the
       system) a total number of count data items having datatype type into the user's buffer buf.  The data
       is taken out of those parts of the file specified by the current view.


NOTES
       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 Section 9.4.5 of the MPI-2 standard.


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.




Open MPI 1.2                                   September 2006              MPI_File_read_all_begin(3OpenMPI)