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MPI_File_iread_shared(3OpenMPI)                                              MPI_File_iread_shared(3OpenMPI)



NAME
       MPI_File_iread_shared - Reads a file using the shared file pointer (nonblocking, noncollective).


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

       Fortran Syntax
           INCLUDE 'mpif.h'
           MPI_FILE_IREAD_SHARED(FH, BUF, COUNT, DATATYPE, REQUEST, IERROR)
                 <type>         BUF(*)
                 INTEGER        FH, COUNT, DATATYPE, REQUEST, IERROR


C++ Syntax
       #include <mpi.h>
       MPI::Request MPI::File::Iread_shared(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).

       request   Request object (handle).

       IERROR    Fortran only: Error status (integer).


DESCRIPTION
       MPI_File_iread_shared  is  a  nonblocking  version of the MPI_File_read_shared interface. It uses the
       shared file pointer to read files. The order of serialization among the processors is not determinis-tic deterministic
       tic  for  this noncollective routine, so you need to use other methods of synchronization to impose a
       particular order among processors.


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_iread_shared(3OpenMPI)