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)
- fh
- File handle (handle).
- 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 deterministic 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.