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MPI_File_iread_shared - Reads a file using the shared file pointer
(nonblocking, noncollective).
C Syntax
#include <mpi.h>
int MPI_File_iread_shared(MPI_File fh, void *buf, int count,
MPI_Datatype datatype, MPI_Request *request)
USE MPI
! or the older form: INCLUDE ’mpif.h’
MPI_FILE_IREAD_SHARED(FH, BUF, COUNT, DATATYPE, REQUEST, IERROR)
<type> BUF(*)
INTEGER FH, COUNT, DATATYPE, REQUEST, IERROR
USE mpi_f08
MPI_File_iread_shared(fh, buf, count, datatype, request, ierror)
TYPE(MPI_File), INTENT(IN) :: fh
TYPE(*), DIMENSION(..), ASYNCHRONOUS :: buf
INTEGER, INTENT(IN) :: count
TYPE(MPI_Datatype), INTENT(IN) :: datatype
TYPE(MPI_Request), INTENT(OUT) :: request
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
- fh
- File handle (handle).
- count
- Number
of elements in buffer (integer).
- datatype
- Data type of each buffer element
(handle).
- buf
- Initial address of buffer (choice).
- request
- Request object (handle).
- IERROR
- Fortran only: Error status (integer).
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.
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.
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