NAME¶

MPI_File_read_shared - Reads a file using the shared file pointer (blocking, noncollective).

SYNTAX¶

C Syntax¶

#include <mpi.h>
int MPI_File_read_shared(MPI_File fh, void *buf, int count,
	MPI_Datatype datatype, MPI_Status *status)

Fortran Syntax¶

USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_FILE_READ_SHARED(FH, BUF, COUNT, DATATYPE, STATUS,
	IERROR)
	<type>	BUF(*)
	INTEGER	FH, COUNT, DATATYPE,STATUS(MPI_STATUS_SIZE), IERROR

Fortran 2008 Syntax¶

USE mpi_f08
MPI_File_read_shared(fh, buf, count, datatype, status, ierror)
	TYPE(MPI_File), INTENT(IN) :: fh
	TYPE(*), DIMENSION(..) :: buf
	INTEGER, INTENT(IN) :: count
	TYPE(MPI_Datatype), INTENT(IN) :: datatype
	TYPE(MPI_Status) :: status
	INTEGER, OPTIONAL, INTENT(OUT) :: ierror

C++ Syntax¶

#include <mpi.h>
void MPI::File::Read_shared(void* buf, int count,
	const MPI::Datatype& datatype, MPI::Status& status)
void MPI::File::Read_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).

status

Status object (status).

IERROR

Fortran only: Error status (integer).

DESCRIPTION¶

MPI_File_read_shared is a blocking routine that uses the shared file pointer to read files. The order of serialization is not deterministic for this noncollective routine.

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.