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

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.