17.2.137. MPI_File_read_shared

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

17.2.137.1. SYNTAX

17.2.137.1.1. C Syntax

#include <mpi.h>

int MPI_File_read_shared(MPI_File fh, void *buf, int count,
     MPI_Datatype datatype, MPI_Status *status)

17.2.137.1.2. 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

17.2.137.1.3. 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

17.2.137.2. INPUT/OUTPUT PARAMETER

  • fh: File handle (handle).

17.2.137.3. INPUT PARAMETERS

  • count: Number of elements in buffer (integer)

  • datatype: Data type of each buffer element (handle).

17.2.137.4. OUTPUT PARAMETERS

  • buf: Initial address of buffer (choice).

  • status: Status object (status).

  • IERROR: Fortran only: Error status (integer).

17.2.137.5. 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.

17.2.137.6. ERRORS

Almost all MPI routines return an error value; C routines as the value of the function and Fortran routines in the last argument.

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.