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MPI_File_read_shared - Reads a file using the shared file pointer
(blocking, noncollective).
C Syntax
#include <mpi.h>
int MPI_File_read_shared(MPI_File fh, void *buf, int count,
MPI_Datatype datatype, MPI_Status *status)
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
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
- 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).
- status
- Status object (status).
- IERROR
- Fortran only: Error status (integer).
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.
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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