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MPI_File_read_ordered - Reads a file at a location specified by a
shared file pointer (blocking, collective).
C Syntax
#include <mpi.h>
int MPI_File_read_ordered(MPI_File fh, void *buf,
int count, MPI_Datatype datatype,
MPI_Status *status)
INCLUDE ’mpif.h’
MPI_FILE_READ_ORDERED(FH, BUF, COUNT, DATATYPE,
STATUS, IERROR)
<type> BUF(*)
INTEGER FH, COUNT, DATATYPE, STATUS(MPI_STATUS_SIZE), IERROR
#include <mpi.h>
void MPI::File::Read_ordered(void* buf, int count,
const MPI::Datatype& datatype, MPI::Status& status)
void MPI::File::Read_ordered(void* buf, int count,
const MPI::Datatype& datatype)
- 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_ordered
is a collective routine. This routine must be called by all processes in
the communicator group associated with the file handle fh. Each process
may pass different argument values for the datatype and count arguments.
Each process attempts to read, from the file associated with fh, a total
number of count data items having datatype type into the user’s buffer
buf. For each process, the location in the file at which data is read is
the position at which the shared file pointer would be after all processes
whose ranks within the group are less than that of this process had read
their data. MPI_File_read_ordered returns the actual number of datatype
elements read in status. The shared file pointer is updated by the amounts
of data requested by all processes of the group.
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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