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MPI_File_read_all - Reads a file starting at the locations specified
by individual file pointers (blocking, collective).
C Syntax
#include <mpi.h>
int MPI_File_read_all(MPI_File fh, void *buf,
int count, MPI_Datatype datatype, MPI_Status *status)
INCLUDE ’mpif.h’
MPI_FILE_READ_ALL( FH, BUF, COUNT,
DATATYPE, STATUS, IERROR)
<type> BUF(*)
INTEGER FH, COUNT, DATATYPE, STATUS(MPI_STATUS_SIZE),
IERROR
#include <mpi.h>
void MPI::File::Read_all(void* buf, int count,
const MPI::Datatype& datatype, MPI::Status& status)
void MPI::File::Read_all(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_all is
a collective routine that attempts to read from the file associated with
fh (at the current individual file pointer position maintained by the
system) a total number of count data items having datatype type into
the user’s buffer buf. The data is taken out of those parts of the file
specified by the current view. MPI_File_read_all stores the number of data-type
elements actually read in status. All other fields of status are undefined.
It is erroneous to call this function if MPI_MODE_SEQUENTIAL mode was
specified when the file was opened.
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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