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MPI_File_read_all_begin - Reads a file starting at the locations
specified by individual file pointers; beginning part of a split collective
routine (nonblocking).
C Syntax
#include <mpi.h>
int MPI_File_read_all_begin(MPI_File fh, void *buf,
int count, MPI_Datatype datatype)
INCLUDE ’mpif.h’
MPI_FILE_READ_ALL_BEGIN(FH, BUF, COUNT, DATATYPE, IERROR)
<TYPE> BUF(*)
INTEGER FH, COUNT, DATATYPE, IERROR
#include <mpi.h>
void MPI::File::Read_all_begin(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).
- IERROR
- Fortran only: Error status (integer).
MPI_File_read_all_begin
is the beginning part of a split collective operation 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.
All
the nonblocking collective routines for data access are "split" into two
routines, each with _begin or _end as a suffix. These split collective routines
are subject to the semantic rules described in Section 9.4.5 of the MPI-2
standard.
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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