255. Data Access with Explicit Offsets


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If MPI_MODE_SEQUENTIAL mode was specified when the file was opened, it is erroneous to call the routines in this section.

MPI_FILE_READ_AT(fh, offset, buf, count, datatype, status)
IN fhfile handle (handle)
IN offsetfile offset (integer)
OUT bufinitial address of buffer (choice)
IN countnumber of elements in buffer (integer)
IN datatypedatatype of each buffer element (handle)
OUT statusstatus object (Status)

int MPI_File_read_at(MPI_File fh, MPI_Offset offset, void *buf, int count, MPI_Datatype datatype, MPI_Status *status)
MPI_FILE_READ_AT(FH, OFFSET, BUF, COUNT, DATATYPE, STATUS, IERROR)
<type> BUF(*)
INTEGER FH, COUNT, DATATYPE, STATUS(MPI_STATUS_SIZE), IERROR
INTEGER(KIND=MPI_OFFSET_KIND) OFFSET
void MPI::File::Read_at(MPI::Offset offset, void* buf, int count, const MPI::Datatype& datatype, MPI::Status& status)
void MPI::File::Read_at(MPI::Offset offset, void* buf, int count, const MPI::Datatype& datatype)

MPI_FILE_READ_AT reads a file beginning at the position specified by offset.

MPI_FILE_READ_AT_ALL(fh, offset, buf, count, datatype, status)
IN fhfile handle (handle)
IN offsetfile offset (integer)
OUT bufinitial address of buffer (choice)
IN countnumber of elements in buffer (integer)
IN datatypedatatype of each buffer element (handle)
OUT statusstatus object (Status)

int MPI_File_read_at_all(MPI_File fh, MPI_Offset offset, void *buf, int count, MPI_Datatype datatype, MPI_Status *status)
MPI_FILE_READ_AT_ALL(FH, OFFSET, BUF, COUNT, DATATYPE, STATUS, IERROR)
<type> BUF(*)
INTEGER FH, COUNT, DATATYPE, STATUS(MPI_STATUS_SIZE), IERROR
INTEGER(KIND=MPI_OFFSET_KIND) OFFSET
void MPI::File::Read_at_all(MPI::Offset offset, void* buf, int count, const MPI::Datatype& datatype, MPI::Status& status)
void MPI::File::Read_at_all(MPI::Offset offset, void* buf, int count, const MPI::Datatype& datatype)

MPI_FILE_READ_AT_ALL is a collective version of the blocking MPI_FILE_READ_AT interface.

MPI_FILE_WRITE_AT(fh, offset, buf, count, datatype, status)
INOUT fhfile handle (handle)
IN offsetfile offset (integer)
IN bufinitial address of buffer (choice)
IN countnumber of elements in buffer (integer)
IN datatypedatatype of each buffer element (handle)
OUT statusstatus object (Status)

int MPI_File_write_at(MPI_File fh, MPI_Offset offset, void *buf, int count, MPI_Datatype datatype, MPI_Status *status)
MPI_FILE_WRITE_AT(FH, OFFSET, BUF, COUNT, DATATYPE, STATUS, IERROR)
<type> BUF(*)
INTEGER FH, COUNT, DATATYPE, STATUS(MPI_STATUS_SIZE), IERROR
INTEGER(KIND=MPI_OFFSET_KIND) OFFSET
void MPI::File::Write_at(MPI::Offset offset, const void* buf, int count, const MPI::Datatype& datatype, MPI::Status& status)
void MPI::File::Write_at(MPI::Offset offset, const void* buf, int count, const MPI::Datatype& datatype)

MPI_FILE_WRITE_AT writes a file beginning at the position specified by offset.

MPI_FILE_WRITE_AT_ALL(fh, offset, buf, count, datatype, status)
INOUT fhfile handle (handle)
IN offsetfile offset (integer)
IN bufinitial address of buffer (choice)
IN countnumber of elements in buffer (integer)
IN datatypedatatype of each buffer element (handle)
OUT statusstatus object (Status)

int MPI_File_write_at_all(MPI_File fh, MPI_Offset offset, void *buf, int count, MPI_Datatype datatype, MPI_Status *status)
MPI_FILE_WRITE_AT_ALL(FH, OFFSET, BUF, COUNT, DATATYPE, STATUS, IERROR)
<type> BUF(*)
INTEGER FH, COUNT, DATATYPE, STATUS(MPI_STATUS_SIZE), IERROR
INTEGER(KIND=MPI_OFFSET_KIND) OFFSET
void MPI::File::Write_at_all(MPI::Offset offset, const void* buf, int count, const MPI::Datatype& datatype, MPI::Status& status)
void MPI::File::Write_at_all(MPI::Offset offset, const void* buf, int count, const MPI::Datatype& datatype)

MPI_FILE_WRITE_AT_ALL is a collective version of the blocking MPI_FILE_WRITE_AT interface.

MPI_FILE_IREAD_AT(fh, offset, buf, count, datatype, request)
IN fhfile handle (handle)
IN offsetfile offset (integer)
OUT bufinitial address of buffer (choice)
IN countnumber of elements in buffer (integer)
IN datatypedatatype of each buffer element (handle)
OUT requestrequest object (handle)

int MPI_File_iread_at(MPI_File fh, MPI_Offset offset, void *buf, int count, MPI_Datatype datatype, MPI_Request *request)
MPI_FILE_IREAD_AT(FH, OFFSET, BUF, COUNT, DATATYPE, REQUEST, IERROR)
<type> BUF(*)
INTEGER FH, COUNT, DATATYPE, REQUEST, IERROR
INTEGER(KIND=MPI_OFFSET_KIND) OFFSET
MPI::Request MPI::File::Iread_at(MPI::Offset offset, void* buf, int count, const MPI::Datatype& datatype)

MPI_FILE_IREAD_AT is a nonblocking version of the MPI_FILE_READ_AT interface.

MPI_FILE_IWRITE_AT(fh, offset, buf, count, datatype, request)
INOUT fhfile handle (handle)
IN offsetfile offset (integer)
IN bufinitial address of buffer (choice)
IN countnumber of elements in buffer (integer)
IN datatypedatatype of each buffer element (handle)
OUT requestrequest object (handle)

int MPI_File_iwrite_at(MPI_File fh, MPI_Offset offset, void *buf, int count, MPI_Datatype datatype, MPI_Request *request)
MPI_FILE_IWRITE_AT(FH, OFFSET, BUF, COUNT, DATATYPE, REQUEST, IERROR)
<type> BUF(*)
INTEGER FH, COUNT, DATATYPE, REQUEST, IERROR
INTEGER(KIND=MPI_OFFSET_KIND) OFFSET
MPI::Request MPI::File::Iwrite_at(MPI::Offset offset, const void* buf, int count, const MPI::Datatype& datatype)

MPI_FILE_IWRITE_AT is a nonblocking version of the MPI_FILE_WRITE_AT interface.



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