MPI_Unpack_external_c(3) MPI MPI_Unpack_external_c(3)
NAME
MPI_Unpack_external_c - Unpack a buffer (packed with MPI_Pack_exter-
nal) according to a datatype into contiguous memory
SYNOPSIS
int MPI_Unpack_external_c(const char datarep[], const void *inbuf, MPI_Count insize,
MPI_Count *position, void *outbuf, MPI_Count outcount,
MPI_Datatype datatype)
INPUT PARAMETERS
datarep
- data representation (string) (string)
inbuf - input buffer start (choice) (choice)
insize - input buffer size, in bytes (integer) (integer)
outcount
- number of output data items (integer) (integer)
datatype
- datatype of output data item (handle) (handle)
INPUT/OUTPUT PARAMETERS
position
- current position in buffer, in bytes (integer) (integer)
OUTPUT PARAMETERS
outbuf - output buffer start (choice) (choice)
THREAD AND INTERRUPT SAFETY
This routine is thread-safe. This means that this routine may be
safely used by multiple threads without the need for any user-provided
thread locks. However, the routine is not interrupt safe. Typically,
this is due to the use of memory allocation routines such as malloc or
other non-MPICH runtime routines that are themselves not interrupt-
safe.
NOTES FOR FORTRAN
All MPI routines in Fortran (except for MPI_WTIME and MPI_WTICK ) have
an additional argument ierr at the end of the argument list. ierr is
an integer and has the same meaning as the return value of the routine
in C. In Fortran, MPI routines are subroutines, and are invoked with
the call statement.
All MPI objects (e.g., MPI_Datatype , MPI_Comm ) are of type INTEGER in
Fortran.
ERRORS
All MPI routines (except MPI_Wtime and MPI_Wtick ) return an error
value; C routines as the value of the function and Fortran routines in
the last argument. Before the value is returned, the current MPI error
handler is called. By default, this error handler aborts the MPI job.
The error handler may be changed with MPI_Comm_set_errhandler (for com-
municators), MPI_File_set_errhandler (for files), and
MPI_Win_set_errhandler (for RMA windows). The MPI-1 routine
MPI_Errhandler_set may be used but its use is deprecated. The prede-
fined error handler MPI_ERRORS_RETURN may be used to cause error values
to be returned. Note that MPI does not guarantee that an MPI program
can continue past an error; however, MPI implementations will attempt
to continue whenever possible.
MPI_SUCCESS
- No error; MPI routine completed successfully.
MPI_ERR_ARG
- Invalid argument. Some argument is invalid and is not identi-
fied by a specific error class (e.g., MPI_ERR_RANK ).
MPI_ERR_COUNT
- Invalid count argument. Count arguments must be non-negative;
a count of zero is often valid.
MPI_ERR_TYPE
- Invalid datatype argument. Additionally, this error can occur
if an uncommitted MPI_Datatype (see MPI_Type_commit ) is used in
a communication call.
MPI_ERR_OTHER
- Other error; use MPI_Error_string to get more information
about this error code.
2/22/2022 MPI_Unpack_external_c(3)
mpi 4.0.1 - Generated Wed Apr 6 05:50:16 CDT 2022