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<TITLE>MPI_Pack</TITLE>
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MPI_Pack
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Packs a datatype into contiguous memory
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Synopsis
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int MPI_Pack(const void *inbuf,
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int incount,
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MPI_Datatype datatype, void *outbuf, int outsize, int *position, MPI_Comm comm)
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Input Parameters
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inbuf input buffer start (choice)
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incount number of input data items (non-negative integer)
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datatype datatype of each input data item (handle)
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outsize output buffer size, in bytes (non-negative integer)
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comm communicator for packed message (handle)
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Output Parameters
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outbuf output buffer start (choice)
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Input/Output Parameters
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position current position in buffer, in bytes (integer)
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Notes (from the specifications)
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The input value of position is the first location in the output buffer to be
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used for packing. position is incremented by the size of the packed message,
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and the output value of position is the first location in the output buffer
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following the locations occupied by the packed message. The comm argument is
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the communicator that will be subsequently used for sending the packed
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message.
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Notes for Fortran
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All MPI routines in Fortran (except for <tt>MPI_WTIME</tt> and <tt>MPI_WTICK</tt>) have
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an additional argument <tt>ierr</tt> at the end of the argument list. <tt>ierr
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</tt>is an integer and has the same meaning as the return value of the routine
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in C. In Fortran, MPI routines are subroutines, and are invoked with the
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<tt>call</tt> statement.
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All MPI objects (e.g., <tt>MPI_Datatype</tt>, <tt>MPI_Comm</tt>) are of type <tt>INTEGER
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</tt>in Fortran.
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Errors
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All MPI routines (except <tt>MPI_Wtime</tt> and <tt>MPI_Wtick</tt>) return an error value;
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C routines as the value of the function and Fortran routines in the last
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argument. Before the value is returned, the current MPI error handler is
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called. By default, this error handler aborts the MPI job. The error handler
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may be changed with <tt>MPI_Comm_set_errhandler</tt> (for communicators),
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<tt>MPI_File_set_errhandler</tt> (for files), and <tt>MPI_Win_set_errhandler</tt> (for
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RMA windows). The MPI-1 routine <tt>MPI_Errhandler_set</tt> may be used but
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its use is deprecated. The predefined error handler
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<tt>MPI_ERRORS_RETURN</tt> may be used to cause error values to be returned.
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Note that MPI does not guarentee that an MPI program can continue past
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an error; however, MPI implementations will attempt to continue whenever
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possible.
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MPI_SUCCESS No error; MPI routine completed successfully.
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MPI_ERR_ARG Invalid argument. Some argument is invalid and is not
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identified by a specific error class (e.g., <tt>MPI_ERR_RANK</tt>).
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MPI_ERR_OTHER Other error; use <tt>MPI_Error_string</tt> to get more information
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about this error code.
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