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<TITLE>MPI_Group_range_incl</TITLE>
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MPI_Group_range_incl
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Creates a new group from ranges of ranks in an existing group
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Synopsis
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int MPI_Group_range_incl(MPI_Group group, int n, int ranges[][3],
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MPI_Group *newgroup)
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Input Parameters
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group group (handle)
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n number of triplets in array <tt>ranges</tt> (integer)
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ranges a one-dimensional array of integer triplets, of the
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form (first rank, last rank, stride) indicating ranks in
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<tt>group</tt> or processes to be included in <tt>newgroup</tt>.
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Output Parameters
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- newgroup
- new group derived from above, in the
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order defined by <tt>ranges</tt> (handle)
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Thread and Interrupt Safety
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This routine is thread-safe. This means that this routine may be
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safely used by multiple threads without the need for any user-provided
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thread locks. However, the routine is not interrupt safe. Typically,
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this is due to the use of memory allocation routines such as <tt>malloc
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</tt>or other non-MPICH runtime routines that are themselves not interrupt-safe.
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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_GROUP
- Null or invalid group passed to function.
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- MPI_ERR_INTERN
- This error is returned when some part of the MPICH
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implementation is unable to acquire memory.
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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_RANK
- Invalid source or destination rank. Ranks must be between
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zero and the size of the communicator minus one; ranks in a receive
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(<tt>MPI_Recv</tt>, <tt>MPI_Irecv</tt>, <tt>MPI_Sendrecv</tt>, etc.) may also be <tt>MPI_ANY_SOURCE</tt>.
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<H0>See Also</H0>
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MPI_Group_free
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