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<TITLE>MPI_Comm_set_attr</TITLE>
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MPI_Comm_set_attr
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Stores attribute value associated with a key
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Synopsis
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int MPI_Comm_set_attr(MPI_Comm comm, int comm_keyval, void *attribute_val)
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Input Parameters
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comm communicator to which attribute will be attached (handle)
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comm_keyval key value, as returned by <tt>MPI_Comm_create_keyval</tt> (integer)
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attribute_val attribute value
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Notes
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Values of the permanent attributes <tt>MPI_TAG_UB</tt>, <tt>MPI_HOST</tt>, <tt>MPI_IO</tt>,
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<tt>MPI_WTIME_IS_GLOBAL</tt>, <tt>MPI_UNIVERSE_SIZE</tt>, <tt>MPI_LASTUSEDCODE</tt>, and
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<tt>MPI_APPNUM</tt> may not be changed.
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The type of the attribute value depends on whether C, C++, or Fortran
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is being used.
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In C and C++, an attribute value is a pointer (<tt>void *</tt>); in Fortran, it is an
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address-sized integer.
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If an attribute is already present, the delete function (specified when the
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corresponding keyval was created) will be called.
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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_COMM Invalid communicator. A common error is to use a null
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communicator in a call (not even allowed in <tt>MPI_Comm_rank</tt>).
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MPI_ERR_KEYVAL Invalid keyval
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MPI_ERR_ARG This error class is associated with an error code that
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indicates that an attempt was made to free one of the permanent keys.
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See Also
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MPI_Comm_create_keyval, MPI_Comm_delete_attr
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