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<TITLE>MPI_Open_port</TITLE>
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MPI_Open_port
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Establish an address that can be used to establish connections between groups of MPI processes
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Synopsis
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int MPI_Open_port(MPI_Info info, char *port_name)
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Input Parameters
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info implementation-specific information on how to establish a
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port for <tt>MPI_Comm_accept</tt> (handle)
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Output Parameters
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port_name newly established port (string)
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Notes
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MPI copies a system-supplied port name into <tt>port_name</tt>. <tt>port_name</tt> identifies
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the newly opened port and can be used by a client to contact the server.
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The maximum size string that may be supplied by the system is
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<tt>MPI_MAX_PORT_NAME</tt>.
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Reserved Info Key Values
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ip_port Value contains IP port number at which to establish a port.
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ip_address Value contains IP address at which to establish a port.
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If the address is not a valid IP address of the host on which the
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<tt>MPI_OPEN_PORT</tt> call is made, the results are undefined.
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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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