MPI_Open_port

Establish an address that can be used to establish connections between groups of MPI processes

Synopsis



int MPI_Open_port(MPI_Info info, char *port_name)






Input Parameters




info  
 implementation-specific information on how to establish an address (handle)





Output Parameters




port_name  
 newly established port (string)





Notes

MPI copies a system-supplied port name into port_name. port_name identifies
the newly opened port and can be used by a client to contact the server.
The maximum size string that may be supplied by the system is
MPI_MAX_PORT_NAME.



Reserved Info Key Values




ip_port  
 Value contains IP port number at which to establish a port.


ip_address  
 Value contains IP address at which to establish a port.
If the address is not a valid IP address of the host on which the
MPI_OPEN_PORT call is made, the results are undefined.





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 communicators),
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 predefined 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
identified by a specific error class (e.g., MPI_ERR_RANK).





MPI_ERR_INFO  
 Invalid Info 





MPI_ERR_OTHER  
 Other error; use MPI_Error_string to get more information
about this error code.