MPI_Lookup_name -  Lookup a previously published name


SYNOPSIS

       #include <mpi.h>
       int
       MPI_Unpublish_name(char *service_name, MPI_Info info, char *port_name)


INPUT PARAMETERS

       service_name
              - a service name
       info   - implementation-specific information
       port_name
              - a port name from MPI_Open_port


NOTES

       Currently,  LAM/MPI  ignores any info keys that are passed
       to this function.  As such, info keys specific to  a  dif­
       ferent  implementation  can safely be passed to this func­
       tion.  Additionally, the MPI  constant  MPI_INFO_NULL  can
       also be used.

       The scope of the published name is the LAM universe -- MPI
       processes running on any node included  from  the  initial
       lamboot  are  capable  of  retrieving  a name published by
       MPI_Publish_name .  Service names stay in existence  until
       they  are  either manually removed with MPI_Unpublish_name
       or cleaned with the lamclean command.  It is a common mis­
       take  to forget to MPI_Unpublish_name at the end of a run,
       and therefore leave published names  in  the  LAM  runtime
       environment.


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  For­
       tran,  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

       If  an  error  occurs  in an MPI function, the current MPI
       error handler is called to handle it.   By  default,  this
       error  handler  aborts the MPI job.  The error handler may
       be changed with MPI_Errhandler_set ; the predefined  error
       handler  MPI_ERRORS_RETURN may be used to cause error val­
       ues to be returned (in C and Fortran; this  error  handler

       fined error handler MPI::ERRORS_THROW_EXCEPTIONS should be
       used  in  C++  if  the error value needs to be recovered).
       Note that MPI does not guarantee that an MPI  program  can
       continue past an error.

       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.  The C++ bind­
       ings for MPI do not return error  values;  instead,  error
       values  are  communicated  by  throwing exceptions of type
       MPI::Exception (but not by default).  Exceptions are  only
       thrown if the error value is not MPI::SUCCESS .

       Note that if the MPI::ERRORS_RETURN handler is set in C++,
       while MPI functions will return upon an error, there  will
       be no way to recover what the actual error value was.
       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.   This
              is typically a NULL pointer or other such error.
       MPI_ERR_SERVICE
              - This error class is associated with an error code
              that indicates that there was a  problem  with  the
              service  name that was used.  Depending on the con­
              text, this can indicate that the service  name  was
              already  published or that the service name was not
              yet published.


SEE ALSO

       MPI_Lookup_name, MPI_Publish_name


MORE INFORMATION

       For more information, please see the  official  MPI  Forum
       web  site,  which  contains the text of both the MPI-1 and
       MPI-2 standards.  These documents contain detailed  infor­
       mation  about  each  MPI  function  (most  of which is not
       duplicated in these man pages).

       http://www.mpi-forum.org/


LOCATION

       nameunpub.c


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