Asynchronus resource sharing between processes?

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LEARN ABOUT OSX

mpi_comm_join

MPI_Comm_join(3OpenMPI) 												   MPI_Comm_join(3OpenMPI)

NAME

       MPI_Comm_join - Establishes communication between MPI jobs

SYNTAX

C Syntax
       #include <mpi.h>
       int MPI_Comm_join(int fd, MPI_Comm *intercomm)

Fortran Syntax
       INCLUDE 'mpif.h'
       MPI_COMM_JOIN(FD, INTERCOMM, IERROR)
	    INTEGER   FD, INTERCOMM, IERROR

C++ Syntax
       #include <mpi.h>
       MPI::Intercomm MPI::Comm::Join(const int fd)

INPUT PARAMETER

       fd	 socket file descriptor (socket).

OUTPUT PARAMETERS

       intercomm Intercommunicator between processes (handle).

       IERROR	 Fortran only: Error status (integer).

DESCRIPTION

       MPI_Comm_join creates an intercommunicator from the union of two MPI processes that are connected by a socket. fd is a file descriptor rep-
       resenting a socket of type SOCK_STREAM (a two-way reliable byte-stream connection). Nonblocking I/O and asynchronous notification via SIGIO
       must not be enabled for the socket. The socket must be in a connected state, and must be quiescent when MPI_Comm_join is called.

       MPI_Comm_join must be called by the process at each end of the socket. It does not return until both processes have called MPI_Comm_join.

NOTES

       There  are  no  MPI library calls for opening and manipulating a socket.  The socket fd can be opened using standard socket API calls.  MPI
       uses the socket to bootstrap creation of the intercommunicator, and for nothing else. Upon return, the file descriptor  will  be  open  and
       quiescent.

       In  a  multithreaded  process, the application must ensure that other threads do not access the socket while one is in the midst of calling
       MPI_Comm_join.

       The returned communicator will contain the two processes connected by the socket, and may be used to establish MPI communication with addi-
       tional processes, through the usual MPI communicator-creation mechanisms.

ERRORS

       Almost all MPI routines return an error value; C routines as the value of the function and Fortran routines in the last argument. C++ func-
       tions do not return errors. If the default error handler is set to MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception  mechanism
       will be used to throw an MPI:Exception object.

       Before  the error value is returned, the current MPI error handler is called. By default, this error handler aborts the MPI job, except for
       I/O function errors. The error handler may be changed with MPI_Comm_set_errhandler; 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.

       See the MPI man page for a full list of MPI error codes.

SEE ALSO

       socket(3SOCKET)
       MPI_Comm_create
       MPI_Comm_group

Open MPI 1.2							  September 2006					   MPI_Comm_join(3OpenMPI)

UNIX for Advanced & Expert Users