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MPIL_Signal(3)				     LAM/MPI				   MPIL_Signal(3)

       MPIL_Signal -  LAM/MPI-specific function to send a LAM signal to a rank in an MPI communi-

       #include <mpi.h>
       int MPIL_Signal(MPI_Comm comm, int rank, int signo)

       dtype  - MPI datatype (handle)

       ptid   - datatype ID (integer)

       An asynchronous signal is delivered from one process to another with  MPIL_Signal().   The
       target  process	is selected with a communicator and a process rank within that communica-
       tor.  The remaining argument, signo, identifies the signal to be delivered.  These signals
       are  completely	apart  from the signals provided by the underlying operating system.  LAM
       signals, defined in <lam_ksignal.h>, are listed below.

       LAM_SIGTRACE   1    unload trace data
       LAM_SIGUDIE    4    terminate
       LAM_SIGARREST  5    suspend execution
       LAM_SIGRELEASE 6    continue execution
       LAM_SIGA       7    user defined
       LAM_SIGB       8    user defined
       LAM_SIGFUSE    9    node about to die
       LAM_SIGSHRINK  10   another node has died

       This is a LAM/MPI-specific function.  Most users should not have use  for  this	function.
       If this function is used, it should be used in conjunction with the LAM_MPI C preprocessor

       #if LAM_MPI
       MPIL_Signal(MPI_COMM_WORLD, 0, SIGINT);

       All MPI routines in Fortran (except for MPI_WTIME and MPI_WTICK ) have an additional argu-
       ment 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.

       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 values to be returned (in C and Fortran; this error handler is less useful  in
       with  the  C++  MPI  bindings.	The predefined 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++ bindings for
       MPI  do not return error values; instead, error values are communicated by throwing excep-
       tions 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.
	      - No error; MPI routine completed successfully.
	      - Invalid communicator.  A common error is to use a null	communicator  in  a  call
	      (not even allowed in MPI_Comm_rank ).
	      -  Invalid  source or destination rank.  Ranks must be between zero and the size of
	      the  communicator  minus	one;  ranks  in  a  receive  (	MPI_Recv  ,  MPI_Irecv	,
	      MPI_Sendrecv , etc.) may also be MPI_ANY_SOURCE
	      - Other error; use MPI_Error_string to get more information about this error code.



LAM/MPI 6.5.8				    11/10/2002				   MPIL_Signal(3)
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