NAME

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

SYNOPSIS

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

INPUT PARAMETERS

       comm   - MPI communicator (handle)
       rank   - rank to send it to
       signo  - signal number

NOTES

       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
       communicator.  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_SIGC       2    user defined
       LAM_SIGARECV   3    async receive pending
       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
       macro

       #if LAM_MPI
       MPIL_Signal(MPI_COMM_WORLD, 0, LAM_SIGUDIE);
       #endif

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

       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
       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_COMM
              - Invalid communicator.  A common error is to use a null  communicator  in  a  call
              (not even allowed in MPI_Comm_rank ).
       MPI_ERR_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 .

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

SEE ALSO

       lam_ksignal

LOCATION

       mpil_signal.c