MPIL_Signal - LAM/MPI-specific function to send a LAM signal to a rank
in an MPI communicator
int MPIL_Signal(MPI_Comm comm, int rank, int signo)
comm - MPI communicator (handle)
rank - rank to send it to
signo - signal number
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
MPIL_Signal(MPI_COMM_WORLD, 0, LAM_SIGUDIE);
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
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.
- 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.