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 PARAMETER
dtype - MPI datatype (handle)
OUTPUT PARAMETER
ptid - datatype ID (integer)
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, identi
fies the signal to be delivered. These signals are com
pletely apart from the signals provided by the underlying
operating system. LAM signals, defined in <lam_ksig
nal.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 pre
processor macro
#if LAM_MPI
MPIL_Signal(MPI_COMM_WORLD, 0, SIGINT);
#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 For
tran, MPI routines are subroutines, and are invoked with
the call statement.
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
is less useful in with the C++ MPI bindings. The prede
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_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
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