MPI_Comm_get_parent(3) Open MPI MPI_Comm_get_parent(3)NAMEMPI_Comm_get_parent - Returns the parent intercommunicator of current
spawned process.
SYNTAXC Syntax
#include <mpi.h>
int MPI_Comm_get_parent(MPI_Comm *parent)
Fortran Syntax
INCLUDE 'mpif.h'
MPI_COMM_GET_PARENT(PARENT, IERROR)
INTEGER PARENT, IERROR
C++ Syntax
#include <mpi.h>
static MPI::Intercomm MPI::Comm::Get_parent()OUTPUT PARAMETERS
parent The parent communicator (handle).
IERROR Fortran only: Error status (integer).
DESCRIPTION
If a process was started with MPI_Comm_spawn or MPI_Comm_spawn_multi‐
ple, MPI_Comm_get_parent returns the "parent" intercommunicator of the
current process. This parent intercommunicator is created implicitly
inside of MPI_Init and is the same intercommunicator returned by the
spawn call made in the parents.
If the process was not spawned, MPI_Comm_get_parent returns
MPI_COMM_NULL.
After the parent communicator is freed or disconnected,
MPI_Comm_get_parent returns MPI_COMM_NULL.
NOTESMPI_Comm_get_parent returns a handle to a single intercommunicator.
Calling MPI_Comm_get_parent a second time returns a handle to the same
intercommunicator. Freeing the handle with MPI_Comm_disconnect or
MPI_Comm_free will cause other references to the intercommunicator to
become invalid (dangling). Note that calling MPI_Comm_free on the par‐
ent communicator is not useful.
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 ALSO
MPI_Comm_spawn
MPI_Comm_spawn_multiple
1.7.4 Feb 04, 2014 MPI_Comm_get_parent(3)
