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NAME
MPI_Comm_get_parent - Returns the parent intercommunicator of current
spawned process.
SYNTAX
C 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.
NOTES
MPI_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.
SEE ALSO
MPI_Comm_spawn
MPI_Comm_spawn_multiple
1.3.4 Nov 11, 2009 MPI_Comm_get_parent(3)
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