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MPI_Comm_get_parent - Returns the parent intercommunicator of current
spawned process.
#include <mpi.h>
int MPI_Comm_get_parent(MPI_Comm *parent)
INCLUDE ’mpif.h’
MPI_COMM_GET_PARENT(PARENT, IERROR)
INTEGER PARENT, IERROR
#include <mpi.h>
static MPI::Intercomm MPI::Comm::Get_parent()
- parent
- The parent communicator (handle).
- IERROR
- Fortran
only: Error status (integer).
If a process was started with
MPI_Comm_spawn or MPI_Comm_spawn_multiple, 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.
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 parent communicator is not useful.
Almost all
MPI routines return an error value; C routines as the value of the function
and Fortran routines in the last argument. C++ functions 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.
MPI_Comm_spawn
MPI_Comm_spawn_multiple
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