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MPI_Comm_get_parent(3)		      MPI		MPI_Comm_get_parent(3)

NAME
       MPI_Comm_get_parent -  Return the parent	communicator for this process

SYNOPSIS
       int MPI_Comm_get_parent(MPI_Comm	*parent)

OUTPUT PARAMETERS
       parent -	the parent communicator	(handle)

NOTES
       If a process was	started	with MPI_Comm_spawn or MPI_Comm_spawn_multiple
       ,  MPI_Comm_get_parent returns the parent intercommunicator of the cur-
       rent process. This parent intercommunicator is created  implicitly  in-
       side  of	 MPI_Init  and	is  the	 same  intercommunicator  returned  by
       MPI_Comm_spawn 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 .

THREAD AND INTERRUPT SAFETY
       This routine is thread-safe.  This  means  that	this  routine  may  be
       safely  used by multiple	threads	without	the need for any user-provided
       thread locks.  However, the routine is not interrupt safe.   Typically,
       this  is	due to the use of memory allocation routines such as malloc or
       other non-MPICH runtime routines	that  are  themselves  not  interrupt-
       safe.

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
       Fortran.

ERRORS
       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.  Before the value is returned, the current MPI error
       handler	is called.  By default,	this error handler aborts the MPI job.
       The error handler may be	changed	with MPI_Comm_set_errhandler (for com-
       municators), MPI_File_set_errhandler (for files),  and  MPI_Win_set_er-
       rhandler	 (for  RMA windows).  The MPI-1	routine	MPI_Errhandler_set may
       be used but its	use  is	 deprecated.   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;  however, MPI	implementations	will attempt to	continue when-
       ever possible.

       MPI_SUCCESS
	      -	No error; MPI routine completed	successfully.
       MPI_ERR_ARG
	      -	Invalid	argument.  Some	argument is invalid and	is not identi-
	      fied by a	specific error class (e.g., MPI_ERR_RANK ).
       MPI_ERR_OTHER
	      -	Other error; use  MPI_Error_string  to	get  more  information
	      about this error code.

				   2/3/2025		MPI_Comm_get_parent(3)

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