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Name
MPI_Comm_disconnect - Deallocates communicator object and sets
handle to MPI_COMM_NULL.
Syntax
C Syntax
#include <mpi.h>
int MPI_Comm_disconnect(MPI_Comm *comm)
Fortran Syntax
USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_COMM_DISCONNECT(COMM, IERROR)
INTEGER COMM, IERROR
Fortran 2008 Syntax
USE mpi_f08
MPI_Comm_disconnect(comm, ierror)
TYPE(MPI_Comm), INTENT(INOUT) :: comm
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
Input/Output Parameter
comm: Communicator (handle).
Output Parameter
IERROR: Fortran only: Error status (integer).
Description
MPI_Comm_disconnect waits for all pending communication on comm to
complete internally, deallocates the communicator object, and sets the
handle to MPI_COMM_NULL. It is a collective operation.
It may not be called with the communicator MPI_COMM_WORLD or
MPI_COMM_SELF.
MPI_Comm_disconnect may be called only if all communication is complete
and matched, so that buffered data can be delivered to its destination.
This requirement is the same as for MPI_Finalize.
MPI_Comm_disconnect has the same action as MPI_Comm_free, except that it
waits for pending communication to finish internally and enables the
guarantee about the behavior of disconnected processes.
Notes
To disconnect two processes you may need to call MPI_Comm_disconnect,
MPI_Win_free, and MPI_File_close to remove all communication paths
between the two processes. Note that it may be necessary to disconnect
several communicators (or to free several windows or files) before two
processes are completely independent.
Errors
Almost all MPI routines return an error value; C routines as the value
of the function and Fortran routines in the last argument.
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.