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MPI_Comm_free - Mark a communicator object for deallocation.
#include <mpi.h>
int MPI_Comm_free(MPI_Comm *comm)
USE MPI
! or the older form: INCLUDE ’mpif.h’
MPI_COMM_FREE(COMM, IERROR)
INTEGER COMM, IERROR
USE mpi_f08
MPI_Comm_free(comm, ierror)
TYPE(MPI_Comm), INTENT(INOUT) :: comm
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
- comm
- Communicator to be destroyed (handle).
- IERROR
- Fortran only: Error status (integer).
This operation marks the
communicator object for deallocation. The handle is set to MPI_COMM_NULL.
Any pending operations that use this communicator will complete normally;
the object is actually deallocated only if there are no other active references
to it. This call applies to intracommunicators and intercommunicators. Upon
actual deallocation, the delete callback functions for all cached attributes
(see Section 5.7 in the MPI-1 Standard, "Caching") are called in arbitrary
order.
Note that it is not defined by the MPI standard what happens
if the delete_fn callback invokes other MPI functions. In Open MPI, it
is not valid for delete_fn callbacks (or any of their children) to add
or delete attributes on the same object on which the delete_fn callback
is being invoked.
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_delete_attr
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