MPI_Comm_delete_attr − Deletes attribute value associated with a key.
#include
<mpi.h>
int MPI_Comm_delete_attr(MPI_Comm comm, int
comm_keyval)
USE MPI
! or the older form: INCLUDE ’mpif.h’
MPI_COMM_DELETE_ATTR(COMM, COMM_KEYVAL, IERROR)
INTEGER |
COMM, COMM_KEYVAL, IERROR |
USE mpi_f08
MPI_Comm_delete_attr(comm, comm_keyval,
ierror)
TYPE(MPI_Comm), INTENT(IN) :: comm | |
INTEGER, INTENT(IN) :: comm_keyval | |
INTEGER, OPTIONAL, INTENT(OUT) :: ierror |
comm |
Communicator from which the attribute is deleted (handle). |
comm_keyval
Key value (integer).
IERROR |
Fortran only: Error status (integer). |
MPI_Comm_delete_attr deletes an attribute from cache by key. This function invokes the attribute delete function delete_fn specified when the comm_keyval was created. The call will fail if the delete_fn function returns an error code other than MPI_SUCCESS.
Whenever a communicator is replicated using the function MPI_Comm_dup, all callback copy functions for attributes that are currently set are invoked (in arbitrary order). Whenever a communicator is deleted using the function MPI_Comm_free, all callback delete functions for attributes that are currently set are invoked.
This function is the same as MPI_Attr_delete but is needed to match the communicator-specific functions introduced in the MPI-2 standard. The use of MPI_Attr_delete is deprecated.
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.