int MPIR_Barrier(MPID_Comm *comm_ptr, MPIR_Errflag_t *errflag)
{
int mpi_errno = MPI_SUCCESS;
if (comm_ptr->comm_kind == MPID_INTRACOMM) {
/* intracommunicator */
mpi_errno = MPIR_Barrier_intra( comm_ptr, errflag );
if (mpi_errno) MPIR_ERR_POP(mpi_errno);
} else {
/* intercommunicator */
mpi_errno = MPIR_Barrier_inter( comm_ptr, errflag );
if (mpi_errno) MPIR_ERR_POP(mpi_errno);
}
fn_exit:
return mpi_errno;
fn_fail:
goto fn_exit;
}
PMPI_LOCAL int MPIR_Barrier_or_coll_fn(MPID_Comm *comm_ptr, int *errflag )
{
int mpi_errno = MPI_SUCCESS;
if (comm_ptr->coll_fns != NULL && comm_ptr->coll_fns->Barrier != NULL)
{
/* --BEGIN USEREXTENSION-- */
mpi_errno = comm_ptr->node_roots_comm->coll_fns->Barrier(comm_ptr, errflag);
if (mpi_errno) MPIU_ERR_POP(mpi_errno);
/* --END USEREXTENSION-- */
}
else {
mpi_errno = MPIR_Barrier_intra(comm_ptr, errflag);
if (mpi_errno) MPIU_ERR_POP(mpi_errno);
}
fn_exit:
return mpi_errno;
fn_fail:
goto fn_exit;
}
int MPIR_Barrier_inter( MPID_Comm *comm_ptr, MPIR_Errflag_t *errflag )
{
int rank, mpi_errno = MPI_SUCCESS, root;
int mpi_errno_ret = MPI_SUCCESS;
int i = 0;
MPID_Comm *newcomm_ptr = NULL;
rank = comm_ptr->rank;
/* Get the local intracommunicator */
if (!comm_ptr->local_comm) {
mpi_errno = MPIR_Setup_intercomm_localcomm( comm_ptr );
if (mpi_errno) MPIR_ERR_POP(mpi_errno);
}
newcomm_ptr = comm_ptr->local_comm;
/* do a barrier on the local intracommunicator */
mpi_errno = MPIR_Barrier_intra(newcomm_ptr, errflag);
if (mpi_errno) {
/* for communication errors, just record the error but continue */
*errflag = MPIR_ERR_GET_CLASS(mpi_errno);
MPIR_ERR_SET(mpi_errno, *errflag, "**fail");
MPIR_ERR_ADD(mpi_errno_ret, mpi_errno);
}
/* rank 0 on each group does an intercommunicator broadcast to the
remote group to indicate that all processes in the local group
have reached the barrier. We do a 1-byte bcast because a 0-byte
bcast will just return without doing anything. */
/* first broadcast from left to right group, then from right to
left group */
if (comm_ptr->is_low_group) {
/* bcast to right*/
root = (rank == 0) ? MPI_ROOT : MPI_PROC_NULL;
mpi_errno = MPIR_Bcast_inter(&i, 1, MPI_BYTE, root, comm_ptr, errflag);
if (mpi_errno) {
/* for communication errors, just record the error but continue */
*errflag = MPIR_ERR_GET_CLASS(mpi_errno);
MPIR_ERR_SET(mpi_errno, *errflag, "**fail");
MPIR_ERR_ADD(mpi_errno_ret, mpi_errno);
}
/* receive bcast from right */
root = 0;
mpi_errno = MPIR_Bcast_inter(&i, 1, MPI_BYTE, root, comm_ptr, errflag);
if (mpi_errno) {
/* for communication errors, just record the error but continue */
*errflag = MPIR_ERR_GET_CLASS(mpi_errno);
MPIR_ERR_SET(mpi_errno, *errflag, "**fail");
MPIR_ERR_ADD(mpi_errno_ret, mpi_errno);
}
}
else {
/* receive bcast from left */
root = 0;
mpi_errno = MPIR_Bcast_inter(&i, 1, MPI_BYTE, root, comm_ptr, errflag);
if (mpi_errno) {
/* for communication errors, just record the error but continue */
*errflag = MPIR_ERR_GET_CLASS(mpi_errno);
MPIR_ERR_SET(mpi_errno, *errflag, "**fail");
MPIR_ERR_ADD(mpi_errno_ret, mpi_errno);
}
/* bcast to left */
root = (rank == 0) ? MPI_ROOT : MPI_PROC_NULL;
mpi_errno = MPIR_Bcast_inter(&i, 1, MPI_BYTE, root, comm_ptr, errflag);
if (mpi_errno) {
/* for communication errors, just record the error but continue */
*errflag = MPIR_ERR_GET_CLASS(mpi_errno);
MPIR_ERR_SET(mpi_errno, *errflag, "**fail");
MPIR_ERR_ADD(mpi_errno_ret, mpi_errno);
}
}
fn_exit:
if (mpi_errno_ret)
mpi_errno = mpi_errno_ret;
else if (*errflag != MPIR_ERR_NONE)
MPIR_ERR_SET(mpi_errno, *errflag, "**coll_fail");
return mpi_errno;
fn_fail:
goto fn_exit;
}
int MPIR_Barrier_impl(MPID_Comm *comm_ptr, int *errflag)
{
int mpi_errno = MPI_SUCCESS;
int mpi_errno_ret = MPI_SUCCESS;
if (comm_ptr->coll_fns != NULL && comm_ptr->coll_fns->Barrier != NULL)
{
mpi_errno = comm_ptr->coll_fns->Barrier(comm_ptr, errflag);
if (mpi_errno) MPIU_ERR_POP(mpi_errno);
}
else
{
if (comm_ptr->comm_kind == MPID_INTRACOMM) {
#if defined(USE_SMP_COLLECTIVES)
if (MPIR_Comm_is_node_aware(comm_ptr)) {
/* do the intranode barrier on all nodes */
if (comm_ptr->node_comm != NULL)
{
mpi_errno = MPIR_Barrier_or_coll_fn(comm_ptr->node_comm, errflag);
if (mpi_errno) {
/* for communication errors, just record the error but continue */
*errflag = TRUE;
MPIU_ERR_SET(mpi_errno, MPI_ERR_OTHER, "**fail");
MPIU_ERR_ADD(mpi_errno_ret, mpi_errno);
}
}
/* do the barrier across roots of all nodes */
if (comm_ptr->node_roots_comm != NULL) {
mpi_errno = MPIR_Barrier_or_coll_fn(comm_ptr->node_roots_comm, errflag);
if (mpi_errno) {
/* for communication errors, just record the error but continue */
*errflag = TRUE;
MPIU_ERR_SET(mpi_errno, MPI_ERR_OTHER, "**fail");
MPIU_ERR_ADD(mpi_errno_ret, mpi_errno);
}
}
/* release the local processes on each node with a 1-byte broadcast
(0-byte broadcast just returns without doing anything) */
if (comm_ptr->node_comm != NULL)
{
int i=0;
mpi_errno = MPIR_Bcast_impl(&i, 1, MPI_BYTE, 0, comm_ptr->node_comm, errflag);
if (mpi_errno) {
/* for communication errors, just record the error but continue */
*errflag = TRUE;
MPIU_ERR_SET(mpi_errno, MPI_ERR_OTHER, "**fail");
MPIU_ERR_ADD(mpi_errno_ret, mpi_errno);
}
}
}
else {
mpi_errno = MPIR_Barrier_intra( comm_ptr, errflag );
if (mpi_errno) MPIU_ERR_POP(mpi_errno);
}
#else
mpi_errno = MPIR_Barrier_intra( comm_ptr, errflag );
if (mpi_errno) MPIU_ERR_POP(mpi_errno);
#endif
}
else {
/* intercommunicator */
mpi_errno = MPIR_Barrier_inter( comm_ptr, errflag );
if (mpi_errno) MPIU_ERR_POP(mpi_errno);
}
}
fn_exit:
if (mpi_errno_ret)
mpi_errno = mpi_errno_ret;
else if (*errflag)
MPIU_ERR_SET(mpi_errno, MPI_ERR_OTHER, "**coll_fail");
return mpi_errno;
fn_fail:
goto fn_exit;
}