Move collective algorithms to separate folders

[simgrid.git] / src / smpi / colls / bcast / bcast-flattree.cpp

diff --git a/src/smpi/colls/bcast/bcast-flattree.cpp b/src/smpi/colls/bcast/bcast-flattree.cpp
new file mode 100644 (file)
index 0000000..2a307f5
--- /dev/null
+++ b/src/smpi/colls/bcast/bcast-flattree.cpp
@@ -0,0 +1,43 @@
+/* Copyright (c) 2013-2014. The SimGrid Team.
+ * All rights reserved.                                                     */
+
+/* This program is free software; you can redistribute it and/or modify it
+ * under the terms of the license (GNU LGPL) which comes with this package. */
+
+#include "../colls_private.h"
+
+int
+smpi_coll_tuned_bcast_flattree(void *buff, int count, MPI_Datatype data_type,
+                               int root, MPI_Comm comm)
+{
+  MPI_Request *req_ptr;
+  MPI_Request *reqs;
+
+  int i, rank, num_procs;
+  int tag = COLL_TAG_BCAST;
+
+  rank = comm->rank();
+  num_procs = comm->size();
+
+  if (rank != root) {
+    Request::recv(buff, count, data_type, root, tag, comm, MPI_STATUS_IGNORE);
+  }
+
+  else {
+    reqs = (MPI_Request *) xbt_malloc((num_procs - 1) * sizeof(MPI_Request));
+    req_ptr = reqs;
+
+    // Root sends data to all others
+    for (i = 0; i < num_procs; i++) {
+      if (i == rank)
+        continue;
+      *(req_ptr++) = Request::isend(buff, count, data_type, i, tag, comm);
+    }
+
+    // wait on all requests
+    Request::waitall(num_procs - 1, reqs, MPI_STATUSES_IGNORE);
+
+    free(reqs);
+  }
+  return MPI_SUCCESS;
+}