From 84adefa331c4159d432d22840663c38f155cd4c1 Mon Sep 17 00:00:00 2001
From: Erlang/OTP <otp@erlang.org>
Date: Fri, 20 Nov 2009 14:54:40 +0000
Subject: The R13B03 release.

---
 lib/percept/test/ipc_tree.erl | 48 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 lib/percept/test/ipc_tree.erl

(limited to 'lib/percept/test/ipc_tree.erl')

diff --git a/lib/percept/test/ipc_tree.erl b/lib/percept/test/ipc_tree.erl
new file mode 100644
index 0000000000..f7639eed1b
--- /dev/null
+++ b/lib/percept/test/ipc_tree.erl
@@ -0,0 +1,48 @@
+%% ``The contents of this file are subject to the Erlang Public License,
+%% Version 1.1, (the "License"); you may not use this file except in
+%% compliance with the License. You should have received a copy of the
+%% Erlang Public License along with this software. If not, it can be
+%% retrieved via the world wide web at http://www.erlang.org/.
+%% 
+%% Software distributed under the License is distributed on an "AS IS"
+%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+%% the License for the specific language governing rights and limitations
+%% under the License.
+%% 
+%% The Initial Developer of the Original Code is Ericsson Utvecklings AB.
+%% Portions created by Ericsson are Copyright 1999, Ericsson Utvecklings
+%% AB. All Rights Reserved.''
+%% 
+%%     $Id$
+%% 
+
+-module(ipc_tree).
+-export([go/1, init/2]).
+
+go(N) ->
+    start(N, self()),
+    receive stop -> ok end.
+
+start(Depth, ParentPid) ->
+    spawn(?MODULE, init, [Depth, ParentPid]).
+
+init(0, ParentPid) -> 
+    workload(5000),
+    ParentPid ! stop,
+    ok;
+init(Depth, ParentPid) ->
+    Pid1 = spawn(?MODULE, init, [Depth - 1, self()]),
+    Pid2 = spawn(?MODULE, init, [Depth - 1, self()]),
+    main([Pid1,Pid2], ParentPid).
+
+main(Pids, ParentPid) ->
+    workload(5000),
+    gather(Pids),
+    ParentPid ! stop,
+    ok.
+
+gather([]) -> ok;
+gather([_|Pids]) -> receive _ -> gather(Pids) end.
+
+workload(0) -> ok;
+workload(N) -> math:sin(2), workload(N - 1).
-- 
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