The R13B03 release.OTP_R13B03

1 files changed, 30 insertions, 0 deletions

diff --git a/lib/percept/doc/src/ipc_tree.erl b/lib/percept/doc/src/ipc_tree.erl
new file mode 100644
index 0000000000..89360379c6
--- /dev/null
+++ b/lib/percept/doc/src/ipc_tree.erl
@@ -0,0 +1,30 @@
+-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 ! {self(),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 ! {self(),stop},
+    ok.
+
+gather([]) -> ok;
+gather([Pid|Pids]) -> receive {Pid,stop} -> gather(Pids) end.
+
+workload(0) -> ok;
+workload(N) -> math:sin(2), workload(N - 1).