1 files changed, 58 insertions, 0 deletions
diff --git a/lib/sasl/doc/src/rel/sp.2.erl b/lib/sasl/doc/src/rel/sp.2.erl
new file mode 100644
index 0000000000..b2282f0610
--- /dev/null
+++ b/lib/sasl/doc/src/rel/sp.2.erl
@@ -0,0 +1,58 @@
+-module(sp).
+-vsn(2).
+
+-export([start/0, get_data/0, set_data/1]).
+-export([init/1, system_continue/3, system_terminate/4, 
+        system_code_change/4]).
+
+-record(state, {data, last_pid}).
+
+start() ->
+    Pid = proc_lib:spawn_link(?MODULE, init, [self()]),
+    {ok, Pid}.
+
+get_data() ->
+    sp_server ! {self(), get_data},
+    receive
+	{sp_server, Data} -> Data
+    end.
+
+set_data(Data) ->
+    sp_server ! {self(), set_data, Data}.
+
+init(Parent) ->
+    register(sp_server, self()),
+    process_flag(trap_exit, true),
+    loop(#state{last_pid = no_one}, Parent).
+
+loop(State, Parent) ->
+    receive
+	{system, From, Request} ->
+	    sys:handle_system_msg(Request, From, Parent, 
+				  ?MODULE, [], State);
+	{'EXIT', Parent, Reason} ->
+	    cleanup(State),
+	    exit(Reason);
+	{From, get_data} ->
+	    From ! {sp_server, State#state.data},
+	    loop(State, Parent);
+	{From, set_data, Data} ->
+	    loop(State#state{data = Data, last_pid = From}, Parent);
+	_Any ->
+	    loop(State, Parent)
+    end.
+
+cleanup(State) -> ok.
+
+%% Here are the sys call back functions
+system_continue(Parent, _, State) ->
+    loop(State, Parent).
+
+system_terminate(Reason, Parent, _, State) ->
+    cleanup(State),
+    exit(Reason).
+
+system_code_change({state, Data}, _Mod, 1, _Extra) ->
+    {ok, #state{data = Data, last_pid = no_one}};
+system_code_change(#state{data = Data}, _Mod, {down, 1}, _Extra) ->
+    {ok, {state, Data}}.