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.

---
 system/doc/tutorial/complex2.erl | 45 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 system/doc/tutorial/complex2.erl

(limited to 'system/doc/tutorial/complex2.erl')

diff --git a/system/doc/tutorial/complex2.erl b/system/doc/tutorial/complex2.erl
new file mode 100644
index 0000000000..93d00dab6b
--- /dev/null
+++ b/system/doc/tutorial/complex2.erl
@@ -0,0 +1,45 @@
+-module(complex2).
+-export([start/1, stop/0, init/1]).
+-export([foo/1, bar/1]).
+
+start(ExtPrg) ->
+    spawn(?MODULE, init, [ExtPrg]).
+stop() ->
+    complex ! stop.
+
+foo(X) ->
+    call_port({foo, X}).
+bar(Y) ->
+    call_port({bar, Y}).
+
+call_port(Msg) ->
+    complex ! {call, self(), Msg},
+    receive
+	{complex, Result} ->
+	    Result
+    end.
+
+init(ExtPrg) ->
+    register(complex, self()),
+    process_flag(trap_exit, true),
+    Port = open_port({spawn, ExtPrg}, [{packet, 2}, binary]),
+    loop(Port).
+
+loop(Port) ->
+    receive
+	{call, Caller, Msg} ->
+	    Port ! {self(), {command, term_to_binary(Msg)}},
+	    receive
+		{Port, {data, Data}} ->
+		    Caller ! {complex, binary_to_term(Data)}
+	    end,
+	    loop(Port);
+	stop ->
+	    Port ! {self(), close},
+	    receive
+		{Port, closed} ->
+		    exit(normal)
+	    end;
+	{'EXIT', Port, Reason} ->
+	    exit(port_terminated)
+    end.
-- 
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