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authorErlang/OTP <[email protected]>2009-11-20 14:54:40 +0000
committerErlang/OTP <[email protected]>2009-11-20 14:54:40 +0000
commit84adefa331c4159d432d22840663c38f155cd4c1 (patch)
treebff9a9c66adda4df2106dfd0e5c053ab182a12bd /system/doc/tutorial/complex1.erl
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The R13B03 release.OTP_R13B03
Diffstat (limited to 'system/doc/tutorial/complex1.erl')
-rw-r--r--system/doc/tutorial/complex1.erl50
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diff --git a/system/doc/tutorial/complex1.erl b/system/doc/tutorial/complex1.erl
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+-module(complex1).
+-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}]),
+ loop(Port).
+
+loop(Port) ->
+ receive
+ {call, Caller, Msg} ->
+ Port ! {self(), {command, encode(Msg)}},
+ receive
+ {Port, {data, Data}} ->
+ Caller ! {complex, decode(Data)}
+ end,
+ loop(Port);
+ stop ->
+ Port ! {self(), close},
+ receive
+ {Port, closed} ->
+ exit(normal)
+ end;
+ {'EXIT', Port, Reason} ->
+ exit(port_terminated)
+ end.
+
+encode({foo, X}) -> [1, X];
+encode({bar, Y}) -> [2, Y].
+
+decode([Int]) -> Int.