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-rw-r--r--erts/example/pg_async2.erl53
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diff --git a/erts/example/pg_async2.erl b/erts/example/pg_async2.erl
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+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2006-2009. All Rights Reserved.
+%%
+%% 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 online 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.
+%%
+%% %CopyrightEnd%
+%%
+-module(pg_async2).
+
+-define(DRV_CONNECT, 1).
+-define(DRV_DISCONNECT, 2).
+-define(DRV_SELECT, 3).
+
+-export([connect/1, disconnect/1, select/2]).
+
+connect(ConnectStr) ->
+ case erl_ddll:load_driver(".", "pg_async2") of
+ ok -> ok;
+ {error, already_loaded} -> ok;
+ _ -> exit({error, could_not_load_driver})
+ end,
+ Port = open_port({spawn, ?MODULE}, [binary]),
+ port_control(Port, ?DRV_CONNECT, ConnectStr),
+ case return_port_data(Port) of
+ ok -> {ok, Port};
+ Error -> Error
+ end.
+
+disconnect(Port) ->
+ port_control(Port, ?DRV_DISCONNECT, ""),
+ return_port_data(Port).
+
+select(Port, Query) ->
+ port_control(Port, ?DRV_SELECT, Query),
+ return_port_data(Port).
+
+return_port_data(Port) ->
+ receive
+ {Port, {data, Data}} ->
+ binary_to_term(Data)
+ end.
+