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%% This tests the presence of possible races due to an ets:lookup/ets:insert
%% combination. It takes into account multiple ets:inserts that might exist.
-module(ets_insert_double2).
-export([start/2]).
start(Random, Pass) ->
io:format("Created ~w\n", [ets:new(foo, [named_table, public])]),
ets:insert(foo, {Random, random:uniform(150)}),
io:format("Inserted ~w\n", [{_, N}] = ets:lookup(foo, Random)),
case (N rem 2 == 0) of
true ->
io:format("\nInserted an even integer\n", []),
io:format("\nWill make it odd and generate new password\n", []),
ets:insert(foo, [{Random, N+1}, {Pass, generate_password(Pass, N)}]);
false ->
io:format("\nInserted an odd integer\n", []),
io:format("\nWill make it even and generate new password\n", []),
ets:insert(foo, [{Random, N+1}, {Pass, generate_password(Pass, N)}])
end,
io:format("Update complete\n", []),
ObjectList = ets:lookup(foo, Pass),
io:format("New password: ~w\n", [ObjectList]),
ets:insert(foo, {Pass, 'empty'}).
generate_password(Pass, N) ->
[{_, P}] = ets:lookup(foo, Pass),
lists:map(fun (_) -> random:uniform(90)+P+$\s+1 end, lists:seq(1,N)).
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