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%% Copyright (C) 2012 Björn-Egil Dahlberg
%%
%% File: code_parallel_load_SUITE.erl
%% Author: Björn-Egil Dahlberg
%% Created: 2012-01-19
-module(code_parallel_load_SUITE).
-export([
all/0,
suite/0,
init_per_suite/1,
end_per_suite/1,
init_per_testcase/2,
end_per_testcase/2
]).
-export([
parallel_load_check_purge_repeat/1
]).
-define(model, my_model).
-define(interval, 1500).
-define(number_of_processes, 160).
-define(passes, 4).
-include_lib("test_server/include/test_server.hrl").
suite() -> [{ct_hooks,[ts_install_cth]}].
all() ->
[parallel_load_check_purge_repeat].
init_per_suite(Config) ->
Config.
end_per_suite(_Config) ->
ok.
init_per_testcase(Func, Config) when is_atom(Func), is_list(Config) ->
Dog=?t:timetrap(?t:minutes(3)),
[{watchdog, Dog}|Config].
end_per_testcase(_Func, Config) ->
Dog=?config(watchdog, Config),
?t:timetrap_cancel(Dog).
parallel_load_check_purge_repeat(_Conf) ->
Ts = [v1,v2,v3,v4,v5,v6],
Codes = generate_codes(Ts),
setup_code_changer(Codes),
ok.
setup_code_changer([{Token,Code}|Cs] = Codes) ->
{module, ?model} = erlang:load_module(?model,Code),
Pids = setup_checkers(Token,?number_of_processes),
code_changer(Cs, Codes, ?interval,Pids,?passes),
ok.
code_changer(_, _, _, Pids, 0) ->
[exit(Pid, normal) || Pid <- Pids],
io:format("done~n"),
ok;
code_changer([], Codes, T, Pids, Ps) ->
code_changer(Codes, Codes, T, Pids, Ps - 1);
code_changer([{Token,Code}|Cs], Codes, T, Pids, Ps) ->
receive after T ->
io:format("load code with token ~4w : pass ~4w~n", [Token, Ps]),
%code:load_binary(?model, ?model, Code),
{module, ?model} = erlang:load_module(?model, Code),
% this is second time we call load_module for this module
% so it should have old code
[Pid ! {self(), change, Token} || Pid <- Pids],
% should we wait a moment or just blantantly try to check and purge repeatadly?
receive after 1 -> ok end,
ok = check_and_purge_processes_code(Pids, ?model),
code_changer(Cs, Codes, T, Pids, Ps)
end.
%% generate code that receives a token, code switches to new code
%% then matches this token against a literal code token
%% should be identical
%% (smoke test for parallel code loading
generate_codes([]) -> [];
generate_codes([T|Ts]) ->
[{T, generate(?model, [], [
format("check(T) -> receive {_Pid, change, T1} -> "
" ~w:check(T1)\n"
" after 0 -> T = f(), check(T) end.\n", [?model]),
format("f() -> ~w.~n", [T])
])} | generate_codes(Ts)].
%% aux
setup_checkers(_,0) -> [];
setup_checkers(T,N) -> [spawn_link(fun() -> ?model:check(T) end) | setup_checkers(T, N-1)].
check_and_purge_processes_code(Pids, M) ->
check_and_purge_processes_code(Pids, M, []).
check_and_purge_processes_code([], M, []) ->
erlang:purge_module(M),
ok;
check_and_purge_processes_code([], M, Pending) ->
io:format("Processes ~w are still executing old code - retrying.~n", [Pending]),
check_and_purge_processes_code(Pending, M, []);
check_and_purge_processes_code([Pid|Pids], M, Pending) ->
case erlang:check_process_code(Pid, M) of
false ->
check_and_purge_processes_code(Pids, M, Pending);
true ->
check_and_purge_processes_code(Pids, M, [Pid|Pending])
end.
generate(Module, Attributes, FunStrings) ->
FunForms = function_forms(FunStrings),
Forms = [
{attribute,1,module,Module},
{attribute,2,export,[FA || {FA,_} <- FunForms]}
] ++ [{attribute, 3, A, V}|| {A, V} <- Attributes] ++
[ Function || {_, Function} <- FunForms],
{ok, Module, Bin} = compile:forms(Forms),
Bin.
function_forms([]) -> [];
function_forms([S|Ss]) ->
{ok, Ts,_} = erl_scan:string(S),
{ok, Form} = erl_parse:parse_form(Ts),
Fun = element(3, Form),
Arity = element(4, Form),
[{{Fun,Arity}, Form}|function_forms(Ss)].
format(F,Ts) -> lists:flatten(io_lib:format(F, Ts)).
|
