%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1997-2013. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% %CopyrightEnd%
%%
-module(time_SUITE).
-compile({nowarn_deprecated_function, {erlang,now,0}}).
%% "Time is on my side." -- The Rolling Stones
%% Tests the BIFs:
%% erlang:localtime_to_universaltime/1
%% erlang:universaltime_to_localtime/1
%% date/0
%% time/0
%% now/0
%%
-export([all/0, suite/0,groups/0,init_per_suite/1, end_per_suite/1,
init_per_group/2,end_per_group/2, univ_to_local/1, local_to_univ/1,
bad_univ_to_local/1, bad_local_to_univ/1,
univ_to_seconds/1, seconds_to_univ/1,
consistency/1,
now_unique/1, now_update/1, timestamp/1,
time_warp_modes/1,
monotonic_time_monotonicity/1,
monotonic_time_monotonicity_parallel/1,
time_unit_conversion/1,
signed_time_unit_conversion/1,
erlang_timestamp/1]).
-export([init_per_testcase/2, end_per_testcase/2]).
-export([local_to_univ_utc/1]).
-include_lib("test_server/include/test_server.hrl").
-export([linear_time/1]).
%% The following defines the timezone in which the test is run.
%% It is interpreted as the number of hours to be added to UTC
%% to obtain the local time. The number will be positive east
%% of Greenwhich, negative west of Greenwhich.
%%
%% Allowable range is -12 through 11.
-define(timezone, 1).
%% Similarly to timezone, but the difference when Daylight Saving Time
%% is in use. [Same range.]
-define(dst_timezone, 2).
init_per_testcase(Func, Config) when is_atom(Func), is_list(Config) ->
[{testcase, Func}|Config].
end_per_testcase(_Func, _Config) ->
ok.
suite() -> [{ct_hooks,[ts_install_cth]}].
all() ->
[univ_to_local, local_to_univ, local_to_univ_utc,
bad_univ_to_local, bad_local_to_univ,
univ_to_seconds, seconds_to_univ,
consistency,
{group, now}, timestamp,
time_warp_modes,
monotonic_time_monotonicity,
monotonic_time_monotonicity_parallel,
time_unit_conversion,
signed_time_unit_conversion,
erlang_timestamp].
groups() ->
[{now, [], [now_unique, now_update]}].
init_per_suite(Config) ->
Config.
end_per_suite(_Config) ->
ok.
init_per_group(_GroupName, Config) ->
Config.
end_per_group(_GroupName, Config) ->
Config.
local_to_univ_utc(suite) ->
[];
local_to_univ_utc(doc) ->
["Test that DST = true on timezones without DST is ignored"];
local_to_univ_utc(Config) when is_list(Config) ->
case os:type() of
{unix,_} ->
%% TZ variable has a meaning
?line {ok, Node} =
test_server:start_node(local_univ_utc,peer,
[{args, "-env TZ UTC"}]),
?line {{2008,8,1},{0,0,0}} =
rpc:call(Node,
erlang,localtime_to_universaltime,
[{{2008, 8, 1}, {0, 0, 0}},
false]),
?line {{2008,8,1},{0,0,0}} =
rpc:call(Node,
erlang,localtime_to_universaltime,
[{{2008, 8, 1}, {0, 0, 0}},
true]),
?line [{{2008,8,1},{0,0,0}}] =
rpc:call(Node,
calendar,local_time_to_universal_time_dst,
[{{2008, 8, 1}, {0, 0, 0}}]),
?line test_server:stop_node(Node),
ok;
_ ->
{skip,"Only valid on Unix"}
end.
%% Tests conversion from univeral to local time.
univ_to_local(Config) when is_list(Config) ->
?line test_univ_to_local(test_data()).
test_univ_to_local([{Utc, Local}|Rest]) ->
?line io:format("Testing ~p => ~p~n", [Local, Utc]),
?line Local = erlang:universaltime_to_localtime(Utc),
?line test_univ_to_local(Rest);
test_univ_to_local([]) ->
ok.
%% Tests conversion from local to universal time.
local_to_univ(Config) when is_list(Config) ->
?line test_local_to_univ(test_data()).
test_local_to_univ([{Utc, Local}|Rest]) ->
?line io:format("Testing ~p => ~p~n", [Utc, Local]),
?line Utc = erlang:localtime_to_universaltime(Local),
?line test_local_to_univ(Rest);
test_local_to_univ([]) ->
ok.
%% Test bad arguments to erlang:universaltime_to_localtime; should
%% generate a badarg.
bad_univ_to_local(Config) when is_list(Config) ->
?line bad_test_univ_to_local(bad_dates()).
bad_test_univ_to_local([Utc|Rest]) ->
?line io:format("Testing ~p~n", [Utc]),
?line case catch erlang:universaltime_to_localtime(Utc) of
{'EXIT', {badarg, _}} -> bad_test_univ_to_local(Rest)
end;
bad_test_univ_to_local([]) ->
ok.
%% Test bad arguments to erlang:localtime_to_universaltime/1; should
%% generate a badarg.
bad_local_to_univ(Config) when is_list(Config) ->
?line bad_test_local_to_univ(bad_dates()).
bad_test_local_to_univ([Local|Rest]) ->
?line io:format("Testing ~p~n", [Local]),
?line case catch erlang:localtime_to_universaltime(Local) of
{'EXIT', {badarg, _}} -> bad_test_local_to_univ(Rest)
end;
bad_test_local_to_univ([]) ->
ok.
%% Test universaltime to seconds conversions
univ_to_seconds(Config) when is_list(Config) ->
test_univ_to_seconds(ok_utc_seconds()).
test_univ_to_seconds([{Datetime, Seconds}|DSs]) ->
io:format("universaltime = ~p -> seconds = ~p", [Datetime, Seconds]),
Seconds = erlang:universaltime_to_posixtime(Datetime),
test_univ_to_seconds(DSs);
test_univ_to_seconds([]) ->
ok.
%% Test seconds to universaltime conversions
seconds_to_univ(Config) when is_list(Config) ->
test_seconds_to_univ(ok_utc_seconds()).
test_seconds_to_univ([{Datetime, Seconds}|DSs]) ->
io:format("universaltime = ~p <- seconds = ~p", [Datetime, Seconds]),
Datetime = erlang:posixtime_to_universaltime(Seconds),
test_seconds_to_univ(DSs);
test_seconds_to_univ([]) ->
ok.
%% Test that the the different time functions return
%% consistent results. (See the test case for assumptions
%% and limitations.)
consistency(Config) when is_list(Config) ->
%% Test the following equations:
%% date() & time() == erlang:localtime()
%% erlang:universaltime() + timezone == erlang:localtime()
%%
%% Assumptions:
%% Middle-European time zone, EU rules for daylight-saving time.
%%
%% Limitations:
%% Localtime and universaltime must be in the same month.
%% Daylight-saving calculations are incorrect from the last
%% Sunday of March and October to the end of the month.
?line ok = compare_date_time_and_localtime(16),
?line ok = compare_local_and_universal(16).
compare_date_time_and_localtime(Times) when Times > 0 ->
?line {Year, Mon, Day} = date(),
?line {Hour, Min, Sec} = time(),
?line case erlang:localtime() of
{{Year, Mon, Day}, {Hour, Min, Sec}} -> ok;
_ -> compare_date_time_and_localtime(Times-1)
end;
compare_date_time_and_localtime(0) ->
error.
compare_local_and_universal(Times) when Times > 0 ->
case compare(erlang:universaltime(), erlang:localtime()) of
true -> ok;
false -> compare_local_and_universal(Times-1)
end;
compare_local_and_universal(0) ->
error.
compare(Utc0, Local) ->
io:format("local = ~p, utc = ~p", [Local, Utc0]),
Utc = linear_time(Utc0)+effective_timezone(Utc0)*3600,
case linear_time(Local) of
Utc -> true;
Other ->
io:format("Failed: local = ~p, utc = ~p~n",
[Other, Utc]),
false
end.
%% This function converts a date and time to a linear time.
%% Two linear times can be subtracted to give their difference
%% in seconds.
%%
%% XXX Limitations: Simplified leap year calc will fail for 2100 :-)
linear_time({{Year, Mon, Day}, {Hour, Min, Sec}}) ->
86400*(year_to_days(Year) + month_to_days(Year,Mon) + (Day-1)) +
3600*Hour + 60*Min + Sec.
year_to_days(Year) ->
Year * 365 + (Year-1) div 4.
month_to_days(Year, Mon) ->
DoM = [31,days_in_february(Year),31,30,31,30,31,31,30,31,30,31],
{PastMonths,_} = lists:split(Mon-1, DoM),
lists:sum(PastMonths).
days_in_february(Year) ->
case (Year rem 4) of
0 -> 29;
_ -> 28
end.
%% This functions returns either the normal timezone or the
%% the DST timezone, depending on the given UTC time.
%%
%% XXX This function uses an approximation of the EU rule for
%% daylight saving time. This function will fail in the
%% following intervals: After the last Sunday in March upto
%% the end of March, and after the last Sunday in October
%% upto the end of October.
effective_timezone(Time) ->
case os:type() of
{unix,_} ->
case os:cmd("date '+%Z'") of
"SAST"++_ ->
2;
_ ->
effective_timezone1(Time)
end;
_ ->
effective_timezone1(Time)
end.
effective_timezone1({{_Year,Mon,_Day}, _}) when Mon < 4 ->
?timezone;
effective_timezone1({{_Year,Mon,_Day}, _}) when Mon > 10 ->
?timezone;
effective_timezone1(_) ->
?dst_timezone.
%% Test (the bif) os:timestamp/0, which is something quite like, but not
%% similar to erlang:now...
timestamp(suite) ->
[];
timestamp(doc) ->
["Test that os:timestamp works."];
timestamp(Config) when is_list(Config) ->
repeating_timestamp_check(100000).
repeating_timestamp_check(0) ->
ok;
repeating_timestamp_check(N) ->
{A,B,C} = TS = os:timestamp(),
if
is_integer(A),
is_integer(B),
is_integer(C),
B < 1000000,
C < 1000000 ->
ok;
true ->
test_server:fail(
lists:flatten(
io_lib:format("Strange return from os:timestamp/0 ~w~n",[TS])))
end,
%% I assume the now and timestamp should not differ more than 1 hour,
%% which is safe assuming the system has not had a large time-warp
%% during the testrun...
Secs = A*1000000+B+round(C/1000000),
{NA,NB,NC} = erlang:now(),
NSecs = NA*1000000+NB+round(NC/1000000),
case Secs - NSecs of
TooLarge when TooLarge > 3600 ->
test_server:fail(
lists:flatten(
io_lib:format("os:timestamp/0 is ~w s more than erlang:now/0",
[TooLarge])));
TooSmall when TooSmall < -3600 ->
test_server:fail(
lists:flatten(
io_lib:format("os:timestamp/0 is ~w s less than erlang:now/0",
[-TooSmall])));
_ ->
ok
end,
repeating_timestamp_check(N-1).
%% Test now/0.
%% Tests that successive calls to now/0 returns different values.
%% Also returns a comment string with the median difference between
%% times (in microseconds).
now_unique(Config) when is_list(Config) ->
?line now_unique(1000, now(), []),
?line fast_now_unique(100000, now()).
now_unique(N, Previous, Result) when N > 0 ->
?line case now() of
Previous ->
test_server:fail("now/0 returned the same value twice");
New ->
now_unique(N-1, New, [New|Result])
end;
now_unique(0, _, [Then|Rest]) ->
?line now_calc_increment(Rest, microsecs(Then), []).
now_calc_increment([Then|Rest], Previous, _Result) ->
?line This = microsecs(Then),
?line now_calc_increment(Rest, This, [Previous-This]);
now_calc_increment([], _, Differences) ->
{comment, "Median increment: " ++ integer_to_list(median(Differences))}.
fast_now_unique(0, _) -> ok;
fast_now_unique(N, Then) ->
case now() of
Then ->
?line ?t:fail("now/0 returned the same value twice");
Now ->
fast_now_unique(N-1, Now)
end.
median(Unsorted_List) ->
?line Length = length(Unsorted_List),
?line List = lists:sort(Unsorted_List),
?line case Length rem 2 of
0 -> % Even length.
[A, B] = lists:nthtail((Length div 2)-1, List),
(A+B)/2;
1 -> % Odd list length.
lists:nth((Length div 2)+1, List)
end.
microsecs({Mega_Secs, Secs, Microsecs}) ->
(Mega_Secs*1000000+Secs)*1000000+Microsecs.
%% Test that the time differences returned by two calls to
%% now/0 one second apart is comparable to the difference of two
%% calls to erlang:localtime().
now_update(Config) when is_list(Config) ->
case ?t:is_debug() of
false -> ?line now_update1(10);
true -> {skip,"Unreliable in DEBUG build"}
end.
now_update1(N) when N > 0 ->
?line T1_linear = linear_time(erlang:localtime()),
?line T1_now = microsecs(now()),
?line receive after 1008 -> ok end,
?line T2_linear = linear_time(erlang:localtime()),
?line T2_now = microsecs(now()),
?line Linear_Diff = (T2_linear-T1_linear)*1000000,
?line Now_Diff = T2_now-T1_now,
test_server:format("Localtime diff = ~p; now() diff = ~p",
[Linear_Diff, Now_Diff]),
?line case abs(Linear_Diff - Now_Diff) of
Abs_Delta when Abs_Delta =< 40000 -> ok;
_ -> now_update1(N-1)
end;
now_update1(0) ->
?line test_server:fail().
time_warp_modes(Config) when is_list(Config) ->
%% All time warp modes always supported in
%% combination with no time correction...
check_time_warp_mode(Config, false, no_time_warp),
check_time_warp_mode(Config, false, single_time_warp),
check_time_warp_mode(Config, false, multi_time_warp),
erts_debug:set_internal_state(available_internal_state, true),
try
case erts_debug:get_internal_state({check_time_config,
true, no_time_warp}) of
false -> ok;
true -> check_time_warp_mode(Config, true, no_time_warp)
end,
case erts_debug:get_internal_state({check_time_config,
true, single_time_warp}) of
false -> ok;
true -> check_time_warp_mode(Config, true, single_time_warp)
end,
case erts_debug:get_internal_state({check_time_config,
true, multi_time_warp}) of
false -> ok;
true -> check_time_warp_mode(Config, true, multi_time_warp)
end
after
erts_debug:set_internal_state(available_internal_state, false)
end.
check_time_warp_mode(Config, TimeCorrection, TimeWarpMode) ->
io:format("~n~n~n***** Testing TimeCorrection=~p TimeWarpMode=~p *****~n",
[TimeCorrection, TimeWarpMode]),
Mon = erlang:monitor(time_offset, clock_service),
_ = erlang:time_offset(),
Start = erlang:monotonic_time(1000),
MonotonicityTimeout = 2000,
{ok, Node} = start_node(Config,
"+c " ++ atom_to_list(TimeCorrection)
++ " +C " ++ atom_to_list(TimeWarpMode)),
StartTime = rpc:call(Node, erlang, system_info, [start_time]),
Me = self(),
MonotincityTestStarted = make_ref(),
MonotincityTestDone = make_ref(),
spawn_link(Node,
fun () ->
Me ! MonotincityTestStarted,
cmp_times(erlang:start_timer(MonotonicityTimeout,
self(),
timeout),
erlang:monotonic_time()),
Me ! MonotincityTestDone
end),
receive MonotincityTestStarted -> ok end,
check_time_offset(Node, TimeWarpMode),
TimeWarpMode = rpc:call(Node, erlang, system_info, [time_warp_mode]),
TimeCorrection = rpc:call(Node, erlang, system_info, [time_correction]),
receive MonotincityTestDone -> ok end,
MonotonicTime = rpc:call(Node, erlang, monotonic_time, []),
MonotonicTimeUnit = rpc:call(Node,
erlang,
convert_time_unit,
[1, seconds, native]),
UpMilliSeconds = erlang:convert_time_unit(MonotonicTime - StartTime,
MonotonicTimeUnit,
milli_seconds),
io:format("UpMilliSeconds=~p~n", [UpMilliSeconds]),
End = erlang:monotonic_time(milli_seconds),
stop_node(Node),
try
true = (UpMilliSeconds > (98*MonotonicityTimeout) div 100),
true = (UpMilliSeconds < (102*(End-Start)) div 100)
catch
error:_ ->
io:format("Uptime inconsistency", []),
case {TimeCorrection, erlang:system_info(time_correction)} of
{true, true} ->
?t:fail(uptime_inconsistency);
{true, false} ->
_ = erlang:time_offset(),
receive
{'CHANGE', Mon, time_offset, clock_service, _} ->
ignore
after 1000 ->
?t:fail(uptime_inconsistency)
end;
_ ->
ignore
end
end,
erlang:demonitor(Mon, [flush]),
ok.
check_time_offset(Node, no_time_warp) ->
final = rpc:call(Node, erlang, system_info, [time_offset]),
final = rpc:call(Node, erlang, system_flag, [time_offset, finalize]),
final = rpc:call(Node, erlang, system_info, [time_offset]);
check_time_offset(Node, single_time_warp) ->
preliminary = rpc:call(Node, erlang, system_info, [time_offset]),
preliminary = rpc:call(Node, erlang, system_flag, [time_offset, finalize]),
final = rpc:call(Node, erlang, system_info, [time_offset]),
final = rpc:call(Node, erlang, system_flag, [time_offset, finalize]);
check_time_offset(Node, multi_time_warp) ->
volatile = rpc:call(Node, erlang, system_info, [time_offset]),
volatile = rpc:call(Node, erlang, system_flag, [time_offset, finalize]),
volatile = rpc:call(Node, erlang, system_info, [time_offset]).
monotonic_time_monotonicity(Config) when is_list(Config) ->
Done = erlang:start_timer(10000,self(),timeout),
cmp_times(Done, erlang:monotonic_time()).
cmp_times(Done, X0) ->
X1 = erlang:monotonic_time(),
X2 = erlang:monotonic_time(),
X3 = erlang:monotonic_time(),
X4 = erlang:monotonic_time(),
X5 = erlang:monotonic_time(),
true = (X0 =< X1),
true = (X1 =< X2),
true = (X2 =< X3),
true = (X3 =< X4),
true = (X4 =< X5),
receive
{timeout, Done, timeout} ->
ok
after 0 ->
cmp_times(Done, X5)
end.
-define(NR_OF_MONOTONIC_CALLS, 100000).
monotonic_time_monotonicity_parallel(Config) when is_list(Config) ->
Me = self(),
Result = make_ref(),
Go = make_ref(),
UpAndRunning = make_ref(),
NoOnlnScheds = erlang:system_info(schedulers_online),
OffsetUI = erlang:unique_integer([monotonic]),
OffsetMT = erlang:monotonic_time(),
MinHSz = ?NR_OF_MONOTONIC_CALLS*(2
+ 3
+ erts_debug:flat_size(OffsetUI)
+ erts_debug:flat_size(OffsetMT)),
Ps = lists:map(
fun (Sched) ->
spawn_opt(
fun () ->
Me ! {self(), UpAndRunning},
receive Go -> ok end,
Res = fetch_monotonic(?NR_OF_MONOTONIC_CALLS, []),
Me ! {self(), Result, Sched, Res}
end,
[{scheduler, Sched},
{priority, max},
{min_heap_size, MinHSz}])
end,
lists:seq(1, NoOnlnScheds)),
lists:foreach(fun (P) -> receive {P, UpAndRunning} -> ok end end, Ps),
lists:foreach(fun (P) -> P ! Go end, Ps),
TMs = recv_monotonics(Result, OffsetMT, OffsetUI, NoOnlnScheds, []),
true = check_monotonic_result(TMs, OffsetMT, OffsetUI, true).
check_monotonic_result([{_Sched, _PrevUI, _MT, _PostUI}],
_OffsetMT, _OffsetUI, Res) ->
Res;
check_monotonic_result([{_ASched, _APrevUI, AMT, APostUI} = A,
{_BSched, BPrevUI, BMT, _BPostUI} = B | _] = L,
OffsetMT, OffsetUI, Res) ->
NewRes = case (AMT =< BMT) orelse (BPrevUI < APostUI) of
true ->
Res;
false ->
io:format("INCONSISTENCY: ~p ~p~n", [A, B]),
false
end,
check_monotonic_result(tl(L), OffsetMT, OffsetUI, NewRes).
recv_monotonics(_Result, _OffsetMT, _OffsetUI, 0, Acc) ->
lists:keysort(2, Acc);
recv_monotonics(Result, OffsetMT, OffsetUI, N, Acc) ->
receive
{_, Result, Sched, Res} ->
CRes = convert_monotonic(Sched, OffsetMT, OffsetUI, Res, []),
recv_monotonics(Result, OffsetMT, OffsetUI, N-1, CRes ++ Acc)
end.
convert_monotonic(_Sched, _OffsetMT, _OffsetUI, [{_MT, _UI}], Acc) ->
Acc;
convert_monotonic(Sched, OffsetMT, OffsetUI,
[{MT, UI}, {_PrevMT, PrevUI} | _] = L, Acc) ->
convert_monotonic(Sched, OffsetMT, OffsetUI, tl(L),
[{Sched, PrevUI-OffsetUI, MT-OffsetMT, UI-OffsetUI}
| Acc]).
fetch_monotonic(0, Acc) ->
Acc;
fetch_monotonic(N, Acc) ->
MT = erlang:monotonic_time(),
UI = erlang:unique_integer([monotonic]),
fetch_monotonic(N-1, [{MT, UI} | Acc]).
-define(CHK_RES_CONVS_TIMEOUT, 400).
time_unit_conversion(Config) when is_list(Config) ->
Mon = erlang:monitor(time_offset, clock_service),
start_check_res_convs(Mon, 1000000000000),
start_check_res_convs(Mon, 2333333333333),
start_check_res_convs(Mon, 5732678356789),
erlang:demonitor(Mon, [flush]).
start_check_res_convs(Mon, Res) ->
io:format("Checking ~p time_unit~n", [Res]),
check_res_convs(Mon,
erlang:start_timer(?CHK_RES_CONVS_TIMEOUT,
self(),
timeout),
Res).
check_res_convs(Mon, Done, Res) ->
receive
{timeout, Done, timeout} ->
case Res div 10 of
0 ->
ok;
NewRes ->
start_check_res_convs(Mon, NewRes)
end
after 0 ->
do_check_res_convs(Mon, Done, Res)
end.
do_check_res_convs(Mon, Done, Res) ->
TStart = erlang:monotonic_time(),
T = erlang:monotonic_time(Res),
TEnd = erlang:monotonic_time(),
TMin = erlang:convert_time_unit(TStart, native, Res),
TMax = erlang:convert_time_unit(TEnd, native, Res),
%io:format("~p =< ~p =< ~p~n", [TMin, T, TEnd]),
true = (TMin =< T),
true = (TMax >= T),
check_time_offset_res_conv(Mon, Res),
check_res_convs(Mon, Done, Res).
check_time_offset_res_conv(Mon, Res) ->
TORes = erlang:time_offset(Res),
TO = erlang:time_offset(),
case erlang:convert_time_unit(TO, native, Res) of
TORes ->
ok;
TORes2 ->
case check_time_offset_change(Mon, TO, 1000) of
{TO, false} ->
?t:fail({time_unit_conversion_inconsistency,
TO, TORes, TORes2});
{_NewTO, true} ->
?t:format("time_offset changed", []),
check_time_offset_res_conv(Mon, Res)
end
end.
signed_time_unit_conversion(Config) when is_list(Config) ->
chk_strc(1000000000, 1000000),
chk_strc(1000000000, 1000),
chk_strc(1000000000, 1),
chk_strc(1000000, 1000),
chk_strc(1000000, 1),
chk_strc(1000, 1),
chk_strc(4711, 17),
chk_strc(1 bsl 10, 1),
chk_strc(1 bsl 16, 10),
chk_strc(1 bsl 17, 1 bsl 8),
chk_strc((1 bsl 17) + 1, (1 bsl 8) - 1),
chk_strc(1 bsl 17, 11),
ok.
chk_strc(Res0, Res1) ->
case (Res0 /= Res1) andalso (Res0 =< 1000000) andalso (Res1 =< 1000000) of
true ->
{FromRes, ToRes} = case Res0 > Res1 of
true -> {Res0, Res1};
false -> {Res1, Res0}
end,
MinFromValuesPerToValue = FromRes div ToRes,
MaxFromValuesPerToValue = ((FromRes-1) div ToRes)+1,
io:format("~p -> ~p [~p, ~p]~n",
[FromRes, ToRes,
MinFromValuesPerToValue, MaxFromValuesPerToValue]),
chk_values_per_value(FromRes, ToRes,
-10*FromRes, 10*FromRes,
MinFromValuesPerToValue,
MaxFromValuesPerToValue,
undefined, MinFromValuesPerToValue);
_ ->
ok
end,
chk_random_values(Res0, Res1),
chk_random_values(Res1, Res0),
ok.
chk_random_values(FR, TR) ->
io:format("rand values ~p -> ~p~n", [FR, TR]),
rand:seed(exsplus, {268438039,268440479,268439161}),
Values = lists:map(fun (_) -> rand:uniform(1 bsl 65) - (1 bsl 64) end,
lists:seq(1, 100000)),
CheckFun = fun (V) ->
CV = erlang:convert_time_unit(V, FR, TR),
case {(FR*CV) div TR =< V,
(FR*(CV+1)) div TR >= V} of
{true, true} ->
ok;
Failure ->
?t:fail({Failure, CV, V, FR, TR})
end
end,
lists:foreach(CheckFun, Values).
chk_values_per_value(_FromRes, _ToRes,
EndValue, EndValue,
MinFromValuesPerToValue, MaxFromValuesPerToValue,
_ToValue, FromValueCount) ->
% io:format("~p [~p]~n", [EndValue, FromValueCount]),
case ((MinFromValuesPerToValue =< FromValueCount)
andalso (FromValueCount =< MaxFromValuesPerToValue)) of
false ->
?t:fail({MinFromValuesPerToValue,
FromValueCount,
MaxFromValuesPerToValue});
true ->
ok
end;
chk_values_per_value(FromRes, ToRes, Value, EndValue,
MinFromValuesPerToValue, MaxFromValuesPerToValue,
ToValue, FromValueCount) ->
case erlang:convert_time_unit(Value, FromRes, ToRes) of
ToValue ->
chk_values_per_value(FromRes, ToRes,
Value+1, EndValue,
MinFromValuesPerToValue,
MaxFromValuesPerToValue,
ToValue, FromValueCount+1);
NewToValue ->
case ((MinFromValuesPerToValue =< FromValueCount)
andalso (FromValueCount =< MaxFromValuesPerToValue)) of
false ->
?t:fail({MinFromValuesPerToValue,
FromValueCount,
MaxFromValuesPerToValue});
true ->
% io:format("~p -> ~p [~p]~n",
% [Value, NewToValue, FromValueCount]),
chk_values_per_value(FromRes, ToRes,
Value+1, EndValue,
MinFromValuesPerToValue,
MaxFromValuesPerToValue,
NewToValue, 1)
end
end.
erlang_timestamp(Config) when is_list(Config) ->
Mon = erlang:monitor(time_offset, clock_service),
{TO, _} = check_time_offset_change(Mon,
erlang:time_offset(),
0),
Done = erlang:start_timer(10000,self(),timeout),
ok = check_erlang_timestamp(Done, Mon, TO).
check_erlang_timestamp(Done, Mon, TO) ->
receive
{timeout, Done, timeout} ->
erlang:demonitor(Mon, [flush]),
ok
after 0 ->
do_check_erlang_timestamp(Done, Mon, TO)
end.
do_check_erlang_timestamp(Done, Mon, TO) ->
MinMon = erlang:monotonic_time(),
{MegaSec, Sec, MicroSec} = erlang:timestamp(),
MaxMon = erlang:monotonic_time(),
TsMin = erlang:convert_time_unit(MinMon+TO,
native,
micro_seconds),
TsMax = erlang:convert_time_unit(MaxMon+TO,
native,
micro_seconds),
TsTime = (MegaSec*1000000+Sec)*1000000+MicroSec,
case (TsMin =< TsTime) andalso (TsTime =< TsMax) of
true ->
NewTO = case erlang:time_offset() of
TO ->
TO;
_ ->
check_time_offset_change(Mon, TO, 0)
end,
check_erlang_timestamp(Done, Mon, NewTO);
false ->
io:format("TsMin=~p TsTime=~p TsMax=~p~n", [TsMin, TsTime, TsMax]),
?t:format("Detected inconsistency; "
"checking for time_offset change...", []),
case check_time_offset_change(Mon, TO, 1000) of
{TO, false} ->
?t:fail(timestamp_inconsistency);
{NewTO, true} ->
?t:format("time_offset changed", []),
check_erlang_timestamp(Done, Mon, NewTO)
end
end.
check_time_offset_change(Mon, TO, Wait) ->
process_changed_time_offset(Mon, TO, false, Wait).
process_changed_time_offset(Mon, TO, Changed, Wait) ->
receive
{'CHANGE', Mon, time_offset, clock_service, NewTO} ->
process_changed_time_offset(Mon, NewTO, true, Wait)
after Wait ->
case erlang:time_offset() of
TO ->
{TO, Changed};
_OtherTO ->
receive
{'CHANGE', Mon, time_offset, clock_service, NewTO} ->
process_changed_time_offset(Mon, NewTO, true, Wait)
end
end
end.
%% Returns the test data: a list of {Utc, Local} tuples.
test_data() ->
{TZ,DSTTZ} =
case os:type() of
{unix,_} ->
case os:cmd("date '+%Z'") of
"SAST"++_ ->
{2,2};
_ ->
{?timezone,?dst_timezone}
end;
_ ->
{?timezone,?dst_timezone}
end,
?line test_data(nondst_dates(), TZ) ++
test_data(dst_dates(), DSTTZ) ++
crossover_test_data(crossover_dates(), TZ).
%% test_data1() ->
%% ?line test_data(nondst_dates(), ?timezone) ++
%% test_data(dst_dates(), ?dst_timezone) ++
%% crossover_test_data(crossover_dates(), ?timezone).
crossover_test_data([{Year, Month, Day}|Rest], TimeZone) when TimeZone > 0 ->
Hour = 23,
Min = 35,
Sec = 55,
?line Utc = {{Year, Month, Day}, {Hour, Min, Sec}},
?line Local = {{Year, Month, Day+1}, {Hour+TimeZone-24, Min, Sec}},
?line [{Utc, Local}|crossover_test_data(Rest, TimeZone)];
crossover_test_data([{Year, Month, Day}|Rest], TimeZone) when TimeZone < 0 ->
Hour = 0,
Min = 23,
Sec = 12,
?line Utc = {{Year, Month, Day}, {Hour, Min, Sec}},
?line Local = {{Year, Month, Day-1}, {Hour+TimeZone+24, Min, Sec}},
?line [{Utc, Local}|crossover_test_data(Rest, TimeZone)];
crossover_test_data([], _) ->
[].
test_data([Date|Rest], TimeZone) ->
Hour = 12,
Min = 45,
Sec = 7,
?line Utc = {Date, {Hour, Min, Sec}},
?line Local = {Date, {Hour+TimeZone, Min, Sec}},
?line [{Utc, Local}|test_data(Rest, TimeZone)];
test_data([], _) ->
[].
nondst_dates() ->
[{1996, 01, 30},
{1997, 01, 30},
{1998, 01, 30},
{1999, 01, 30},
{1996, 02, 29},
{1997, 02, 28},
{1998, 02, 28},
{1999, 02, 28},
{1996, 03, 2},
{1997, 03, 2},
{1998, 03, 2},
{1999, 03, 2}].
dst_dates() ->
[{1996, 06, 1},
{1997, 06, 2},
{1998, 06, 3},
{1999, 06, 4}].
%% exakt utc {date(), time()} which corresponds to the same seconds since 1 jan 1970
%% negative seconds are ok
%% generated with date --date='1979-05-28 12:30:35 UTC' +%s
ok_utc_seconds() -> [
{ {{1970, 1, 1},{ 0, 0, 0}}, 0 },
{ {{1970, 1, 1},{ 0, 0, 1}}, 1 },
{ {{1969,12,31},{23,59,59}}, -1 },
{ {{1920,12,31},{23,59,59}}, -1546300801 },
{ {{1600,02,19},{15,14,08}}, -11671807552 },
{ {{1979,05,28},{12,30,35}}, 296742635 },
{ {{1999,12,31},{23,59,59}}, 946684799 },
{ {{2000, 1, 1},{ 0, 0, 0}}, 946684800 },
{ {{2000, 1, 1},{ 0, 0, 1}}, 946684801 },
{ {{2038, 1,19},{03,14,07}}, 2147483647 }, % Sint32 full - 1
{ {{2038, 1,19},{03,14,08}}, 2147483648 }, % Sint32 full
{ {{2038, 1,19},{03,14,09}}, 2147483649 }, % Sint32 full + 1
{ {{2106, 2, 7},{ 6,28,14}}, 4294967294 }, % Uint32 full 0xFFFFFFFF - 1
{ {{2106, 2, 7},{ 6,28,15}}, 4294967295 }, % Uint32 full 0xFFFFFFFF
{ {{2106, 2, 7},{ 6,28,16}}, 4294967296 }, % Uint32 full 0xFFFFFFFF + 1
{ {{2012,12, 6},{16,28,08}}, 1354811288 },
{ {{2412,12, 6},{16,28,08}}, 13977592088 }
].
%% The following dates should not be near the end or beginning of
%% a month, because they will be used to test when the dates are
%% different in UTC and local time.
crossover_dates() ->
[{1996, 01, 25},
{1997, 01, 25},
{1998, 01, 25},
{1999, 01, 25},
{1996, 02, 27},
{1997, 02, 27},
{1998, 02, 27},
{1999, 02, 27}].
bad_dates() ->
[{{1900, 7, 1}, {12, 0, 0}}, % Year
{{1996, 0, 20}, {12, 0, 0}}, % Month
{{1996, 13, 20}, {12, 0, 0}},
{{1996, 1, 0}, {12, 0, 0}}, % Date
{{1996, 1, 32}, {12, 0, 0}},
{{1996, 2, 30}, {12, 0, 0}},
{{1997, 2, 29}, {12, 0, 0}},
{{1998, 2, 29}, {12, 0, 0}},
{{1999, 2, 29}, {12, 0, 0}},
{{1996, 4, 31}, {12, 0, 0}},
{{1996, 4, 30}, {-1, 0, 0}}, % Hour
{{1996, 4, 30}, {25, 0, 0}},
{{1996, 4, 30}, {12,-1, 0}}, % Minute
{{1996, 4, 30}, {12, 60, 0}},
{{1996, 4, 30}, {12, 0, -1}}, % Sec
{{1996, 4, 30}, {12, 0, 60}}].
start_node(Config) ->
start_node(Config, "").
start_node(Config, Args) ->
TestCase = ?config(testcase, Config),
PA = filename:dirname(code:which(?MODULE)),
ESTime = erlang:monotonic_time(1) + erlang:time_offset(1),
Unique = erlang:unique_integer([positive]),
Name = list_to_atom(atom_to_list(?MODULE)
++ "-"
++ atom_to_list(TestCase)
++ "-"
++ integer_to_list(ESTime)
++ "-"
++ integer_to_list(Unique)),
test_server:start_node(Name,
slave,
[{args, "-pa " ++ PA ++ " " ++ Args}]).
stop_node(Node) ->
test_server:stop_node(Node).
