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-rw-r--r--erts/emulator/test/system_profile_SUITE.erl155
-rw-r--r--erts/emulator/test/trace_bif_SUITE.erl249
2 files changed, 288 insertions, 116 deletions
diff --git a/erts/emulator/test/system_profile_SUITE.erl b/erts/emulator/test/system_profile_SUITE.erl
index e4b6511d1f..2ecb4a28a7 100644
--- a/erts/emulator/test/system_profile_SUITE.erl
+++ b/erts/emulator/test/system_profile_SUITE.erl
@@ -113,13 +113,27 @@ runnable_procs(suite) ->
runnable_procs(doc) ->
["Tests system_profiling with runnable_procs."];
runnable_procs(Config) when is_list(Config) ->
+ lists:foreach(fun (TsType) ->
+ Arg = case TsType of
+ no_timestamp ->
+ {timestamp, []};
+ _ ->
+ {TsType, [TsType]}
+ end,
+ do_runnable_procs(Arg),
+ receive after 1000 -> ok end
+ end,
+ [no_timestamp, timestamp, monotonic_timestamp,
+ strict_monotonic_timestamp]).
+
+do_runnable_procs({TsType, TsTypeFlag}) ->
Pid = start_profiler_process(),
% start a ring of processes
% FIXME: Set #laps and #nodes in config file
Nodes = 10,
Laps = 10,
Master = ring(Nodes),
- undefined = erlang:system_profile(Pid, [runnable_procs]),
+ undefined = erlang:system_profile(Pid, [runnable_procs]++TsTypeFlag),
% loop a message
ok = ring_message(Master, message, Laps),
Events = get_profiler_events(),
@@ -127,9 +141,9 @@ runnable_procs(Config) when is_list(Config) ->
erlang:system_profile(undefined, []),
put(master, Master),
put(laps, Laps),
- true = has_runnable_event(Events),
+ true = has_runnable_event(TsType, Events),
Pids = sort_events_by_pid(Events),
- ok = check_events(Pids),
+ ok = check_events(TsType, Pids),
erase(),
exit(Pid,kill),
ok.
@@ -139,8 +153,22 @@ runnable_ports(suite) ->
runnable_ports(doc) ->
["Tests system_profiling with runnable_port."];
runnable_ports(Config) when is_list(Config) ->
+ lists:foreach(fun (TsType) ->
+ Arg = case TsType of
+ no_timestamp ->
+ {timestamp, []};
+ _ ->
+ {TsType, [TsType]}
+ end,
+ do_runnable_ports(Arg, Config),
+ receive after 1000 -> ok end
+ end,
+ [no_timestamp, timestamp, monotonic_timestamp,
+ strict_monotonic_timestamp]).
+
+do_runnable_ports({TsType, TsTypeFlag}, Config) ->
Pid = start_profiler_process(),
- undefined = erlang:system_profile(Pid, [runnable_ports]),
+ undefined = erlang:system_profile(Pid, [runnable_ports]++TsTypeFlag),
EchoPid = echo(Config),
% FIXME: Set config to number_of_echos
Laps = 10,
@@ -149,9 +177,9 @@ runnable_ports(Config) when is_list(Config) ->
Events = get_profiler_events(),
kill_em_all = kill_echo(EchoPid),
erlang:system_profile(undefined, []),
- true = has_runnable_event(Events),
+ true = has_runnable_event(TsType, Events),
Pids = sort_events_by_pid(Events),
- ok = check_events(Pids),
+ ok = check_events(TsType, Pids),
erase(),
exit(Pid,kill),
ok.
@@ -166,8 +194,19 @@ scheduler(Config) when is_list(Config) ->
{_, 1} -> {skipped, "No need for scheduler test when only one scheduler online."};
_ ->
Nodes = 10,
- ok = check_block_system(Nodes),
- ok = check_multi_scheduling_block(Nodes)
+ lists:foreach(fun (TsType) ->
+ Arg = case TsType of
+ no_timestamp ->
+ {timestamp, []};
+ _ ->
+ {TsType, [TsType]}
+ end,
+ ok = check_block_system(Arg, Nodes),
+ ok = check_multi_scheduling_block(Arg, Nodes),
+ receive after 1000 -> ok end
+ end,
+ [no_timestamp, timestamp, monotonic_timestamp,
+ strict_monotonic_timestamp])
end.
% the profiler pid should not be profiled
@@ -195,9 +234,9 @@ dont_profile_profiler(Config) when is_list(Config) ->
%%% Check scheduler profiling
-check_multi_scheduling_block(Nodes) ->
+check_multi_scheduling_block({TsType, TsTypeFlag}, Nodes) ->
Pid = start_profiler_process(),
- undefined = erlang:system_profile(Pid, [scheduler]),
+ undefined = erlang:system_profile(Pid, [scheduler]++TsTypeFlag),
{ok, Supervisor} = start_load(Nodes),
wait(600),
erlang:system_flag(multi_scheduling, block),
@@ -205,23 +244,23 @@ check_multi_scheduling_block(Nodes) ->
erlang:system_flag(multi_scheduling, unblock),
{Pid, [scheduler]} = erlang:system_profile(undefined, []),
Events = get_profiler_events(),
- true = has_scheduler_event(Events),
+ true = has_scheduler_event(TsType, Events),
stop_load(Supervisor),
exit(Pid,kill),
erase(),
ok.
-check_block_system(Nodes) ->
+check_block_system({TsType, TsTypeFlag}, Nodes) ->
Dummy = spawn(?MODULE, profiler_process, [[]]),
Pid = start_profiler_process(),
- undefined = erlang:system_profile(Pid, [scheduler]),
+ undefined = erlang:system_profile(Pid, [scheduler]++TsTypeFlag),
{ok, Supervisor} = start_load(Nodes),
wait(300),
undefined = erlang:system_monitor(Dummy, [busy_port]),
{Dummy, [busy_port]} = erlang:system_monitor(undefined, []),
{Pid, [scheduler]} = erlang:system_profile(undefined, []),
Events = get_profiler_events(),
- true = has_scheduler_event(Events),
+ true = has_scheduler_event(TsType, Events),
stop_load(Supervisor),
exit(Pid,kill),
exit(Dummy,kill),
@@ -230,40 +269,49 @@ check_block_system(Nodes) ->
%%% Check events
-check_events([]) -> ok;
-check_events([Pid | Pids]) ->
+check_events(_TsType, []) -> ok;
+check_events(TsType, [Pid | Pids]) ->
Master = get(master),
Laps = get(laps),
CheckPids = get(pids),
{Events, N} = get_pid_events(Pid),
ok = check_event_flow(Events),
- ok = check_event_ts(Events),
+ ok = check_event_ts(TsType, Events),
IsMember = lists:member(Pid, CheckPids),
case Pid of
Master ->
io:format("Expected ~p and got ~p profile events from ~p: ok~n", [Laps*2+2, N, Pid]),
N = Laps*2 + 2,
- check_events(Pids);
+ check_events(TsType, Pids);
Pid when IsMember == true ->
io:format("Expected ~p and got ~p profile events from ~p: ok~n", [Laps*2, N, Pid]),
N = Laps*2,
- check_events(Pids);
+ check_events(TsType, Pids);
Pid ->
- check_events(Pids)
+ check_events(TsType, Pids)
end.
%% timestamp consistency check for descending timestamps
-check_event_ts(Events) ->
- check_event_ts(Events, undefined).
-check_event_ts([], _) -> ok;
-check_event_ts([Event | Events], undefined) ->
- check_event_ts(Events, Event);
-check_event_ts([{Pid, _, _, TS1}=Event | Events], {Pid,_,_,TS0}) ->
- Time = timer:now_diff(TS1, TS0),
+check_event_ts(TsType, Events) ->
+ check_event_ts(TsType, Events, undefined).
+check_event_ts(_TsType, [], _) -> ok;
+check_event_ts(TsType, [Event | Events], undefined) ->
+ check_event_ts(TsType, Events, Event);
+check_event_ts(TsType, [{Pid, _, _, TS1}=Event | Events], {Pid,_,_,TS0}) ->
+ Time = case TsType of
+ timestamp ->
+ timer:now_diff(TS1, TS0);
+ monotonic_timestamp ->
+ TS1 - TS0;
+ strict_monotonic_timestamp ->
+ {MT1, _} = TS1,
+ {MT0, _} = TS0,
+ MT1 - MT0
+ end,
if
Time < 0.0 -> timestamp_error;
- true -> check_event_ts(Events, Event)
+ true -> check_event_ts(TsType, Events, Event)
end.
%% consistency check for active vs. inactive activity (runnable)
@@ -428,6 +476,44 @@ port_echo_loop(Port) ->
%% Helpers
%%%
+check_ts(no_timestamp, Ts) ->
+ try
+ no_timestamp = Ts
+ catch
+ _ : _ ->
+ ?t:fail({unexpected_timestamp, Ts})
+ end,
+ ok;
+check_ts(timestamp, Ts) ->
+ try
+ {Ms,S,Us} = Ts,
+ true = is_integer(Ms),
+ true = is_integer(S),
+ true = is_integer(Us)
+ catch
+ _ : _ ->
+ ?t:fail({unexpected_timestamp, Ts})
+ end,
+ ok;
+check_ts(monotonic_timestamp, Ts) ->
+ try
+ true = is_integer(Ts)
+ catch
+ _ : _ ->
+ ?t:fail({unexpected_timestamp, Ts})
+ end,
+ ok;
+check_ts(strict_monotonic_timestamp, Ts) ->
+ try
+ {MT, UMI} = Ts,
+ true = is_integer(MT),
+ true = is_integer(UMI)
+ catch
+ _ : _ ->
+ ?t:fail({unexpected_timestamp, Ts})
+ end,
+ ok.
+
start_load(N) ->
Pid = spawn_link(?MODULE, run_load, [N, []]),
{ok, Pid}.
@@ -454,21 +540,24 @@ list_load() ->
end,
list_load().
-
-has_scheduler_event(Events) ->
+has_scheduler_event(TsType, Events) ->
lists:any(
fun (Pred) ->
case Pred of
- {profile, scheduler, _ID, _Activity, _NR, _TS} -> true;
+ {profile, scheduler, _ID, _Activity, _NR, TS} ->
+ check_ts(TsType, TS),
+ true;
_ -> false
end
end, Events).
-has_runnable_event(Events) ->
+has_runnable_event(TsType, Events) ->
lists:any(
fun (Pred) ->
case Pred of
- {profile, _Pid, _Activity, _MFA, _TS} -> true;
+ {profile, _Pid, _Activity, _MFA, TS} ->
+ check_ts(TsType, TS),
+ true;
_ -> false
end
end, Events).
diff --git a/erts/emulator/test/trace_bif_SUITE.erl b/erts/emulator/test/trace_bif_SUITE.erl
index a12c41a3aa..760666d077 100644
--- a/erts/emulator/test/trace_bif_SUITE.erl
+++ b/erts/emulator/test/trace_bif_SUITE.erl
@@ -67,7 +67,8 @@ trace_on_and_off(Config) when is_list(Config) ->
?line Pid = spawn(?MODULE, bif_process, []),
?line Self = self(),
?line 1 = erlang:trace(Pid, true, [call,timestamp]),
- ?line {flags,[timestamp,call]} = erlang:trace_info(Pid,flags),
+ ?line {flags, Flags} = erlang:trace_info(Pid,flags),
+ ?line [call,timestamp] = lists:sort(Flags),
?line {tracer, Self} = erlang:trace_info(Pid,tracer),
?line 1 = erlang:trace(Pid, false, [timestamp]),
?line {flags,[call]} = erlang:trace_info(Pid,flags),
@@ -111,93 +112,145 @@ do_trace_bif(Flags) ->
trace_bif_timestamp(doc) -> "Test tracing BIFs with timestamps.";
trace_bif_timestamp(Config) when is_list(Config) ->
- do_trace_bif_timestamp([]).
-
+ do_trace_bif_timestamp([], timestamp, [timestamp]),
+ do_trace_bif_timestamp([], timestamp,
+ [timestamp,
+ monotonic_timestamp,
+ strict_monotonic_timestamp]),
+ do_trace_bif_timestamp([], strict_monotonic_timestamp,
+ [strict_monotonic_timestamp]),
+ do_trace_bif_timestamp([], strict_monotonic_timestamp,
+ [monotonic_timestamp, strict_monotonic_timestamp]),
+ do_trace_bif_timestamp([], monotonic_timestamp, [monotonic_timestamp]).
+
trace_bif_timestamp_local(doc) ->
"Test tracing BIFs with timestamps and local flag.";
trace_bif_timestamp_local(Config) when is_list(Config) ->
- do_trace_bif_timestamp([local]).
-
-do_trace_bif_timestamp(Flags) ->
- ?line Pid=spawn(?MODULE, bif_process, []),
- ?line 1 = erlang:trace(Pid, true, [call,timestamp]),
- ?line erlang:trace_pattern({erlang,'_','_'}, [], Flags),
-
- ?line Pid ! {do_bif, time, []},
- ?line receive_trace_msg_ts({trace_ts,Pid,call,{erlang,time,[]}}),
-
- ?line Pid ! {do_bif, statistics, [runtime]},
- ?line receive_trace_msg_ts({trace_ts,Pid,call,
- {erlang,statistics, [runtime]}}),
-
- ?line Pid ! {do_time_bif},
- ?line receive_trace_msg_ts({trace_ts,Pid,call,
- {erlang,time, []}}),
-
- ?line Pid ! {do_statistics_bif},
- ?line receive_trace_msg_ts({trace_ts,Pid,call,
- {erlang,statistics, [runtime]}}),
+ do_trace_bif_timestamp([local], timestamp, [timestamp]),
+ do_trace_bif_timestamp([local], timestamp,
+ [timestamp,
+ monotonic_timestamp,
+ strict_monotonic_timestamp]),
+ do_trace_bif_timestamp([local], strict_monotonic_timestamp,
+ [strict_monotonic_timestamp]),
+ do_trace_bif_timestamp([local], strict_monotonic_timestamp,
+ [monotonic_timestamp, strict_monotonic_timestamp]),
+ do_trace_bif_timestamp([local], monotonic_timestamp, [monotonic_timestamp]).
+
+do_trace_bif_timestamp(Flags, TsType, TsFlags) ->
+ io:format("Testing with TsType=~p TsFlags=~p~n", [TsType, TsFlags]),
+ Pid=spawn(?MODULE, bif_process, []),
+ 1 = erlang:trace(Pid, true, [call]++TsFlags),
+ erlang:trace_pattern({erlang,'_','_'}, [], Flags),
+
+ Ts0 = make_ts(TsType),
+ Pid ! {do_bif, time, []},
+ Ts1 = receive_trace_msg_ts({trace_ts,Pid,call,{erlang,time,[]}},
+ Ts0,TsType),
+
+ Pid ! {do_bif, statistics, [runtime]},
+ Ts2 = receive_trace_msg_ts({trace_ts,Pid,call,
+ {erlang,statistics, [runtime]}},
+ Ts1, TsType),
+
+ Pid ! {do_time_bif},
+ Ts3 = receive_trace_msg_ts({trace_ts,Pid,call,
+ {erlang,time, []}},
+ Ts2, TsType),
+
+ Pid ! {do_statistics_bif},
+ Ts4 = receive_trace_msg_ts({trace_ts,Pid,call,
+ {erlang,statistics, [runtime]}},
+ Ts3, TsType),
+
+ check_ts(TsType, Ts4, make_ts(TsType)),
%% We should be able to turn off the timestamp.
- ?line 1 = erlang:trace(Pid, false, [timestamp]),
+ 1 = erlang:trace(Pid, false, TsFlags),
- ?line Pid ! {do_statistics_bif},
- ?line receive_trace_msg({trace,Pid,call,
- {erlang,statistics, [runtime]}}),
+ Pid ! {do_statistics_bif},
+ receive_trace_msg({trace,Pid,call,
+ {erlang,statistics, [runtime]}}),
- ?line Pid ! {do_bif, statistics, [runtime]},
- ?line receive_trace_msg({trace,Pid,call,
- {erlang,statistics, [runtime]}}),
+ Pid ! {do_bif, statistics, [runtime]},
+ receive_trace_msg({trace,Pid,call,
+ {erlang,statistics, [runtime]}}),
- ?line 1 = erlang:trace(Pid, false, [call]),
- ?line erlang:trace_pattern({erlang,'_','_'}, false, Flags),
+ 1 = erlang:trace(Pid, false, [call]),
+ erlang:trace_pattern({erlang,'_','_'}, false, Flags),
- ?line exit(Pid, die),
+ exit(Pid, die),
ok.
trace_bif_return(doc) ->
"Test tracing BIF's with return/return_to trace.";
trace_bif_return(Config) when is_list(Config) ->
- ?line Pid=spawn(?MODULE, bif_process, []),
- ?line 1 = erlang:trace(Pid, true, [call,timestamp,return_to]),
- ?line erlang:trace_pattern({erlang,'_','_'}, [{'_',[],[{return_trace}]}],
- [local]),
-
-
- ?line Pid ! {do_bif, time, []},
- ?line receive_trace_msg_ts({trace_ts,Pid,call,{erlang,time,[]}}),
- ?line receive_trace_msg_ts_return_from({trace_ts,Pid,return_from,
- {erlang,time,0}}),
- ?line receive_trace_msg_ts_return_to({trace_ts,Pid,return_to,
- {?MODULE, bif_process,0}}),
-
-
- ?line Pid ! {do_bif, statistics, [runtime]},
- ?line receive_trace_msg_ts({trace_ts,Pid,call,
- {erlang,statistics, [runtime]}}),
- ?line receive_trace_msg_ts_return_from({trace_ts,Pid,return_from,
- {erlang,statistics,1}}),
- ?line receive_trace_msg_ts_return_to({trace_ts,Pid,return_to,
- {?MODULE, bif_process,0}}),
-
-
- ?line Pid ! {do_time_bif},
- ?line receive_trace_msg_ts({trace_ts,Pid,call,
- {erlang,time, []}}),
- ?line receive_trace_msg_ts_return_from({trace_ts,Pid,return_from,
- {erlang,time,0}}),
- ?line receive_trace_msg_ts_return_to({trace_ts,Pid,return_to,
- {?MODULE, bif_process,0}}),
-
-
-
- ?line Pid ! {do_statistics_bif},
- ?line receive_trace_msg_ts({trace_ts,Pid,call,
- {erlang,statistics, [runtime]}}),
- ?line receive_trace_msg_ts_return_from({trace_ts,Pid,return_from,
- {erlang,statistics,1}}),
- ?line receive_trace_msg_ts_return_to({trace_ts,Pid,return_to,
- {?MODULE, bif_process,0}}),
+ do_trace_bif_return(timestamp, [timestamp]),
+ do_trace_bif_return(timestamp,
+ [timestamp,
+ monotonic_timestamp,
+ strict_monotonic_timestamp]),
+ do_trace_bif_return(strict_monotonic_timestamp,
+ [strict_monotonic_timestamp]),
+ do_trace_bif_return(strict_monotonic_timestamp,
+ [monotonic_timestamp, strict_monotonic_timestamp]),
+ do_trace_bif_return(monotonic_timestamp, [monotonic_timestamp]).
+
+do_trace_bif_return(TsType, TsFlags) ->
+ io:format("Testing with TsType=~p TsFlags=~p~n", [TsType, TsFlags]),
+ Pid=spawn(?MODULE, bif_process, []),
+ 1 = erlang:trace(Pid, true, [call,return_to]++TsFlags),
+ erlang:trace_pattern({erlang,'_','_'}, [{'_',[],[{return_trace}]}],
+ [local]),
+
+ Ts0 = make_ts(TsType),
+ Pid ! {do_bif, time, []},
+ Ts1 = receive_trace_msg_ts({trace_ts,Pid,call,{erlang,time,[]}},
+ Ts0, TsType),
+ Ts2 = receive_trace_msg_ts_return_from({trace_ts,Pid,return_from,
+ {erlang,time,0}},
+ Ts1, TsType),
+ Ts3 = receive_trace_msg_ts_return_to({trace_ts,Pid,return_to,
+ {?MODULE, bif_process,0}},
+ Ts2, TsType),
+
+
+ Pid ! {do_bif, statistics, [runtime]},
+ Ts4 = receive_trace_msg_ts({trace_ts,Pid,call,
+ {erlang,statistics, [runtime]}},
+ Ts3, TsType),
+ Ts5 = receive_trace_msg_ts_return_from({trace_ts,Pid,return_from,
+ {erlang,statistics,1}},
+ Ts4, TsType),
+ Ts6 = receive_trace_msg_ts_return_to({trace_ts,Pid,return_to,
+ {?MODULE, bif_process,0}},
+ Ts5, TsType),
+
+
+ Pid ! {do_time_bif},
+ Ts7 = receive_trace_msg_ts({trace_ts,Pid,call,
+ {erlang,time, []}},
+ Ts6, TsType),
+ Ts8 = receive_trace_msg_ts_return_from({trace_ts,Pid,return_from,
+ {erlang,time,0}},
+ Ts7, TsType),
+ Ts9 = receive_trace_msg_ts_return_to({trace_ts,Pid,return_to,
+ {?MODULE, bif_process,0}},
+ Ts8, TsType),
+
+
+
+ Pid ! {do_statistics_bif},
+ Ts10 = receive_trace_msg_ts({trace_ts,Pid,call,
+ {erlang,statistics, [runtime]}},
+ Ts9, TsType),
+ Ts11 = receive_trace_msg_ts_return_from({trace_ts,Pid,return_from,
+ {erlang,statistics,1}},
+ Ts10, TsType),
+ Ts12 = receive_trace_msg_ts_return_to({trace_ts,Pid,return_to,
+ {?MODULE, bif_process,0}},
+ Ts11, TsType),
+ check_ts(TsType, Ts12, make_ts(TsType)),
ok.
@@ -213,10 +266,11 @@ receive_trace_msg(Mess) ->
?t:fail()
end.
-receive_trace_msg_ts({trace_ts, Pid, call, {erlang,F,A}}) ->
+receive_trace_msg_ts({trace_ts, Pid, call, {erlang,F,A}}, PrevTs, TsType) ->
receive
- {trace_ts, Pid, call, {erlang, F, A}, _Ts} ->
- ok;
+ {trace_ts, Pid, call, {erlang, F, A}, Ts} ->
+ check_ts(TsType, PrevTs, Ts),
+ Ts;
Other ->
io:format("Expected: {trace, ~p, call, {~p, ~p, ~p}, TimeStamp}},~n"
"Got: ~p~n",
@@ -227,10 +281,11 @@ receive_trace_msg_ts({trace_ts, Pid, call, {erlang,F,A}}) ->
?t:fail()
end.
-receive_trace_msg_ts_return_from({trace_ts, Pid, return_from, {erlang,F,A}}) ->
+receive_trace_msg_ts_return_from({trace_ts, Pid, return_from, {erlang,F,A}}, PrevTs, TsType) ->
receive
- {trace_ts, Pid, return_from, {erlang, F, A}, _Value, _Ts} ->
- ok;
+ {trace_ts, Pid, return_from, {erlang, F, A}, _Value, Ts} ->
+ check_ts(TsType, PrevTs, Ts),
+ Ts;
Other ->
io:format("Expected: {trace_ts, ~p, return_from, {~p, ~p, ~p}, Value, TimeStamp}},~n"
"Got: ~p~n",
@@ -241,10 +296,11 @@ receive_trace_msg_ts_return_from({trace_ts, Pid, return_from, {erlang,F,A}}) ->
?t:fail()
end.
-receive_trace_msg_ts_return_to({trace_ts, Pid, return_to, {M,F,A}}) ->
+receive_trace_msg_ts_return_to({trace_ts, Pid, return_to, {M,F,A}}, PrevTs, TsType) ->
receive
- {trace_ts, Pid, return_to, {M, F, A}, _Ts} ->
- ok;
+ {trace_ts, Pid, return_to, {M, F, A}, Ts} ->
+ check_ts(TsType, PrevTs, Ts),
+ Ts;
Other ->
io:format("Expected: {trace_ts, ~p, return_to, {~p, ~p, ~p}, TimeStamp}},~n"
"Got: ~p~n",
@@ -255,6 +311,33 @@ receive_trace_msg_ts_return_to({trace_ts, Pid, return_to, {M,F,A}}) ->
?t:fail()
end.
+make_ts(timestamp) ->
+ erlang:now();
+make_ts(monotonic_timestamp) ->
+ erlang:monotonic_time();
+make_ts(strict_monotonic_timestamp) ->
+ MT = erlang:monotonic_time(),
+ UMI = erlang:unique_integer([monotonic]),
+ {MT, UMI}.
+
+check_ts(timestamp, PrevTs, Ts) ->
+ {Ms, S, Us} = Ts,
+ true = is_integer(Ms),
+ true = is_integer(S),
+ true = is_integer(Us),
+ true = PrevTs < Ts,
+ Ts;
+check_ts(monotonic_timestamp, PrevTs, Ts) ->
+ true = is_integer(Ts),
+ true = PrevTs =< Ts,
+ Ts;
+check_ts(strict_monotonic_timestamp, PrevTs, Ts) ->
+ {MT, UMI} = Ts,
+ true = is_integer(MT),
+ true = is_integer(UMI),
+ true = PrevTs < Ts,
+ Ts.
+
bif_process() ->
receive
{do_bif, Name, Args} ->