Merge branch 'rickard/time-improvement/OTP-11997'

* rickard/time-improvement/OTP-11997:
  Allow execution of estone suite on pre OTP-18 systems
  Add parallel time monotonicity test-case
  Replace usage of erlang:now() in line-tracing
  Replace erlang:now() usage in emulator suite
  Replace erlang:now() usage in system suite
  Misc time improvements

1 files changed, 8 insertions, 12 deletions

diff --git a/erts/emulator/test/process_SUITE.erl b/erts/emulator/test/process_SUITE.erl
index bf31655066..105d39f126 100644
--- a/erts/emulator/test/process_SUITE.erl
+++ b/erts/emulator/test/process_SUITE.erl
@@ -379,16 +379,15 @@ eat_high(Low) ->
     process_flag(priority, high),
     receive after 1000 -> ok end,
     exit(Low, {you, are, dead}),
-    {_, Sec, _} = now(),
-    loop(Sec, Sec).
+    loop(erlang:monotonic_time() + erlang:convert_time_unit(5,seconds,native)).
 
 %% Busy loop for 5 seconds.
 
-loop(OrigSec, CurrentSec) when CurrentSec < OrigSec+5 ->
-    {_, NewSec, _} = now(),
-    loop(OrigSec, NewSec);
-loop(_, _) ->
-    ok.
+loop(StopTime) ->
+    case StopTime >= erlang:monotonic_time() of
+	true -> ok;
+	false -> loop(StopTime)
+    end.
 
 
 %% Tries to send two different exit messages to a process.
@@ -2450,16 +2449,13 @@ start_node(Config) ->
 
 start_node(Config, Args) when is_list(Config) ->
     Pa = filename:dirname(code:which(?MODULE)),
-    {A, B, C} = now(),
     Name = list_to_atom(atom_to_list(?MODULE)
 			      ++ "-"
 			      ++ atom_to_list(?config(testcase, Config))
 			      ++ "-"
-			      ++ integer_to_list(A)
-			      ++ "-"
-			      ++ integer_to_list(B)
+			      ++ integer_to_list(erlang:system_time(seconds))
 			      ++ "-"
-			      ++ integer_to_list(C)),
+			      ++ integer_to_list(erlang:unique_integer([positive]))),
     ?t:start_node(Name, slave, [{args, "-pa "++Pa++" "++Args}]).
 
 stop_node(Node) ->