File 2462-Implement-erlang-start_timer-opts.patch of Package erlang

Overview Repositories Revisions Requests Users Attributes Meta

File 2462-Implement-erlang-start_timer-opts.patch of Package erlang (Revision 66a224e208ffe9ee89602bad56a74dfa)

Currently displaying revision 66a224e208ffe9ee89602bad56a74dfa , Show latest

From bca4b5c87fd1aae2fdcb78b605181393a0caf9d9 Mon Sep 17 00:00:00 2001
From: Raimo Niskanen <raimo@erlang.org>
Date: Tue, 7 Feb 2017 22:38:36 +0100
Subject: [PATCH 2/4] Implement erlang:start_timer opts

---
 lib/stdlib/doc/src/gen_statem.xml    |  75 ++++++++++++++-----
 lib/stdlib/src/gen_statem.erl        | 139 ++++++++++++++++++++++++++---------
 lib/stdlib/test/gen_statem_SUITE.erl |   3 +-
 3 files changed, 162 insertions(+), 55 deletions(-)

diff --git a/lib/stdlib/doc/src/gen_statem.xml b/lib/stdlib/doc/src/gen_statem.xml
index f7baaad5d..44ac1ad8a 100644
--- a/lib/stdlib/doc/src/gen_statem.xml
+++ b/lib/stdlib/doc/src/gen_statem.xml
@@ -785,28 +785,38 @@ handle_event(_, _, State, Data) ->
 <name name="event_timeout"/>
 <desc>
 	
-	 Generates an event of
+	 Starts a timer set by
+	 <seealso marker="#type-enter_action"><c>enter_action()</c></seealso>
+	 <c>timeout</c>.
+	 When the timer expires an event of
 	 <seealso marker="#type-event_type"><c>event_type()</c></seealso>
-	 <c>timeout</c>
-	 after this time (in milliseconds) unless another
-	 event arrives or has arrived
-	 in which case this time-out is cancelled.
+	 <c>timeout</c> will be generated.
+	 See
+	 <seealso marker="erts:erlang#start_timer/4"><c>erlang:start_timer/4</c></seealso>
+	 for how <c>Time</c> and
+	 <seealso marker="#type-timeout_option"><c>Options</c></seealso>
+	 are interpreted. All <c>Options</c> of <c>erlang:start_timer/4</c>
+	 will not necessarily be supported in the future.
+	
+	
+	 Any event that arrives cancels this time-out.
 	 Note that a retried or inserted event counts as arrived.
 	 So does a state time-out zero event, if it was generated
-	 before this timer is requested.
+	 before this time-out is requested.
 	
 	
-	 If the value is <c>infinity</c>, no timer is started, as
-	 it never would trigger anyway.
+	 If <c>Time</c> is <c>infinity</c>,
+	 no timer is started, as it never would expire anyway.
 	
 	
-	 If the value is <c>0</c> no timer is actually started,
+	 If <c>Time</c> is relative and <c>0</c>
+	 no timer is actually started,
 	 instead the the time-out event is enqueued to ensure
 	 that it gets processed before any not yet
 	 received external event.
 	
 	
-	 Note that it is not possible or needed to cancel this time-out,
+	 Note that it is not possible nor needed to cancel this time-out,
 	 as it is cancelled automatically by any other event.
 	
 </desc>
@@ -815,19 +825,26 @@ handle_event(_, _, State, Data) ->
 <name name="state_timeout"/>
 <desc>
 	
-	 Generates an event of
+	 Starts a timer set by
+	 <seealso marker="#type-enter_action"><c>enter_action()</c></seealso>
+	 <c>state_timeout</c>.
+	 When the timer expires an event of
 	 <seealso marker="#type-event_type"><c>event_type()</c></seealso>
-	 <c>state_timeout</c>
-	 after this time (in milliseconds) unless the <c>gen_statem</c>
-	 changes states (<c>NewState =/= OldState</c>)
-	 which case this time-out is cancelled.
+	 <c>state_timeout</c> will be generated.
+	 See
+	 <seealso marker="erts:erlang#start_timer/4"><c>erlang:start_timer/4</c></seealso>
+	 for how <c>Time</c> and
+	 <seealso marker="#type-timeout_option"><c>Options</c></seealso>
+	 are interpreted. All <c>Options</c> of <c>erlang:start_timer/4</c>
+	 will not necessarily be supported in the future.
 	
 	
-	 If the value is <c>infinity</c>, no timer is started, as
-	 it never would trigger anyway.
+	 If <c>Time</c> is <c>infinity</c>,
+	 no timer is started, as it never would expire anyway.
 	
 	
-	 If the value is <c>0</c> no timer is actually started,
+	 If <c>Time</c> is relative and <c>0</c>
+	 no timer is actually started,
 	 instead the the time-out event is enqueued to ensure
 	 that it gets processed before any not yet
 	 received external event.
@@ -840,6 +857,20 @@ handle_event(_, _, State, Data) ->
 </desc>
 </datatype>
 <datatype>
+ <name name="timeout_option"/>
+ <desc>
+	
+	 If <c>Abs</c> is <c>true</c> an absolute timer is started,
+	 and if it <c>false</c> a relative, which is the default.
+	 See
+	 <seealso marker="erts:erlang#start_timer/4"><c>erlang:start_timer/4</c></seealso>
+	 for details.
+	
+	
+	
+ </desc>
+ </datatype>
+ <datatype>
 <name name="action"/>
 <desc>
 	
@@ -954,7 +985,9 @@ handle_event(_, _, State, Data) ->
 	 Sets the
 	 <seealso marker="#type-transition_option"><c>transition_option()</c></seealso>
 	 <seealso marker="#type-event_timeout"><c>event_timeout()</c></seealso>
-	 to <c><anno>Time</anno></c> with <c><anno>EventContent</anno></c>.
+	 to <c><anno>Time</anno></c> with <c><anno>EventContent</anno></c>
+	 and options
+	 <seealso marker="#type-timeout_option"><c><anno>Options</anno></c></seealso>.
 	 
 	 </item>
 	 <tag><c>state_timeout</c></tag>
@@ -963,7 +996,9 @@ handle_event(_, _, State, Data) ->
 	 Sets the
 	 <seealso marker="#type-transition_option"><c>transition_option()</c></seealso>
 	 <seealso marker="#type-state_timeout"><c>state_timeout()</c></seealso>
-	 to <c><anno>Time</anno></c> with <c><anno>EventContent</anno></c>.
+	 to <c><anno>Time</anno></c> with <c><anno>EventContent</anno></c>
+	 and options
+	 <seealso marker="#type-timeout_option"><c><anno>Options</anno></c></seealso>.
 	 
 	 </item>
 	</taglist>
diff --git a/lib/stdlib/src/gen_statem.erl b/lib/stdlib/src/gen_statem.erl
index 242ff87be..fe80bb5de 100644
--- a/lib/stdlib/src/gen_statem.erl
+++ b/lib/stdlib/src/gen_statem.erl
@@ -97,13 +97,14 @@
 	%% If 'true' hibernate the server instead of going into receive
 	boolean().
 -type event_timeout() ::
-	%% Generate a ('timeout', EventContent, ...) event after Time
+	%% Generate a ('timeout', EventContent, ...) event
 	%% unless some other event is delivered
-	Time :: timeout().
+	Time :: timeout() | integer().
 -type state_timeout() ::
-	%% Generate a ('state_timeout', EventContent, ...) event after Time
+	%% Generate a ('state_timeout', EventContent, ...) event
 	%% unless the state is changed
-	Time :: timeout().
+	Time :: timeout() | integer().
+-type timeout_option() :: {abs,Abs :: boolean()}.
 
 -type action() ::
 	%% During a state change:
@@ -137,8 +138,16 @@
 	(Timeout :: event_timeout()) | % {timeout,Timeout}
 	{'timeout', % Set the event_timeout option
 	 Time :: event_timeout(), EventContent :: term()} |
+	{'timeout', % Set the event_timeout option
+	 Time :: event_timeout(),
+	 EventContent :: term(),
+	 Options :: (timeout_option() | [timeout_option()])} |
 	{'state_timeout', % Set the state_timeout option
 	 Time :: state_timeout(), EventContent :: term()} |
+	{'state_timeout', % Set the state_timeout option
+	 Time :: state_timeout(),
+	 EventContent :: term(),
+	 Options :: (timeout_option() | [timeout_option()])} |
 	%%
 	reply_action().
 -type reply_action() ::
@@ -1312,7 +1321,7 @@ parse_enter_actions(Debug, S, State, Actions, Hibernate, TimeoutsR) ->
 
 parse_actions(Debug, S, State, Actions) ->
 Hibernate = false,
- TimeoutsR = [{timeout,infinity,infinity}], %% Will cancel event timer
+ TimeoutsR = [infinity], %% Will cancel event timer
 Postpone = false,
 NextEventsR = [],
 parse_actions(
@@ -1378,11 +1387,15 @@ parse_actions(
 		 ?STACKTRACE()}
 	 end;
 	%%
-	{state_timeout,_,_} = Timeout ->
+	{TimerType,_,_} = Timeout
+	 when TimerType =:= timeout;
+	 TimerType =:= state_timeout ->
 	 parse_actions_timeout(
 	 Debug, S, State, Actions,
 	 Hibernate, TimeoutsR, Postpone, NextEventsR, Timeout);
-	{timeout,_,_} = Timeout ->
+	{TimerType,_,_,_} = Timeout
+	 when TimerType =:= timeout;
+	 TimerType =:= state_timeout ->
 	 parse_actions_timeout(
 	 Debug, S, State, Actions,
 	 Hibernate, TimeoutsR, Postpone, NextEventsR, Timeout);
@@ -1395,26 +1408,64 @@ parse_actions(
 parse_actions_timeout(
 Debug, S, State, Actions,
 Hibernate, TimeoutsR, Postpone, NextEventsR, Timeout) ->
- Time =
-	case Timeout of
-	 {_,T,_} -> T;
-	 T -> T
-	end,
- case validate_time(Time) of
-	true ->
-	 parse_actions(
-	 Debug, S, State, Actions,
-	 Hibernate, [Timeout|TimeoutsR],
-	 Postpone, NextEventsR);
-	false ->
-	 {error,
-	 {bad_action_from_state_function,Timeout},
-	 ?STACKTRACE()}
+ case Timeout of
+	{TimerType,Time,TimerMsg,TimerOpts} ->
+	 case validate_timer_args(Time, listify(TimerOpts)) of
+		true ->
+		 parse_actions(
+		 Debug, S, State, Actions,
+		 Hibernate, [Timeout|TimeoutsR],
+		 Postpone, NextEventsR);
+		false ->
+		 NewTimeout = {TimerType,Time,TimerMsg},
+		 parse_actions(
+		 Debug, S, State, Actions,
+		 Hibernate, [NewTimeout|TimeoutsR],
+		 Postpone, NextEventsR);
+		error ->
+		 {error,
+		 {bad_action_from_state_function,Timeout},
+		 ?STACKTRACE()}
+	 end;
+	{_,Time,_} ->
+	 case validate_timer_args(Time, []) of
+		false ->
+		 parse_actions(
+		 Debug, S, State, Actions,
+		 Hibernate, [Timeout|TimeoutsR],
+		 Postpone, NextEventsR);
+		error ->
+		 {error,
+		 {bad_action_from_state_function,Timeout},
+		 ?STACKTRACE()}
+	 end;
+	Time ->
+	 case validate_timer_args(Time, []) of
+		false ->
+		 parse_actions(
+		 Debug, S, State, Actions,
+		 Hibernate, [Timeout|TimeoutsR],
+		 Postpone, NextEventsR);
+		error ->
+		 {error,
+		 {bad_action_from_state_function,Timeout},
+		 ?STACKTRACE()}
+	 end
 end.
 
-validate_time(Time) when is_integer(Time), Time >= 0 -> true;
-validate_time(infinity) -> true;
-validate_time(_) -> false.
+validate_timer_args(Time, Opts) ->
+ validate_timer_args(Time, Opts, false).
+%%
+validate_timer_args(Time, [], true) when is_integer(Time) ->
+ true;
+validate_timer_args(Time, [], false) when is_integer(Time), Time >= 0 ->
+ false;
+validate_timer_args(infinity, [], Abs) ->
+ Abs;
+validate_timer_args(Time, [{abs,Abs}|Opts], _) when is_boolean(Abs) ->
+ validate_timer_args(Time, Opts, Abs);
+validate_timer_args(_, [_|_], _) ->
+ error.
 
 %% Stop and start timers as well as create timeout zero events
 %% and pending event timer
@@ -1430,22 +1481,39 @@ parse_timers(
 TimerRefs, TimerTypes, CancelTimers, [Timeout|TimeoutsR],
 Seen, TimeoutEvents) ->
 case Timeout of
+	{TimerType,Time,TimerMsg,TimerOpts} ->
+	 %% Absolute timer
+	 parse_timers(
+	 TimerRefs, TimerTypes, CancelTimers, TimeoutsR,
+	 Seen, TimeoutEvents,
+	 TimerType, Time, TimerMsg, listify(TimerOpts));
+	%% Relative timers below
+	{TimerType,0,TimerMsg} ->
+	 parse_timers(
+	 TimerRefs, TimerTypes, CancelTimers, TimeoutsR,
+	 Seen, TimeoutEvents,
+	 TimerType, zero, TimerMsg, []);
 	{TimerType,Time,TimerMsg} ->
 	 parse_timers(
- TimerRefs, TimerTypes, CancelTimers, TimeoutsR,
- Seen, TimeoutEvents,
- TimerType, Time, TimerMsg);
+	 TimerRefs, TimerTypes, CancelTimers, TimeoutsR,
+	 Seen, TimeoutEvents,
+	 TimerType, Time, TimerMsg, []);
+	0 ->
+	 parse_timers(
+	 TimerRefs, TimerTypes, CancelTimers, TimeoutsR,
+	 Seen, TimeoutEvents,
+	 timeout, zero, 0, []);
 	Time ->
 	 parse_timers(
- TimerRefs, TimerTypes, CancelTimers, TimeoutsR,
- Seen, TimeoutEvents,
- timeout, Time, Time)
+	 TimerRefs, TimerTypes, CancelTimers, TimeoutsR,
+	 Seen, TimeoutEvents,
+	 timeout, Time, Time, [])
 end.
 
 parse_timers(
 TimerRefs, TimerTypes, CancelTimers, TimeoutsR,
 Seen, TimeoutEvents,
- TimerType, Time, TimerMsg) ->
+ TimerType, Time, TimerMsg, TimerOpts) ->
 case Seen of
 	#{TimerType := _} ->
 	 %% Type seen before - ignore
@@ -1464,7 +1532,7 @@ parse_timers(
 		 parse_timers(
 		 TimerRefs, NewTimerTypes, NewCancelTimers, TimeoutsR,
 		 NewSeen, TimeoutEvents);
-		0 ->
+		zero ->
 		 %% Cancel any running timer
 		 {NewTimerTypes,NewCancelTimers} =
 			cancel_timer_by_type(
@@ -1477,7 +1545,8 @@ parse_timers(
 		_ ->
 		 %% (Re)start the timer
 		 TimerRef =
-			erlang:start_timer(Time, self(), TimerMsg),
+			erlang:start_timer(
+			 Time, self(), TimerMsg, TimerOpts),
 		 case TimerTypes of
 			#{TimerType := OldTimerRef} ->
 			 %% Cancel the running timer
@@ -1491,6 +1560,8 @@ parse_timers(
 			 NewCancelTimers, TimeoutsR,
 			 NewSeen, TimeoutEvents);
 			#{} ->
+			 %% Insert the new timer into
+			 %% both TimerRefs and TimerTypes
 			 parse_timers(
 			 TimerRefs#{TimerRef => TimerType},
 			 TimerTypes#{TimerType => TimerRef},
diff --git a/lib/stdlib/test/gen_statem_SUITE.erl b/lib/stdlib/test/gen_statem_SUITE.erl
index ac27c9fc7..ee6109915 100644
--- a/lib/stdlib/test/gen_statem_SUITE.erl
+++ b/lib/stdlib/test/gen_statem_SUITE.erl
@@ -1597,8 +1597,9 @@ idle({call,From}, {delayed_answer,T}, Data) ->
 	 throw({keep_state,Data})
 end;
 idle({call,From}, {timeout,Time}, _Data) ->
+ AbsTime = erlang:monotonic_time(millisecond) + Time,
 {next_state,timeout,{From,Time},
- {timeout,Time,idle}};
+ {timeout,AbsTime,idle,[{abs,true}]}};
 idle(cast, next_event, _Data) ->
 {next_state,next_events,[a,b,c],
 [{next_event,internal,a},
-- 
2.12.2

Places

File 2462-Implement-erlang-start_timer-opts.patch of Package erlang (Revision 66a224e208ffe9ee89602bad56a74dfa)

Places