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authorRaimo Niskanen <[email protected]>2017-02-06 16:06:08 +0100
committerRaimo Niskanen <[email protected]>2017-02-07 08:41:16 +0100
commit681b30df0caff7157c0c75aaeeaa8f38d194f2b2 (patch)
tree23874c177df61045ee10c0229d17de2fa189c3cb /lib/stdlib
parent67371bac3a00a04c226033ff423cc575b0aa2090 (diff)
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Clean up timer handling
Diffstat (limited to 'lib/stdlib')
-rw-r--r--lib/stdlib/src/gen_statem.erl112
1 files changed, 66 insertions, 46 deletions
diff --git a/lib/stdlib/src/gen_statem.erl b/lib/stdlib/src/gen_statem.erl
index 15c01c1006..6d9a828319 100644
--- a/lib/stdlib/src/gen_statem.erl
+++ b/lib/stdlib/src/gen_statem.erl
@@ -948,20 +948,38 @@ loop_receive(Parent, Debug, S) ->
end.
loop_receive_result(
- Parent, Debug, #{state := State} = S, Hibernate, Event) ->
+ Parent, Debug,
+ #{state := State,
+ timer_types := TimerTypes, cancel_timers := CancelTimers} = S,
+ Hibernate, Event) ->
%% From now the 'hibernate' field in S is invalid
%% and will be restored when looping back
%% in loop_event_result/11
NewDebug = sys_debug(Debug, S, State, {in,Event}),
%% Here is the queue of not yet handled events created
Events = [],
- loop_event(Parent, NewDebug, S, Events, Event, Hibernate).
+ %% Cancel any running event timer
+ case
+ cancel_timer_by_type(timeout, TimerTypes, CancelTimers)
+ of
+ {_,CancelTimers} ->
+ %% No timer cancelled
+ loop_event(Parent, NewDebug, S, Events, Event, Hibernate);
+ {NewTimerTypes,NewCancelTimers} ->
+ %% The timer is removed from NewTimerTypes but
+ %% remains in TimerRefs until we get
+ %% the cancel_timer msg
+ NewS =
+ S#{
+ timer_types := NewTimerTypes,
+ cancel_timers := NewCancelTimers},
+ loop_event(Parent, NewDebug, NewS, Events, Event, Hibernate)
+ end.
%% Entry point for handling an event, received or enqueued
loop_event(
Parent, Debug,
- #{state := State, data := Data, timer_types := TimerTypes,
- cancel_timers := CancelTimers} = S_0,
+ #{state := State, data := Data} = S,
Events, {Type,Content} = Event, Hibernate) ->
%%
%% If (this old) Hibernate is true here it can only be
@@ -972,34 +990,18 @@ loop_event(
%% would have happened if we actually hibernated
%% and immediately was awakened
Hibernate andalso garbage_collect(),
- case call_state_function(S_0, Type, Content, State, Data) of
- {ok,Result,S_1} ->
- %% Cancel event timeout
- S_2 =
- case
- cancel_timer_by_type(timeout, TimerTypes, CancelTimers)
- of
- {_,CancelTimers} ->
- %% No timer cancelled
- S_1;
- {NewTimerTypes,NewCancelTimers} ->
- %% The timer is removed from NewTimerTypes but
- %% remains in TimerRefs until we get
- %% the cancel_timer msg
- S_1#{
- timer_types := NewTimerTypes,
- cancel_timers := NewCancelTimers}
- end,
+ case call_state_function(S, Type, Content, State, Data) of
+ {ok,Result,NewS} ->
{NextState,NewData,Actions,EnterCall} =
parse_event_result(
- true, Debug, S_2,
+ true, Debug, NewS,
Events, Event, State, Data, Result),
loop_event_actions(
- Parent, Debug, S_2,
+ Parent, Debug, NewS,
Events, Event, NextState, NewData, Actions, EnterCall);
{Class,Reason,Stacktrace} ->
terminate(
- Class, Reason, Stacktrace, Debug, S_0,
+ Class, Reason, Stacktrace, Debug, S,
[Event|Events])
end.
@@ -1412,7 +1414,7 @@ parse_actions(
{bad_action_from_state_function,Action},
?STACKTRACE()};
{timeout,infinity,_} ->
- %% Ignore - timeout will never happen and already cancelled
+ %% Ignore - timeout will never happen and is already cancelled
parse_actions(
Debug, S, State, Actions,
Hibernate, TimeoutsR, Postpone, NextEventsR);
@@ -1467,7 +1469,6 @@ parse_actions(
?STACKTRACE()}
end.
-
%% Stop and start timers as well as create timeout zero events
%% and pending event timer
%%
@@ -1491,36 +1492,52 @@ parse_timers(
#{} ->
%% Unseen type - handle
NewSeen = Seen#{TimerType => true},
- %% Cancel any running timer
- {NewTimerTypes,NewCancelTimers} =
- cancel_timer_by_type(TimerType, TimerTypes, CancelTimers),
- %% This removes it from NewTimerTypes but its ref stays
- %% in TimerRefs until we get the cancel_timer msg
if
- Time =:= infinity ->
- %% Ignore - timer will never fire
- parse_timers(
- TimerRefs, NewTimerTypes, NewCancelTimers, TimeoutsR,
- NewSeen, TimeoutEvents);
TimerType =:= timeout ->
%% Handle event timer later
parse_timers(
- TimerRefs, NewTimerTypes, NewCancelTimers, TimeoutsR,
+ TimerRefs, TimerTypes, CancelTimers, TimeoutsR,
NewSeen, [Timeout|TimeoutEvents]);
+ Time =:= infinity ->
+ %% Cancel any running timer
+ {NewTimerTypes,NewCancelTimers} =
+ cancel_timer_by_type(
+ TimerType, TimerTypes, CancelTimers),
+ parse_timers(
+ TimerRefs, NewTimerTypes, NewCancelTimers, TimeoutsR,
+ NewSeen, TimeoutEvents);
Time =:= 0 ->
+ %% Cancel any running timer
+ {NewTimerTypes,NewCancelTimers} =
+ cancel_timer_by_type(
+ TimerType, TimerTypes, CancelTimers),
%% Handle zero time timeouts later
TimeoutEvent = {TimerType,TimerMsg},
parse_timers(
TimerRefs, NewTimerTypes, NewCancelTimers, TimeoutsR,
NewSeen, [TimeoutEvent|TimeoutEvents]);
true ->
- %% Start a new timer
- TimerRef = erlang:start_timer(Time, self(), TimerMsg),
- %% Insert it both into TimerRefs and TimerTypes
- parse_timers(
- TimerRefs#{TimerRef => TimerType},
- NewTimerTypes#{TimerType => TimerRef},
- NewCancelTimers, TimeoutsR, NewSeen, TimeoutEvents)
+ %% (Re)start the timer
+ TimerRef =
+ erlang:start_timer(Time, self(), TimerMsg),
+ case TimerTypes of
+ #{TimerType := OldTimerRef} ->
+ %% Cancel the running timer
+ cancel_timer(OldTimerRef),
+ %% Insert the new timer into
+ %% both TimerRefs and TimerTypes
+ parse_timers(
+ TimerRefs#{TimerRef => TimerType},
+ TimerTypes#{TimerType => TimerRef},
+ CancelTimers + 1,
+ TimeoutsR, NewSeen, TimeoutEvents);
+ #{} ->
+ parse_timers(
+ TimerRefs#{TimerRef => TimerType},
+ TimerTypes#{TimerType => TimerRef},
+ CancelTimers,
+ TimeoutsR, NewSeen, TimeoutEvents)
+ end
end
end.
@@ -1762,8 +1779,11 @@ listify(Item) ->
cancel_timer_by_type(TimerType, TimerTypes, CancelTimers) ->
case TimerTypes of
#{TimerType := TimerRef} ->
- _ = erlang:cancel_timer(TimerRef, [{async,true}]),
+ cancel_timer(TimerRef),
{maps:remove(TimerType, TimerTypes),CancelTimers + 1};
#{} ->
{TimerTypes,CancelTimers}
end.
+
+cancel_timer(TimerRef) ->
+ ok = erlang:cancel_timer(TimerRef, [{async,true}]).