diff options
Diffstat (limited to 'lib/stdlib/doc/src/gen_statem.xml')
| -rw-r--r-- | lib/stdlib/doc/src/gen_statem.xml | 66 |
1 files changed, 40 insertions, 26 deletions
diff --git a/lib/stdlib/doc/src/gen_statem.xml b/lib/stdlib/doc/src/gen_statem.xml index fb1e4e8da2..567130875a 100644 --- a/lib/stdlib/doc/src/gen_statem.xml +++ b/lib/stdlib/doc/src/gen_statem.xml @@ -639,6 +639,20 @@ handle_event(_, _, State, Data) -> </p> <list type="ordered"> <item> + <p> + If the state changes or is the initial state, and + <seealso marker="#type-state_enter"><em>state enter calls</em></seealso> + are used, the <c>gen_statem</c> calls + the new state callback with arguments + <seealso marker="#type-state_enter">(enter, OldState, Data)</seealso>. + Any + <seealso marker="#type-enter_action"><c>actions</c></seealso> + returned from this call are handled as if they were + appended to the actions + returned by the state callback that changed states. + </p> + </item> + <item> <p> All <seealso marker="#type-action">actions</seealso> @@ -668,36 +682,36 @@ handle_event(_, _, State, Data) -> </p> </item> <item> - <p> - If the state changes or is the initial state, and - <seealso marker="#type-state_enter"><em>state enter calls</em></seealso> - are used, the <c>gen_statem</c> calls - the new state callback with arguments - <seealso marker="#type-state_enter">(enter, OldState, Data)</seealso>. - Any - <seealso marker="#type-enter_action"><c>actions</c></seealso> - returned from this call are handled as if they were - appended to the actions - returned by the state callback that changed states. - </p> - </item> - <item> - <p> - If there are enqueued events the (possibly new) - <seealso marker="#state callback">state callback</seealso> - is called with the oldest enqueued event, - and we start again from the top of this list. - </p> - </item> - <item> <p> Timeout timers <seealso marker="#type-state_timeout"><c>state_timeout()</c></seealso> and <seealso marker="#type-event_timeout"><c>event_timeout()</c></seealso> - are handled. This may lead to a time-out zero event - being generated to the + are handled. Time-outs with zero time are guaranteed to be + delivered to the state machine before any external + not yet received event so if there is such a timeout requested, + the corresponding time-out zero event is enqueued as + the newest event. + </p> + <p> + Any event cancels an + <seealso marker="#type-event_timeout"><c>event_timeout()</c></seealso> + so a zero time event time-out is only generated + if the event queue is empty. + </p> + <p> + A state change cancels a + <seealso marker="#type-state_timeout"><c>state_timeout()</c></seealso> + and any new transition option of this type + belongs to the new state. + </p> + </item> + <item> + <p> + If there are enqueued events the <seealso marker="#state callback">state callback</seealso> + for the possibly new state + is called with the oldest enqueued event, and we start again from the top of this list. </p> </item> @@ -802,7 +816,7 @@ handle_event(_, _, State, Data) -> <p> Setting this timer while it is running will restart it with the new time-out value. Therefore it is possible to cancel - this timeout by setting it to <c>infinity</c>. + this time-out by setting it to <c>infinity</c>. </p> </desc> </datatype> @@ -1130,7 +1144,7 @@ handle_event(_, _, State, Data) -> <c><anno>Timeout</anno></c> can also be a tuple <c>{clean_timeout,<anno>T</anno>}</c> or <c>{dirty_timeout,<anno>T</anno>}</c>, where - <c><anno>T</anno></c> is the timeout time. + <c><anno>T</anno></c> is the time-out time. <c>{clean_timeout,<anno>T</anno>}</c> works like just <c>T</c> described in the note above and uses a proxy process for <c>T < infinity</c>, |