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| author | Gabor Liptak <gliptak@users.sourceforge.net> | 2011-01-29 15:52:39 -0500 |
|---|---|---|
| committer | Niclas Axelsson <burbas@erlang.org> | 2011-02-25 17:05:43 +0100 |
| commit | 1fb616dac50969cef3f260ec9d899f2f980fca1d (patch) | |
| tree | fbe3bb282acefccf736eede6e7219e2c4b3cde83 /system | |
| parent | 059606a330e8e86305699f60de144102560cb57b (diff) | |
| download | erlang-1fb616dac50969cef3f260ec9d899f2f980fca1d.tar.gz | |
Update Handling Other Messages section in gen_server, gen_fsm, gen_events overviews
Diffstat (limited to 'system')
| -rw-r--r-- | system/doc/design_principles/events.xml | 17 | ||||
| -rw-r--r-- | system/doc/design_principles/fsm.xml | 5 | ||||
| -rw-r--r-- | system/doc/design_principles/gen_server_concepts.xml | 5 |
3 files changed, 27 insertions, 0 deletions
diff --git a/system/doc/design_principles/events.xml b/system/doc/design_principles/events.xml index 5579f1e459..fab9e8305e 100644 --- a/system/doc/design_principles/events.xml +++ b/system/doc/design_principles/events.xml @@ -217,5 +217,22 @@ terminate(_Args, Fd) -> ok</pre> </section> </section> + <section> + <title>Handling Other Messages</title> + <p>If the gen_event should be able to receive other messages than + events, the callback function <c>handle_info(Info, StateName, StateData)</c> + must be implemented to handle them. Examples of + other messages are exit messages, if the gen_event is linked to + other processes (than the supervisor) and trapping exit signals.</p> + <code type="none"> +handle_info({'EXIT', Pid, Reason}, State) -> + ..code to handle exits here.. + {ok, NewState}.</code> + <p>The code_change method also has to be implemented.</p> + <code type="none"> +code_change(OldVsn, State, Extra) -> + ..code to convert state (and more) during code change + {ok, NewState}</code> + </section> </chapter> diff --git a/system/doc/design_principles/fsm.xml b/system/doc/design_principles/fsm.xml index 7cdd62057b..c3e9027274 100644 --- a/system/doc/design_principles/fsm.xml +++ b/system/doc/design_principles/fsm.xml @@ -308,6 +308,11 @@ terminate(normal, _StateName, _StateData) -> handle_info({'EXIT', Pid, Reason}, StateName, StateData) -> ..code to handle exits here.. {next_state, StateName1, StateData1}.</code> + <p>The code_change method also has to be implemented.</p> + <code type="none"> +code_change(OldVsn, StateName, StateData, Extra) -> + ..code to convert state (and more) during code change + {ok, NextStateName, NewStateData}</code> </section> </chapter> diff --git a/system/doc/design_principles/gen_server_concepts.xml b/system/doc/design_principles/gen_server_concepts.xml index 8131c47a69..231333da0e 100644 --- a/system/doc/design_principles/gen_server_concepts.xml +++ b/system/doc/design_principles/gen_server_concepts.xml @@ -264,6 +264,11 @@ terminate(normal, State) -> handle_info({'EXIT', Pid, Reason}, State) -> ..code to handle exits here.. {noreply, State1}.</code> + <p>The code_change method also has to be implemented.</p> + <code type="none"> +code_change(OldVsn, State, Extra) -> + ..code to convert state (and more) during code change + {ok, NewState}.</code> </section> </chapter> |