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authorNiclas Axelsson <[email protected]>2011-03-09 17:29:54 +0100
committerNiclas Axelsson <[email protected]>2011-03-09 17:34:01 +0100
commit4668c233c8f850eb5c3e04e760b25d34b73aa497 (patch)
tree137e2bb3954b3976c328a286f94a926ad526cea2 /system/doc/design_principles/events.xml
parent3ad2818405636fcf8b0d7b50ce5d7add83578738 (diff)
parent1fb616dac50969cef3f260ec9d899f2f980fca1d (diff)
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Merge branch 'gl/gen_server-doc' into dev
* gl/gen_server-doc: Update Handling Other Messages section in gen_server, gen_fsm, gen_events overviews OTP-9121
Diffstat (limited to 'system/doc/design_principles/events.xml')
-rw-r--r--system/doc/design_principles/events.xml17
1 files changed, 17 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>