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| author | Raimo Niskanen <[email protected]> | 2017-02-22 15:50:07 +0100 |
|---|---|---|
| committer | Raimo Niskanen <[email protected]> | 2017-02-23 08:39:01 +0100 |
| commit | f1365135f1dd0b57849317b77e8bc9a1e0fd6307 (patch) | |
| tree | 608207e3aaeacb5b19975e868ba33fdd93949cf0 /lib/stdlib/doc/src/gen_statem.xml | |
| parent | 2f5f4ea9afccb7d8c82bdeb56440b1e43d9f34d0 (diff) | |
| download | otp-f1365135f1dd0b57849317b77e8bc9a1e0fd6307.tar.gz otp-f1365135f1dd0b57849317b77e8bc9a1e0fd6307.tar.bz2 otp-f1365135f1dd0b57849317b77e8bc9a1e0fd6307.zip | |
Clarify code_change and callback mode change
Diffstat (limited to 'lib/stdlib/doc/src/gen_statem.xml')
| -rw-r--r-- | lib/stdlib/doc/src/gen_statem.xml | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/lib/stdlib/doc/src/gen_statem.xml b/lib/stdlib/doc/src/gen_statem.xml index b20abbea5d..d19602b67c 100644 --- a/lib/stdlib/doc/src/gen_statem.xml +++ b/lib/stdlib/doc/src/gen_statem.xml @@ -1685,6 +1685,19 @@ handle_event(_, _, State, Data) -> It is recommended to use an atom as <c>Reason</c> since it will be wrapped in an <c>{error,Reason}</c> tuple. </p> + <p> + Also note when upgrading a <c>gen_statem</c>, + this function and hence + the <c>Change={advanced,Extra}</c> parameter in the + <seealso marker="sasl:appup"><c>appup</c></seealso> file + is not only needed to update the internal state + or to act on the <c>Extra</c> argument. + It is also needed if an upgrade or downgrade should change + <seealso marker="#type-callback_mode"><em>callback mode</em></seealso>, + or else the callback mode after the code change + will not be honoured, + most probably causing a server crash. + </p> </desc> </func> |