diff options
Diffstat (limited to 'lib/stdlib/doc/src')
| -rw-r--r-- | lib/stdlib/doc/src/gen_statem.xml | 32 |
1 files changed, 27 insertions, 5 deletions
diff --git a/lib/stdlib/doc/src/gen_statem.xml b/lib/stdlib/doc/src/gen_statem.xml index 3322571b2c..17f1526a21 100644 --- a/lib/stdlib/doc/src/gen_statem.xml +++ b/lib/stdlib/doc/src/gen_statem.xml @@ -919,18 +919,40 @@ handle_event(_, _, State, Data) -> </p> <note> <p> - For <c><anno>Timeout</anno> =/= infinity</c>, + For <c><anno>Timeout</anno> < infinity</c>, to avoid getting a late reply in the caller's - inbox, this function spawns a proxy process that + inbox if the caller should catch exceptions, + this function spawns a proxy process that does the call. A late reply gets delivered to the dead proxy process, hence gets discarded. This is less efficient than using - <c><anno>Timeout</anno> =:= infinity</c>. + <c><anno>Timeout</anno> == infinity</c>. </p> </note> <p> - The call can fail, for example, if the <c>gen_statem</c> dies - before or during this function call. + <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>{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>, + while <c>{dirty_timeout,<anno>T</anno>}</c> + bypasses the proxy process which is more lightweight. + </p> + <note> + <p> + If you combine catching exceptions from this function + with <c>{dirty_timeout,<anno>T</anno>}</c> + to avoid that the calling process dies when the call + times out, you will have to be prepared to handle + a late reply. + So why not just allow the calling process to die? + </p> + </note> + <p> + The call can also fail, for example, if the <c>gen_statem</c> + dies before or during this function call. </p> </desc> </func> |