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Update extend.qbk

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Klemens Morgenstern 2017-08-02 09:36:53 +02:00 committed by GitHub
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@ -108,6 +108,7 @@ struct async_foo : __handler__, __require_io_service__
}
};
```
[caution All async_handlers use one signal(SIGCHLD) on posix, which is only guaranteed to work when all use the same `io_service`]
[note Inheriting [globalref boost::process::extend::require_io_service require_io_service] is necessary, so [funcref boost::process::system system] provides one.]