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Now when tasklets are woken up via tasklet_wakeup(), tasklet_wakeup_on() or tasklet_wakeup_after(), either the optional wakeup flags will be used, or TASK_WOKEN_OTHER will be used. This allows tasklet handlers waking up for any given cause to notice whether or not they were also woken for another reason. For example, a mux handler could skip heavy parts when seeing that TASK_WOKEN_OTHER is absent, proving that no standard tasklet_wakeup() was done, for example in response to a subscribe(). The benefit of the TASK_WOKEN_* flags is that they're purged during the wakeup, and that they're easy to check for using TASK_WOKEN_ANY. TASK_F_UEVT1 and TASK_F_UEVT2 are also usable for private use (e.g. wakeup from a stream to a connection inside a mux). Probably that in the future, code dealing with subscribe events should start to place TASK_WOKEN_IO like is done for upper layers.