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Task::run() would schedule a new execution of Task, unless it was waiting on a queue for execution. This cannot be implemented with a bool, since a Task might be included in multiple queues, and should still be in waiting state even when executed in that case. Replace the bool with a counter. run() and append() (but not append_nolock) increment the counter, exec() decrements the counter. If the counter is non-zero when run() or append() is called, the Task is not scheduled. Signed-off-by: Zygo Blaxell <bees@furryterror.org>