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/** B+tree of active tasks.
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/** B+tree of active tasks.
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 *
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 *
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 * The task is guaranteed to exist after it was found in the tasks_btree as long as:
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 * The task is guaranteed to exist after it was found in the tasks_btree as long as:
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 * @li the tasks_lock is held,
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 * @li the tasks_lock is held,
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 * @li the task's lock is held when task's lock is acquired before releasing tasks_lock or
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 * @li the task's lock is held when task's lock is acquired before releasing tasks_lock or
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 * @li the task's refcount is grater than 0
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 * @li the task's refcount is greater than 0
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 *
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 *
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 */
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 */
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btree_t tasks_btree;
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btree_t tasks_btree;
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static task_id_t task_counter = 0;
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static task_id_t task_counter = 0;