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/** Find task structure corresponding to task ID.
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/** Find task structure corresponding to task ID.
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 *
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 *
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 * The tasks_lock must be already held by the caller of this function
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 * The tasks_lock must be already held by the caller of this function
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 * and interrupts must be disabled.
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 * and interrupts must be disabled.
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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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 * @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 refcount is grater than 0
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 *
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 * @param id Task ID.
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 * @param id Task ID.
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 *
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 *
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 * @return Task structure address or NULL if there is no such task ID.
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 * @return Task structure address or NULL if there is no such task ID.
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 */
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 */
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task_t *task_find_by_id(task_id_t id)
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task_t *task_find_by_id(task_id_t id)