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    "Entering",
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    "Entering",
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    "Exiting",
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    "Exiting",
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    "Undead"
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    "Undead"
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};
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};
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/** Lock protecting threads_head list. For locking rules, see declaration thereof. */
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/** Lock protecting the threads_btree B+tree. For locking rules, see declaration thereof. */
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SPINLOCK_INITIALIZE(threads_lock);
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SPINLOCK_INITIALIZE(threads_lock);
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btree_t threads_btree;          /**< B+tree of all threads. */
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/** B+tree of all threads.
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 *
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 * When a thread is found in the threads_btree B+tree, it is guaranteed to exist as long
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 * as the threads_lock is held.
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 */
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btree_t threads_btree;     
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SPINLOCK_INITIALIZE(tidlock);
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SPINLOCK_INITIALIZE(tidlock);
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__u32 last_tid = 0;
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__u32 last_tid = 0;
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static slab_cache_t *thread_slab;
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static slab_cache_t *thread_slab;
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/** Check whether thread exists.
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/** Check whether thread exists.
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 *
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 *
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 * Note that threads_lock must be already held and
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 * Note that threads_lock must be already held and
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 * interrupts must be already disabled.
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 * interrupts must be already disabled.
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 *
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 *
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 * When a thread is found in threads_btree, it is guaranteed to exist as long
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 * as the threads_lock is held.
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 *
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 * @param t Pointer to thread.
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 * @param t Pointer to thread.
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 *
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 *
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 * @return True if thread t is known to the system, false otherwise.
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 * @return True if thread t is known to the system, false otherwise.
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 */
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 */
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bool thread_exists(thread_t *t)
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bool thread_exists(thread_t *t)