睡眠， 等待， 阻塞，應該是乙個概念
睡眠相關的**位於
/include/linux/wait.h 和 /kernel/wait.c 中
1. 進入睡眠：
/**
* wait_event - sleep until a condition gets true
* @wq: the waitqueue to wait on
* @condition: a c expression for the event to wait for
** the process is put to sleep (task_uninterruptible) until the
* @condition evaluates to true. the @condition is checked each time
* the waitqueue @wq is woken up.
** wake_up() has to be called after changing any variable that could
* change the result of the wait condition.
*/#define wait_event(wq, condition) \
do while (0)
#define __wait_event(wq, condition) \
do \
finish_wait(&wq, &__wait); \
} while (0)
條件判斷 condition 用來實現這個睡眠、喚醒機制，
等待就是進入睡眠，需要 滿足條件condition 來喚醒。
2. 喚醒
#define wake_up(x) __wake_up(x, task_uninterruptible | task_interruptible, 1, null)
#define wake_up_nr(x, nr) __wake_up(x, task_uninterruptible | task_interruptible, nr, null)
#define wake_up_all(x) __wake_up(x, task_uninterruptible | task_interruptible, 0, null)
#define wake_up_interruptible(x) __wake_up(x, task_interruptible, 1, null)
#define wake_up_interruptible_nr(x, nr) __wake_up(x, task_interruptible, nr, null)
#define wake_up_interruptible_all(x) __wake_up(x, task_interruptible, 0, null)
#define wake_up_locked(x) __wake_up_locked((x), task_uninterruptible | task_interruptible)
#define wake_up_interruptible_sync(x) __wake_up_sync((x),task_interruptible, 1)
各種喚醒函式.
/**
* __wake_up - wake up threads blocked on a waitqueue.
* @q: the waitqueue
* @mode: which threads
* @nr_exclusive: how many wake-one or wake-many threads to wake up
* @key: is directly passed to the wakeup function
*/void fastcall __wake_up(wait_queue_head_t *q, unsigned int mode,
int nr_exclusive, void *key)
export_symbol(__wake_up);
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