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#define WAKEUP_FIRST    0
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#define WAKEUP_FIRST    0
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#define WAKEUP_ALL  1
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#define WAKEUP_ALL  1
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/** Wait queue structure. */
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/** Wait queue structure. */
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struct waitq {
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typedef struct {
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    /** Lock protecting wait queue structure.
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    /** Lock protecting wait queue structure.
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     *
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     *
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     * Must be acquired before T.lock for each T of type thread_t.
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     * Must be acquired before T.lock for each T of type thread_t.
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     */
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     */
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    SPINLOCK_DECLARE(lock);
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    SPINLOCK_DECLARE(lock);
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    int missed_wakeups; /**< Number of waitq_wakeup() calls that didn't find a thread to wake up. */
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    int missed_wakeups; /**< Number of waitq_wakeup() calls that didn't find a thread to wake up. */
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    link_t head;        /**< List of sleeping threads for wich there was no missed_wakeup. */
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    link_t head;        /**< List of sleeping threads for wich there was no missed_wakeup. */
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};
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} waitq_t;
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#define waitq_sleep(wq) \
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#define waitq_sleep(wq) \
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    waitq_sleep_timeout((wq),SYNCH_NO_TIMEOUT,SYNCH_FLAGS_NONE)
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    waitq_sleep_timeout((wq),SYNCH_NO_TIMEOUT,SYNCH_FLAGS_NONE)
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extern void waitq_initialize(waitq_t *wq);
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extern void waitq_initialize(waitq_t *wq);