static inline void init_waitqueue_head(wait_queue_head_t *q)
{
- q->lock = SPIN_LOCK_UNLOCKED;
+ spin_lock_init(&q->lock);
INIT_LIST_HEAD(&q->task_list);
}
finish_wait(&wq, &__wait); \
} while (0)
+/**
+ * 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 { \
if (condition) \
finish_wait(&wq, &__wait); \
} while (0)
+/**
+ * wait_event_timeout - sleep until a condition gets true or a timeout elapses
+ * @wq: the waitqueue to wait on
+ * @condition: a C expression for the event to wait for
+ * @timeout: timeout, in jiffies
+ *
+ * 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.
+ *
+ * The function returns 0 if the @timeout elapsed, and the remaining
+ * jiffies if the condition evaluated to true before the timeout elapsed.
+ */
#define wait_event_timeout(wq, condition, timeout) \
({ \
long __ret = timeout; \
finish_wait(&wq, &__wait); \
} while (0)
+/**
+ * wait_event_interruptible - 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_INTERRUPTIBLE) until the
+ * @condition evaluates to true or a signal is received.
+ * 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.
+ *
+ * The function will return -ERESTARTSYS if it was interrupted by a
+ * signal and 0 if @condition evaluated to true.
+ */
#define wait_event_interruptible(wq, condition) \
({ \
int __ret = 0; \
finish_wait(&wq, &__wait); \
} while (0)
+/**
+ * wait_event_interruptible_timeout - sleep until a condition gets true or a timeout elapses
+ * @wq: the waitqueue to wait on
+ * @condition: a C expression for the event to wait for
+ * @timeout: timeout, in jiffies
+ *
+ * The process is put to sleep (TASK_INTERRUPTIBLE) until the
+ * @condition evaluates to true or a signal is received.
+ * 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.
+ *
+ * The function returns 0 if the @timeout elapsed, -ERESTARTSYS if it
+ * was interrupted by a signal, and the remaining jiffies otherwise
+ * if the condition evaluated to true before the timeout elapsed.
+ */
#define wait_event_interruptible_timeout(wq, condition, timeout) \
({ \
long __ret = timeout; \
wait_queue_t name = { \
.task = current, \
.func = autoremove_wake_function, \
- .task_list = { .next = &(name).task_list, \
- .prev = &(name).task_list, \
- }, \
+ .task_list = LIST_HEAD_INIT((name).task_list), \
}
#define DEFINE_WAIT_BIT(name, word, bit) \