wait queue 8
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wait queue这边还剩下一下简单的函数和wait_on_bit_lock_action类似,对用都是wakeup函数都是__wake_up,只是参数不一样.
static inline int
wait_on_bit_lock_io(unsigned long *word, int bit, unsigned mode)
{
might_sleep();
if (!test_and_set_bit(bit, word))
return 0;
return out_of_line_wait_on_bit_lock(word, bit, bit_wait_io, mode);
}
wait_on_bit_lock_io 和 wait_on_bit_lock_action的作用是一样的,只是不用用户指定action了,且已经指定action=bit_wait_io
如果wait_on_bit_lock_action 的action指定为bit_wait_io,就和wait_on_bit_lock_io 是一模一样的。
static inline int
wait_on_bit_lock(unsigned long *word, int bit, unsigned mode)
{
might_sleep();
if (!test_and_set_bit(bit, word))
return 0;
return out_of_line_wait_on_bit_lock(word, bit, bit_wait, mode);
}
这个函数就是__wait_on_bit 的封装版,如果__wait_on_bit 的action是bit_wait的话,就和wait_on_bit_lock 一样了
__wait_on_bit(wqh, &wq, bit_wait, TASK_UNINTERRUPTIBLE);
static inline int
wait_on_bit_timeout(unsigned long *word, int bit, unsigned mode,
unsigned long timeout)
{
might_sleep();
if (!test_bit(bit, word))
return 0;
return out_of_line_wait_on_bit_timeout(word, bit,
bit_wait_timeout,
mode, timeout);
}
这个函数可以指定一个timeout,如果时间到了,还没有wakeup的话,就会在action也就是bit_wait_timeout函数中发送signal,user task可以监控这个
signal,如果有signal的话,就表示timeout了。如果在bit_wait_timeout 中调用wakeup 函数是不是会更好呢?
__sched int bit_wait_timeout(struct wait_bit_key *word, int mode)
{
unsigned long now = READ_ONCE(jiffies);
if (time_after_eq(now, word->timeout))
return -EAGAIN;
schedule_timeout(word->timeout - now);
if (signal_pending_state(mode, current))
return -EINTR;
return 0;
}
static inline int
wait_on_bit_lock_io(unsigned long *word, int bit, unsigned mode)
{
might_sleep();
if (!test_and_set_bit(bit, word))
return 0;
return out_of_line_wait_on_bit_lock(word, bit, bit_wait_io, mode);
}
wait_on_bit_lock_io 和 wait_on_bit_lock_action的作用是一样的,只是不用用户指定action了,且已经指定action=bit_wait_io
如果wait_on_bit_lock_action 的action指定为bit_wait_io,就和wait_on_bit_lock_io 是一模一样的。
static inline int
wait_on_bit_lock(unsigned long *word, int bit, unsigned mode)
{
might_sleep();
if (!test_and_set_bit(bit, word))
return 0;
return out_of_line_wait_on_bit_lock(word, bit, bit_wait, mode);
}
这个函数就是__wait_on_bit 的封装版,如果__wait_on_bit 的action是bit_wait的话,就和wait_on_bit_lock 一样了
__wait_on_bit(wqh, &wq, bit_wait, TASK_UNINTERRUPTIBLE);
static inline int
wait_on_bit_timeout(unsigned long *word, int bit, unsigned mode,
unsigned long timeout)
{
might_sleep();
if (!test_bit(bit, word))
return 0;
return out_of_line_wait_on_bit_timeout(word, bit,
bit_wait_timeout,
mode, timeout);
}
这个函数可以指定一个timeout,如果时间到了,还没有wakeup的话,就会在action也就是bit_wait_timeout函数中发送signal,user task可以监控这个
signal,如果有signal的话,就表示timeout了。如果在bit_wait_timeout 中调用wakeup 函数是不是会更好呢?
__sched int bit_wait_timeout(struct wait_bit_key *word, int mode)
{
unsigned long now = READ_ONCE(jiffies);
if (time_after_eq(now, word->timeout))
return -EAGAIN;
schedule_timeout(word->timeout - now);
if (signal_pending_state(mode, current))
return -EINTR;
return 0;
}
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