There are 2 way of adding item to wait_queue,
1. add_wait_queue()
2. add_wait_queue_exclusive()
and add_wait_queue_exclusive() is very useful API.
unforunately, poll_wait_exclusive() against poll_wait() doesn't exist.
it means there is no way that wake up only 1 process where polled.
There are 2 way of adding item to wait_queue,
1. add_wait_queue()
2. add_wait_queue_exclusive()
and add_wait_queue_exclusive() is very useful API.
unforunately, poll_wait_exclusive() against poll_wait() doesn't exist.
it means there is no way that wake up only 1 process where polled.
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