Hi, Raghavendra, pranjas:
Thanks for your reply, add_wait_queue_exclusive() is perfect.
----- 原始邮件 -----
发件人：Raghavendra <ar...@cdac.in>
收件人：kernelnewbies@kernelnewbies.org
主题：Re: How can I wake up one process from the wait queue?
日期：2014年10月30日 16点52分
On Thursday 30 October 2014 02:02 PM,
Rock Lee wrote:
Hi, everyone
I am implementing a simple driver to experiment with wait
queue.Two or more read processes block until a write process
changes a flag and call wake_up_interruptible().I expect that a
write process will only wake up one read process.However, once a
write process calls wake_up_interruptible() , all the read
processes are awaken. How can I wake up one process
from the wait queue?
You can use exclusive wait queues, which wakes up only one process
from the queue.
Although the general idea that is followed is: all the process are
woken up once the resource is made available. And then the access to
that resource is guarded by a lock, which in turn allows only one
process to access the resource. Rest of the processes are pushed
backed to sleep(or busy wait).
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