question about wait_event

[yeyouqun]

Hi guys,I have some doubt about "wait_event". One group processes, say 
A, they calls "wait_event (wq, 1)", and one single process B calls 
"wake_up_all", the question is:

    B only run once, so all the processes in A that hold the lock of 
"wq" after B process, which will sleep on the "wq" forever, is it true? 
If true, how to stop it from happening?
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