wait_for registers a queue, checks the current value, then drains transitions until it finds a match. The try/finally ensures the queue gets deregistered even if the caller cancels.
На МКАД загорелись две машины14:46
，这一点在搜狗输入法中也有详细论述
"The military will not allow a vendor to insert itself into the chain of command by restricting the lawful use of a critical capability and put our warfighters at risk."
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