Re: [PATCH V5 8/8] usb : Add usb port's power control attributes
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On 2012/6/30 23:22, Alan Stern wrote:
On Sat, 30 Jun 2012, Lan Tianyu wrote:Do you mean while a new device was enumerating, the port powered off? I guess the enumerating process will fail.That's what I thought too, but I haven't actually tried it. Something strange might happen when two different threads send concurrent messages to the same hub port. You might want to do a few experiments.Ok. I will do some experiments. But I guess it may be hard. Those two operation maybe too quirk to be simultaneous. :)Add ssleep() calls at the right spots. Then you can make anything happen the way you want. :-)
Good suggestion. Thanks. I will do.
What's concurrent messages? I think even from the two threads, messages will also be processed in the message queue in order. Right?Yes, they will be. But even so, messages from one thread might occur in between messages from a different thread. Alan Stern
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