Messages in this thread | | | Date | Wed, 7 Mar 2007 21:20:33 +0100 (MET) | From | Jan Engelhardt <> | Subject | Re: Sleeping thread not receive signal until it wakes up |
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On Mar 7 2007 08:19, linux-os (Dick Johnson) wrote: > >Later versions of the kernel lock the kernel when an ioctl() is >entered. This means that if you sleep in the ioctl(), nothing >will get scheduled.
Later versions of the kernel also have an ->unlocked_ioctl method, which is probably better than below's approach [which is akin to FreeBSD's DROP_GIANT/PICKUP_GIANT].
>You can do the following (possibly unsafe) in your ioctl(): > > int locked = kernel_locked(); > > ......... code > ......... code > > if(locked) // Before sleeping section > unlock_kernel(); > .......... sleeping code > if(locked) // After sleeping section > lock_kernel(); > >
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