Ulrich Drepper a écrit :
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Eric Dumazet wrote:
Do you mean POSIX allowed to mix PROCESS_PRIVATE and PROCESS_SHARED
condvar and mutexes ? Seems silly to me :(
Don't judge what you don't understand.
Yes, I kindly apologise for this crime.
> If all waiters are always in one
process but the notifiers can be in different processes, this setup
might make a lot of sense.
Thanks for providing this information.
I assume in this case the condvar is PSHARED, while mutex could be/is PRIVATE ?
I wonder how old (assuming all shared) code could work, since the notifier
would call FUTEX_CMP_REQUEUE giving a target address outside of this process vm ?
My understanding (probably bad, since I know nothing about POSIX as you mentioned)
- Old code could not use FUTEX_CMP_REQUEUE if mutex was private.
-> Old code was using a normal FUTEX_WAKE in this case.
So I repeat my question : Should we really add yer another futex command in
kernel for a corner case ?
Thanks
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