Messages in this thread | | | Date | Tue, 2 Sep 2003 07:51:44 +0100 | From | Jamie Lokier <> | Subject | Re: [PATCH 2/2] Futex non-page-pinning fix |
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What happens after this sequence:
1. process A forks, making process B 2. B does FUTEX_FD, or splits into threads and one does FUTEX_WAIT, on a private page that has not been written to since the fork 3. A does FUTEX_WAIT on the same address 3. The page is swapped out 4. B does FUTEX_WAKE at the same address
Won't the futex be hashed on the swap entry at step 4, so that both processes are woken, yet only the waiter in B should be woken?
Related: could COW sharing after fork() explain the spurious wakeups I saw mentioned earlier in the thread?
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