Ondřej Surý c2c907d728 Improve the Userspace RCU integration ...

This commit allows BIND 9 to be compiled with different flavours of
Userspace RCU, and improves the integration between Userspace RCU and
our event loop:

- In the RCU QSBR, the thread is put offline when polling and online
  when rcu_dereference, rcu_assign_pointer (or friends) are called.

- In other RCU modes, we check that we are not reading when reaching the
  quiescent callback in the event loop.

- We register the thread before uv_work_run() callback is called and
  after it has finished.  The rcu_(un)register_thread() has a large
  overhead, but that's fine in this case.

2023-04-27 12:38:53 +02:00

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