folly::rcu_synchronize

Declared in <folly/synchronization/Rcu.h>

Waits for all pre‐existing RCU readers to complete. RCU readers will normally be marked using the RAII interface std::scoped_lock<folly::rcu_domain>, as in:

std::scoped_lock<folly::rcu_domain> rcuReader(rcu_default_domain());

Other locking primitives that provide moveable semantics such as std::unique_lock may be used as well.

Note that rcu_synchronize is not obligated to wait for RCU readers that start after rcu_synchronize starts. Note also that holding a lock across rcu_synchronize that is acquired by any deleter (as in is passed to rcu_retire, retire, or call) will result in deadlock. Note that such deadlock will normally only occur with user‐written deleters, as in the default of delete will normally be immune to such deadlocks.

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