040000 tree e17742bebe45fb700ea7a56728f19a0c6f987725	thread.lock.algorithm
040000 tree 359a77d8961969eb06065fd0e8dd76b4b6e89f14	thread.lock
040000 tree 1337130e1cf381cc1161766d993692dd691916bf	thread.mutex.requirements
040000 tree 8b78506a14bdec18d8a2272a746ad7d2651b3be5	thread.once