040000 tree e17742bebe45fb700ea7a56728f19a0c6f987725	thread.lock.algorithm
040000 tree a29f65002e20d30f5f9508e4e9c2751b5891579f	thread.lock
040000 tree b693f3f0c4b0abd53448f0b3a347e6737014e9a0	thread.mutex.requirements
040000 tree 8b78506a14bdec18d8a2272a746ad7d2651b3be5	thread.once