040000 tree a0516d432f3c99147ddcdc7aece53a1b9af6fe04	thread.lock.algorithm
040000 tree b3807f0d2cd75fca4157d7cf3c2874ffcf78263f	thread.lock
040000 tree 70f7c062aea1371c71e6e58e850a56e62b78e715	thread.mutex.requirements
040000 tree 09cad4e6e8d94563eb64431beaa572e766fc1781	thread.once