040000 tree a0516d432f3c99147ddcdc7aece53a1b9af6fe04	thread.lock.algorithm
040000 tree b9afbde1dc5217aafccb238f34e5f51981487e37	thread.lock
040000 tree d5d58af37a6a0631eeef4bed0e287f433a784ab3	thread.mutex.requirements
040000 tree 09cad4e6e8d94563eb64431beaa572e766fc1781	thread.once