040000 tree a0516d432f3c99147ddcdc7aece53a1b9af6fe04	thread.lock.algorithm
040000 tree 8c841e38496c73ee464d2015eba6718fcf3cf796	thread.lock
040000 tree 85e7939a55e3e45ee0fa844277e29d3a4f547dcc	thread.mutex.requirements
040000 tree 09cad4e6e8d94563eb64431beaa572e766fc1781	thread.once