040000 tree 94d8a276cb3f07523c5279754cf0d3cf468410eb	thread.lock.algorithm
040000 tree 82219da3c8c13fdb54c173f36778e26c632217d7	thread.lock
040000 tree c296c4e7726d169600d61a160c070a4ce83ca619	thread.mutex.requirements
040000 tree c358bca73af57d74c82a3d043ce42bcb97f24ead	thread.once