040000 tree e17742bebe45fb700ea7a56728f19a0c6f987725	thread.lock.algorithm
040000 tree b090807b75b943b7696254955dffb2118ba9f61b	thread.lock
040000 tree 411ce793b399e4e1b83b856c944e357c74ba2e10	thread.mutex.requirements
040000 tree 3ee862f1092b17e9e1704ef91facb90c8f07f763	thread.once