040000 tree c2af39634dbbb7f467f38fc052c4e27e26fd7367	thread.lock.algorithm
040000 tree 6d2c680307c3ca98320019560688cde9cf101a2c	thread.lock
040000 tree 38a28f007e9e798851f21fb8b7119f1264f48ee2	thread.mutex.requirements
040000 tree e3d93f08d5549f2b05f24646be29e6a848b4db2c	thread.once