040000 tree c2af39634dbbb7f467f38fc052c4e27e26fd7367	thread.lock.algorithm
040000 tree 014636c1fc7540d57d6ab7135c111f97085c8a14	thread.lock
040000 tree 86b762a2e62b784d85e9fd60c5157fded5274f54	thread.mutex.requirements
040000 tree 75716578f2ed0ab08d714dcfd1848ac266a1fa4e	thread.once