040000 tree a0516d432f3c99147ddcdc7aece53a1b9af6fe04	thread.lock.algorithm
040000 tree f0343b525171a3344a2d8fceadc2afd508a7a51e	thread.lock
040000 tree 617cb2f2063af912fdfb3bd02af71a1b3c6061c7	thread.mutex.requirements
040000 tree 64f61378193359d9956c0674b4899c804b90a863	thread.once