/usr/include/mongo/util/concurrency/ is in mongodb-dev 1:2.4.9-1ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/mongo/util/concurrency/list.h
/usr/include/mongo/util/concurrency/mapsf.h
/usr/include/mongo/util/concurrency/msg.h
/usr/include/mongo/util/concurrency/mutex.h
/usr/include/mongo/util/concurrency/mutexdebugger.h
/usr/include/mongo/util/concurrency/mvar.h
/usr/include/mongo/util/concurrency/qlock.h
/usr/include/mongo/util/concurrency/race.h
/usr/include/mongo/util/concurrency/rwlock.h
/usr/include/mongo/util/concurrency/rwlockimpl.h
/usr/include/mongo/util/concurrency/shared_mutex_win.hpp
/usr/include/mongo/util/concurrency/simplerwlock.h
/usr/include/mongo/util/concurrency/spin_lock.h
/usr/include/mongo/util/concurrency/synchronization.h
/usr/include/mongo/util/concurrency/task.h
/usr/include/mongo/util/concurrency/thread_pool.h
/usr/include/mongo/util/concurrency/threadlocal.h
/usr/include/mongo/util/concurrency/ticketholder.h
/usr/include/mongo/util/concurrency/value.h