0: enqueue
1: enqueue
2: enqueue
3: enqueue
4: enqueue
5: enqueue
6: enqueue
0: inside lock
1: inside lock
0: wait
1: wait
0: done
2: inside lock
1: done
3: inside lock
2: wait
3: wait
2: done
4: inside lock
3: done
5: inside lock
4: wait
5: wait
4: done
6: inside lock
5: done
6: wait
6: done
[
  200, 200, 200,
  200, 200, 200,
  200
]