0: lock acquired
1: lock acquired
2: lock acquired
3: lock acquired
4: lock acquired
5: lock acquired
6: lock acquired
7: lock acquired
8: lock acquired
9: lock acquired
0: lock released
1: lock released
2: lock released
3: lock released
4: lock released
5: lock released
6: lock released
7: lock released
8: lock released
9: lock released