1 inc_counter(): count = 1, unlocking mutex 2 inc_counter(): count = 2, unlocking mutex 3 inc_counter(): count = 3, unlocking mutex 4 inc_counter(): count = 4, unlocking mutex 5 inc_counter(): count = 5, unlocking mutex 6 inc_counter(): count = 6, unlocking mutex 7 inc_counter(): count = 7, unlocking mutex 8 inc_counter(): count = 8, unlocking mutex 9 inc_counter(): count = 9, unlocking mutex 10 inc_counter(): count = 10, unlocking mutex 11 inc_counter(): count = 11, unlocking mutex 12 inc_counter(): count = 12, unlocking mutex 13 hit threshold! 14 inc_counter(): count = 13, unlocking mutex 15 inc_counter(): count = 14, unlocking mutex 16 inc_counter(): count = 15, unlocking mutex 17 inc_counter(): count = 16, unlocking mutex 18 inc_counter(): count = 17, unlocking mutex 19 inc_counter(): count = 18, unlocking mutex 20 inc_counter(): count = 19, unlocking mutex 21 inc_counter(): count = 20, unlocking mutex 22 condvar was hit! 23