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