1False 2True 3False 4have lock 5---- 6task start 1 7task start 2 8task start 3 9task have 1 0 10task have 2 0 11task have 3 0 12task have 1 1 13task have 2 1 14task have 3 1 15task have 1 2 16task end 1 17task have 2 2 18task end 2 19task have 3 2 20task end 3 21---- 22task have True 23task release False 24task have True 25task release False 26task have again 27task have again 28---- 29task got 0 30task release 0 31task cancel 1 32task got 2 33task release 2 34False 35---- 36task got 0 37task cancel 1 38task release 0 39task got 2 40task cancel 2 41False 42