False
True
False
have lock
----
task start 1
task start 2
task start 3
task have 1 0
task have 2 0
task have 3 0
task have 1 1
task have 2 1
task have 3 1
task have 1 2
task end 1
task have 2 2
task end 2
task have 3 2
task end 3
----
task have True
task release False
task have True
task release False
task have again
task have again
----
task got 0
task release 0
task cancel 1
task got 2
task release 2
False
----
task got 0
task cancel 1
task release 0
task got 2
task cancel 2
False