How to manage thread execution?

Hi friends,
I have a scenario like in my program i have created three threads like t1,t2,t3 and i have started thread t1and t2 at the same time and i have to put the condition like t3 will be started only when t2 finishes before t1 otherwise t3 will not be started.
Please tell me the logic for doing that.
Thanks.

You have a flag.
The execution path for t2 sets that flag when t2 is finished.
The execution path for t1 checks the flag at the end of the execution. If the flag is set then create t3 and start it.

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