$ ./th2
In main: creating thread 0
Hello World! It's me, child in thread #0!
In main: creating thread 1
Hello World! It's me, child in thread #1!
In main: creating thread 2
Hello World! It's me, child in thread #2!
In main: creating thread 3
Hello World! It's me, child in thread #3!
In main: creating thread 4
Hello World! It's me, child in thread #4!


Good Bay World! It's me, thread #0!
Good Bay World! It's me, thread #1!
Good Bay World! It's me, thread #2!
Good Bay World! It's me, thread #3!
Good Bay World! It's me, thread #4!

[return to shell and, after some seconds] 

$ 
Good bay World! It's me, child in thread #0!
Good bay World! It's me, child in thread #1!
Good bay World! It's me, child in thread #2!
Good bay World! It's me, child in thread #3!
Good bay World! It's me, child in thread #4!