[init -> test-tls] main initial: x: -1, y: 0 [init -> test-tls] thread 0 initial: x: -1, y: 0 [init -> test-tls] thread 0 : x: 1, y: 2 [init -> test-tls] thread 1 initial: x: -1, y: 0 [init -> test-tls] thread 1 : x: 3, y: 4 [init -> test-tls] main : x: 5, y: 6