futex_cmp_requeue
r = futex_cmp_requeue(&futex1, 0, &futex2, 0,
EXPECT_EQ(1, futex_cmp_requeue(f1, 0, &f2, 0, 1, 0));
EXPECT_EQ(10, futex_cmp_requeue(f1, 0, &f2, 3, 7, 0));