1TAP version 13
 21..2
 3# selftests: membarrier: membarrier_test_single_thread
 4# TAP version 13
 5# 1..2
 6# ok 1 sys_membarrier available
 7# ok 2 sys membarrier invalid command test: command = -1, flags = 0, errno = 22. Failed as expected
 8ok 1 selftests: membarrier: membarrier_test_single_thread
 9# selftests: membarrier: membarrier_test_multi_thread
10# TAP version 13
11# 1..2
12# ok 1 sys_membarrier available
13# ok 2 sys membarrier invalid command test: command = -1, flags = 0, errno = 22. Failed as expected
14ok 2 selftests: membarrier: membarrier_test_multi_thread