CHECK_LOCKFILE([lock_blocks_other_process], [1])
CHECK_LOCKFILE([lock_twice_blocks_other_process], [1])
CHECK_LOCKFILE([lock_and_unlock_allows_other_process], [1])
CHECK_LOCKFILE([lock_blocks_other_process], [1])
CHECK_LOCKFILE([lock_twice_blocks_other_process], [1])
CHECK_LOCKFILE([lock_and_unlock_allows_other_process], [1])