This issue came to light in #20 that file locking does not work and insists on not working. I tried to do something about it under linux and that did not work. I'll do some more if I can and hopefully get that working.
On the redox side of things, file locking is completely unimplemented, even though the open flags are there. I may do some work. @jackpot51 is there an issue in another repository that is tracking the status of file locking in Redox?