A gotcha with fcntl file locking
Today I ran into an issue with fcntl(2) file locking1 on Linux. A little research confirmed my fear:
From “On the Brokenness of File Locking”:
The worst part however is that POSIX locks are automatically released if a process calls
close()
on any (!) of its open file descriptors for that file.
The whole post is well worth a read.
Which is what OpenJDK uses for FileChannel#lock.↩︎