A gotcha with fcntl file locking
Published .
Today I ran into an issue with fcntl(2) file locking [1] 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.
[1] Which is what OpenJDK uses for FileChannel#lock.
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Tags: *nix, Linux, JVM, programming, old blog.