POSIX folks: What's the recommended way to create a system-wide mutex shared by all user accounts on a system?
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I tried using flock(LOCK_EX) with a file in /tmp but this seems to only work between processes running under a single user
that's unexpected. I've just tried flock(LOCK_EX) from two different users and it seems to work fine..
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but flock() is not POSIX. It's a BSD system call. fcntl() advisory record locking is a POSIX API.
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