System-wide mutex in Python on Linux

Question

Is there any easy way to have a system-wide mutex in Python on Linux? By \"system-wide\", I mean the mutex will be used by a group of Python processes; this is in c

Answer 1

My answer overlaps with the other answers, but just to add something people can copy-paste, I often do something like this.

class Locker:
    def __enter__ (self):
        self.fp = open("./lockfile.lck")
        fcntl.flock(self.fp.fileno(), fcntl.LOCK_EX)

    def __exit__ (self, _type, value, tb):
        fcntl.flock(self.fp.fileno(), fcntl.LOCK_UN)
        self.fp.close()

And then use it as:

print("waiting for lock")
with Locker():
    print("obtained lock")
    time.sleep(5.0)

To test, do touch lockfile.lck then run the above code in two or more different terminals (from the same directory).