Hi folks,
We have finally managed to exorcise the fslock from the codebase. Both
1.25 and master no longer refer to it at all. We need to remove it from
the juju/utils package to make sure that people don't accidentally try
and use it again.
There is a new replacement, the juju/mutex package. To acquire a mutex,
you create a mutex.Spec structure. You must at least provide a name,
delay and clock. The delay is how long the code waits between tries to
acquire the mutex. Named mutexs are shared between processes on the same
machine. If a process holds the mutex and the process dies, the mutex is
automatically released. A spec can also have a timeout value, and/or an
abort channel.
On linux this is implemented with abstract domain sockets, on windows it
uses a named semaphore, and on other platforms a flock is used on a
named temp file.
https://godoc.org/github.com/juju/mutex
Cheers,
Tim
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