Create is like os.Create, but returns a write-locked file.

Edit creates the named file with mode 0666 (before umask), but does not truncate existing contents.

MutexAt returns a new Mutex with Path set to the given non-empty path.

Open is like os.Open, but returns a read-locked file.

OpenFile is like os.OpenFile, but returns a locked file.

Read opens the named file with a read-lock and returns its contents.

Transform invokes t with the result of reading the named file, with its lock still held.

Write opens the named file (creating it with the given permissions if needed), then write-locks it and overwrites it with the given content.

A File is a locked *os.File.

A Mutex provides mutual exclusion within and across processes by locking a well-known file.