module documentation

PID file.
Interface IPIDFile Manages a file that remembers a process ID.
Class AlreadyRunningError Process is already running.
Class InvalidPIDFileError PID file contents are invalid.
Class NonePIDFile PID file implementation that does nothing.
Class NoPIDFound No PID found in PID file.
Class PIDFile Concrete implementation of IPIDFile.
Class StalePIDFileError PID file contents are valid, but there is no process with the referenced PID.
Variable nonePIDFile Undocumented
nonePIDFile: IPIDFile = (source)