PTGroups

N.B. PTGroups have been replaced with CGrpFS, which implements the CGroups filesystem using either FUSE or PUFFS on BSD platform.

Process Tracking Groups, or PTGroups, are a lightweight abstraction providing a CGroups-like interface to groups of processes tracked by an appropriate mechanism for detecting forks and exits, e.g. the PROC event filter for Kernel Queues on BSD platforms.