erlang:Distributed Named Process Groups(pg2)

DESCRIPTION

This module implements process groups. The groups in this module differ from the groups in the module pg in several ways. In pg, each message is sent to all members in the group. In this module, each message may be sent to one, some, or all members.

A group of processes can be accessed by a common name. For example, if there is a group named foobar, there can be a set of processes (which can be located on different nodes) which are all members of the group foobar. There are no special functions for sending a message to the group. Instead, client functions should be written with the functions get_members/1 and get_local_members/1 to find out which processes are members of the group. Then the message can be sent to one or more members of the group.

If a member terminates, it is automatically removed from the group.

分布式进程组，多用于监控