pg

MODULE

pg

MODULE SUMMARY

Distributed, Named Process Groups

DESCRIPTION

This (experimental) module implements process groups. A process group is a group of processes that can be accessed by a common name. For example, a group named foobar can include a set of processes as members of this group and they can be located on different nodes.

When messages are sent to the named group, all members of the group receive the message. The messages are serialized. If the process P1 sends the message M1 to the group, and process P2 simultaneously sends message M2, then all members of the group receive the two messages in the same order. If members of a group terminate, they are automatically removed from the group.

This module is not complete. The module is inspired by the ISIS system and the causal order protocol of the ISIS system should also be implemented. At the moment, all messages are serialized by sending them through a group master process.

EXPORTS

create(PgName)

Creates an empty group named PgName on the current node.

create(PgName, Node)

Creates an epmty group on the node Node.

join(PgName, Pid)

Joins the Pid Pid to the process group PgName.

send(Pgname, Message)

Sends the tuple {pg_message, From, PgName, Message} to all members of the process group.

esend(PgName, Mess)

Sends the tuple {pg_message, From, PgName, Message} to all members of the process group, except the current node.

members(PgName)

Returns a list of the current members in the process group.

AUTHORS

Claes Wikstrom - support@erlang.ericsson.se