pg(3erl)						     Erlang Module Definition							  pg(3erl)

NAME

       pg - 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) -> ok | {error, Reason}

	      Types  PgName = term()
		     Reason = already_created | term()

	      Creates an empty group named PgName on the current node.

       create(PgName, Node) -> ok | {error, Reason}

	      Types  PgName = term()
		     Node = node()
		     Reason = already_created | term()

	      Creates an empty group named PgName on the node Node .

       join(PgName, Pid) -> Members

	      Types  PgName = term()
		     Pid = pid()
		     Members = [pid()]

	      Joins the pid Pid to the process group PgName . Returns a list of all old members of the group.

       send(PgName, Msg) -> void()

	      Types  PgName = Msg = term()

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

	      Failure: {badarg, {PgName, Msg}} if PgName is not a process group (a globally registered name).

       esend(PgName, Msg) -> void()

	      Types  PgName = Msg = term()

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

	      Failure: {badarg, {PgName, Msg}} if PgName is not a process group (a globally registered name).

       members(PgName) -> Members

	      Types  PgName = term()
		     Members = [pid()]

	      Returns a list of all members of the process group PgName .

Ericsson AB							   stdlib 1.17.3							  pg(3erl)