tv(3erl) Erlang Module Definition tv(3erl)NAME
tv - TV graphically examines ETS and Mnesia tables.
DESCRIPTION
TV enables the user to examine ETS and Mnesia tables. Once a certain table has been opened in the tool, the content may be viewed at vari-
ous levels of detail. The content viewed may also be sorted, using any element as key. The table may be polled anytime; either regularly at
specified intervals, or manually. New and deleted objects, as well as those altered, are marked with characteristic colors.
EXPORTS
start() -> Pid
Types Pid = pid()
start/0 starts the TV.
SEE ALSO
For a complete description of the TV, please see the TV User's Guide.
Ericsson AB tv 2.1.4.6 tv(3erl)
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pg2(3erl) Erlang Module Definition pg2(3erl)NAME
pg2 - Distributed Named Process Groups
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 mes-
sage 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 pro-
cesses 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.
Warning:
This module is used by the disk_log module for managing distributed disk logs. The disk log names are used as group names, which means that
some action may need to be taken to avoid name clashes.
EXPORTS
create(Name) -> void()
Types Name = term()
Creates a new, empty process group. The group is globally visible on all nodes. If the group exists, nothing happens.
delete(Name) -> void()
Types Name = term()
Deletes a process group.
get_closest_pid(Name) -> Pid | {error, Reason}
Types Name = term()
Pid = pid()
Reason = {no_process, Name} | {no_such_group, Name}
This is a useful dispatch function which can be used from client functions. It returns a process on the local node, if such a
process exist. Otherwise, it chooses one randomly.
get_members(Name) -> [Pid] | {error, Reason}
Types Name = term()
Pid = pid()
Reason = {no_such_group, Name}
Returns all processes in the group Name . This function should be used from within a client function that accesses the group. It is
therefore optimized for speed.
get_local_members(Name) -> [Pid] | {error, Reason}
Types Name = term()
Pid = pid()
Reason = {no_such_group, Name}
Returns all processes running on the local node in the group Name . This function should to be used from within a client function
that accesses the group. It is therefore optimized for speed.
join(Name, Pid) -> ok | {error, Reason}
Types Name = term()
Pid = pid()
Reason = {no_such_group, Name}
Joins the process Pid to the group Name . A process can join a group several times; it must then leave the group the same number of
times.
leave(Name, Pid) -> ok | {error, Reason}
Types Name = term()
Pid = pid()
Reason = {no_such_group, Name}
Makes the process Pid leave the group Name . If the process is not a member of the group, ok is returned.
which_groups() -> [Name]
Types Name = term()
Returns a list of all known groups.
start()
start_link() -> {ok, Pid} | {error, Reason}
Types Pid = pid()
Reason = term()
Starts the pg2 server. Normally, the server does not need to be started explicitly, as it is started dynamically if it is needed.
This is useful during development, but in a target system the server should be started explicitly. Use configuration parameters for
kernel for this.
SEE ALSO kernel(7) , pg(3erl)Ericsson AB kernel 2.14.3 pg2(3erl)