mnesia_registry(3erl) [linux man page]

mnesia_registry(3erl)					     Erlang Module Definition					     mnesia_registry(3erl)

NAME

       mnesia_registry - Dump support for registries in erl_interface.

DESCRIPTION

       The module mnesia_registry is usually part of erl_interface , but for the time being, it is a part of the Mnesia application.

       mnesia_registry is mainly an module intended for internal usage within OTP, but it has two functions that are exported for public use.

       On C-nodes erl_interface has support for registry tables. These reside in RAM on the C-node but they may also be dumped into Mnesia tables.
       By default, the dumping of registry tables via erl_interface causes a corresponding Mnesia table to be  created	with  mnesia_registry:cre-
       ate_table/1 if necessary.

       The  tables that are created with these functions can be administered as all other Mnesia tables. They may be included in backups or repli-
       cas may be added etc. The tables are in fact normal Mnesia tables owned by the user of the corresponding erl_interface registries.

EXPORTS

       create_table(Tab) -> ok | exit(Reason)

	      This is a wrapper function for mnesia:create_table/2 which creates a table (if there is no existing table) with an  appropriate  set
	      of  attributes . The table will only reside on the local node and its storage type will be the same as the schema table on the local
	      node, ie. {ram_copies,[node()]} or {disc_copies,[node()]} .

	      It is this function that is used by erl_interface to create the Mnesia table if it did not already exist.

       create_table(Tab, TabDef) -> ok | exit(Reason)

	      This is a wrapper function for mnesia:create_table/2 which creates a table (if there is no existing table) with an  appropriate  set
	      of  attributes  .  The  attributes  and  TabDef  are forwarded to mnesia:create_table/2 . For example, if the table should reside as
	      disc_only_copies on all nodes a call would look like:

			TabDef = [{{disc_only_copies, node()|nodes()]}],
			mnesia_registry:create_table(my_reg, TabDef)

SEE ALSO

       mnesia(3erl), erl_interface(3erl)

Ericsson AB							   mnesia 4.4.17					     mnesia_registry(3erl)

erl_global(3erl)						C Library Functions						  erl_global(3erl)

NAME

       erl_global - Access globally registered names

DESCRIPTION

       This module provides support for registering, looking up and unregistering names in the Erlang Global module. For more information, see the
       description of Global in the reference manual.

       Note that the functions below perform an RPC using an open file descriptor provided by the caller. This file descriptor must  not  be  used
       for other traffic during the global operation or the function may receive unexpected data and fail.

EXPORTS

       char ** erl_global_names(fd,count)

	      Types  int fd;
		     int *count;

	      Retrieve a list of all known global names.

	      fd is an open descriptor to an Erlang connection.

	      count is the address of an integer, or NULL. If count is not NULL, it will be set by the function to the number of names found.

	      On  success,  the  function  returns  an array of strings, each containing a single registered name, and sets count to the number of
	      names found. The array is terminated by a single NULL pointer. On failure, the function returns NULL and count is not modified.

   Note:
       It is the caller's responsibility to free the array afterwards. It has been allocated by the function with a single call to malloc() , so a
       single free() is all that is necessary.

       int erl_global_register(fd,name,pid)

	      Types  int fd;
		     const char *name;
		     ETERM *pid;

	      This function registers a name in Global.

	      fd is an open descriptor to an Erlang connection.

	      name is the name to register in Global.

	      pid  is  the pid that should be associated with name . This is the value that Global will return when processes request the location
	      of name .

	      The function returns 0 on success, or -1 on failure.

       int erl_global_unregister(fd,name)

	      Types  int fd;
		     const char *name;

	      This function unregisters a name from Global.

	      fd is an open descriptor to an Erlang connection.

	      name is the name to unregister from Global.

	      The function returns 0 on success, or -1 on failure.

       ETERM * erl_global_whereis(fd,name,node)

	      Types  int fd;
		     const char *name;
		     char *node;

	      fd is an open descriptor to an Erlang connection.

	      name is the name that is to be looked up in Global.

	      If node is not NULL, it is a pointer to a buffer where the function can fill in the name of the node where name is found.  node  can
	      be passed directly to erl_connect() if necessary.

	      On  success,  the function returns an Erlang Pid containing the address of the given name, and node will be initialized to the node-
	      name where name is found. On failure NULL will be returned and node will not be modified.

Ericsson AB							erl_interface 3.7.3						  erl_global(3erl)