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<img alt="Erlang logo" src="../../../../doc/erlang-logo.png"><br><small><a href="index.html">Reference Manual</a><br><a href="release_notes.html">Release Notes</a><br><a href="../pdf/kernel-2.15.3.pdf">PDF</a><br><a href="../../../../doc/index.html">Top</a></small><p><strong>Kernel</strong><br><strong>Reference Manual</strong><br><small>Version 2.15.3</small></p>
<br><a href="javascript:openAllFlips()">Expand All</a><br><a href="javascript:closeAllFlips()">Contract All</a><p><small><strong>Table of Contents</strong></small></p>
<ul class="flipMenu">
<li title="kernel (App)"><a href="kernel_app.html">kernel (App)
</a></li>
<li id="no" title="application " expanded="false">application<ul>
<li><a href="application.html">
Top of manual page
</a></li>
<li title="get_all_env-0"><a href="application.html#get_all_env-0">get_all_env/0</a></li>
<li title="get_all_env-1"><a href="application.html#get_all_env-1">get_all_env/1</a></li>
<li title="get_all_key-0"><a href="application.html#get_all_key-0">get_all_key/0</a></li>
<li title="get_all_key-1"><a href="application.html#get_all_key-1">get_all_key/1</a></li>
<li title="get_application-0"><a href="application.html#get_application-0">get_application/0</a></li>
<li title="get_application-1"><a href="application.html#get_application-1">get_application/1</a></li>
<li title="get_env-1"><a href="application.html#get_env-1">get_env/1</a></li>
<li title="get_env-2"><a href="application.html#get_env-2">get_env/2</a></li>
<li title="get_key-1"><a href="application.html#get_key-1">get_key/1</a></li>
<li title="get_key-2"><a href="application.html#get_key-2">get_key/2</a></li>
<li title="load-1"><a href="application.html#load-1">load/1</a></li>
<li title="load-2"><a href="application.html#load-2">load/2</a></li>
<li title="loaded_applications-0"><a href="application.html#loaded_applications-0">loaded_applications/0</a></li>
<li title="permit-2"><a href="application.html#permit-2">permit/2</a></li>
<li title="set_env-3"><a href="application.html#set_env-3">set_env/3</a></li>
<li title="set_env-4"><a href="application.html#set_env-4">set_env/4</a></li>
<li title="start-1"><a href="application.html#start-1">start/1</a></li>
<li title="start-2"><a href="application.html#start-2">start/2</a></li>
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<li title="stop-1"><a href="application.html#stop-1">stop/1</a></li>
<li title="takeover-2"><a href="application.html#takeover-2">takeover/2</a></li>
<li title="unload-1"><a href="application.html#unload-1">unload/1</a></li>
<li title="unset_env-2"><a href="application.html#unset_env-2">unset_env/2</a></li>
<li title="unset_env-3"><a href="application.html#unset_env-3">unset_env/3</a></li>
<li title="which_applications-0"><a href="application.html#which_applications-0">which_applications/0</a></li>
<li title="which_applications-1"><a href="application.html#which_applications-1">which_applications/1</a></li>
<li title="Module:start-2"><a href="application.html#Module:start-2">Module:start/2</a></li>
<li title="Module:start_phase-3"><a href="application.html#Module:start_phase-3">Module:start_phase/3</a></li>
<li title="Module:prep_stop-1"><a href="application.html#Module:prep_stop-1">Module:prep_stop/1</a></li>
<li title="Module:stop-1"><a href="application.html#Module:stop-1">Module:stop/1</a></li>
<li title="Module:config_change-3"><a href="application.html#Module:config_change-3">Module:config_change/3</a></li>
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<li id="no" title="auth " expanded="false">auth<ul>
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<li title="is_auth-1"><a href="auth.html#is_auth-1">is_auth/1</a></li>
<li title="cookie-0"><a href="auth.html#cookie-0">cookie/0</a></li>
<li title="cookie-1"><a href="auth.html#cookie-1">cookie/1</a></li>
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<li title="node_cookie-2"><a href="auth.html#node_cookie-2">node_cookie/2</a></li>
</ul>
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<li id="no" title="code " expanded="false">code<ul>
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<li title="set_path-1"><a href="code.html#set_path-1">set_path/1</a></li>
<li title="get_path-0"><a href="code.html#get_path-0">get_path/0</a></li>
<li title="add_path-1"><a href="code.html#add_path-1">add_path/1</a></li>
<li title="add_pathz-1"><a href="code.html#add_pathz-1">add_pathz/1</a></li>
<li title="add_patha-1"><a href="code.html#add_patha-1">add_patha/1</a></li>
<li title="add_paths-1"><a href="code.html#add_paths-1">add_paths/1</a></li>
<li title="add_pathsz-1"><a href="code.html#add_pathsz-1">add_pathsz/1</a></li>
<li title="add_pathsa-1"><a href="code.html#add_pathsa-1">add_pathsa/1</a></li>
<li title="del_path-1"><a href="code.html#del_path-1">del_path/1</a></li>
<li title="replace_path-2"><a href="code.html#replace_path-2">replace_path/2</a></li>
<li title="load_file-1"><a href="code.html#load_file-1">load_file/1</a></li>
<li title="load_abs-1"><a href="code.html#load_abs-1">load_abs/1</a></li>
<li title="ensure_loaded-1"><a href="code.html#ensure_loaded-1">ensure_loaded/1</a></li>
<li title="load_binary-3"><a href="code.html#load_binary-3">load_binary/3</a></li>
<li title="delete-1"><a href="code.html#delete-1">delete/1</a></li>
<li title="purge-1"><a href="code.html#purge-1">purge/1</a></li>
<li title="soft_purge-1"><a href="code.html#soft_purge-1">soft_purge/1</a></li>
<li title="is_loaded-1"><a href="code.html#is_loaded-1">is_loaded/1</a></li>
<li title="all_loaded-0"><a href="code.html#all_loaded-0">all_loaded/0</a></li>
<li title="which-1"><a href="code.html#which-1">which/1</a></li>
<li title="get_object_code-1"><a href="code.html#get_object_code-1">get_object_code/1</a></li>
<li title="root_dir-0"><a href="code.html#root_dir-0">root_dir/0</a></li>
<li title="lib_dir-0"><a href="code.html#lib_dir-0">lib_dir/0</a></li>
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<li title="lib_dir-2"><a href="code.html#lib_dir-2">lib_dir/2</a></li>
<li title="compiler_dir-0"><a href="code.html#compiler_dir-0">compiler_dir/0</a></li>
<li title="priv_dir-1"><a href="code.html#priv_dir-1">priv_dir/1</a></li>
<li title="objfile_extension-0"><a href="code.html#objfile_extension-0">objfile_extension/0</a></li>
<li title="stick_dir-1"><a href="code.html#stick_dir-1">stick_dir/1</a></li>
<li title="unstick_dir-1"><a href="code.html#unstick_dir-1">unstick_dir/1</a></li>
<li title="is_sticky-1"><a href="code.html#is_sticky-1">is_sticky/1</a></li>
<li title="rehash-0"><a href="code.html#rehash-0">rehash/0</a></li>
<li title="where_is_file-1"><a href="code.html#where_is_file-1">where_is_file/1</a></li>
<li title="clash-0"><a href="code.html#clash-0">clash/0</a></li>
<li title="is_module_native-1"><a href="code.html#is_module_native-1">is_module_native/1</a></li>
</ul>
</li>
<li id="no" title="disk_log " expanded="false">disk_log<ul>
<li><a href="disk_log.html">
Top of manual page
</a></li>
<li title="accessible_logs-0"><a href="disk_log.html#accessible_logs-0">accessible_logs/0</a></li>
<li title="alog-2"><a href="disk_log.html#alog-2">alog/2</a></li>
<li title="balog-2"><a href="disk_log.html#balog-2">balog/2</a></li>
<li title="alog_terms-2"><a href="disk_log.html#alog_terms-2">alog_terms/2</a></li>
<li title="balog_terms-2"><a href="disk_log.html#balog_terms-2">balog_terms/2</a></li>
<li title="block-1"><a href="disk_log.html#block-1">block/1</a></li>
<li title="block-2"><a href="disk_log.html#block-2">block/2</a></li>
<li title="change_header-2"><a href="disk_log.html#change_header-2">change_header/2</a></li>
<li title="change_notify-3"><a href="disk_log.html#change_notify-3">change_notify/3</a></li>
<li title="change_size-2"><a href="disk_log.html#change_size-2">change_size/2</a></li>
<li title="chunk-2"><a href="disk_log.html#chunk-2">chunk/2</a></li>
<li title="chunk-3"><a href="disk_log.html#chunk-3">chunk/3</a></li>
<li title="bchunk-2"><a href="disk_log.html#bchunk-2">bchunk/2</a></li>
<li title="bchunk-3"><a href="disk_log.html#bchunk-3">bchunk/3</a></li>
<li title="chunk_info-1"><a href="disk_log.html#chunk_info-1">chunk_info/1</a></li>
<li title="chunk_step-3"><a href="disk_log.html#chunk_step-3">chunk_step/3</a></li>
<li title="close-1"><a href="disk_log.html#close-1">close/1</a></li>
<li title="format_error-1"><a href="disk_log.html#format_error-1">format_error/1</a></li>
<li title="inc_wrap_file-1"><a href="disk_log.html#inc_wrap_file-1">inc_wrap_file/1</a></li>
<li title="info-1"><a href="disk_log.html#info-1">info/1</a></li>
<li title="lclose-1"><a href="disk_log.html#lclose-1">lclose/1</a></li>
<li title="lclose-2"><a href="disk_log.html#lclose-2">lclose/2</a></li>
<li title="log-2"><a href="disk_log.html#log-2">log/2</a></li>
<li title="blog-2"><a href="disk_log.html#blog-2">blog/2</a></li>
<li title="log_terms-2"><a href="disk_log.html#log_terms-2">log_terms/2</a></li>
<li title="blog_terms-2"><a href="disk_log.html#blog_terms-2">blog_terms/2</a></li>
<li title="open-1"><a href="disk_log.html#open-1">open/1</a></li>
<li title="pid2name-1"><a href="disk_log.html#pid2name-1">pid2name/1</a></li>
<li title="reopen-2"><a href="disk_log.html#reopen-2">reopen/2</a></li>
<li title="reopen-3"><a href="disk_log.html#reopen-3">reopen/3</a></li>
<li title="breopen-3"><a href="disk_log.html#breopen-3">breopen/3</a></li>
<li title="sync-1"><a href="disk_log.html#sync-1">sync/1</a></li>
<li title="truncate-1"><a href="disk_log.html#truncate-1">truncate/1</a></li>
<li title="truncate-2"><a href="disk_log.html#truncate-2">truncate/2</a></li>
<li title="btruncate-2"><a href="disk_log.html#btruncate-2">btruncate/2</a></li>
<li title="unblock-1"><a href="disk_log.html#unblock-1">unblock/1</a></li>
</ul>
</li>
<li id="no" title="erl_boot_server " expanded="false">erl_boot_server<ul>
<li><a href="erl_boot_server.html">
Top of manual page
</a></li>
<li title="start-1"><a href="erl_boot_server.html#start-1">start/1</a></li>
<li title="start_link-1"><a href="erl_boot_server.html#start_link-1">start_link/1</a></li>
<li title="add_slave-1"><a href="erl_boot_server.html#add_slave-1">add_slave/1</a></li>
<li title="delete_slave-1"><a href="erl_boot_server.html#delete_slave-1">delete_slave/1</a></li>
<li title="which_slaves-0"><a href="erl_boot_server.html#which_slaves-0">which_slaves/0</a></li>
</ul>
</li>
<li id="no" title="erl_ddll " expanded="false">erl_ddll<ul>
<li><a href="erl_ddll.html">
Top of manual page
</a></li>
<li title="demonitor-1"><a href="erl_ddll.html#demonitor-1">demonitor/1</a></li>
<li title="info-0"><a href="erl_ddll.html#info-0">info/0</a></li>
<li title="info-1"><a href="erl_ddll.html#info-1">info/1</a></li>
<li title="info-2"><a href="erl_ddll.html#info-2">info/2</a></li>
<li title="load-2"><a href="erl_ddll.html#load-2">load/2</a></li>
<li title="load_driver-2"><a href="erl_ddll.html#load_driver-2">load_driver/2</a></li>
<li title="monitor-2"><a href="erl_ddll.html#monitor-2">monitor/2</a></li>
<li title="reload-2"><a href="erl_ddll.html#reload-2">reload/2</a></li>
<li title="reload_driver-2"><a href="erl_ddll.html#reload_driver-2">reload_driver/2</a></li>
<li title="try_load-3"><a href="erl_ddll.html#try_load-3">try_load/3</a></li>
<li title="try_unload-2"><a href="erl_ddll.html#try_unload-2">try_unload/2</a></li>
<li title="unload-1"><a href="erl_ddll.html#unload-1">unload/1</a></li>
<li title="unload_driver-1"><a href="erl_ddll.html#unload_driver-1">unload_driver/1</a></li>
<li title="loaded_drivers-0"><a href="erl_ddll.html#loaded_drivers-0">loaded_drivers/0</a></li>
<li title="format_error-1"><a href="erl_ddll.html#format_error-1">format_error/1</a></li>
</ul>
</li>
<li title="erl_prim_loader"><a href="erl_prim_loader.html">erl_prim_loader</a></li>
<li title="erlang"><a href="erlang.html">erlang</a></li>
<li id="no" title="error_handler " expanded="false">error_handler<ul>
<li><a href="error_handler.html">
Top of manual page
</a></li>
<li title="undefined_function-3"><a href="error_handler.html#undefined_function-3">undefined_function/3</a></li>
<li title="undefined_lambda-3"><a href="error_handler.html#undefined_lambda-3">undefined_lambda/3</a></li>
</ul>
</li>
<li id="no" title="error_logger " expanded="false">error_logger<ul>
<li><a href="error_logger.html">
Top of manual page
</a></li>
<li title="error_msg-1"><a href="error_logger.html#error_msg-1">error_msg/1</a></li>
<li title="error_msg-2"><a href="error_logger.html#error_msg-2">error_msg/2</a></li>
<li title="format-2"><a href="error_logger.html#format-2">format/2</a></li>
<li title="error_report-1"><a href="error_logger.html#error_report-1">error_report/1</a></li>
<li title="error_report-2"><a href="error_logger.html#error_report-2">error_report/2</a></li>
<li title="warning_map-0"><a href="error_logger.html#warning_map-0">warning_map/0</a></li>
<li title="warning_msg-1"><a href="error_logger.html#warning_msg-1">warning_msg/1</a></li>
<li title="warning_msg-2"><a href="error_logger.html#warning_msg-2">warning_msg/2</a></li>
<li title="warning_report-1"><a href="error_logger.html#warning_report-1">warning_report/1</a></li>
<li title="warning_report-2"><a href="error_logger.html#warning_report-2">warning_report/2</a></li>
<li title="info_msg-1"><a href="error_logger.html#info_msg-1">info_msg/1</a></li>
<li title="info_msg-2"><a href="error_logger.html#info_msg-2">info_msg/2</a></li>
<li title="info_report-1"><a href="error_logger.html#info_report-1">info_report/1</a></li>
<li title="info_report-2"><a href="error_logger.html#info_report-2">info_report/2</a></li>
<li title="add_report_handler-1"><a href="error_logger.html#add_report_handler-1">add_report_handler/1</a></li>
<li title="add_report_handler-2"><a href="error_logger.html#add_report_handler-2">add_report_handler/2</a></li>
<li title="delete_report_handler-1"><a href="error_logger.html#delete_report_handler-1">delete_report_handler/1</a></li>
<li title="tty-1"><a href="error_logger.html#tty-1">tty/1</a></li>
<li title="logfile-1"><a href="error_logger.html#logfile-1">logfile/1</a></li>
</ul>
</li>
<li id="no" title="file " expanded="false">file<ul>
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<li title="advise-4"><a href="file.html#advise-4">advise/4</a></li>
<li title="change_group-2"><a href="file.html#change_group-2">change_group/2</a></li>
<li title="change_mode-2"><a href="file.html#change_mode-2">change_mode/2</a></li>
<li title="change_owner-2"><a href="file.html#change_owner-2">change_owner/2</a></li>
<li title="change_owner-3"><a href="file.html#change_owner-3">change_owner/3</a></li>
<li title="change_time-2"><a href="file.html#change_time-2">change_time/2</a></li>
<li title="change_time-3"><a href="file.html#change_time-3">change_time/3</a></li>
<li title="close-1"><a href="file.html#close-1">close/1</a></li>
<li title="consult-1"><a href="file.html#consult-1">consult/1</a></li>
<li title="copy-2"><a href="file.html#copy-2">copy/2</a></li>
<li title="copy-3"><a href="file.html#copy-3">copy/3</a></li>
<li title="del_dir-1"><a href="file.html#del_dir-1">del_dir/1</a></li>
<li title="delete-1"><a href="file.html#delete-1">delete/1</a></li>
<li title="eval-1"><a href="file.html#eval-1">eval/1</a></li>
<li title="eval-2"><a href="file.html#eval-2">eval/2</a></li>
<li title="file_info-1"><a href="file.html#file_info-1">file_info/1</a></li>
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<li title="get_cwd-0"><a href="file.html#get_cwd-0">get_cwd/0</a></li>
<li title="get_cwd-1"><a href="file.html#get_cwd-1">get_cwd/1</a></li>
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<li title="make_link-2"><a href="file.html#make_link-2">make_link/2</a></li>
<li title="make_symlink-2"><a href="file.html#make_symlink-2">make_symlink/2</a></li>
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<li title="open-2"><a href="file.html#open-2">open/2</a></li>
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<!-- refpage --><center><h1>global_group</h1></center>
<h3>MODULE</h3>
<div class="REFBODY">global_group</div>
<h3>MODULE SUMMARY</h3>
<div class="REFBODY">Grouping Nodes to Global Name Registration Groups</div>
<h3>DESCRIPTION</h3>
<div class="REFBODY"><p>
<p>The global group function makes it possible to group the nodes
in a system into partitions, each partition having its own global
name space, refer to <span class="code">global(3)</span>. These partitions are
called global groups.</p>
<p>The main advantage of dividing systems to global groups is that
the background load decreases while the number of nodes to be
updated is reduced when manipulating globally registered names.</p>
<p>The Kernel configuration parameter <span class="code">global_groups</span> defines
the global groups (see also
<span class="bold_code"><a href="kernel_app.html">kernel(6)</a></span>,
<span class="bold_code"><a href="config.html">config(4)</a></span>:</p>
<div class="example"><pre>
{global_groups, [GroupTuple :: group_tuple()]}</pre></div>
<p>For the processes and nodes to run smoothly using the global
group functionality, the following criteria must be met:</p>
<ul>
<li>
<p>An instance of the global group server, <span class="code">global_group</span>,
must be running on each node. The processes are automatically
started and synchronized when a node is started.</p>
</li>
<li>
<p>All involved nodes must agree on the global group definition,
or the behavior of the system is undefined.</p>
</li>
<li>
<p><strong>All</strong> nodes in the system should belong to exactly
one global group.</p>
</li>
</ul>
<p>In the following description, a <strong>group node</strong> is a node
belonging to the same global group as the local node.</p>
</p></div>
<h3>DATA TYPES</h3>
<p>
<span class="bold_code"><a name="type-group_tuple">group_tuple()</a> = {GroupName :: <span class="bold_code"><a href="#type-group_name">group_name()</a></span>, [node()]}<br> | {GroupName :: <span class="bold_code"><a href="#type-group_name">group_name()</a></span>,<br> PublishType :: <span class="bold_code"><a href="#type-publish_type">publish_type()</a></span>,<br> [node()]}</span><br></p>
<div class="REFBODY"><p>
<p>A <span class="code">GroupTuple</span> without <span class="code">PublishType</span> is the same as a
<span class="code">GroupTuple</span> with <span class="code">PublishType == normal</span>.</p>
</p></div>
<p>
<span class="bold_code"><a name="type-group_name">group_name()</a> = atom()</span><br></p>
<p>
<span class="bold_code"><a name="type-publish_type">publish_type()</a> = hidden | normal</span><br></p>
<div class="REFBODY"><p>
<p>A node started with the command line flag <span class="code">-hidden</span>, see
<span class="bold_code"><a href="javascript:erlhref('../../../../doc/../','erts','erl.html');">erl(1)</a></span>, is said to be a
<strong>hidden</strong> node. A hidden node will establish hidden
connections to nodes not part of the same global group, but
normal (visible) connections to nodes part of the same global
group.</p>
<p>A global group defined with <span class="code">PublishType == hidden</span>, is
said to be a hidden global group. All nodes in a hidden global
group are hidden nodes, regardless if they are started with
the <span class="code">-hidden</span> command line flag or not.</p>
</p></div>
<p>
<span class="bold_code"><a name="type-name">name()</a> = atom()</span><br></p>
<div class="REFBODY"><p><p>A registered name.</p></p></div>
<p>
<span class="bold_code"><a name="type-where">where()</a> = {node, node()} | {group, <span class="bold_code"><a href="#type-group_name">group_name()</a></span>}</span><br></p>
<h3>EXPORTS</h3>
<p><a name="global_groups-0"></a><span class="bold_code">global_groups() -> {GroupName, GroupNames} | undefined</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">GroupName = <span class="bold_code"><a href="#type-group_name">group_name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">GroupNames = [GroupName]</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns a tuple containing the name of the global group
the local node belongs to, and the list of all other known
group names. Returns <span class="code">undefined</span> if no global groups are
defined.</p>
</p></div>
<p><a name="info-0"></a><span class="bold_code">info() -> [info_item()]</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">info_item() = {state, State :: sync_state()}<br> | {own_group_name, GroupName :: <span class="bold_code"><a href="#type-group_name">group_name()</a></span>}<br> | {own_group_nodes, Nodes :: [node()]}<br> | {synched_nodes, Nodes :: [node()]}<br> | {sync_error, Nodes :: [node()]}<br> | {no_contact, Nodes :: [node()]}<br> | {other_groups, Groups :: [<span class="bold_code"><a href="#type-group_tuple">group_tuple()</a></span>]}<br> | {monitoring, Pids :: [pid()]}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">sync_state() = no_conf | synced</span><br>
</div>
</div></p>
<div class="REFBODY"><p>
<p>Returns a list containing information about the global
groups. Each element of the list is a tuple. The order of
the tuples is not defined.</p>
<dl>
<dt><strong><span class="code">{state, State}</span></strong></dt>
<dd>
<p>If the local node is part of a global group,
<span class="code">State == synced</span>. If no global groups are defined,
<span class="code">State == no_conf</span>.</p>
</dd>
<dt><strong><span class="code">{own_group_name, GroupName}</span></strong></dt>
<dd>
<p>The name (atom) of the group that the local node belongs
to.</p>
</dd>
<dt><strong><span class="code">{own_group_nodes, Nodes}</span></strong></dt>
<dd>
<p>A list of node names (atoms), the group nodes.</p>
</dd>
<dt><strong><span class="code">{synced_nodes, Nodes}</span></strong></dt>
<dd>
<p>A list of node names, the group nodes currently
synchronized with the local node.</p>
</dd>
<dt><strong><span class="code">{sync_error, Nodes}</span></strong></dt>
<dd>
<p>A list of node names, the group nodes with which
the local node has failed to synchronize.</p>
</dd>
<dt><strong><span class="code">{no_contact, Nodes}</span></strong></dt>
<dd>
<p>A list of node names, the group nodes to which there are
currently no connections.</p>
</dd>
<dt><strong><span class="code">{other_groups, Groups}</span></strong></dt>
<dd>
<p><span class="code">Groups</span> is a list of tuples
<span class="code">{GroupName, Nodes}</span>, specifying the name and nodes
of the other global groups.</p>
</dd>
<dt><strong><span class="code">{monitoring, Pids}</span></strong></dt>
<dd>
<p>A list of pids, specifying the processes which have
subscribed to <span class="code">nodeup</span> and <span class="code">nodedown</span> messages.</p>
</dd>
</dl>
</p></div>
<p><a name="monitor_nodes-1"></a><span class="bold_code">monitor_nodes(Flag) -> ok</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Flag = boolean()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Depending on <span class="code">Flag</span>, the calling process starts
subscribing (<span class="code">Flag == true</span>) or stops subscribing
(<span class="code">Flag == false</span>) to node status change messages.</p>
<p>A process which has subscribed will receive the messages
<span class="code">{nodeup, Node}</span> and <span class="code">{nodedown, Node}</span> when a
group node connects or disconnects, respectively.</p>
</p></div>
<p><a name="own_nodes-0"></a><span class="bold_code">own_nodes() -> Nodes</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Nodes = [Node :: node()]</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns the names of all group nodes, regardless of their
current status.</p>
</p></div>
<p><a name="registered_names-1"></a><span class="bold_code">registered_names(Where) -> Names</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Where = <span class="bold_code"><a href="#type-where">where()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Names = [Name :: <span class="bold_code"><a href="#type-name">name()</a></span>]</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns a list of all names which are globally registered
on the specified node or in the specified global group.</p>
</p></div>
<p><a name="send-2"></a><span class="bold_code">send(Name, Msg) -> pid() | {badarg, {Name, Msg}}</span><br><a name="send-3"></a><span class="bold_code">send(Where, Name, Msg) -> pid() | {badarg, {Name, Msg}}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Where = <span class="bold_code"><a href="#type-where">where()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-name">name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Msg = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Searches for <span class="code">Name</span>, globally registered on
the specified node or in the specified global group, or --
if the <span class="code">Where</span> argument is not provided -- in any global
group. The global groups are searched in the order in which
they appear in the value of the <span class="code">global_groups</span>
configuration parameter.</p>
<p>If <span class="code">Name</span> is found, the message <span class="code">Msg</span> is sent to
the corresponding pid. The pid is also the return value of
the function. If the name is not found, the function returns
<span class="code">{badarg, {Name, Msg}}</span>.</p>
</p></div>
<p><a name="sync-0"></a><span class="bold_code">sync() -> ok</span><br></p>
<div class="REFBODY"><p>
<p>Synchronizes the group nodes, that is, the global name
servers on the group nodes. Also check the names globally
registered in the current global group and unregisters them
on any known node not part of the group.</p>
<p>If synchronization is not possible, an error report is sent
to the error logger (see also <span class="code">error_logger(3)</span>).</p>
<p>Failure:
<span class="code">{error, {'invalid global_groups definition', Bad}}</span> if
the <span class="code">global_groups</span> configuration parameter has an
invalid value <span class="code">Bad</span>.</p>
</p></div>
<p><a name="whereis_name-1"></a><span class="bold_code">whereis_name(Name) -> pid() | undefined</span><br><a name="whereis_name-2"></a><span class="bold_code">whereis_name(Where, Name) -> pid() | undefined</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Where = <span class="bold_code"><a href="#type-where">where()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-name">name()</a></span></span></div>
</div></p>
<div class="REFBODY"><p>
<p>Searches for <span class="code">Name</span>, globally registered on
the specified node or in the specified global group, or -- if
the <span class="code">Where</span> argument is not provided -- in any global
group. The global groups are searched in the order in which
they appear in the value of the <span class="code">global_groups</span>
configuration parameter.</p>
<p>If <span class="code">Name</span> is found, the corresponding pid is returned.
If the name is not found, the function returns
<span class="code">undefined</span>.</p>
</p></div>
<h3><a name="id126258">NOTE</a></h3>
<div class="REFBODY">
<p>In the situation where a node has lost its connections to other
nodes in its global group, but has connections to nodes in other
global groups, a request from another global group may produce an
incorrect or misleading result. For example, the isolated node may
not have accurate information about registered names in its
global group.</p>
<p>Note also that the <span class="code">send/2,3</span> function is not secure.</p>
<p>Distribution of applications is highly dependent of the global
group definitions. It is not recommended that an application is
distributed over several global groups of the obvious reason that
the registered names may be moved to another global group at
failover/takeover. There is nothing preventing doing this, but
the application code must in such case handle the situation.</p>
</div>
<h3><a name="id126286">SEE ALSO</a></h3>
<div class="REFBODY">
<p><span class="bold_code"><a href="javascript:erlhref('../../../../doc/../','erts','erl.html');">erl(1)</a></span>,
<span class="bold_code"><a href="global.html">global(3)</a></span></p>
</div>
</div>
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