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<img alt="Erlang logo" src="../../../../doc/erlang-logo.png"><br><small><a href="users_guide.html">User's Guide</a><br><a href="index.html">Reference Manual</a><br><a href="release_notes.html">Release Notes</a><br><a href="../pdf/stdlib-1.18.3.pdf">PDF</a><br><a href="../../../../doc/index.html">Top</a></small><p><strong>STDLIB</strong><br><strong>Reference Manual</strong><br><small>Version 1.18.3</small></p>
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<li title="STDLIB (App)"><a href="STDLIB_app.html">STDLIB (App)
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<li id="no" title="array " expanded="false">array<ul>
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<li title="default-1"><a href="array.html#default-1">default/1</a></li>
<li title="fix-1"><a href="array.html#fix-1">fix/1</a></li>
<li title="foldl-3"><a href="array.html#foldl-3">foldl/3</a></li>
<li title="foldr-3"><a href="array.html#foldr-3">foldr/3</a></li>
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<li title="from_list-2"><a href="array.html#from_list-2">from_list/2</a></li>
<li title="from_orddict-1"><a href="array.html#from_orddict-1">from_orddict/1</a></li>
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<li title="get-2"><a href="array.html#get-2">get/2</a></li>
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<li title="is_fix-1"><a href="array.html#is_fix-1">is_fix/1</a></li>
<li title="map-2"><a href="array.html#map-2">map/2</a></li>
<li title="new-0"><a href="array.html#new-0">new/0</a></li>
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<li title="set-3"><a href="array.html#set-3">set/3</a></li>
<li title="size-1"><a href="array.html#size-1">size/1</a></li>
<li title="sparse_foldl-3"><a href="array.html#sparse_foldl-3">sparse_foldl/3</a></li>
<li title="sparse_foldr-3"><a href="array.html#sparse_foldr-3">sparse_foldr/3</a></li>
<li title="sparse_map-2"><a href="array.html#sparse_map-2">sparse_map/2</a></li>
<li title="sparse_size-1"><a href="array.html#sparse_size-1">sparse_size/1</a></li>
<li title="sparse_to_list-1"><a href="array.html#sparse_to_list-1">sparse_to_list/1</a></li>
<li title="sparse_to_orddict-1"><a href="array.html#sparse_to_orddict-1">sparse_to_orddict/1</a></li>
<li title="to_list-1"><a href="array.html#to_list-1">to_list/1</a></li>
<li title="to_orddict-1"><a href="array.html#to_orddict-1">to_orddict/1</a></li>
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<li title="decode-1"><a href="base64.html#decode-1">decode/1</a></li>
<li title="decode_to_string-1"><a href="base64.html#decode_to_string-1">decode_to_string/1</a></li>
<li title="mime_decode-1"><a href="base64.html#mime_decode-1">mime_decode/1</a></li>
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<li title="chunks-2"><a href="beam_lib.html#chunks-2">chunks/2</a></li>
<li title="chunks-3"><a href="beam_lib.html#chunks-3">chunks/3</a></li>
<li title="version-1"><a href="beam_lib.html#version-1">version/1</a></li>
<li title="md5-1"><a href="beam_lib.html#md5-1">md5/1</a></li>
<li title="info-1"><a href="beam_lib.html#info-1">info/1</a></li>
<li title="cmp-2"><a href="beam_lib.html#cmp-2">cmp/2</a></li>
<li title="cmp_dirs-2"><a href="beam_lib.html#cmp_dirs-2">cmp_dirs/2</a></li>
<li title="diff_dirs-2"><a href="beam_lib.html#diff_dirs-2">diff_dirs/2</a></li>
<li title="strip-1"><a href="beam_lib.html#strip-1">strip/1</a></li>
<li title="strip_files-1"><a href="beam_lib.html#strip_files-1">strip_files/1</a></li>
<li title="strip_release-1"><a href="beam_lib.html#strip_release-1">strip_release/1</a></li>
<li title="format_error-1"><a href="beam_lib.html#format_error-1">format_error/1</a></li>
<li title="crypto_key_fun-1"><a href="beam_lib.html#crypto_key_fun-1">crypto_key_fun/1</a></li>
<li title="clear_crypto_key_fun-0"><a href="beam_lib.html#clear_crypto_key_fun-0">clear_crypto_key_fun/0</a></li>
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<li title="bin_to_list-2"><a href="binary.html#bin_to_list-2">bin_to_list/2</a></li>
<li title="bin_to_list-3"><a href="binary.html#bin_to_list-3">bin_to_list/3</a></li>
<li title="compile_pattern-1"><a href="binary.html#compile_pattern-1">compile_pattern/1</a></li>
<li title="copy-1"><a href="binary.html#copy-1">copy/1</a></li>
<li title="copy-2"><a href="binary.html#copy-2">copy/2</a></li>
<li title="decode_unsigned-1"><a href="binary.html#decode_unsigned-1">decode_unsigned/1</a></li>
<li title="decode_unsigned-2"><a href="binary.html#decode_unsigned-2">decode_unsigned/2</a></li>
<li title="encode_unsigned-1"><a href="binary.html#encode_unsigned-1">encode_unsigned/1</a></li>
<li title="encode_unsigned-2"><a href="binary.html#encode_unsigned-2">encode_unsigned/2</a></li>
<li title="first-1"><a href="binary.html#first-1">first/1</a></li>
<li title="last-1"><a href="binary.html#last-1">last/1</a></li>
<li title="list_to_bin-1"><a href="binary.html#list_to_bin-1">list_to_bin/1</a></li>
<li title="longest_common_prefix-1"><a href="binary.html#longest_common_prefix-1">longest_common_prefix/1</a></li>
<li title="longest_common_suffix-1"><a href="binary.html#longest_common_suffix-1">longest_common_suffix/1</a></li>
<li title="match-2"><a href="binary.html#match-2">match/2</a></li>
<li title="match-3"><a href="binary.html#match-3">match/3</a></li>
<li title="matches-2"><a href="binary.html#matches-2">matches/2</a></li>
<li title="matches-3"><a href="binary.html#matches-3">matches/3</a></li>
<li title="part-2"><a href="binary.html#part-2">part/2</a></li>
<li title="part-3"><a href="binary.html#part-3">part/3</a></li>
<li title="referenced_byte_size-1"><a href="binary.html#referenced_byte_size-1">referenced_byte_size/1</a></li>
<li title="replace-3"><a href="binary.html#replace-3">replace/3</a></li>
<li title="replace-4"><a href="binary.html#replace-4">replace/4</a></li>
<li title="split-2"><a href="binary.html#split-2">split/2</a></li>
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<li title="c-1"><a href="c.html#c-1">c/1</a></li>
<li title="c-2"><a href="c.html#c-2">c/2</a></li>
<li title="cd-1"><a href="c.html#cd-1">cd/1</a></li>
<li title="flush-0"><a href="c.html#flush-0">flush/0</a></li>
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<li title="i-0"><a href="c.html#i-0">i/0</a></li>
<li title="ni-0"><a href="c.html#ni-0">ni/0</a></li>
<li title="i-3"><a href="c.html#i-3">i/3</a></li>
<li title="l-1"><a href="c.html#l-1">l/1</a></li>
<li title="lc-1"><a href="c.html#lc-1">lc/1</a></li>
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<li title="ls-1"><a href="c.html#ls-1">ls/1</a></li>
<li title="m-0"><a href="c.html#m-0">m/0</a></li>
<li title="m-1"><a href="c.html#m-1">m/1</a></li>
<li title="memory-0"><a href="c.html#memory-0">memory/0</a></li>
<li title="memory-1"><a href="c.html#memory-1">memory/1</a></li>
<li title="nc-1"><a href="c.html#nc-1">nc/1</a></li>
<li title="nc-2"><a href="c.html#nc-2">nc/2</a></li>
<li title="nl-1"><a href="c.html#nl-1">nl/1</a></li>
<li title="pid-3"><a href="c.html#pid-3">pid/3</a></li>
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<li title="date_to_gregorian_days-1"><a href="calendar.html#date_to_gregorian_days-1">date_to_gregorian_days/1</a></li>
<li title="date_to_gregorian_days-3"><a href="calendar.html#date_to_gregorian_days-3">date_to_gregorian_days/3</a></li>
<li title="datetime_to_gregorian_seconds-1"><a href="calendar.html#datetime_to_gregorian_seconds-1">datetime_to_gregorian_seconds/1</a></li>
<li title="day_of_the_week-1"><a href="calendar.html#day_of_the_week-1">day_of_the_week/1</a></li>
<li title="day_of_the_week-3"><a href="calendar.html#day_of_the_week-3">day_of_the_week/3</a></li>
<li title="gregorian_days_to_date-1"><a href="calendar.html#gregorian_days_to_date-1">gregorian_days_to_date/1</a></li>
<li title="gregorian_seconds_to_datetime-1"><a href="calendar.html#gregorian_seconds_to_datetime-1">gregorian_seconds_to_datetime/1</a></li>
<li title="is_leap_year-1"><a href="calendar.html#is_leap_year-1">is_leap_year/1</a></li>
<li title="iso_week_number-0"><a href="calendar.html#iso_week_number-0">iso_week_number/0</a></li>
<li title="iso_week_number-1"><a href="calendar.html#iso_week_number-1">iso_week_number/1</a></li>
<li title="last_day_of_the_month-2"><a href="calendar.html#last_day_of_the_month-2">last_day_of_the_month/2</a></li>
<li title="local_time-0"><a href="calendar.html#local_time-0">local_time/0</a></li>
<li title="local_time_to_universal_time-1"><a href="calendar.html#local_time_to_universal_time-1">local_time_to_universal_time/1</a></li>
<li title="local_time_to_universal_time_dst-1"><a href="calendar.html#local_time_to_universal_time_dst-1">local_time_to_universal_time_dst/1</a></li>
<li title="now_to_local_time-1"><a href="calendar.html#now_to_local_time-1">now_to_local_time/1</a></li>
<li title="now_to_universal_time-1"><a href="calendar.html#now_to_universal_time-1">now_to_universal_time/1</a></li>
<li title="now_to_datetime-1"><a href="calendar.html#now_to_datetime-1">now_to_datetime/1</a></li>
<li title="seconds_to_daystime-1"><a href="calendar.html#seconds_to_daystime-1">seconds_to_daystime/1</a></li>
<li title="seconds_to_time-1"><a href="calendar.html#seconds_to_time-1">seconds_to_time/1</a></li>
<li title="time_difference-2"><a href="calendar.html#time_difference-2">time_difference/2</a></li>
<li title="time_to_seconds-1"><a href="calendar.html#time_to_seconds-1">time_to_seconds/1</a></li>
<li title="universal_time-0"><a href="calendar.html#universal_time-0">universal_time/0</a></li>
<li title="universal_time_to_local_time-1"><a href="calendar.html#universal_time_to_local_time-1">universal_time_to_local_time/1</a></li>
<li title="valid_date-1"><a href="calendar.html#valid_date-1">valid_date/1</a></li>
<li title="valid_date-3"><a href="calendar.html#valid_date-3">valid_date/3</a></li>
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<li title="delete-2"><a href="dets.html#delete-2">delete/2</a></li>
<li title="delete_all_objects-1"><a href="dets.html#delete_all_objects-1">delete_all_objects/1</a></li>
<li title="delete_object-2"><a href="dets.html#delete_object-2">delete_object/2</a></li>
<li title="first-1"><a href="dets.html#first-1">first/1</a></li>
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<li title="traverse-2"><a href="dets.html#traverse-2">traverse/2</a></li>
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<li title="erase-2"><a href="dict.html#erase-2">erase/2</a></li>
<li title="fetch-2"><a href="dict.html#fetch-2">fetch/2</a></li>
<li title="fetch_keys-1"><a href="dict.html#fetch_keys-1">fetch_keys/1</a></li>
<li title="filter-2"><a href="dict.html#filter-2">filter/2</a></li>
<li title="find-2"><a href="dict.html#find-2">find/2</a></li>
<li title="fold-3"><a href="dict.html#fold-3">fold/3</a></li>
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<li title="map-2"><a href="dict.html#map-2">map/2</a></li>
<li title="merge-3"><a href="dict.html#merge-3">merge/3</a></li>
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<li title="update-3"><a href="dict.html#update-3">update/3</a></li>
<li title="update-4"><a href="dict.html#update-4">update/4</a></li>
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<!-- refpage --><center><h1>gen_server</h1></center>
<h3>MODULE</h3>
<div class="REFBODY">gen_server</div>
<h3>MODULE SUMMARY</h3>
<div class="REFBODY">Generic Server Behaviour</div>
<h3>DESCRIPTION</h3>
<div class="REFBODY"><p>
<p>A behaviour module for implementing the server of a client-server
relation. A generic server process (gen_server) implemented using
this module will have a standard set of interface functions and
include functionality for tracing and error reporting. It will
also fit into an OTP supervision tree. Refer to
<span class="bold_code"><a href="javascript:erlhref('../../../../doc/../','doc/design_principles','gen_server_concepts.html');">OTP Design Principles</a></span> for more information.</p>
<p>A gen_server assumes all specific parts to be located in a
callback module exporting a pre-defined set of functions.
The relationship between the behaviour functions and the callback
functions can be illustrated as follows:</p>
<div class="example"><pre>
gen_server module Callback module
----------------- ---------------
gen_server:start_link -----> Module:init/1
gen_server:call
gen_server:multi_call -----> Module:handle_call/3
gen_server:cast
gen_server:abcast -----> Module:handle_cast/2
- -----> Module:handle_info/2
- -----> Module:terminate/2
- -----> Module:code_change/3 </pre></div>
<p>If a callback function fails or returns a bad value,
the gen_server will terminate.</p>
<p>A gen_server handles system messages as documented in
<span class="bold_code"><a href="sys.html">sys(3)</a></span>. The <span class="code">sys</span> module
can be used for debugging a gen_server.</p>
<p>Note that a gen_server does not trap exit signals automatically,
this must be explicitly initiated in the callback module.</p>
<p>Unless otherwise stated, all functions in this module fail if
the specified gen_server does not exist or if bad arguments are
given.</p>
<p>The gen_server process can go into hibernation
(see <span class="bold_code"><a href="javascript:erlhref('../../../../doc/../','erts','erlang.html#erlang:hibernate-3');">erlang(3)</a></span>) if a callback
function specifies <span class="code">'hibernate'</span> instead of a timeout value. This
might be useful if the server is expected to be idle for a long
time. However this feature should be used with care as hibernation
implies at least two garbage collections (when hibernating and
shortly after waking up) and is not something you'd want to do
between each call to a busy server.</p>
</p></div>
<h3>EXPORTS</h3>
<p><a name="start_link-3"><span class="bold_code">start_link(Module, Args, Options) -> Result</span></a><br><a name="start_link-4"><span class="bold_code">start_link(ServerName, Module, Args, Options) -> Result</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">ServerName = {local,Name} | {global,GlobalName}
| {via,Module,ViaName}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Name = atom()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> GlobalName = ViaName = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Module = atom()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Args = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Options = [Option]</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Option = {debug,Dbgs} | {timeout,Time} | {spawn_opt,SOpts}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Dbgs = [Dbg]</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Dbg = trace | log | statistics | {log_to_file,FileName} | {install,{Func,FuncState}}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> SOpts = [term()]</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Result = {ok,Pid} | ignore | {error,Error}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Pid = pid()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Error = {already_started,Pid} | term()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>Creates a gen_server process as part of a supervision tree.
The function should be called, directly or indirectly, by
the supervisor. It will, among other things, ensure that
the gen_server is linked to the supervisor.</p>
<p>The gen_server process calls <span class="code">Module:init/1</span> to
initialize. To ensure a synchronized start-up procedure,
<span class="code">start_link/3,4</span> does not return until
<span class="code">Module:init/1</span> has returned.</p>
<p>If <span class="code">ServerName={local,Name}</span> the gen_server is
registered locally as <span class="code">Name</span> using <span class="code">register/2</span>.
If <span class="code">ServerName={global,GlobalName}</span> the gen_server is
registered globally as <span class="code">GlobalName</span> using
<span class="code">global:register_name/2</span>. If no name is provided,
the gen_server is not registered.
If <span class="code">EventMgrName={via,Module,ViaName}</span>, the event manager will
register with the registry represented by <span class="code">Module</span>.
The <span class="code">Module</span> callback should export the functions
<span class="code">register_name/2</span>, <span class="code">unregister_name/1</span>,
<span class="code">whereis_name/1</span> and <span class="code">send/2</span>, which should behave like the
corresponding functions in <span class="code">global</span>. Thus,
<span class="code">{via,global,GlobalName}</span> is a valid reference.</p>
<p><span class="code">Module</span> is the name of the callback module.</p>
<p><span class="code">Args</span> is an arbitrary term which is passed as
the argument to <span class="code">Module:init/1</span>.</p>
<p>If the option <span class="code">{timeout,Time}</span> is present,
the gen_server is allowed to spend <span class="code">Time</span> milliseconds
initializing or it will be terminated and the start function
will return <span class="code">{error,timeout}</span>.
</p>
<p>If the option <span class="code">{debug,Dbgs}</span> is present,
the corresponding <span class="code">sys</span> function will be called for each
item in <span class="code">Dbgs</span>. See
<span class="bold_code"><a href="sys.html">sys(3)</a></span>.</p>
<p>If the option <span class="code">{spawn_opt,SOpts}</span> is present,
<span class="code">SOpts</span> will be passed as option list to
the <span class="code">spawn_opt</span> BIF which is used to spawn
the gen_server. See
<span class="bold_code"><a href="javascript:erlhref('../../../../doc/../','erts','erlang.html#spawn_opt-2');">erlang(3)</a></span>.</p>
<div class="note">
<div class="label">Note</div>
<div class="content"><p>
<p>Using the spawn option <span class="code">monitor</span> is currently not
allowed, but will cause the function to fail with reason
<span class="code">badarg</span>.</p>
</p></div>
</div>
<p>If the gen_server is successfully created and initialized
the function returns <span class="code">{ok,Pid}</span>, where <span class="code">Pid</span> is
the pid of the gen_server. If there already exists a process
with the specified <span class="code">ServerName</span> the function returns
<span class="code">{error,{already_started,Pid}}</span>, where <span class="code">Pid</span> is
the pid of that process.</p>
<p>If <span class="code">Module:init/1</span> fails with <span class="code">Reason</span>,
the function returns <span class="code">{error,Reason}</span>. If
<span class="code">Module:init/1</span> returns <span class="code">{stop,Reason}</span> or
<span class="code">ignore</span>, the process is terminated and the function
returns <span class="code">{error,Reason}</span> or <span class="code">ignore</span>, respectively.</p>
</p></div>
<p><a name="start-3"><span class="bold_code">start(Module, Args, Options) -> Result</span></a><br><a name="start-4"><span class="bold_code">start(ServerName, Module, Args, Options) -> Result</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">ServerName = {local,Name} | {global,GlobalName}
| {via,Module,ViaName}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Name = atom()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> GlobalName = ViaName = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Module = atom()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Args = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Options = [Option]</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Option = {debug,Dbgs} | {timeout,Time} | {spawn_opt,SOpts}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Dbgs = [Dbg]</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Dbg = trace | log | statistics | {log_to_file,FileName} | {install,{Func,FuncState}}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> SOpts = [term()]</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Result = {ok,Pid} | ignore | {error,Error}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Pid = pid()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Error = {already_started,Pid} | term()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>Creates a stand-alone gen_server process, i.e. a gen_server
which is not part of a supervision tree and thus has no
supervisor.</p>
<p>See <span class="bold_code"><a href="#start_link-3">start_link/3,4</a></span>
for a description of arguments and return values.</p>
</p></div>
<p><a name="call-2"><span class="bold_code">call(ServerRef, Request) -> Reply</span></a><br><a name="call-3"><span class="bold_code">call(ServerRef, Request, Timeout) -> Reply</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">ServerRef = Name | {Name,Node} | {global,GlobalName}
| {via,Module,ViaName} | pid()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Node = atom()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> GlobalName = ViaName = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Request = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Timeout = int()>0 | infinity</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Reply = term()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>Makes a synchronous call to the gen_server <span class="code">ServerRef</span>
by sending a request and waiting until a reply arrives or a
timeout occurs. The gen_server will call
<span class="code">Module:handle_call/3</span> to handle the request.</p>
<p><span class="code">ServerRef</span> can be:</p>
<ul>
<li>the pid,</li>
<li>
<span class="code">Name</span>, if the gen_server is locally registered,</li>
<li>
<span class="code">{Name,Node}</span>, if the gen_server is locally
registered at another node, or</li>
<li>
<span class="code">{global,GlobalName}</span>, if the gen_server is
globally registered.</li>
<li>
<span class="code">{via,Module,ViaName}</span>, if the gen_server is
registered through an alternative process registry.</li>
</ul>
<p><span class="code">Request</span> is an arbitrary term which is passed as one of
the arguments to <span class="code">Module:handle_call/3</span>.</p>
<p><span class="code">Timeout</span> is an integer greater than zero which
specifies how many milliseconds to wait for a reply, or
the atom <span class="code">infinity</span> to wait indefinitely. Default value
is 5000. If no reply is received within the specified time,
the function call fails. If the caller catches the failure
and continues running, and the server is just late with the reply,
it may arrive at any time later into the caller's message queue.
The caller must in this case be prepared for this
and discard any such garbage messages that are two element
tuples with a reference as the first element.</p>
<p>The return value <span class="code">Reply</span> is defined in the return value
of <span class="code">Module:handle_call/3</span>.</p>
<p>The call may fail for several reasons, including timeout and
the called gen_server dying before or during the call.</p>
<p>The ancient behaviour of sometimes consuming the server
exit message if the server died during the call while
linked to the client has been removed in OTP R12B/Erlang 5.6.</p>
</p></div>
<p><a name="multi_call-2"><span class="bold_code">multi_call(Name, Request) -> Result</span></a><br><a name="multi_call-3"><span class="bold_code">multi_call(Nodes, Name, Request) -> Result</span></a><br><a name="multi_call-4"><span class="bold_code">multi_call(Nodes, Name, Request, Timeout) -> Result</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">Nodes = [Node]</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Node = atom()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Name = atom()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Request = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Timeout = int()>=0 | infinity</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Result = {Replies,BadNodes}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Replies = [{Node,Reply}]</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Reply = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">BadNodes = [Node]</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>Makes a synchronous call to all gen_servers locally
registered as <span class="code">Name</span> at the specified nodes by first
sending a request to every node and then waiting for
the replies. The gen_servers will call
<span class="code">Module:handle_call/3</span> to handle the request.</p>
<p>The function returns a tuple <span class="code">{Replies,BadNodes}</span> where
<span class="code">Replies</span> is a list of <span class="code">{Node,Reply}</span> and
<span class="code">BadNodes</span> is a list of node that either did not exist,
or where the gen_server <span class="code">Name</span> did not exist or did not
reply.</p>
<p><span class="code">Nodes</span> is a list of node names to which the request
should be sent. Default value is the list of all known nodes
<span class="code">[node()|nodes()]</span>.</p>
<p><span class="code">Name</span> is the locally registered name of each
gen_server.</p>
<p><span class="code">Request</span> is an arbitrary term which is passed as one of
the arguments to <span class="code">Module:handle_call/3</span>.</p>
<p><span class="code">Timeout</span> is an integer greater than zero which
specifies how many milliseconds to wait for each reply, or
the atom <span class="code">infinity</span> to wait indefinitely. Default value
is <span class="code">infinity</span>. If no reply is received from a node within
the specified time, the node is added to <span class="code">BadNodes</span>.</p>
<p>When a reply <span class="code">Reply</span> is received from the gen_server at
a node <span class="code">Node</span>, <span class="code">{Node,Reply}</span> is added to
<span class="code">Replies</span>. <span class="code">Reply</span> is defined in the return value of
<span class="code">Module:handle_call/3</span>.</p>
<div class="warning">
<div class="label">Warning</div>
<div class="content"><p>
<p>If one of the nodes is not capable of process monitors,
for example C or Java nodes, and the gen_server is not started
when the requests are sent, but starts within 2 seconds,
this function waits the whole <span class="code">Timeout</span>,
which may be infinity.</p>
<p>This problem does not exist if all nodes are Erlang nodes.</p>
</p></div>
</div>
<p>To avoid that late answers (after the timeout) pollutes
the caller's message queue, a middleman process is used to
do the actual calls. Late answers will then be discarded
when they arrive to a terminated process.</p>
</p></div>
<p><a name="cast-2"><span class="bold_code">cast(ServerRef, Request) -> ok</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">ServerRef = Name | {Name,Node} | {global,GlobalName}
| {via,Module,ViaName} | pid()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Node = atom()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> GlobalName = ViaName = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Request = term()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>Sends an asynchronous request to the gen_server
<span class="code">ServerRef</span> and returns <span class="code">ok</span> immediately, ignoring
if the destination node or gen_server does not exist.
The gen_server will call <span class="code">Module:handle_cast/2</span> to
handle the request.</p>
<p>See <span class="bold_code"><a href="#call-2">call/2,3</a></span> for a
description of <span class="code">ServerRef</span>.</p>
<p><span class="code">Request</span> is an arbitrary term which is passed as one
of the arguments to <span class="code">Module:handle_cast/2</span>.</p>
</p></div>
<p><a name="abcast-2"><span class="bold_code">abcast(Name, Request) -> abcast</span></a><br><a name="abcast-3"><span class="bold_code">abcast(Nodes, Name, Request) -> abcast</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">Nodes = [Node]</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Node = atom()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Name = atom()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Request = term()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>Sends an asynchronous request to the gen_servers locally
registered as <span class="code">Name</span> at the specified nodes. The function
returns immediately and ignores nodes that do not exist, or
where the gen_server <span class="code">Name</span> does not exist.
The gen_servers will call <span class="code">Module:handle_cast/2</span> to
handle the request.</p>
<p>See
<span class="bold_code"><a href="#multi_call-2">multi_call/2,3,4</a></span>
for a description of the arguments.</p>
</p></div>
<p><a name="reply-2"><span class="bold_code">reply(Client, Reply) -> Result</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">Client - see below</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Reply = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Result = term()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>This function can be used by a gen_server to explicitly send
a reply to a client that called <span class="code">call/2,3</span> or
<span class="code">multi_call/2,3,4</span>, when the reply cannot be defined in
the return value of <span class="code">Module:handle_call/3</span>.</p>
<p><span class="code">Client</span> must be the <span class="code">From</span> argument provided to
the callback function. <span class="code">Reply</span> is an arbitrary term,
which will be given back to the client as the return value of
<span class="code">call/2,3</span> or <span class="code">multi_call/2,3,4</span>.</p>
<p>The return value <span class="code">Result</span> is not further defined, and
should always be ignored.</p>
</p></div>
<p><a name="enter_loop-3"><span class="bold_code">enter_loop(Module, Options, State)</span></a><br><a name="enter_loop-4"><span class="bold_code">enter_loop(Module, Options, State, ServerName)</span></a><br><a name="enter_loop-4"><span class="bold_code">enter_loop(Module, Options, State, Timeout)</span></a><br><a name="enter_loop-5"><span class="bold_code">enter_loop(Module, Options, State, ServerName, Timeout)</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">Module = atom()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Options = [Option]</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Option = {debug,Dbgs}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Dbgs = [Dbg]</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Dbg = trace | log | statistics</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> | {log_to_file,FileName} | {install,{Func,FuncState}}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">State = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">ServerName = {local,Name} | {global,GlobalName}
| {via,Module,ViaName}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Name = atom()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> GlobalName = ViaName = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Timeout = int() | infinity</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>Makes an existing process into a gen_server. Does not return,
instead the calling process will enter the gen_server receive
loop and become a gen_server process. The process
<strong>must</strong> have been started using one of the start
functions in <span class="code">proc_lib</span>, see
<span class="bold_code"><a href="proc_lib.html">proc_lib(3)</a></span>. The user is
responsible for any initialization of the process, including
registering a name for it.</p>
<p>This function is useful when a more complex initialization
procedure is needed than the gen_server behaviour provides.</p>
<p><span class="code">Module</span>, <span class="code">Options</span> and <span class="code">ServerName</span> have
the same meanings as when calling
<span class="bold_code"><a href="#start_link-3">gen_server:start[_link]/3,4</a></span>.
However, if <span class="code">ServerName</span> is specified, the process must
have been registered accordingly <strong>before</strong> this function
is called.</p>
<p><span class="code">State</span> and <span class="code">Timeout</span> have the same meanings as in
the return value of
<span class="bold_code"><a href="#Moduleinit">Module:init/1</a></span>.
Also, the callback module <span class="code">Module</span> does not need to
export an <span class="code">init/1</span> function. </p>
<p>Failure: If the calling process was not started by a
<span class="code">proc_lib</span> start function, or if it is not registered
according to <span class="code">ServerName</span>.</p>
</p></div>
<h3><a name="id185148">CALLBACK FUNCTIONS</a></h3>
<div class="REFBODY">
<p>The following functions
should be exported from a <span class="code">gen_server</span> callback module.</p>
</div>
<h3>EXPORTS</h3>
<p><a name="Module:init-1"><span class="bold_code">Module:init(Args) -> Result</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">Args = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Result = {ok,State} | {ok,State,Timeout} | {ok,State,hibernate}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> | {stop,Reason} | ignore</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> State = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Timeout = int()>=0 | infinity</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Reason = term()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<a name="Moduleinit"></a>
<p>Whenever a gen_server is started using
<span class="bold_code"><a href="#start-3">gen_server:start/3,4</a></span> or
<span class="bold_code"><a href="#start_link-3">gen_server:start_link/3,4</a></span>,
this function is called by the new process to initialize.</p>
<p><span class="code">Args</span> is the <span class="code">Args</span> argument provided to the start
function.</p>
<p>If the initialization is successful, the function should
return <span class="code">{ok,State}</span>, <span class="code">{ok,State,Timeout}</span> or <span class="code">{ok,State,hibernate}</span>, where
<span class="code">State</span> is the internal state of the gen_server.</p>
<p>If an integer timeout value is provided, a timeout will occur
unless a request or a message is received within
<span class="code">Timeout</span> milliseconds. A timeout is represented by
the atom <span class="code">timeout</span> which should be handled by
the <span class="code">handle_info/2</span> callback function. The atom
<span class="code">infinity</span> can be used to wait indefinitely, this is
the default value.</p>
<p>If <span class="code">hibernate</span> is specified instead of a timeout value, the process will go
into hibernation when waiting for the next message to arrive (by calling
<span class="bold_code"><a href="proc_lib.html#hibernate-3">proc_lib:hibernate/3</a></span>).</p>
<p>If something goes wrong during the initialization
the function should return <span class="code">{stop,Reason}</span> where
<span class="code">Reason</span> is any term, or <span class="code">ignore</span>.</p>
</p></div>
<p><a name="Module:handle_call-3"><span class="bold_code">Module:handle_call(Request, From, State) -> Result</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">Request = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">From = {pid(),Tag}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">State = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Result = {reply,Reply,NewState} | {reply,Reply,NewState,Timeout}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> | {reply,Reply,NewState,hibernate}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> | {noreply,NewState} | {noreply,NewState,Timeout}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> | {noreply,NewState,hibernate}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> | {stop,Reason,Reply,NewState} | {stop,Reason,NewState}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Reply = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> NewState = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Timeout = int()>=0 | infinity</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Reason = term()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>Whenever a gen_server receives a request sent using
<span class="bold_code"><a href="#call-2">gen_server:call/2,3</a></span> or
<span class="bold_code"><a href="#multi_call-2">gen_server:multi_call/2,3,4</a></span>,
this function is called to handle the request.</p>
<p><span class="code">Request</span> is the <span class="code">Request</span> argument provided
to <span class="code">call</span> or <span class="code">multi_call</span>.</p>
<p><span class="code">From</span> is a tuple <span class="code">{Pid,Tag}</span> where <span class="code">Pid</span> is
the pid of the client and <span class="code">Tag</span> is a unique tag.</p>
<p><span class="code">State</span> is the internal state of the gen_server.</p>
<p>If the function returns <span class="code">{reply,Reply,NewState}</span>,
<span class="code">{reply,Reply,NewState,Timeout}</span> or
<span class="code">{reply,Reply,NewState,hibernate}</span>, <span class="code">Reply</span> will be
given back to <span class="code">From</span> as the return value of
<span class="code">call/2,3</span> or included in the return value of
<span class="code">multi_call/2,3,4</span>. The gen_server then continues
executing with the possibly updated internal state
<span class="code">NewState</span>. See <span class="code">Module:init/1</span> for a description
of <span class="code">Timeout</span> and <span class="code">hibernate</span>.</p>
<p>If the functions returns <span class="code">{noreply,NewState}</span>,
<span class="code">{noreply,NewState,Timeout}</span> or <span class="code">{noreply,NewState,hibernate}</span>,
the gen_server will
continue executing with <span class="code">NewState</span>. Any reply to
<span class="code">From</span> must be given explicitly using
<span class="bold_code"><a href="#reply-2">gen_server:reply/2</a></span>.</p>
<p>If the function returns <span class="code">{stop,Reason,Reply,NewState}</span>,
<span class="code">Reply</span> will be given back to <span class="code">From</span>. If
the function returns <span class="code">{stop,Reason,NewState}</span>, any reply
to <span class="code">From</span> must be given explicitly using
<span class="code">gen_server:reply/2</span>. The gen_server will then call
<span class="code">Module:terminate(Reason,NewState)</span> and terminate.</p>
</p></div>
<p><a name="Module:handle_cast-2"><span class="bold_code">Module:handle_cast(Request, State) -> Result</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">Request = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">State = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Result = {noreply,NewState} | {noreply,NewState,Timeout}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> | {noreply,NewState,hibernate}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> | {stop,Reason,NewState}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> NewState = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Timeout = int()>=0 | infinity</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Reason = term()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>Whenever a gen_server receives a request sent using
<span class="bold_code"><a href="#cast-2">gen_server:cast/2</a></span> or
<span class="bold_code"><a href="#abcast-2">gen_server:abcast/2,3</a></span>,
this function is called to handle the request.</p>
<p>See <span class="code">Module:handle_call/3</span> for a description of
the arguments and possible return values.</p>
</p></div>
<p><a name="Module:handle_info-2"><span class="bold_code">Module:handle_info(Info, State) -> Result</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">Info = timeout | term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">State = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Result = {noreply,NewState} | {noreply,NewState,Timeout} </span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> | {noreply,NewState,hibernate}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> | {stop,Reason,NewState}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> NewState = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Timeout = int()>=0 | infinity</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Reason = normal | term()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>This function is called by a gen_server when a timeout
occurs or when it receives any other message than a
synchronous or asynchronous request (or a system message).</p>
<p><span class="code">Info</span> is either the atom <span class="code">timeout</span>, if a timeout
has occurred, or the received message.</p>
<p>See <span class="code">Module:handle_call/3</span> for a description of
the other arguments and possible return values.</p>
</p></div>
<p><a name="Module:terminate-2"><span class="bold_code">Module:terminate(Reason, State)</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">Reason = normal | shutdown | {shutdown,term()} | term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">State = term()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>This function is called by a gen_server when it is about to
terminate. It should be the opposite of <span class="code">Module:init/1</span>
and do any necessary cleaning up. When it returns,
the gen_server terminates with <span class="code">Reason</span>. The return
value is ignored.</p>
<p><span class="code">Reason</span> is a term denoting the stop reason and
<span class="code">State</span> is the internal state of the gen_server.</p>
<p><span class="code">Reason</span> depends on why the gen_server is terminating.
If it is because another callback function has returned a
stop tuple <span class="code">{stop,..}</span>, <span class="code">Reason</span> will have
the value specified in that tuple. If it is due to a failure,
<span class="code">Reason</span> is the error reason.</p>
<p>If the gen_server is part of a supervision tree and is
ordered by its supervisor to terminate, this function will be
called with <span class="code">Reason=shutdown</span> if the following
conditions apply:</p>
<ul>
<li>the gen_server has been set to trap exit signals, and</li>
<li>the shutdown strategy as defined in the supervisor's
child specification is an integer timeout value, not
<span class="code">brutal_kill</span>.</li>
</ul>
<p>Even if the gen_server is <strong>not</strong> part of a supervision tree,
this function will be called if it receives an <span class="code">'EXIT'</span>
message from its parent. <span class="code">Reason</span> will be the same as in
the <span class="code">'EXIT'</span> message.</p>
<p>Otherwise, the gen_server will be immediately terminated.</p>
<p>Note that for any other reason than <span class="code">normal</span>,
<span class="code">shutdown</span>, or <span class="code">{shutdown,Term}</span> the gen_server is
assumed to terminate due to an error and
an error report is issued using
<span class="bold_code"><a href="javascript:erlhref('../../../../doc/../','kernel','error_logger.html#format-2');">error_logger:format/2</a></span>.</p>
</p></div>
<p><a name="Module:code_change-3"><span class="bold_code">Module:code_change(OldVsn, State, Extra) -> {ok, NewState} | {error, Reason}</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">OldVsn = Vsn | {down, Vsn}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Vsn = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">State = NewState = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Extra = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Reason = term()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>This function is called by a gen_server when it should
update its internal state during a release upgrade/downgrade,
i.e. when the instruction <span class="code">{update,Module,Change,...}</span>
where <span class="code">Change={advanced,Extra}</span> is given in
the <span class="code">appup</span> file. See
<span class="bold_code"><a href="javascript:erlhref('../../../../doc/../','doc/design_principles','release_handling.html#instr');">OTP Design Principles</a></span>
for more information.</p>
<p>In the case of an upgrade, <span class="code">OldVsn</span> is <span class="code">Vsn</span>, and
in the case of a downgrade, <span class="code">OldVsn</span> is
<span class="code">{down,Vsn}</span>. <span class="code">Vsn</span> is defined by the <span class="code">vsn</span>
attribute(s) of the old version of the callback module
<span class="code">Module</span>. If no such attribute is defined, the version
is the checksum of the BEAM file.</p>
<p><span class="code">State</span> is the internal state of the gen_server.</p>
<p><span class="code">Extra</span> is passed as-is from the <span class="code">{advanced,Extra}</span>
part of the update instruction.</p>
<p>If successful, the function shall return the updated
internal state.</p>
<p>If the function returns <span class="code">{error,Reason}</span>, the ongoing
upgrade will fail and roll back to the old release.</p>
</p></div>
<p><a name="Module:format_status-2"><span class="bold_code">Module:format_status(Opt, [PDict, State]) -> Status</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">Opt = normal | terminate</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">PDict = [{Key, Value}]</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">State = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Status = term()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<div class="note">
<div class="label">Note</div>
<div class="content"><p>
<p>This callback is optional, so callback modules need not
export it. The gen_server module provides a default
implementation of this function that returns the callback
module state.</p>
</p></div>
</div>
<p>This function is called by a gen_server process when:</p>
<ul>
<li>One
of <span class="bold_code"><a href="sys.html#get_status-1">sys:get_status/1,2</a></span>
is invoked to get the gen_server status. <span class="code">Opt</span> is set
to the atom <span class="code">normal</span> for this case.</li>
<li>The gen_server terminates abnormally and logs an
error. <span class="code">Opt</span> is set to the atom <span class="code">terminate</span> for this
case.</li>
</ul>
<p>This function is useful for customising the form and
appearance of the gen_server status for these cases. A
callback module wishing to customise
the <span class="code">sys:get_status/1,2</span> return value as well as how
its status appears in termination error logs exports an
instance of <span class="code">format_status/2</span> that returns a term
describing the current status of the gen_server.</p>
<p><span class="code">PDict</span> is the current value of the gen_server's
process dictionary.</p>
<p><span class="code">State</span> is the internal state of the gen_server.</p>
<p>The function should return <span class="code">Status</span>, a term that
customises the details of the current state and status of
the gen_server. There are no restrictions on the
form <span class="code">Status</span> can take, but for
the <span class="code">sys:get_status/1,2</span> case (when <span class="code">Opt</span>
is <span class="code">normal</span>), the recommended form for
the <span class="code">Status</span> value is <span class="code">[{data, [{"State",
Term}]}]</span> where <span class="code">Term</span> provides relevant details of
the gen_server state. Following this recommendation isn't
required, but doing so will make the callback module status
consistent with the rest of the <span class="code">sys:get_status/1,2</span>
return value.</p>
<p>One use for this function is to return compact alternative
state representations to avoid having large state terms
printed in logfiles.</p>
</p></div>
<h3><a name="id186110">SEE ALSO</a></h3>
<div class="REFBODY">
<p><span class="bold_code"><a href="gen_event.html">gen_event(3)</a></span>,
<span class="bold_code"><a href="gen_fsm.html">gen_fsm(3)</a></span>,
<span class="bold_code"><a href="supervisor.html">supervisor(3)</a></span>,
<span class="bold_code"><a href="proc_lib.html">proc_lib(3)</a></span>,
<span class="bold_code"><a href="sys.html">sys(3)</a></span></p>
</div>
</div>
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<hr>
<p>Copyright © 1997-2012 Ericsson AB. All Rights Reserved.</p>
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