diff options
Diffstat (limited to 'lib/stdlib/doc/src')
68 files changed, 2258 insertions, 338 deletions
diff --git a/lib/stdlib/doc/src/Makefile b/lib/stdlib/doc/src/Makefile index 196c86748f..26602764a6 100644 --- a/lib/stdlib/doc/src/Makefile +++ b/lib/stdlib/doc/src/Makefile @@ -1,7 +1,7 @@ # # %CopyrightBegin% # -# Copyright Ericsson AB 1997-2015. All Rights Reserved. +# Copyright Ericsson AB 1997-2016. All Rights Reserved. # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. @@ -68,6 +68,7 @@ XML_REF3_FILES = \ gen_event.xml \ gen_fsm.xml \ gen_server.xml \ + gen_statem.xml \ io.xml \ io_lib.xml \ lib.xml \ diff --git a/lib/stdlib/doc/src/array.xml b/lib/stdlib/doc/src/array.xml index 0f33e2621c..bff98245bf 100644 --- a/lib/stdlib/doc/src/array.xml +++ b/lib/stdlib/doc/src/array.xml @@ -3,7 +3,7 @@ <erlref> <header> <copyright> - <year>2007</year><year>2014</year> + <year>2007</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/base64.xml b/lib/stdlib/doc/src/base64.xml index 276d28e174..7b82d7dd3d 100644 --- a/lib/stdlib/doc/src/base64.xml +++ b/lib/stdlib/doc/src/base64.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>2007</year><year>2013</year> + <year>2007</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/binary.xml b/lib/stdlib/doc/src/binary.xml index 2682198fe5..933157fc34 100644 --- a/lib/stdlib/doc/src/binary.xml +++ b/lib/stdlib/doc/src/binary.xml @@ -5,7 +5,7 @@ <header> <copyright> <year>2009</year> - <year>2014</year> + <year>2016</year> <holder>Ericsson AB, All Rights Reserved</holder> </copyright> <legalnotice> @@ -366,7 +366,7 @@ <code> 1> binary:matches(<<"abcde">>, - [<<"bcde">>,<<"bc">>>,<<"de">>],[]). + [<<"bcde">>,<<"bc">>,<<"de">>],[]). [{1,4}] </code> diff --git a/lib/stdlib/doc/src/book.xml b/lib/stdlib/doc/src/book.xml index 043f6cc19b..84ce3f0788 100644 --- a/lib/stdlib/doc/src/book.xml +++ b/lib/stdlib/doc/src/book.xml @@ -4,7 +4,7 @@ <book xmlns:xi="http://www.w3.org/2001/XInclude"> <header titlestyle="normal"> <copyright> - <year>1997</year><year>2013</year> + <year>1997</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/c.xml b/lib/stdlib/doc/src/c.xml index e5238fa7db..9b4a9489c0 100644 --- a/lib/stdlib/doc/src/c.xml +++ b/lib/stdlib/doc/src/c.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>1996</year><year>2013</year> + <year>1996</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/calendar.xml b/lib/stdlib/doc/src/calendar.xml index 853184dc0f..38bf55679e 100644 --- a/lib/stdlib/doc/src/calendar.xml +++ b/lib/stdlib/doc/src/calendar.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>1996</year><year>2013</year> + <year>1996</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/dets.xml b/lib/stdlib/doc/src/dets.xml index a0d3f95b6a..177c2ba508 100644 --- a/lib/stdlib/doc/src/dets.xml +++ b/lib/stdlib/doc/src/dets.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>1996</year><year>2013</year> + <year>1996</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> @@ -399,15 +399,40 @@ kept in RAM.</p> </item> <item> - <p><c>{safe_fixed,</c> SafeFixed<c>}</c>. If the table - is fixed, SafeFixed is a tuple <c>{FixedAtTime, [{Pid,RefCount}]}</c>. <c>FixedAtTime</c> is the time when + <p><c>{safe_fixed_monotonic_time, SafeFixed}</c>. If the table + is fixed, <c>SafeFixed</c> is a tuple <c>{FixedAtTime, [{Pid,RefCount}]}</c>. + <c>FixedAtTime</c> is the time when the table was first fixed, and <c>Pid</c> is the pid of the process that fixes the table <c>RefCount</c> times. There may be any number of processes in the list. If the table is not fixed, SafeFixed is the atom <c>false</c>.</p> + <p><c>FixedAtTime</c> will correspond to the result + returned by + <seealso marker="erts:erlang#monotonic_time/0">erlang:monotonic_time/0</seealso> + at the time of fixation. The usage of <c>safe_fixed_monotonic_time</c> is + <seealso marker="erts:time_correction#Time_Warp_Safe_Code">time warp + safe</seealso>.</p> </item> <item> - <p><c>{version, integer()</c>, the version of the format of + <p> + <c>{safe_fixed, SafeFixed}</c>. The same as + <c>{safe_fixed_monotonic_time, SafeFixed}</c> with the exception + of the format and value of <c>FixedAtTime</c>. + </p> + <p> + <c>FixedAtTime</c> will correspond to the result returned by + <seealso marker="erts:erlang#timestamp/0">erlang:timestamp/0</seealso> + at the time of fixation. Note that when the system is using + single or multi + <seealso marker="erts:time_correction#Time_Warp_Modes">time warp + modes</seealso> this might produce strange results. This + since the usage of <c>safe_fixed</c> is not + <seealso marker="erts:time_correction#Time_Warp_Safe_Code">time warp + safe</seealso>. Time warp safe code need to use + <c>safe_fixed_monotonic_time</c> instead.</p> + </item> + <item> + <p><c>{version, integer()}</c>, the version of the format of the table.</p> </item> </list> diff --git a/lib/stdlib/doc/src/dict.xml b/lib/stdlib/doc/src/dict.xml index e10531caac..20bab99a9c 100644 --- a/lib/stdlib/doc/src/dict.xml +++ b/lib/stdlib/doc/src/dict.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>1996</year><year>2014</year> + <year>1996</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/digraph.xml b/lib/stdlib/doc/src/digraph.xml index 291be6c08b..1bb8eef247 100644 --- a/lib/stdlib/doc/src/digraph.xml +++ b/lib/stdlib/doc/src/digraph.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>1996</year><year>2014</year> + <year>1996</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> @@ -104,14 +104,12 @@ </datatype> <datatype> <name>edge()</name> - <desc><p><marker id="type-edge"/></p></desc> </datatype> <datatype> <name name="label"/> </datatype> <datatype> <name>vertex()</name> - <desc><p><marker id="type-vertex"/></p></desc> </datatype> </datatypes> <funcs> diff --git a/lib/stdlib/doc/src/digraph_utils.xml b/lib/stdlib/doc/src/digraph_utils.xml index 639069543c..e481711c50 100644 --- a/lib/stdlib/doc/src/digraph_utils.xml +++ b/lib/stdlib/doc/src/digraph_utils.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>2000</year><year>2013</year> + <year>2000</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> @@ -120,13 +120,6 @@ considering all edges undirected.</p> </description> - <datatypes> - <datatype> - <name>digraph()</name> - <desc><p><marker id="type-digraph"/> - A digraph as returned by <c>digraph:new/0,1</c>.</p></desc> - </datatype> - </datatypes> <funcs> <func> <name name="arborescence_root" arity="1"/> diff --git a/lib/stdlib/doc/src/epp.xml b/lib/stdlib/doc/src/epp.xml index 8c901f57ec..ac87f9c2b6 100644 --- a/lib/stdlib/doc/src/epp.xml +++ b/lib/stdlib/doc/src/epp.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>1996</year><year>2014</year> + <year>1996</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> @@ -102,6 +102,7 @@ <func> <name name="parse_erl_form" arity="1"/> <fsummary>Return the next Erlang form from the opened Erlang source file</fsummary> + <type name="warning_info"/> <desc> <p>Returns the next Erlang form from the opened Erlang source file. The tuple <c>{eof, <anno>Line</anno>}</c> is returned at end-of-file. The first diff --git a/lib/stdlib/doc/src/erl_anno.xml b/lib/stdlib/doc/src/erl_anno.xml index ddc8b8c765..9f775943c1 100644 --- a/lib/stdlib/doc/src/erl_anno.xml +++ b/lib/stdlib/doc/src/erl_anno.xml @@ -5,7 +5,7 @@ <header> <copyright> <year>2015</year> - <year>2015</year> + <year>2016</year> <holder>Ericsson AB, All Rights Reserved</holder> </copyright> <legalnotice> @@ -103,7 +103,7 @@ <datatypes> <datatype> <name>anno()</name> - <desc><p><marker id="type-anno"/>A collection of annotations.</p> + <desc><p>A collection of annotations.</p> </desc> </datatype> <datatype> diff --git a/lib/stdlib/doc/src/erl_eval.xml b/lib/stdlib/doc/src/erl_eval.xml index ba988e7ca2..d60b04b510 100644 --- a/lib/stdlib/doc/src/erl_eval.xml +++ b/lib/stdlib/doc/src/erl_eval.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>1996</year><year>2013</year> + <year>1996</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/erl_expand_records.xml b/lib/stdlib/doc/src/erl_expand_records.xml index 497b371434..93e464c733 100644 --- a/lib/stdlib/doc/src/erl_expand_records.xml +++ b/lib/stdlib/doc/src/erl_expand_records.xml @@ -5,7 +5,7 @@ <header> <copyright> <year>2005</year> - <year>2013</year> + <year>2016</year> <holder>Ericsson AB, All Rights Reserved</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/erl_id_trans.xml b/lib/stdlib/doc/src/erl_id_trans.xml index 30eb213493..153bd4148e 100644 --- a/lib/stdlib/doc/src/erl_id_trans.xml +++ b/lib/stdlib/doc/src/erl_id_trans.xml @@ -5,7 +5,7 @@ <header> <copyright> <year>1996</year> - <year>2013</year> + <year>2016</year> <holder>Ericsson AB, All Rights Reserved</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/erl_internal.xml b/lib/stdlib/doc/src/erl_internal.xml index e1ee50b424..940f8c5b40 100644 --- a/lib/stdlib/doc/src/erl_internal.xml +++ b/lib/stdlib/doc/src/erl_internal.xml @@ -5,7 +5,7 @@ <header> <copyright> <year>1996</year> - <year>2013</year> + <year>2016</year> <holder>Ericsson AB, All Rights Reserved</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/erl_lint.xml b/lib/stdlib/doc/src/erl_lint.xml index 318cb5ac19..3747b0f3c3 100644 --- a/lib/stdlib/doc/src/erl_lint.xml +++ b/lib/stdlib/doc/src/erl_lint.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>1996</year><year>2013</year> + <year>1996</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/erl_parse.xml b/lib/stdlib/doc/src/erl_parse.xml index 0938b5dec3..32fce16d68 100644 --- a/lib/stdlib/doc/src/erl_parse.xml +++ b/lib/stdlib/doc/src/erl_parse.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>1996</year><year>2015</year> + <year>1996</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> @@ -44,21 +44,29 @@ </description> <datatypes> <datatype> - <name name="abstract_clause"></name> - <desc><p>Parse tree for Erlang clause.</p> + <name>abstract_clause()</name> + <desc><p>Abstract form of an Erlang clause.</p> </desc> </datatype> <datatype> - <name name="abstract_expr"></name> - <desc><p>Parse tree for Erlang expression.</p> + <name>abstract_expr()</name> + <desc><p>Abstract form of an Erlang expression.</p> </desc> </datatype> <datatype> - <name name="abstract_form"></name> - <desc><p>Parse tree for Erlang form.</p> + <name>abstract_form()</name> + <desc><p>Abstract form of an Erlang form.</p> </desc> </datatype> <datatype> + <name>abstract_type()</name> + <desc><p>Abstract form of an Erlang type.</p> + </desc> + </datatype> + <datatype> + <name name="erl_parse_tree"></name> + </datatype> + <datatype> <name name="error_description"></name> </datatype> <datatype> @@ -180,7 +188,7 @@ <p>Converts the Erlang data structure <c><anno>Data</anno></c> into an abstract form of type <c><anno>AbsTerm</anno></c>.</p> <p>The <c><anno>Line</anno></c> option is the line that will - be assigned to each node of the abstract form.</p> + be assigned to each node of <c><anno>AbsTerm</anno></c>.</p> <p>The <c><anno>Encoding</anno></c> option is used for selecting which integer lists will be considered as strings. The default is to use the encoding returned by @@ -196,47 +204,53 @@ <func> <name name="map_anno" arity="2"/> <fsummary> - Map a function over the annotations of an abstract form + Map a function over the annotations of a <c>erl_parse</c> tree </fsummary> <desc> - <p>Modifies the abstract form <anno>Abstr</anno> by applying - <anno>Fun</anno> on every collection of annotations of the - abstract form. The abstract form is traversed in a - depth-first, left-to-right, fashion. + <p>Modifies the <c>erl_parse</c> tree <c><anno>Abstr</anno></c> + by applying <c><anno>Fun</anno></c> on each collection of + annotations of the nodes of the <c>erl_parse</c> tree. The + <c>erl_parse</c> tree is traversed in a depth-first, + left-to-right, fashion. </p> </desc> </func> <func> <name name="fold_anno" arity="3"/> <fsummary> - Fold a function over the annotations of an abstract form + Fold a function over the annotations of a <c>erl_parse</c> tree </fsummary> <desc> - <p>Updates an accumulator by applying <anno>Fun</anno> on - every collection of annotations of the abstract form - <anno>Abstr</anno>. The first call to <anno>Fun</anno> has - <anno>AccIn</anno> as argument, and the returned accumulator - <anno>AccOut</anno> is passed to the next call, and so on. - The final value of the accumulator is returned. The abstract - form is traversed in a depth-first, left-to-right, fashion. + <p>Updates an accumulator by applying <c><anno>Fun</anno></c> on + each collection of annotations of the <c>erl_parse</c> tree + <c><anno>Abstr</anno></c>. The first call to + <c><anno>Fun</anno></c> has <c><anno>AccIn</anno></c> as + argument, and the returned accumulator + <c><anno>AccOut</anno></c> is passed to the next call, and + so on. The final value of the accumulator is returned. The + <c>erl_parse</c> tree is traversed in a depth-first, left-to-right, + fashion. </p> </desc> </func> <func> <name name="mapfold_anno" arity="3"/> <fsummary> - Map and fold a function over the annotations of an abstract form + Map and fold a function over the annotations of a + <c>erl_parse</c> tree </fsummary> <desc> - <p>Modifies the abstract form <anno>Abstr</anno> by applying - <anno>Fun</anno> on every collection of annotations of the - abstract form, while at the same time updating an - accumulator. The first call to <anno>Fun</anno> has - <anno>AccIn</anno> as second argument, and the returned - accumulator <anno>AccOut</anno> is passed to the next call, - and so on. The modified abstract form as well as the the - final value of the accumulator is returned. The abstract - form is traversed in a depth-first, left-to-right, fashion. + <p>Modifies the <c>erl_parse</c> tree <c><anno>Abstr</anno></c> + by applying <c><anno>Fun</anno></c> on each collection of + annotations of the nodes of the <c>erl_parse</c> tree, while + at the same time updating an accumulator. The first call to + <c><anno>Fun</anno></c> has <c><anno>AccIn</anno></c> as + second argument, and the returned accumulator + <c><anno>AccOut</anno></c> is passed to the next call, and + so on. The modified <c>erl_parse</c> tree as well as the the + final value of the accumulator are returned. The + <c>erl_parse</c> tree is traversed in a depth-first, + left-to-right, fashion. </p> </desc> </func> @@ -246,12 +260,15 @@ Create new annotations </fsummary> <desc> - <p>Creates an abstract form from a term which has the same - structure as an abstract form, but <seealso - marker="erl_anno#type-location">locations</seealso> where the - abstract form has annotations. For each location, <seealso - marker="erl_anno#new/1"><c>erl_anno:new/1</c></seealso> is - called, and the annotations replace the location. + <p>Assumes that <c><anno>Term</anno></c> is a term with the same + structure as a <c>erl_parse</c> tree, but with <seealso + marker="erl_anno#type-location">locations</seealso> where a + <c>erl_parse</c> tree has collections of annotations. + Returns a <c>erl_parse</c> tree where each location <c>L</c> + has been replaced by the value returned by <seealso + marker="erl_anno#new/1"><c>erl_anno:new(L)</c></seealso>. + The term <c><anno>Term</anno></c> is traversed in a + depth-first, left-to-right, fashion. </p> </desc> </func> @@ -261,12 +278,14 @@ Return annotations as terms </fsummary> <desc> - <p>Assumes that <anno>Term</anno> is a term with the same - structure as an abstract form, but with terms, T say, on - those places where an abstract form has annotations. Returns - an abstract form where every term T has been replaced by the - value returned by calling <c>erl_anno:from_term(T)</c>. The - term <anno>Term</anno> is traversed in a depth-first, + <p>Assumes that <c><anno>Term</anno></c> is a term with the same + structure as a <c>erl_parse</c> tree, but with terms, + <c>T</c> say, where a <c>erl_parse</c> tree has collections + of annotations. Returns a <c>erl_parse</c> tree where each + term <c>T</c> has been replaced by the value returned by + <seealso marker="erl_anno#from_term/1"> + <c>erl_anno:from_term(T)</c></seealso>. The term + <c><anno>Term</anno></c> is traversed in a depth-first, left-to-right, fashion. </p> </desc> @@ -277,10 +296,13 @@ Return the representation of annotations </fsummary> <desc> - <p>Returns a term where every collection of annotations Anno of - <anno>Abstr</anno> has been replaced by the term returned by - calling <c>erl_anno:to_term(Anno)</c>. The abstract form is - traversed in a depth-first, left-to-right, fashion. + <p>Returns a term where each collection of annotations + <c>Anno</c> of the nodes of the <c>erl_parse</c> tree + <c><anno>Abstr</anno></c> has been replaced by the term + returned by <seealso marker="erl_anno#to_term/1"> + <c>erl_anno:to_term(Anno)</c></seealso>. The + <c>erl_parse</c> tree is traversed in a depth-first, + left-to-right, fashion. </p> </desc> </func> diff --git a/lib/stdlib/doc/src/erl_pp.xml b/lib/stdlib/doc/src/erl_pp.xml index 4b8a571c81..e96fd576ec 100644 --- a/lib/stdlib/doc/src/erl_pp.xml +++ b/lib/stdlib/doc/src/erl_pp.xml @@ -5,7 +5,7 @@ <header> <copyright> <year>1996</year> - <year>2013</year> + <year>2016</year> <holder>Ericsson AB, All Rights Reserved</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/erl_scan.xml b/lib/stdlib/doc/src/erl_scan.xml index 342f491dd0..ee0d6b6033 100644 --- a/lib/stdlib/doc/src/erl_scan.xml +++ b/lib/stdlib/doc/src/erl_scan.xml @@ -40,39 +40,15 @@ </description> <datatypes> <datatype> - <name name="attribute_info"></name> - </datatype> - <datatype> - <name name="attributes"></name> - </datatype> - <datatype> - <name name="attributes_data"></name> - </datatype> - <datatype> <name name="category"></name> </datatype> <datatype> - <name name="column"></name> - </datatype> - <datatype> <name name="error_description"></name> </datatype> <datatype> <name name="error_info"></name> </datatype> <datatype> - <name name="info_line"></name> - </datatype> - <datatype> - <name name="info_location"></name> - </datatype> - <datatype> - <name name="line"></name> - </datatype> - <datatype> - <name name="location"></name> - </datatype> - <datatype> <name name="option"></name> </datatype> <datatype> @@ -88,9 +64,6 @@ <name name="token"></name> </datatype> <datatype> - <name name="token_info"></name> - </datatype> - <datatype> <name name="tokens"></name> </datatype> <datatype> @@ -122,25 +95,23 @@ <anno>StartLocation</anno>, [])</c>.</p> <p><c><anno>StartLocation</anno></c> indicates the initial location when scanning starts. If <c><anno>StartLocation</anno></c> is a line, - <c>attributes()</c> as well as <c><anno>EndLocation</anno></c> and + <c>Anno</c> as well as <c><anno>EndLocation</anno></c> and <c><anno>ErrorLocation</anno></c> will be lines. If <c><anno>StartLocation</anno></c> is a pair of a line and a column - <c>attributes()</c> takes the form of an opaque compound + <c>Anno</c> takes the form of an opaque compound data type, and <c><anno>EndLocation</anno></c> and <c><anno>ErrorLocation</anno></c> will be pairs of a line and a column. The <em>token - attributes</em> contain information about the column and the + annotations</em> contain information about the column and the line where the token begins, as well as the text of the token (if the <c>text</c> option is given), all of which can - be accessed by calling <seealso - marker="#token_info/1">token_info/1,2</seealso>, <seealso - marker="#attributes_info/1">attributes_info/1,2</seealso>, + be accessed by calling <seealso marker="#column/1">column/1</seealso>, <seealso marker="#line/1">line/1</seealso>, <seealso marker="#location/1">location/1</seealso>, and <seealso marker="#text/1">text/1</seealso>.</p> <p>A <em>token</em> is a tuple containing information about - syntactic category, the token attributes, and the actual + syntactic category, the token annotations, and the actual terminal symbol. For punctuation characters (e.g. <c>;</c>, <c>|</c>) and reserved words, the category and the symbol coincide, and the token is represented by a two-tuple. @@ -172,7 +143,7 @@ <item><p>Short for <c>[return_comments, return_white_spaces]</c>.</p> </item> <tag><c>text</c></tag> - <item><p>Include the token's text in the token attributes. The + <item><p>Include the token's text in the token annotation. The text is the part of the input corresponding to the token.</p> </item> </taglist> @@ -306,150 +277,6 @@ </desc> </func> <func> - <name name="token_info" arity="1"/> - <fsummary>Return information about a token</fsummary> - <desc> - <p>Returns a list containing information about the token - <c><anno>Token</anno></c>. The order of the - <c><anno>TokenInfoTuple</anno></c>s is not - defined. See <seealso - marker="#token_info/2">token_info/2</seealso> for - information about specific - <c><anno>TokenInfoTuple</anno></c>s.</p> - <p>Note that if <c>token_info(Token, TokenItem)</c> returns - <c>undefined</c> for some <c>TokenItem</c>, the - item is not included in <c><anno>TokenInfo</anno></c>.</p> - </desc> - </func> - <func> - <name name="token_info" arity="2" clause_i="1"/> - <name name="token_info" arity="2" clause_i="2"/> - <fsummary>Return information about a token</fsummary> - <type name="token_item"/> - <type name="attribute_item"/> - <desc> - <p>Returns a list containing information about the token - <c><anno>Token</anno></c>. If one single - <c><anno>TokenItem</anno></c> is given the returned value is - the corresponding - <c>TokenInfoTuple</c>, or <c>undefined</c> if the - <c>TokenItem</c> has no value. If a list of - <c><anno>TokenItem</anno></c>s is given the result is a list of - <c><anno>TokenInfoTuple</anno></c>. The - <c><anno>TokenInfoTuple</anno></c>s will - appear with the corresponding <c><anno>TokenItem</anno></c>s in - the same order as the <c><anno>TokenItem</anno></c>s - appear in the list of <c>TokenItem</c>s. - <c><anno>TokenItem</anno></c>s with no value are not included - in the list of <c><anno>TokenInfoTuple</anno></c>.</p> - <p>The following <c><anno>TokenInfoTuple</anno></c>s with corresponding - <c><anno>TokenItem</anno></c>s are valid:</p> - <taglist> - <tag><c>{category, </c><seealso marker="#type-category"> - category()</seealso><c>}</c></tag> - <item><p>The category of the token.</p> - </item> - <tag><c>{column, </c><seealso marker="#type-column"> - column()</seealso><c>}</c></tag> - <item><p>The column where the token begins.</p> - </item> - <tag><c>{length, integer() > 0}</c></tag> - <item><p>The length of the token's text.</p> - </item> - <tag><c>{line, </c><seealso marker="#type-line"> - line()</seealso><c>}</c></tag> - <item><p>The line where the token begins.</p> - </item> - <tag><c>{location, </c><seealso marker="#type-location"> - location()</seealso><c>}</c></tag> - <item><p>The line and column where the token begins, or - just the line if the column unknown.</p> - </item> - <tag><c>{symbol, </c><seealso marker="#type-symbol"> - symbol()</seealso><c>}</c></tag> - <item><p>The token's symbol.</p> - </item> - <tag><c>{text, string()}</c></tag> - <item><p>The token's text.</p> - </item> - </taglist> - </desc> - </func> - <func> - <name name="attributes_info" arity="1"/> - <fsummary>Return information about token attributes</fsummary> - <desc> - <p>Returns a list containing information about the token - attributes <c><anno>Attributes</anno></c>. The order of the - <c><anno>AttributeInfoTuple</anno></c>s is not defined. - See <seealso - marker="#attributes_info/2">attributes_info/2</seealso> for - information about specific - <c><anno>AttributeInfoTuple</anno></c>s.</p> - <p>Note that if <c>attributes_info(Token, AttributeItem)</c> - returns <c>undefined</c> for some <c>AttributeItem</c> in - the list above, the item is not included in - <c><anno>AttributesInfo</anno></c>.</p> - </desc> - </func> - <func> - <name name="attributes_info" arity="2" clause_i="1"/> - <name name="attributes_info" arity="2" clause_i="2"/> - <fsummary>Return information about a token attributes</fsummary> - <type name="attribute_item"/> - <desc> - <p>Returns a list containing information about the token - attributes <c><anno>Attributes</anno></c>. If one single - <c><anno>AttributeItem</anno></c> is given the returned value is the - corresponding <c><anno>AttributeInfoTuple</anno></c>, - or <c>undefined</c> if the <c><anno>AttributeItem</anno></c> - has no value. If a list of <c><anno>AttributeItem</anno></c> - is given the result is a list of - <c><anno>AttributeInfoTuple</anno></c>. - The <c><anno>AttributeInfoTuple</anno></c>s - will appear with the corresponding <c><anno>AttributeItem</anno></c>s - in the same order as the <c><anno>AttributeItem</anno></c>s - appear in the list of <c><anno>AttributeItem</anno></c>s. - <c><anno>AttributeItem</anno></c>s with no - value are not included in the list of - <c><anno>AttributeInfoTuple</anno></c>.</p> - <p>The following <c><anno>AttributeInfoTuple</anno></c>s with - corresponding <c><anno>AttributeItem</anno></c>s are valid:</p> - <taglist> - <tag><c>{column, </c><seealso marker="#type-column"> - column()</seealso><c>}</c></tag> - <item><p>The column where the token begins.</p> - </item> - <tag><c>{length, integer() > 0}</c></tag> - <item><p>The length of the token's text.</p> - </item> - <tag><c>{line, </c><seealso marker="#type-line"> - line()</seealso><c>}</c></tag> - <item><p>The line where the token begins.</p> - </item> - <tag><c>{location, </c><seealso marker="#type-location"> - location()</seealso><c>}</c></tag> - <item><p>The line and column where the token begins, or - just the line if the column unknown.</p> - </item> - <tag><c>{text, string()}</c></tag> - <item><p>The token's text.</p> - </item> - </taglist> - </desc> - </func> - <func> - <name name="set_attribute" arity="3"/> - <fsummary>Set a token attribute value</fsummary> - <desc> - <p>Sets the value of the <c>line</c> attribute of the token - attributes <c><anno>Attributes</anno></c>.</p> - <p>The <c><anno>SetAttributeFun</anno></c> is called with the value of - the <c>line</c> attribute, and is to return the new value of - the <c>line</c> attribute.</p> - </desc> - </func> - <func> <name name="format_error" arity="1"/> <fsummary>Format an error descriptor</fsummary> <desc> diff --git a/lib/stdlib/doc/src/erl_tar.xml b/lib/stdlib/doc/src/erl_tar.xml index 898b55df72..1f4a43f622 100644 --- a/lib/stdlib/doc/src/erl_tar.xml +++ b/lib/stdlib/doc/src/erl_tar.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>2003</year><year>2013</year> + <year>2003</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/ets.xml b/lib/stdlib/doc/src/ets.xml index 7b01109ff8..9fb7d227a3 100644 --- a/lib/stdlib/doc/src/ets.xml +++ b/lib/stdlib/doc/src/ets.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>1996</year><year>2014</year> + <year>1996</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> @@ -98,10 +98,10 @@ All updates to single objects are guaranteed to be both <em>atomic</em> and <em>isolated</em>. This means that an updating operation towards a single object will either succeed or fail completely without any - effect at all (atomicy). + effect at all (atomicity). Nor can any intermediate results of the update be seen by other processes (isolation). Some functions that update several objects - state that they even guarantee atomicy and isolation for the entire + state that they even guarantee atomicity and isolation for the entire operation. In database terms the isolation level can be seen as "serializable", as if all isolated operations were carried out serially, one after the other in a strict order.</p> @@ -123,8 +123,9 @@ <p>Some of the functions uses a <em>match specification</em>, match_spec. A brief explanation is given in <seealso marker="#select/2">select/2</seealso>. For a detailed - description, see the chapter "Match specifications in Erlang" in - <em>ERTS User's Guide</em>.</p> + description, see chapter + <seealso marker="erts:match_spec">Match Specifications in Erlang</seealso> + in <em>ERTS User's Guide</em>.</p> </section> <datatypes> @@ -134,8 +135,7 @@ <datatype> <name>continuation()</name> <desc> - <p><marker id="type-continuation"/> - Opaque continuation used by <seealso marker="#select/1"> + <p>Opaque continuation used by <seealso marker="#select/1"> <c>select/1,3</c></seealso>, <seealso marker="#select_reverse/1"> <c>select_reverse/1,3</c></seealso>, <seealso marker="#match/1"> @@ -488,14 +488,39 @@ Error: fun containing local Erlang function calls <item><c>Item=fixed, Value=boolean()</c> <br></br> Indicates if the table is fixed by any process or not.</item> - <item> - <p><c>Item=safe_fixed, Value={FirstFixed,Info}|false</c> <br></br> + <item><marker id="info_2_safe_fixed_monotonic_time"/> + <p><c>Item=safe_fixed|safe_fixed_monotonic_time, Value={FixationTime,Info}|false</c> <br></br> </p> - <p>If the table has been fixed using <c>safe_fixtable/2</c>, - the call returns a tuple where <c>FirstFixed</c> is the + <p>If the table has been fixed using + <seealso marker="#safe_fixtable/2"><c>safe_fixtable/2</c></seealso>, + the call returns a tuple where <c>FixationTime</c> is the time when the table was first fixed by a process, which may or may not be one of the processes it is fixed by right now.</p> + <p>The format and value of <c>FixationTime</c> depends on + <c>Item</c>:</p> + <taglist> + <tag><c>safe_fixed</c></tag> + <item><p><c>FixationTime</c> will correspond to the result + returned by + <seealso marker="erts:erlang#timestamp/0">erlang:timestamp/0</seealso> + at the time of fixation. Note that when the system is using + single or multi + <seealso marker="erts:time_correction#Time_Warp_Modes">time warp + modes</seealso> this might produce strange results. This + since the usage of <c>safe_fixed</c> is not + <seealso marker="erts:time_correction#Time_Warp_Safe_Code">time warp + safe</seealso>. Time warp safe code need to use + <c>safe_fixed_monotonic_time</c> instead.</p></item> + + <tag><c>safe_fixed_monotonic_time</c></tag> + <item><p><c>FixationTime</c> will correspond to the result + returned by + <seealso marker="erts:erlang#monotonic_time/0">erlang:monotonic_time/0</seealso> + at the time of fixation. The usage of <c>safe_fixed_monotonic_time</c> is + <seealso marker="erts:time_correction#Time_Warp_Safe_Code">time warp + safe</seealso>.</p></item> + </taglist> <p><c>Info</c> is a possibly empty lists of tuples <c>{Pid,RefCount}</c>, one tuple for every process the table is fixed by right now. <c>RefCount</c> is the value @@ -1135,9 +1160,11 @@ clean_all_with_value(Tab,X,Key) -> table but never releases it, the memory used by the deleted objects will never be freed. The performance of operations on the table will also degrade significantly.</p> - <p>Use <c>info/2</c> to retrieve information about which - processes have fixed which tables. A system with a lot of - processes fixing tables may need a monitor which sends alarms + <p>Use + <seealso marker="#info_2_safe_fixed_monotonic_time"><c>info(Tab, + safe_fixed_monotonic_time)</c></seealso> to retrieve information + about which processes have fixed which tables. A system with a lot + of processes fixing tables may need a monitor which sends alarms when tables have been fixed for too long.</p> <p>Note that for tables of the <c>ordered_set</c> type, <c>safe_fixtable/2</c> is not necessary as calls to @@ -1594,6 +1621,8 @@ true</pre> if the match_spec does not match the object <c><anno>Tuple</anno></c>.</p> <p>This is a useful debugging and test tool, especially when writing complicated <c>ets:select/2</c> calls.</p> + <p>See also: <seealso marker="erts:erlang#match_spec_test/3"> + erlang:match_spec_test/3</seealso>.</p> </desc> </func> <func> diff --git a/lib/stdlib/doc/src/file_sorter.xml b/lib/stdlib/doc/src/file_sorter.xml index f033eebec7..bc24f02a99 100644 --- a/lib/stdlib/doc/src/file_sorter.xml +++ b/lib/stdlib/doc/src/file_sorter.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>2001</year><year>2013</year> + <year>2001</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/filelib.xml b/lib/stdlib/doc/src/filelib.xml index 2cf9490f4b..3ad159a66d 100644 --- a/lib/stdlib/doc/src/filelib.xml +++ b/lib/stdlib/doc/src/filelib.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>2003</year><year>2013</year> + <year>2003</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/filename.xml b/lib/stdlib/doc/src/filename.xml index 77e262dbe6..f284a7596c 100644 --- a/lib/stdlib/doc/src/filename.xml +++ b/lib/stdlib/doc/src/filename.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>1997</year><year>2013</year> + <year>1997</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> @@ -47,7 +47,12 @@ <p>The module supports raw file names in the way that if a binary is present, or the file name cannot be interpreted according to the return value of <seealso marker="kernel:file#native_name_encoding/0">file:native_name_encoding/0</seealso>, a raw file name will also be returned. For example filename:join/1 provided with a path component being a binary (and also not being possible to interpret under the current native file name encoding) will result in a raw file name being returned (the join operation will have been performed of course). For more information about raw file names, see the <seealso marker="kernel:file">file</seealso> module.</p> </description> - + <datatypes> + <datatype> + <name name="basedir_type"/> + </datatype> + </datatypes> + <funcs> <func> <name name="absname" arity="1"/> @@ -102,6 +107,155 @@ </desc> </func> <func> + <name name="basedir" arity="2"/> + <fsummary>Equivalent to <c>basedir(<anno>Type</anno>,<anno>Application</anno>,#{})</c>.</fsummary> + <desc> + <p> + Equivalent to <seealso marker="#basedir-3"> + basedir(<anno>Type</anno>, <anno>Application</anno>, #{})</seealso>. + </p> + </desc> + </func> + <func> + <name name="basedir" arity="3"/> + <fsummary></fsummary> + <desc><marker id="basedir-3"/> + <p> + Returns a suitable path, or paths, for a given type. + If <c>os</c> is not set in <c><anno>Opts</anno></c> the function will default to + the native option, i.e. <c>'linux'</c>, <c>'darwin'</c> or <c>'windows'</c>, as understood + by <c>os:type/0</c>. Anything not recognized as <c>'darwin'</c> or <c>'windows'</c> is + interpreted as <c>'linux'</c>.</p> + <p> + The options <c>'author'</c> and <c>'version'</c> are only used with <c>'windows'</c> option mode. + </p> + <list type="bulleted"> + <item><c>user_cache</c> + <p>The path location is intended for transient data files on a local machine.</p> + <p> + On Linux: + Respects the os environment variable <c>XDG_CACHE_HOME</c>. + </p> + <pre> +1> <input>filename:basedir(user_cache, "my_application", #{os=>linux}).</input> +"/home/otptest/.cache/my_application"</pre> + On Darwin: <pre> +1> <input>filename:basedir(user_cache, "my_application", #{os=>darwin}).</input> +"/home/otptest/Library/Caches/my_application"</pre> + On Windows: <pre> +1> <input>filename:basedir(user_cache, "My App").</input> +"c:/Users/otptest/AppData/Local/My App/Cache" +2> <input>filename:basedir(user_cache, "My App").</input> +"c:/Users/otptest/AppData/Local/My App/Cache" +3> <input>filename:basedir(user_cache, "My App", #{author=>"Erlang"}).</input> +"c:/Users/otptest/AppData/Local/Erlang/My App/Cache" +4> <input>filename:basedir(user_cache, "My App", #{version=>"1.2"}).</input> +"c:/Users/otptest/AppData/Local/My App/1.2/Cache" +5> <input>filename:basedir(user_cache, "My App", #{author=>"Erlang",version=>"1.2"}).</input> +"c:/Users/otptest/AppData/Local/Erlang/My App/1.2/Cache"</pre> + </item> + <item><c>user_config</c> + <p> + The path location is intended for persistent configuration files. + </p> + <p> + On Linux: + Respects the os environment variable <c>XDG_CONFIG_HOME</c>. + </p> + <pre> +2> <input>filename:basedir(user_config, "my_application", #{os=>linux}).</input> +"/home/otptest/.config/my_application"</pre> + On Darwin:<pre> +2> <input>filename:basedir(user_config, "my_application", #{os=>darwin}).</input> +"/home/otptest/Library/Application Support/my_application"</pre> + On Windows:<pre> +1> <input>filename:basedir(user_config, "My App").</input> +"c:/Users/otptest/AppData/Roaming/My App" +2> <input>filename:basedir(user_config, "My App", #{author=>"Erlang", version=>"1.2"}).</input> +"c:/Users/otptest/AppData/Roaming/Erlang/My App/1.2"</pre> + </item> + <item><c>user_data</c> + <p> + The path location is intended for persistent data files. + </p> + <p> + On Linux: + Respects the os environment variable <c>XDG_DATA_HOME</c>. + </p> + <pre> +3> <input>filename:basedir(user_data, "my_application", #{os=>linux}).</input> +"/home/otptest/.local/my_application"</pre> + On Darwin:<pre> +3> <input>filename:basedir(user_data, "my_application", #{os=>darwin}).</input> +"/home/otptest/Library/Application Support/my_application"</pre> + On Windows:<pre> +8> <input>filename:basedir(user_data, "My App").</input> +"c:/Users/otptest/AppData/Local/My App" +9> <input>filename:basedir(user_data, "My App",#{author=>"Erlang",version=>"1.2"}).</input> +"c:/Users/otptest/AppData/Local/Erlang/My App/1.2"</pre> + </item> + <item><c>user_log</c> + <p>The path location is intended for transient log files on a local machine.</p> + <p> + On Linux: + Respects the os environment variable <c>XDG_CACHE_HOME</c>.</p> + <pre> +4> <input>filename:basedir(user_log, "my_application", #{os=>linux}).</input> +"/home/otptest/.cache/my_application/log"</pre> + On Darwin:<pre> +4> <input>filename:basedir(user_log, "my_application", #{os=>darwin}).</input> +"/home/otptest/Library/Caches/my_application"</pre> + On Windows:<pre> +12> <input>filename:basedir(user_log, "My App").</input> +"c:/Users/otptest/AppData/Local/My App/Logs" +13> <input>filename:basedir(user_log, "My App",#{author=>"Erlang",version=>"1.2"}).</input> +"c:/Users/otptest/AppData/Local/Erlang/My App/1.2/Logs"</pre> + </item> + <item><c>site_config</c><p> + On Linux: + Respects the os environment variable <c>XDG_CONFIG_DIRS</c>.</p> +<pre> +5> <input>filename:basedir(site_data, "my_application", #{os=>linux}).</input> +["/usr/local/share/my_application", + "/usr/share/my_application"] +6> <input>os:getenv("XDG_CONFIG_DIRS").</input> +"/etc/xdg/xdg-ubuntu:/usr/share/upstart/xdg:/etc/xdg" +7> <input>filename:basedir(site_config, "my_application", #{os=>linux}).</input> +["/etc/xdg/xdg-ubuntu/my_application", + "/usr/share/upstart/xdg/my_application", + "/etc/xdg/my_application"] +8> <input>os:unsetenv("XDG_CONFIG_DIRS").</input> +true +9> <input>filename:basedir(site_config, "my_application", #{os=>linux}).</input> +["/etc/xdg/my_application"]</pre> + On Darwin:<pre> +5> <input>filename:basedir(site_config, "my_application", #{os=>darwin}).</input> +["/Library/Application Support/my_application"]</pre> + </item> + <item><c>site_data</c><p> + On Linux: + Respects the os environment variable <c>XDG_DATA_DIRS</c>.</p> + <pre> +10> <input>os:getenv("XDG_DATA_DIRS").</input> +"/usr/share/ubuntu:/usr/share/gnome:/usr/local/share/:/usr/share/" +11> <input>filename:basedir(site_data, "my_application", #{os=>linux}).</input> +["/usr/share/ubuntu/my_application", + "/usr/share/gnome/my_application", + "/usr/local/share/my_application", + "/usr/share/my_application"] +12> <input>os:unsetenv("XDG_DATA_DIRS").</input> +true +13> <input>filename:basedir(site_data, "my_application", #{os=>linux}).</input> +["/usr/local/share/my_application", + "/usr/share/my_application"]</pre> + On Darwin:<pre> +5> <input>filename:basedir(site_data, "my_application", #{os=>darwin}).</input> +["/Library/Application Support/my_application"]</pre> + </item> + </list> + </desc> + </func> + <func> <name name="basename" arity="1"/> <fsummary>Return the last component of a filename</fsummary> <desc> @@ -214,7 +368,7 @@ <desc> <p>Converts <c><anno>Path</anno></c> to a form accepted by the command shell and native applications on the current platform. On Windows, - forward slashes is converted to backward slashes. On all + forward slashes are converted to backward slashes. On all platforms, the name is normalized as done by <c>join/1</c>.</p> <pre> 19> <input>filename:nativename("/usr/local/bin/").</input> % Unix diff --git a/lib/stdlib/doc/src/gen_event.xml b/lib/stdlib/doc/src/gen_event.xml index c4bab45781..b2c482d3ed 100644 --- a/lib/stdlib/doc/src/gen_event.xml +++ b/lib/stdlib/doc/src/gen_event.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>1996</year><year>2014</year> + <year>1996</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/gen_fsm.xml b/lib/stdlib/doc/src/gen_fsm.xml index 4d594b8eb2..835e252704 100644 --- a/lib/stdlib/doc/src/gen_fsm.xml +++ b/lib/stdlib/doc/src/gen_fsm.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>1996</year><year>2014</year> + <year>1996</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> @@ -31,12 +31,23 @@ <module>gen_fsm</module> <modulesummary>Generic Finite State Machine Behaviour</modulesummary> <description> + <note> + <p> + There is a new behaviour + <seealso marker="gen_statem"><c>gen_statem</c></seealso> + that is intended to replace <c>gen_fsm</c> for new code. + It has the same features and add some really useful. + This module will not be removed for the foreseeable future + to keep old state machine implementations running. + </p> + </note> <p>A behaviour module for implementing a finite state machine. A generic finite state machine process (gen_fsm) 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 - <seealso marker="doc/design_principles:fsm">OTP Design Principles</seealso> for more information.</p> + <seealso marker="doc/design_principles:fsm">OTP Design Principles</seealso> for more information. + </p> <p>A gen_fsm 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 @@ -848,6 +859,7 @@ gen_fsm:sync_send_all_state_event -----> Module:handle_sync_event/4 <title>SEE ALSO</title> <p><seealso marker="gen_event">gen_event(3)</seealso>, <seealso marker="gen_server">gen_server(3)</seealso>, + <seealso marker="gen_statem">gen_statem(3)</seealso>, <seealso marker="supervisor">supervisor(3)</seealso>, <seealso marker="proc_lib">proc_lib(3)</seealso>, <seealso marker="sys">sys(3)</seealso></p> diff --git a/lib/stdlib/doc/src/gen_server.xml b/lib/stdlib/doc/src/gen_server.xml index 6d04771cd4..10dc978afc 100644 --- a/lib/stdlib/doc/src/gen_server.xml +++ b/lib/stdlib/doc/src/gen_server.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>1996</year><year>2014</year> + <year>1996</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> @@ -715,6 +715,7 @@ gen_server:abcast -----> Module:handle_cast/2 <title>SEE ALSO</title> <p><seealso marker="gen_event">gen_event(3)</seealso>, <seealso marker="gen_fsm">gen_fsm(3)</seealso>, + <seealso marker="gen_statem">gen_statem(3)</seealso>, <seealso marker="supervisor">supervisor(3)</seealso>, <seealso marker="proc_lib">proc_lib(3)</seealso>, <seealso marker="sys">sys(3)</seealso></p> diff --git a/lib/stdlib/doc/src/gen_statem.xml b/lib/stdlib/doc/src/gen_statem.xml new file mode 100644 index 0000000000..0e7d6e53e9 --- /dev/null +++ b/lib/stdlib/doc/src/gen_statem.xml @@ -0,0 +1,1671 @@ +<?xml version="1.0" encoding="utf-8" ?> +<!DOCTYPE erlref SYSTEM "erlref.dtd"> + +<erlref> + <header> + <copyright> + <year>2016</year> + <holder>Ericsson AB. All Rights Reserved.</holder> + </copyright> + <legalnotice> + Licensed under the Apache License, Version 2.0 (the "License"); + you may not use this file except in compliance with the License. + You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. + + </legalnotice> + + <title>gen_statem</title> + <prepared></prepared> + <docno></docno> + <date></date> + <rev></rev> + </header> + <module>gen_statem</module> + <modulesummary>Generic state machine behavior.</modulesummary> + <description> + <p> + This behavior module provides a state machine. Two + <seealso marker="#type-callback_mode"><em>callback modes</em></seealso> + are supported: + </p> + <list type="bulleted"> + <item> + <p>One for finite-state machines + (<seealso marker="gen_fsm"><c>gen_fsm</c></seealso> like), + which requires the state to be an atom and uses that state as + the name of the current callback function + </p> + </item> + <item> + <p>One without restriction on the state data type + that uses one callback function for all states + </p> + </item> + </list> + <note> + <p> + This is a new behavior in Erlang/OTP 19.0. + It has been thoroughly reviewed, is stable enough + to be used by at least two heavy OTP applications, and is here to stay. + Depending on user feedback, we do not expect + but can find it necessary to make minor + not backward compatible changes into Erlang/OTP 20.0. + </p> + </note> + <p> + The <c>gen_statem</c> behavior is intended to replace + <seealso marker="gen_fsm"><c>gen_fsm</c></seealso> for new code. + It has the same features and adds some really useful: + </p> + <list type="bulleted"> + <item>State code is gathered.</item> + <item>The state can be any term.</item> + <item>Events can be postponed.</item> + <item>Events can be self-generated.</item> + <item>A reply can be sent from a later state.</item> + <item>There can be multiple <c>sys</c> traceable replies.</item> + </list> + <p> + The callback model(s) for <c>gen_statem</c> differs from + the one for <seealso marker="gen_fsm"><c>gen_fsm</c></seealso>, + but it is still fairly easy to rewrite + from <c>gen_fsm</c> to <c>gen_statem</c>. + </p> + <p> + A generic state machine process (<c>gen_statem</c>) implemented + using this module has a standard set of interface functions + and includes functionality for tracing and error reporting. + It also fits into an OTP supervision tree. For more information, see + <seealso marker="doc/design_principles:statem">OTP Design Principles</seealso>. + </p> + <p> + A <c>gen_statem</c> assumes all specific parts to be located in a + callback module exporting a predefined set of functions. + The relationship between the behavior functions and the callback + functions is as follows:</p> + <pre> +gen_statem module Callback module +----------------- --------------- +gen_statem:start +gen_statem:start_link -----> Module:init/1 + +gen_statem:stop -----> Module:terminate/3 + +gen_statem:call +gen_statem:cast +erlang:send +erlang:'!' -----> Module:StateName/3 + Module:handle_event/4 + +- -----> Module:terminate/3 + +- -----> Module:code_change/4</pre> + <p> + Events are of different + <seealso marker="#type-event_type">types</seealso>, + so the callback functions can know the origin of an event + and how to respond. + </p> + <p> + If a callback function fails or returns a bad value, + the <c>gen_statem</c> terminates. However, an exception of class + <seealso marker="erts:erlang#throw/1"><c>throw</c></seealso> + is not regarded as an error but as a valid return. + </p> + <marker id="state_function"/> + <p> + The "<em>state function</em>" for a specific + <seealso marker="#type-state">state</seealso> + in a <c>gen_statem</c> is the callback function that is called + for all events in this state. It is selected depending on which + <seealso marker="#type-callback_mode"><em>callback mode</em></seealso> + that the implementation specifies when the server starts. + </p> + <p> + When the + <seealso marker="#type-callback_mode"><em>callback mode</em></seealso> + is <c>state_functions</c>, the state must be an atom and + is used as the state function name; see + <seealso marker="#Module:StateName/3"><c>Module:StateName/3</c></seealso>. + This gathers all code for a specific state + in one function as the <c>gen_statem</c> engine + branches depending on state name. + Notice that in this mode the mandatory callback function + <seealso marker="#Module:terminate/3"><c>Module:terminate/3</c></seealso> + makes the state name <c>terminate</c> unusable. + </p> + <p> + When the + <seealso marker="#type-callback_mode"><em>callback mode</em></seealso> + is <c>handle_event_function</c>, the state can be any term + and the state function name is + <seealso marker="#Module:handle_event/4"><c>Module:handle_event/4</c></seealso>. + This makes it easy to branch depending on state or event as you desire. + Be careful about which events you handle in which + states so that you do not accidentally postpone an event + forever creating an infinite busy loop. + </p> + <p> + The <c>gen_statem</c> enqueues incoming events in order of arrival + and presents these to the + <seealso marker="#state_function">state function</seealso> + in that order. The state function can postpone an event + so it is not retried in the current state. + After a state change the queue restarts with the postponed events. + </p> + <p> + The <c>gen_statem</c> event queue model is sufficient + to emulate the normal process message queue with selective receive. + Postponing an event corresponds to not matching it + in a receive statement, and changing states corresponds + to entering a new receive statement. + </p> + <p> + The <seealso marker="#state_function">state function</seealso> + can insert events using the + <seealso marker="#type-action"><c>action()</c></seealso> + <c>next_event</c> + and such an event is inserted as the next to present + to the state function. That is, as if it is + the oldest incoming event. A dedicated + <seealso marker="#type-event_type"><c>event_type()</c></seealso> + <c>internal</c> can be used for such events making them impossible + to mistake for external events. + </p> + <p> + Inserting an event replaces the trick of calling your own + state handling functions that you often would have to + resort to in, for example, + <seealso marker="gen_fsm"><c>gen_fsm</c></seealso> + to force processing an inserted event before others. + </p> + <note> + <p>If you in <c>gen_statem</c>, for example, postpone + an event in one state and then call another state function + of yours, you have not changed states and hence the postponed event + is not retried, which is logical but can be confusing. + </p> + </note> + <p> + For the details of a state transition, see type + <seealso marker="#type-transition_option"><c>transition_option()</c></seealso>. + </p> + <p> + A <c>gen_statem</c> handles system messages as described in + <seealso marker="sys"><c>sys</c></seealso>. + The <c>sys</c> module can be used for debugging a <c>gen_statem</c>. + </p> + <p> + Notice that a <c>gen_statem</c> does not trap exit signals + automatically, this must be explicitly initiated in + the callback module (by calling + <seealso marker="erts:erlang#process_flag/2"><c>process_flag(trap_exit, true)</c></seealso>. + </p> + <p> + Unless otherwise stated, all functions in this module fail if + the specified <c>gen_statem</c> does not exist or + if bad arguments are specified. + </p> + <p> + The <c>gen_statem</c> process can go into hibernation; see + <seealso marker="proc_lib#hibernate/3"><c>proc_lib:hibernate/3</c></seealso>. + It is done when a + <seealso marker="#state_function">state function</seealso> or + <seealso marker="#Module:init/1"><c>Module:init/1</c></seealso> + specifies <c>hibernate</c> in the returned + <seealso marker="#type-action"><c>Actions</c></seealso> + list. This feature can be useful to reclaim process heap memory + while the server is expected to be idle for a long time. + However, use this feature with care, + as hibernation can be too costly + to use after every event; see + <seealso marker="erts:erlang#hibernate/3"><c>erlang:hibernate/3</c></seealso>. + </p> + </description> + + <section> + <title>Example</title> + <p> + The following example shows a simple pushbutton model + for a toggling pushbutton implemented with + <seealso marker="#type-callback_mode"><em>callback mode</em></seealso> + <c>state_functions</c>. + You can push the button and it replies if it went on or off, + and you can ask for a count of how many times it has been + pushed to switch on. + </p> + <p>The following is the complete callback module file + <c>pushbutton.erl</c>:</p> + <code type="erl"> +-module(pushbutton). +-behaviour(gen_statem). + +-export([start/0,push/0,get_count/0,stop/0]). +-export([terminate/3,code_change/4,init/1]). +-export([on/3,off/3]). + +name() -> pushbutton_statem. % The registered server name +callback_mode() -> state_functions. + +%% API. This example uses a registered name name() +%% and does not link to the caller. +start() -> + gen_statem:start({local,name()}, ?MODULE, [], []). +push() -> + gen_statem:call(name(), push). +get_count() -> + gen_statem:call(name(), get_count). +stop() -> + gen_statem:stop(name()). + +%% Mandatory callback functions +terminate(_Reason, _State, _Data) -> + void. +code_change(_Vsn, State, Data, _Extra) -> + {callback_mode(),State,Data}. +init([]) -> + %% Set the callback mode and initial state + data. + %% Data is used only as a counter. + State = off, Data = 0, + {callback_mode(),State,Data}. + + +%%% State functions + +off({call,From}, push, Data) -> + %% Go to 'on', increment count and reply + %% that the resulting status is 'on' + {next_state,on,Data+1,[{reply,From,on}]}; +off(EventType, EventContent, Data) -> + handle_event(EventType, EventContent, Data). + +on({call,From}, push, Data) -> + %% Go to 'off' and reply that the resulting status is 'off' + {next_state,off,Data,[{reply,From,off}]}; +on(EventType, EventContent, Data) -> + handle_event(EventType, EventContent, Data). + +%% Handle events common to all states +handle_event({call,From}, get_count, Data) -> + %% Reply with the current count + {keep_state,Data,[{reply,From,Data}]}; +handle_event(_, _, Data) -> + %% Ignore all other events + {keep_state,Data}. + </code> + <p>The following is a shell session when running it:</p> + <pre> +1> pushbutton:start(). +{ok,<0.36.0>} +2> pushbutton:get_count(). +0 +3> pushbutton:push(). +on +4> pushbutton:get_count(). +1 +5> pushbutton:push(). +off +6> pushbutton:get_count(). +1 +7> pushbutton:stop(). +ok +8> pushbutton:push(). +** exception exit: {noproc,{gen_statem,call,[pushbutton_statem,push,infinity]}} + in function gen:do_for_proc/2 (gen.erl, line 261) + in call from gen_statem:call/3 (gen_statem.erl, line 386) + </pre> + <p> + To compare styles, here follows the same example using + <seealso marker="#type-callback_mode"><em>callback mode</em></seealso> + <c>state_functions</c>, or rather the code to replace + from function <c>init/1</c> of the <c>pushbutton.erl</c> + example file above: + </p> + <code type="erl"> +init([]) -> + %% Set the callback mode and initial state + data. + %% Data is used only as a counter. + State = off, Data = 0, + {handle_event_function,State,Data}. + + +%%% Event handling + +handle_event({call,From}, push, off, Data) -> + %% Go to 'on', increment count and reply + %% that the resulting status is 'on' + {next_state,on,Data+1,[{reply,From,on}]}; +handle_event({call,From}, push, on, Data) -> + %% Go to 'off' and reply that the resulting status is 'off' + {next_state,off,Data,[{reply,From,off}]}; +%% +%% Event handling common to all states +handle_event({call,From}, get_count, State, Data) -> + %% Reply with the current count + {next_state,State,Data,[{reply,From,Data}]}; +handle_event(_, _, State, Data) -> + %% Ignore all other events + {next_state,State,Data}. + </code> + </section> + + <datatypes> + <datatype> + <name name="server_name"/> + <desc> + <p> + Name specification to use when starting + a <c>gen_statem</c> server. See + <seealso marker="#start_link/3"><c>start_link/3</c></seealso> + and + <seealso marker="#type-server_ref"><c>server_ref()</c></seealso> + below. + </p> + </desc> + </datatype> + <datatype> + <name name="server_ref"/> + <desc> + <p> + Server specification to use when addressing + a <c>gen_statem</c> server. + See <seealso marker="#call/2"><c>call/2</c></seealso> and + <seealso marker="#type-server_name"><c>server_name()</c></seealso> + above. + </p> + <p>It can be:</p> + <taglist> + <tag><c>pid() | LocalName</c></tag> + <item> + <p> + The <c>gen_statem</c> is locally registered. + </p> + </item> + <tag><c>{Name,Node}</c></tag> + <item> + <p> + The <c>gen_statem</c> is locally registered + on another node. + </p> + </item> + <tag><c>{global,GlobalName}</c></tag> + <item> + <p> + The <c>gen_statem</c> is globally registered in + <seealso marker="kernel:global"><c>kernel:global</c></seealso>. + </p> + </item> + <tag><c>{via,RegMod,ViaName}</c></tag> + <item> + <p> + The <c>gen_statem</c> is registered in + an alternative process registry. + The registry callback module <c>RegMod</c> + is to export functions + <c>register_name/2</c>, <c>unregister_name/1</c>, + <c>whereis_name/1</c>, and <c>send/2</c>, + which are to behave like the corresponding functions in + <seealso marker="kernel:global"><c>kernel:global</c></seealso>. + Thus, <c>{via,global,GlobalName}</c> is the same as + <c>{global,GlobalName}</c>. + </p> + </item> + </taglist> + </desc> + </datatype> + <datatype> + <name name="debug_opt"/> + <desc> + <p> + Debug option that can be used when starting + a <c>gen_statem</c> server through, for example, + <seealso marker="#enter_loop/5"><c>enter_loop/5</c></seealso>. + </p> + <p> + For every entry in <c><anno>Dbgs</anno></c>, + the corresponding function in + <seealso marker="sys"><c>sys</c></seealso> is called. + </p> + </desc> + </datatype> + <datatype> + <name name="start_opt"/> + <desc> + <p> + Options that can be used when starting + a <c>gen_statem</c> server through, for example, + <seealso marker="#start_link/3"><c>start_link/3</c></seealso>. + </p> + </desc> + </datatype> + <datatype> + <name name="start_ret"/> + <desc> + <p> + Return value from the start functions, for example, + <seealso marker="#start_link/3"><c>start_link/3</c></seealso>. + </p> + </desc> + </datatype> + <datatype> + <name name="from"/> + <desc> + <p> + Destination to use when replying through, for example, the + <seealso marker="#type-action"><c>action()</c></seealso> + <c>{reply,From,Reply}</c> + to a process that has called the <c>gen_statem</c> server using + <seealso marker="#call/2"><c>call/2</c></seealso>. + </p> + </desc> + </datatype> + <datatype> + <name name="state"/> + <desc> + <p> + After a state change (<c>NextState =/= State</c>), + all postponed events are retried. + </p> + </desc> + </datatype> + <datatype> + <name name="state_name"/> + <desc> + <p> + If the + <seealso marker="#type-callback_mode"><em>callback mode</em></seealso> + is <c>state_functions</c>, + the state must be of this type. + </p> + </desc> + </datatype> + <datatype> + <name name="data"/> + <desc> + <p> + A term in which the state machine implementation + is to store any server data it needs. The difference between + this and the <seealso marker="#type-state"><c>state()</c></seealso> + itself is that a change in this data does not cause + postponed events to be retried. Hence, if a change + in this data would change the set of events that + are handled, then that data item is to be made + a part of the state. + </p> + </desc> + </datatype> + <datatype> + <name name="event_type"/> + <desc> + <p> + External events are of three types: + <c>{call,<anno>From</anno>}</c>, <c>cast</c>, or <c>info</c>. + <seealso marker="#call/2">Calls</seealso> + (synchronous) and + <seealso marker="#cast/2">casts</seealso> + originate from the corresponding API functions. + For calls, the event contains whom to reply to. + Type <c>info</c> originates from regular process messages sent + to the <c>gen_statem</c>. Also, the state machine + implementation can generate events of types + <c>timeout</c> and <c>internal</c> to itself. + </p> + </desc> + </datatype> + <datatype> + <name name="callback_mode"/> + <desc> + <p> + The <em>callback mode</em> is selected when starting the + <c>gen_statem</c> using the return value from + <seealso marker="#Module:init/1"><c>Module:init/1</c></seealso> + or when calling + <seealso marker="#enter_loop/5"><c>enter_loop/5,6,7</c></seealso>, + and with the return value from + <seealso marker="#Module:code_change/4"><c>Module:code_change/4</c></seealso>. + </p> + <taglist> + <tag><c>state_functions</c></tag> + <item> + <p> + The state must be of type + <seealso marker="#type-state_name"><c>state_name()</c></seealso> + and one callback function per state, that is, + <seealso marker="#Module:StateName/3"><c>Module:StateName/3</c></seealso>, + is used. + </p> + </item> + <tag><c>handle_event_function</c></tag> + <item> + <p> + The state can be any term and the callback function + <seealso marker="#Module:handle_event/4"><c>Module:handle_event/4</c></seealso> + is used for all states. + </p> + </item> + </taglist> + </desc> + </datatype> + <datatype> + <name name="transition_option"/> + <desc> + <p> + Transition options can be set by + <seealso marker="#type-action">actions</seealso> + and they modify the following in how + the state transition is done: + </p> + <list type="ordered"> + <item> + <p> + All + <seealso marker="#type-action">actions</seealso> + are processed in order of appearance. + </p> + </item> + <item> + <p> + If + <seealso marker="#type-postpone"><c>postpone()</c></seealso> + is <c>true</c>, + the current event is postponed. + </p> + </item> + <item> + <p> + If the state changes, the queue of incoming events + is reset to start with the oldest postponed. + </p> + </item> + <item> + <p> + All events stored with + <seealso marker="#type-action"><c>action()</c></seealso> + <c>next_event</c> + are inserted in the queue to be processed before + all other events. + </p> + </item> + <item> + <p> + If an + <seealso marker="#type-event_timeout"><c>event_timeout()</c></seealso> + is set through + <seealso marker="#type-action"><c>action()</c></seealso> + <c>timeout</c>, + an event timer can be started or a time-out zero event + can be enqueued. + </p> + </item> + <item> + <p> + The (possibly new) + <seealso marker="#state_function">state function</seealso> + is called with the oldest enqueued event if there is any, + otherwise the <c>gen_statem</c> goes into <c>receive</c> + or hibernation + (if + <seealso marker="#type-hibernate"><c>hibernate()</c></seealso> + is <c>true</c>) + to wait for the next message. In hibernation the next + non-system event awakens the <c>gen_statem</c>, or rather + the next incoming message awakens the <c>gen_statem</c>, + but if it is a system event + it goes right back into hibernation. + </p> + </item> + </list> + </desc> + </datatype> + <datatype> + <name name="postpone"/> + <desc> + <p> + If <c>true</c>, postpones the current event and retries + it when the state changes + (<c>NextState =/= State</c>). + </p> + </desc> + </datatype> + <datatype> + <name name="hibernate"/> + <desc> + <p> + If <c>true</c>, hibernates the <c>gen_statem</c> + by calling + <seealso marker="proc_lib#hibernate/3"><c>proc_lib:hibernate/3</c></seealso> + before going into <c>receive</c> + to wait for a new external event. + If there are enqueued events, + to prevent receiving any new event, an + <seealso marker="erts:erlang#garbage_collect/0"><c>erlang:garbage_collect/0</c></seealso> + is done instead to simulate + that the <c>gen_statem</c> entered hibernation + and immediately got awakened by the oldest enqueued event. + </p> + </desc> + </datatype> + <datatype> + <name name="event_timeout"/> + <desc> + <p> + Generates an event of + <seealso marker="#type-event_type"><c>event_type()</c></seealso> + <c>timeout</c> + after this time (in milliseconds) unless another + event arrives in which case this time-out is cancelled. + Notice that a retried or inserted event + counts like a new in this respect. + </p> + <p> + If the value is <c>infinity</c>, no timer is started, as + it never triggers anyway. + </p> + <p> + If the value is <c>0</c>, the time-out event is immediately enqueued + unless there already are enqueued events, as the + time-out is then immediately cancelled. + This is a feature ensuring that a time-out <c>0</c> event + is processed before any not yet received external event. + </p> + <p> + Notice that it is not possible or needed to cancel this time-out, + as it is cancelled automatically by any other event. + </p> + </desc> + </datatype> + <datatype> + <name name="action"/> + <desc> + <p> + These state transition actions can be invoked by + returning them from the + <seealso marker="#state_function">state function</seealso>, from + <seealso marker="#Module:init/1"><c>Module:init/1</c></seealso> + or by giving them to + <seealso marker="#enter_loop/6"><c>enter_loop/6,7</c></seealso>. + </p> + <p> + Actions are executed in the containing list order. + </p> + <p> + Actions that set + <seealso marker="#type-transition_option">transition options</seealso> + override any previous of the same type, + so the last in the containing list wins. + For example, the last + <seealso marker="#type-event_timeout"><c>event_timeout()</c></seealso> + overrides any other <c>event_timeout()</c> in the list. + </p> + <taglist> + <tag><c>postpone</c></tag> + <item> + <p> + Sets the + <seealso marker="#type-transition_option"><c>transition_option()</c></seealso> + <seealso marker="#type-postpone"><c>postpone()</c></seealso> + for this state transition. + This action is ignored when returned from + <seealso marker="#Module:init/1"><c>Module:init/1</c></seealso> + or given to + <seealso marker="#enter_loop/5"><c>enter_loop/5,6</c></seealso>, + as there is no event to postpone in those cases. + </p> + </item> + <tag><c>hibernate</c></tag> + <item> + <p> + Sets the + <seealso marker="#type-transition_option"><c>transition_option()</c></seealso> + <seealso marker="#type-hibernate"><c>hibernate()</c></seealso> + for this state transition. + </p> + </item> + <tag><c>Timeout</c></tag> + <item> + <p> + Short for <c>{timeout,Timeout,Timeout}</c>, that is, + the time-out message is the time-out time. + This form exists to make the + <seealso marker="#state_function">state function</seealso> + return value <c>{next_state,NextState,NewData,Timeout}</c> + allowed like for <c>gen_fsm</c>'s + <seealso marker="gen_fsm#Module:StateName/2"><c>Module:StateName/2</c></seealso>. + </p> + </item> + <tag><c>timeout</c></tag> + <item> + <p> + Sets the + <seealso marker="#type-transition_option"><c>transition_option()</c></seealso> + <seealso marker="#type-event_timeout"><c>event_timeout()</c></seealso> + to <c><anno>Time</anno></c> with <c><anno>EventContent</anno></c>. + </p> + </item> + <tag><c>reply_action()</c></tag> + <item> + <p> + Replies to a caller. + </p> + </item> + <tag><c>next_event</c></tag> + <item> + <p> + Stores the specified <c><anno>EventType</anno></c> + and <c><anno>EventContent</anno></c> for insertion after all + actions have been executed. + </p> + <p> + The stored events are inserted in the queue as the next to process + before any already queued events. The order of these stored events + is preserved, so the first <c>next_event</c> in the containing + list becomes the first to process. + </p> + <p> + An event of type + <seealso marker="#type-event_type"><c>internal</c></seealso> + is to be used when you want to reliably distinguish + an event inserted this way from any external event. + </p> + </item> + </taglist> + </desc> + </datatype> + <datatype> + <name name="reply_action"/> + <desc> + <p> + Replies to a caller waiting for a reply in + <seealso marker="#call/2"><c>call/2</c></seealso>. + <c><anno>From</anno></c> must be the term from argument + <seealso marker="#type-event_type"><c>{call,<anno>From</anno>}</c></seealso> + to the + <seealso marker="#state_function">state function</seealso>. + </p> + </desc> + </datatype> + <datatype> + <name name="state_function_result"/> + <desc> + <taglist> + <tag><c>next_state</c></tag> + <item> + <p> + The <c>gen_statem</c> does a state transition to + <c><anno>NextStateName</anno></c> + (which can be the same as the current state), + sets <c><anno>NewData</anno></c>, + and executes all <c><anno>Actions</anno></c>. + </p> + </item> + </taglist> + <p> + All these terms are tuples or atoms and this property + will hold in any future version of <c>gen_statem</c>. + </p> + </desc> + </datatype> + <datatype> + <name name="handle_event_result"/> + <desc> + <taglist> + <tag><c>next_state</c></tag> + <item> + <p> + The <c>gen_statem</c> does a state transition to + <c><anno>NextState</anno></c> + (which can be the same as the current state), + sets <c><anno>NewData</anno></c>, + and executes all <c><anno>Actions</anno></c>. + </p> + </item> + </taglist> + <p> + All these terms are tuples or atoms and this property + will hold in any future version of <c>gen_statem</c>. + </p> + </desc> + </datatype> + <datatype> + <name name="common_state_callback_result"/> + <desc> + <taglist> + <tag><c>stop</c></tag> + <item> + <p> + Terminates the <c>gen_statem</c> by calling + <seealso marker="#Module:terminate/3"><c>Module:terminate/3</c></seealso> + with <c>Reason</c> and + <c><anno>NewData</anno></c>, if specified. + </p> + </item> + <tag><c>stop_and_reply</c></tag> + <item> + <p> + Sends all <c><anno>Replies</anno></c>, + then terminates the <c>gen_statem</c> by calling + <seealso marker="#Module:terminate/3"><c>Module:terminate/3</c></seealso> + with <c>Reason</c> and + <c><anno>NewData</anno></c>, if specified. + </p> + </item> + <tag><c>keep_state</c></tag> + <item> + <p> + The <c>gen_statem</c> keeps the current state, or + does a state transition to the current state if you like, + sets <c><anno>NewData</anno></c>, + and executes all <c><anno>Actions</anno></c>. + This is the same as + <c>{next_state,CurrentState,<anno>NewData</anno>,<anno>Actions</anno>}</c>. + </p> + </item> + <tag><c>keep_state_and_data</c></tag> + <item> + <p> + The <c>gen_statem</c> keeps the current state or + does a state transition to the current state if you like, + keeps the current server data, + and executes all <c><anno>Actions</anno></c>. + This is the same as + <c>{next_state,CurrentState,CurrentData,<anno>Actions</anno>}</c>. + </p> + </item> + </taglist> + <p> + All these terms are tuples or atoms and this property + will hold in any future version of <c>gen_statem</c>. + </p> + </desc> + </datatype> + </datatypes> + + <funcs> + <func> + <name name="call" arity="2"/> + <name name="call" arity="3"/> + <fsummary>Make a synchronous call to a <c>gen_statem</c>.</fsummary> + <desc> + <p> + Makes a synchronous call to the <c>gen_statem</c> + <seealso marker="#type-server_ref"><c><anno>ServerRef</anno></c></seealso> + by sending a request + and waiting until its reply arrives. + The <c>gen_statem</c> calls the + <seealso marker="#state_function">state function</seealso> with + <seealso marker="#type-event_type"><c>event_type()</c></seealso> + <c>{call,From}</c> and event content + <c><anno>Request</anno></c>. + </p> + <p> + A <c><anno>Reply</anno></c> is generated when a + <seealso marker="#state_function">state function</seealso> + returns with + <c>{reply,From,<anno>Reply</anno>}</c> as one + <seealso marker="#type-action"><c>action()</c></seealso>, + and that <c><anno>Reply</anno></c> becomes the return value + of this function. + </p> + <p> + <c><anno>Timeout</anno></c> is an integer > 0, + which specifies how many milliseconds to wait for a reply, + or the atom <c>infinity</c> to wait indefinitely, + which is the default. If no reply is received within + the specified time, the function call fails. + </p> + <note> + <p> + To avoid getting a late reply in the caller's + inbox, this function spawns a proxy process that + does the call. A late reply gets delivered to the + dead proxy process, hence gets discarded. This is + less efficient than using + <c><anno>Timeout</anno> =:= infinity</c>. + </p> + </note> + <p> + The call can fail, for example, if the <c>gen_statem</c> dies + before or during this function call. + </p> + </desc> + </func> + + <func> + <name name="cast" arity="2"/> + <fsummary>Send an asynchronous event to a <c>gen_statem</c>.</fsummary> + <desc> + <p> + Sends an asynchronous event to the <c>gen_statem</c> + <seealso marker="#type-server_ref"><c><anno>ServerRef</anno></c></seealso> + and returns <c>ok</c> immediately, + ignoring if the destination node or <c>gen_statem</c> + does not exist. + The <c>gen_statem</c> calls the + <seealso marker="#state_function">state function</seealso> with + <seealso marker="#type-event_type"><c>event_type()</c></seealso> + <c>cast</c> and event content + <c><anno>Msg</anno></c>. + </p> + </desc> + </func> + + <func> + <name name="enter_loop" arity="5"/> + <fsummary>Enter the <c>gen_statem</c> receive loop.</fsummary> + <desc> + <p> + The same as + <seealso marker="#enter_loop/7"><c>enter_loop/7</c></seealso> + except that no + <seealso marker="#type-server_name"><c>server_name()</c></seealso> + must have been registered. + </p> + </desc> + </func> + + <func> + <name name="enter_loop" arity="6"/> + <fsummary>Enter the <c>gen_statem</c> receive loop.</fsummary> + <desc> + <p> + If <c><anno>Server_or_Actions</anno></c> is a <c>list()</c>, + the same as + <seealso marker="#enter_loop/7"><c>enter_loop/7</c></seealso> + except that no + <seealso marker="#type-server_name"><c>server_name()</c></seealso> + must have been registered and + <c>Actions = <anno>Server_or_Actions</anno></c>. + </p> + <p> + Otherwise the same as + <seealso marker="#enter_loop/7"><c>enter_loop/7</c></seealso> + with + <c>Server = <anno>Server_or_Actions</anno></c> and + <c>Actions = []</c>. + </p> + </desc> + </func> + + <func> + <name name="enter_loop" arity="7"/> + <fsummary>Enter the <c>gen_statem</c> receive loop.</fsummary> + <desc> + <p> + Makes the calling process become a <c>gen_statem</c>. + Does not return, instead the calling process enters + the <c>gen_statem</c> receive loop and becomes + a <c>gen_statem</c> server. + The process <em>must</em> have been started + using one of the start functions in + <seealso marker="proc_lib"><c>proc_lib</c></seealso>. + 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 <c>gen_statem</c> behavior provides. + </p> + <p> + <c><anno>Module</anno></c>, <c><anno>Opts</anno></c>, and + <c><anno>Server</anno></c> have the same meanings + as when calling + <seealso marker="#start_link/3"><c>start[_link]/3,4</c></seealso>. + However, the + <seealso marker="#type-server_name"><c>server_name()</c></seealso> + name must have been registered accordingly + <em>before</em> this function is called.</p> + <p> + <c><anno>CallbackMode</anno></c>, <c><anno>State</anno></c>, + <c><anno>Data</anno></c>, and <c><anno>Actions</anno></c> + have the same meanings as in the return value of + <seealso marker="#Module:init/1"><c>Module:init/1</c></seealso>. + Also, the callback module <c><anno>Module</anno></c> + does not need to export an <c>init/1</c> function. + </p> + <p> + The function fails if the calling process was not started by a + <seealso marker="proc_lib"><c>proc_lib</c></seealso> + start function, or if it is not registered + according to + <seealso marker="#type-server_name"><c>server_name()</c></seealso>. + </p> + </desc> + </func> + + <func> + <name name="reply" arity="1"/> + <name name="reply" arity="2"/> + <fsummary>Reply to a caller.</fsummary> + <desc> + <p> + This function can be used by a <c>gen_statem</c> + to explicitly send a reply to a process that waits in + <seealso marker="#call/2"><c>call/2</c></seealso> + when the reply cannot be defined in + the return value of a + <seealso marker="#state_function">state function</seealso>. + </p> + <p> + <c><anno>From</anno></c> must be the term from argument + <seealso marker="#type-event_type"><c>{call,<anno>From</anno>}</c></seealso> + to the + <seealso marker="#state_function">state function</seealso>. + <c><anno>From</anno></c> and <c><anno>Reply</anno></c> + can also be specified using a + <seealso marker="#type-reply_action"><c>reply_action()</c></seealso> + and multiple replies with a list of them. + </p> + <note> + <p> + A reply sent with this function is not visible + in <seealso marker="sys"><c>sys</c></seealso> debug output. + </p> + </note> + </desc> + </func> + + <func> + <name name="start" arity="3"/> + <name name="start" arity="4"/> + <fsummary>Create a standalone <c>gen_statem</c> process.</fsummary> + <desc> + <p> + Creates a standalone <c>gen_statem</c> process according to + OTP design principles (using + <seealso marker="proc_lib"><c>proc_lib</c></seealso> + primitives). + As it does not get linked to the calling process, + this start function cannot be used by a supervisor + to start a child. + </p> + <p> + For a description of arguments and return values, see + <seealso marker="#start_link/3"><c>start_link/3,4</c></seealso>. + </p> + </desc> + </func> + + <func> + <name name="start_link" arity="3"/> + <name name="start_link" arity="4"/> + <fsummary>Create a linked <c>gen_statem</c> process.</fsummary> + <desc> + <p> + Creates a <c>gen_statem</c> process according + to OTP design principles + (using + <seealso marker="proc_lib"><c>proc_lib</c></seealso> + primitives) + that is linked to the calling process. + This is essential when the <c>gen_statem</c> must be part of + a supervision tree so it gets linked to its supervisor. + </p> + <p> + The <c>gen_statem</c> process calls + <seealso marker="#Module:init/1"><c>Module:init/1</c></seealso> + to initialize the server. To ensure a synchronized startup + procedure, <c>start_link/3,4</c> does not return until + <seealso marker="#Module:init/1"><c>Module:init/1</c></seealso> + has returned. + </p> + <p> + <c><anno>ServerName</anno></c> specifies the + <seealso marker="#type-server_name"><c>server_name()</c></seealso> + to register for the <c>gen_statem</c>. + If the <c>gen_statem</c> is started with <c>start_link/3</c>, + no <c><anno>ServerName</anno></c> is provided and + the <c>gen_statem</c> is not registered. + </p> + <p><c><anno>Module</anno></c> is the name of the callback module.</p> + <p> + <c><anno>Args</anno></c> is an arbitrary term that is passed as + the argument to + <seealso marker="#Module:init/1"><c>Module:init/1</c></seealso>. + </p> + <list type="bulleted"> + <item> + <p> + If option <c>{timeout,Time}</c> is present in + <c><anno>Opts</anno></c>, the <c>gen_statem</c> + is allowed to spend <c>Time</c> milliseconds initializing + or it terminates and the start function returns + <seealso marker="#type-start_ret"><c>{error,timeout}</c></seealso>. + </p> + </item> + <item> + <p> + If option + <seealso marker="#type-debug_opt"><c>{debug,Dbgs}</c></seealso> + is present in <c><anno>Opts</anno></c>, debugging through + <seealso marker="sys"><c>sys</c></seealso> is activated. + </p> + </item> + <item> + <p> + If option <c>{spawn_opt,SpawnOpts}</c> is present in + <c><anno>Opts</anno></c>, <c>SpawnOpts</c> is passed + as option list to + <seealso marker="erts:erlang#spawn_opt/2"><c>erlang:spawn_opt/2</c></seealso>, + which is used to spawn the <c>gen_statem</c> process. + </p> + </item> + </list> + <note> + <p> + Using spawn option <c>monitor</c> is not + allowed, it causes this function to fail with reason + <c>badarg</c>. + </p> + </note> + <p> + If the <c>gen_statem</c> is successfully created + and initialized, this function returns + <seealso marker="#type-start_ret"><c>{ok,Pid}</c></seealso>, + where <c>Pid</c> is the <c>pid()</c> + of the <c>gen_statem</c>. + If a process with the specified <c><anno>ServerName</anno></c> + exists already, this function returns + <seealso marker="#type-start_ret"><c>{error,{already_started,Pid}}</c></seealso>, + where <c>Pid</c> is the <c>pid()</c> of that process. + </p> + <p> + If <c>Module:init/1</c> fails with <c>Reason</c>, + this function returns + <seealso marker="#type-start_ret"><c>{error,Reason}</c></seealso>. + If <c>Module:init/1</c> returns + <seealso marker="#type-start_ret"><c>{stop,Reason}</c></seealso> + or + <seealso marker="#type-start_ret"><c>ignore</c></seealso>, + the process is terminated and this function + returns + <seealso marker="#type-start_ret"><c>{error,Reason}</c></seealso> + or + <seealso marker="#type-start_ret"><c>ignore</c></seealso>, + respectively. + </p> + </desc> + </func> + + <func> + <name name="stop" arity="1"/> + <fsummary>Synchronously stop a generic server.</fsummary> + <desc> + <p> + The same as + <seealso marker="#stop/3"><c>stop(<anno>ServerRef</anno>, normal, infinity)</c></seealso>. + </p> + </desc> + </func> + + <func> + <name name="stop" arity="3"/> + <fsummary>Synchronously stop a generic server.</fsummary> + <desc> + <p> + Orders the <c>gen_statem</c> + <seealso marker="#type-server_ref"><c><anno>ServerRef</anno></c></seealso> + to exit with the specified <c><anno>Reason</anno></c> + and waits for it to terminate. + The <c>gen_statem</c> calls + <seealso marker="#Module:terminate/3"><c>Module:terminate/3</c></seealso> + before exiting. + </p> + <p> + This function returns <c>ok</c> if the server terminates + with the expected reason. Any other reason than <c>normal</c>, + <c>shutdown</c>, or <c>{shutdown,Term}</c> causes an + error report to be issued through + <seealso marker="kernel:error_logger#format/2"><c>error_logger:format/2</c></seealso>. + The default <c><anno>Reason</anno></c> is <c>normal</c>. + </p> + <p> + <c><anno>Timeout</anno></c> is an integer > 0, + which specifies how many milliseconds to wait for the server to + terminate, or the atom <c>infinity</c> to wait indefinitely. + Defaults to <c>infinity</c>. + If the server does not terminate within the specified time, + a <c>timeout</c> exception is raised. + </p> + <p> + If the process does not exist, a <c>noproc</c> exception + is raised. + </p> + </desc> + </func> + </funcs> + + <section> + <title>Callback Functions</title> + <p> + The following functions are to be exported from a + <c>gen_statem</c> callback module. + </p> + </section> + + <funcs> + <func> + <name>Module:code_change(OldVsn, OldState, OldData, Extra) -> + Result + </name> + <fsummary>Update the internal state during upgrade/downgrade.</fsummary> + <type> + <v>OldVsn = Vsn | {down,Vsn}</v> + <v> Vsn = term()</v> + <v>OldState = NewState = term()</v> + <v>Extra = term()</v> + <v>Result = {NewCallbackMode,NewState,NewData} | Reason</v> + <v> + NewCallbackMode = + <seealso marker="#type-callback_mode">callback_mode()</seealso> + </v> + <v> + OldState = NewState = + <seealso marker="#type-state">state()</seealso> + </v> + <v> + OldData = NewData = + <seealso marker="#type-data">data()</seealso> + </v> + <v>Reason = term()</v> + </type> + <desc> + <p> + This function is called by a <c>gen_statem</c> when it is to + update its internal state during a release upgrade/downgrade, + that is, when the instruction <c>{update,Module,Change,...}</c>, + where <c>Change={advanced,Extra}</c>, is specified in the + <seealso marker="sasl:appup"><c>appup</c></seealso> + file. For more information, see + <seealso marker="doc/design_principles:release_handling#instr">OTP Design Principles</seealso>. + </p> + <p> + For an upgrade, <c>OldVsn</c> is <c>Vsn</c>, and + for a downgrade, <c>OldVsn</c> is + <c>{down,Vsn}</c>. <c>Vsn</c> is defined by the <c>vsn</c> + attribute(s) of the old version of the callback module + <c>Module</c>. If no such attribute is defined, the version + is the checksum of the Beam file. + </p> + <note> + <p> + If you would dare to change + <seealso marker="#type-callback_mode"><em>callback mode</em></seealso> + during release upgrade/downgrade, the upgrade is no problem, + as the new code surely knows what <em>callback mode</em> + it needs. However, for a downgrade this function must + know from argument <c>Extra</c> that comes from the + <seealso marker="sasl:appup"><c>sasl:appup</c></seealso> + file what <em>callback mode</em> the old code did use. + It can also be possible to figure this out + from argument <c>{down,Vsn}</c>, as <c>Vsn</c> + in effect defines the old callback module version. + </p> + </note> + <p> + <c>OldState</c> and <c>OldData</c> is the internal state + of the <c>gen_statem</c>. + </p> + <p> + <c>Extra</c> is passed "as is" from the <c>{advanced,Extra}</c> + part of the update instruction. + </p> + <p> + If successful, the function must return the updated + internal state in an + <c>{NewCallbackMode,NewState,NewData}</c> tuple. + </p> + <p> + If the function returns <c>Reason</c>, the ongoing + upgrade fails and rolls back to the old release.</p> + <p> + This function can use + <seealso marker="erts:erlang#throw/1"><c>erlang:throw/1</c></seealso> + to return <c>Result</c> or <c>Reason</c>. + </p> + </desc> + </func> + + <func> + <name>Module:init(Args) -> Result</name> + <fsummary>Initialize process and internal state.</fsummary> + <type> + <v>Args = term()</v> + <v>Result = {CallbackMode,State,Data}</v> + <v> | {CallbackMode,State,Data,Actions}</v> + <v> | {stop,Reason} | ignore</v> + <v> + CallbackMode = + <seealso marker="#type-callback_mode">callback_mode()</seealso> + </v> + <v>State = <seealso marker="#type-state">state()</seealso></v> + <v> + Data = <seealso marker="#type-data">data()</seealso> + </v> + <v> + Actions = + [<seealso marker="#type-action">action()</seealso>] | + <seealso marker="#type-action">action()</seealso> + </v> + <v>Reason = term()</v> + </type> + <desc> + <marker id="Module:init-1"/> + <p> + Whenever a <c>gen_statem</c> is started using + <seealso marker="#start_link/3"><c>start_link/3,4</c></seealso> + or + <seealso marker="#start/3"><c>start/3,4</c></seealso>, + this function is called by the new process to initialize + the implementation state and server data. + </p> + <p> + <c>Args</c> is the <c>Args</c> argument provided to the start + function. + </p> + <p> + If the initialization is successful, the function is to + return <c>{CallbackMode,State,Data}</c> or + <c>{CallbackMode,State,Data,Actions}</c>. + <c>CallbackMode</c> selects the + <seealso marker="#type-callback_mode"><em>callback mode</em></seealso> + of the <c>gen_statem</c>. + <c>State</c> is the initial + <seealso marker="#type-state"><c>state()</c></seealso> + and <c>Data</c> the initial server + <seealso marker="#type-data"><c>data()</c></seealso>. + </p> + <p> + The <seealso marker="#type-action"><c>Actions</c></seealso> + are executed when entering the first + <seealso marker="#type-state">state</seealso> just as for a + <seealso marker="#state_function">state function</seealso>. + </p> + <p> + If the initialization fails, + the function is to return <c>{stop,Reason}</c> + or <c>ignore</c>; see + <seealso marker="#start_link/3"><c>start_link/3,4</c></seealso>. + </p> + <p> + This function can use + <seealso marker="erts:erlang#throw/1"><c>erlang:throw/1</c></seealso> + to return <c>Result</c>. + </p> + </desc> + </func> + + <func> + <name>Module:format_status(Opt, [PDict,State,Data]) -> + Status + </name> + <fsummary>Optional function for providing a term describing the + current <c>gen_statem</c> status.</fsummary> + <type> + <v>Opt = normal | terminate</v> + <v>PDict = [{Key, Value}]</v> + <v> + State = + <seealso marker="#type-state">state()</seealso> + </v> + <v> + Data = + <seealso marker="#type-data">data()</seealso> + </v> + <v>Key = term()</v> + <v>Value = term()</v> + <v>Status = term()</v> + </type> + <desc> + <note> + <p> + This callback is optional, so a callback module does not need + to export it. The <c>gen_statem</c> module provides a default + implementation of this function that returns + <c>{State,Data}</c>. If this callback fails, the default + function returns <c>{State,Info}</c>, + where <c>Info</c> informs of the crash but no details, + to hide possibly sensitive data. + </p> + </note> + <p>This function is called by a <c>gen_statem</c> process when + any of the following apply:</p> + <list type="bulleted"> + <item> + One of + <seealso marker="sys#get_status/1"><c>sys:get_status/1,2</c></seealso> + is invoked to get the <c>gen_statem</c> status. <c>Opt</c> is set + to the atom <c>normal</c> for this case. + </item> + <item> + The <c>gen_statem</c> terminates abnormally and logs an error. + <c>Opt</c> is set to the atom <c>terminate</c> for this case. + </item> + </list> + <p> + This function is useful for changing the form and + appearance of the <c>gen_statem</c> status for these cases. A + callback module wishing to change the + <seealso marker="sys#get_status/1"><c>sys:get_status/1,2</c></seealso> + return value and how + its status appears in termination error logs exports an + instance of <c>format_status/2</c>, which returns a term + describing the current status of the <c>gen_statem</c>. + </p> + <p> + <c>PDict</c> is the current value of the process dictionary + of the <c>gen_statem</c>. + </p> + <p> + <seealso marker="#type-state"><c>State</c></seealso> + is the internal state of the <c>gen_statem</c>. + </p> + <p> + <seealso marker="#type-data"><c>Data</c></seealso> + is the internal server data of the <c>gen_statem</c>. + </p> + <p> + The function is to return <c>Status</c>, a term that + changes the details of the current state and status of + the <c>gen_statem</c>. There are no restrictions on the + form <c>Status</c> can take, but for the + <seealso marker="sys#get_status/1"><c>sys:get_status/1,2</c></seealso> + case (when <c>Opt</c> + is <c>normal</c>), the recommended form for + the <c>Status</c> value is <c>[{data, [{"State", + Term}]}]</c>, where <c>Term</c> provides relevant details of + the <c>gen_statem</c> state. Following this recommendation is not + required, but it makes the callback module status + consistent with the rest of the + <seealso marker="sys#get_status/1"><c>sys:get_status/1,2</c></seealso> + return value. + </p> + <p> + One use for this function is to return compact alternative + state representations to avoid having large state terms + printed in log files. Another use is to hide sensitive data from + being written to the error log. + </p> + <p> + This function can use + <seealso marker="erts:erlang#throw/1"><c>erlang:throw/1</c></seealso> + to return <c>Status</c>. + </p> + </desc> + </func> + + <func> + <name>Module:StateName(EventType, EventContent, Data) -> + StateFunctionResult + </name> + <name>Module:handle_event(EventType, EventContent, + State, Data) -> HandleEventResult + </name> + <fsummary>Handle an event.</fsummary> + <type> + <v> + EventType = + <seealso marker="#type-event_type">event_type()</seealso> + </v> + <v>EventContent = term()</v> + <v> + State = + <seealso marker="#type-state">state()</seealso> + </v> + <v> + Data = NewData = + <seealso marker="#type-data">data()</seealso> + </v> + <v> + StateFunctionResult = + <seealso marker="#type-state_function_result">state_function_result()</seealso> + </v> + <v> + HandleEventResult = + <seealso marker="#type-handle_event_result">handle_event_result()</seealso> + </v> + </type> + <desc> + <p> + Whenever a <c>gen_statem</c> receives an event from + <seealso marker="#call/2"><c>call/2</c></seealso>, + <seealso marker="#cast/2"><c>cast/2</c></seealso>, or + as a normal process message, one of these functions is called. If + <seealso marker="#type-callback_mode"><em>callback mode</em></seealso> + is <c>state_functions</c>, <c>Module:StateName/3</c> is called, + and if it is <c>handle_event_function</c>, + <c>Module:handle_event/4</c> is called. + </p> + <p> + If <c>EventType</c> is + <seealso marker="#type-event_type"><c>{call,From}</c></seealso>, + the caller waits for a reply. The reply can be sent + from this or from any other + <seealso marker="#state_function">state function</seealso> + by returning with <c>{reply,From,Reply}</c> in + <seealso marker="#type-action"><c>Actions</c></seealso>, in + <seealso marker="#type-reply_action"><c>Replies</c></seealso>, + or by calling + <seealso marker="#reply/2"><c>reply(From, Reply)</c></seealso>. + </p> + <p> + If this function returns with a next state that + does not match equal (<c>=/=</c>) to the current state, + all postponed events are retried in the next state. + </p> + <p> + The only difference between <c>StateFunctionResult</c> and + <c>HandleEventResult</c> is that for <c>StateFunctionResult</c> + the next state must be an atom, but for <c>HandleEventResult</c> + there is no restriction on the next state. + </p> + <p> + For options that can be set and actions that can be done + by <c>gen_statem</c> after returning from this function, + see <seealso marker="#type-action"><c>action()</c></seealso>. + </p> + <p> + These functions can use + <seealso marker="erts:erlang#throw/1"><c>erlang:throw/1</c></seealso>, + to return the result. + </p> + </desc> + </func> + + <func> + <name>Module:terminate(Reason, State, Data) -> Ignored</name> + <fsummary>Clean up before termination.</fsummary> + <type> + <v>Reason = normal | shutdown | {shutdown,term()} | term()</v> + <v>State = <seealso marker="#type-state">state()</seealso></v> + <v>Data = <seealso marker="#type-data">data()</seealso></v> + <v>Ignored = term()</v> + </type> + <desc> + <p> + This function is called by a <c>gen_statem</c> + when it is about to terminate. It is to be the opposite of + <seealso marker="#Module:init/1"><c>Module:init/1</c></seealso> + and do any necessary cleaning up. When it returns, + the <c>gen_statem</c> terminates with <c>Reason</c>. The return + value is ignored.</p> + <p> + <c>Reason</c> is a term denoting the stop reason and + <seealso marker="#type-state"><c>State</c></seealso> + is the internal state of the <c>gen_statem</c>. + </p> + <p> + <c>Reason</c> depends on why the <c>gen_statem</c> + is terminating. + If it is because another callback function has returned, a + stop tuple <c>{stop,Reason}</c> in + <seealso marker="#type-action"><c>Actions</c></seealso>, + <c>Reason</c> has the value specified in that tuple. + If it is because of a failure, <c>Reason</c> is the error reason. + </p> + <p> + If the <c>gen_statem</c> is part of a supervision tree and is + ordered by its supervisor to terminate, this function is + called with <c>Reason = shutdown</c> if both the following + conditions apply:</p> + <list type="bulleted"> + <item> + <p> + The <c>gen_statem</c> has been set + to trap exit signals. + </p> + </item> + <item> + <p> + The shutdown strategy as defined in the supervisor's + child specification is an integer time-out value, not + <c>brutal_kill</c>. + </p> + </item> + </list> + <p> + Even if the <c>gen_statem</c> is <em>not</em> + part of a supervision tree, this function is called + if it receives an <c>'EXIT'</c> message from its parent. + <c>Reason</c> is the same as + in the <c>'EXIT'</c> message. + </p> + <p> + Otherwise, the <c>gen_statem</c> is immediately terminated. + </p> + <p> + Notice that for any other reason than <c>normal</c>, + <c>shutdown</c>, or <c>{shutdown,Term}</c>, + the <c>gen_statem</c> is assumed to terminate because of an error + and an error report is issued using + <seealso marker="kernel:error_logger#format/2"><c>error_logger:format/2</c></seealso>. + </p> + <p> + This function can use + <seealso marker="erts:erlang#throw/1"><c>erlang:throw/1</c></seealso> + to return <c>Ignored</c>, which is ignored anyway. + </p> + </desc> + </func> + </funcs> + + <section> + <title>See Also</title> + <p> + <seealso marker="gen_event"><c>gen_event(3)</c></seealso>, + <seealso marker="gen_fsm"><c>gen_fsm(3)</c></seealso>, + <seealso marker="gen_server"><c>gen_server(3)</c></seealso>, + <seealso marker="proc_lib"><c>proc_lib(3)</c></seealso>, + <seealso marker="supervisor"><c>supervisor(3)</c></seealso>, + <seealso marker="sys"><c>sys(3)</c></seealso>. + </p> + </section> +</erlref> diff --git a/lib/stdlib/doc/src/io.xml b/lib/stdlib/doc/src/io.xml index 4655c8662f..9ae50ed90c 100644 --- a/lib/stdlib/doc/src/io.xml +++ b/lib/stdlib/doc/src/io.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>1996</year><year>2013</year> + <year>1996</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/io_lib.xml b/lib/stdlib/doc/src/io_lib.xml index cd58090dcd..b22ec15a0c 100644 --- a/lib/stdlib/doc/src/io_lib.xml +++ b/lib/stdlib/doc/src/io_lib.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>1996</year><year>2014</year> + <year>1996</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/io_protocol.xml b/lib/stdlib/doc/src/io_protocol.xml index 170dab17ca..f2a669a49a 100644 --- a/lib/stdlib/doc/src/io_protocol.xml +++ b/lib/stdlib/doc/src/io_protocol.xml @@ -5,7 +5,7 @@ <header> <copyright> <year>1999</year> - <year>2013</year> + <year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/lib.xml b/lib/stdlib/doc/src/lib.xml index f4dddf646d..ac41987eaf 100644 --- a/lib/stdlib/doc/src/lib.xml +++ b/lib/stdlib/doc/src/lib.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>1996</year><year>2013</year> + <year>1996</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/lists.xml b/lib/stdlib/doc/src/lists.xml index 89ba5238b5..03d0063599 100644 --- a/lib/stdlib/doc/src/lists.xml +++ b/lib/stdlib/doc/src/lists.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>1996</year><year>2013</year> + <year>1996</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> @@ -262,6 +262,21 @@ flatmap(Fun, List1) -> </desc> </func> <func> + <name name="join" arity="2"/> + <fsummary>Insert an element between elements in a list</fsummary> + <desc> + <p>Inserts <c><anno>Sep</anno></c> between each element in <c><anno>List1</anno></c>. Has no + effect on the empty list and on a singleton list. For example:</p> + <pre> +> <input>lists:join(x, [a,b,c]).</input> +[a,x,b,x,c] +> <input>lists:join(x, [a]).</input> +[a] +> <input>lists:join(x, []).</input> +[]</pre> + </desc> + </func> + <func> <name name="foreach" arity="2"/> <fsummary>Apply a function to each element of a list</fsummary> <desc> diff --git a/lib/stdlib/doc/src/log_mf_h.xml b/lib/stdlib/doc/src/log_mf_h.xml index eccda516ba..65622e52f5 100644 --- a/lib/stdlib/doc/src/log_mf_h.xml +++ b/lib/stdlib/doc/src/log_mf_h.xml @@ -5,7 +5,7 @@ <header> <copyright> <year>1996</year> - <year>2013</year> + <year>2016</year> <holder>Ericsson AB, All Rights Reserved</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/maps.xml b/lib/stdlib/doc/src/maps.xml index 48c1abc2f8..bf45461e2b 100644 --- a/lib/stdlib/doc/src/maps.xml +++ b/lib/stdlib/doc/src/maps.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>2013</year><year>2014</year> + <year>2013</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> @@ -301,6 +301,30 @@ false</code> </func> <func> + <name name="take" arity="2"/> + <fsummary></fsummary> + <desc> + <p> + The function removes the <c><anno>Key</anno></c>, if it exists, and its associated value from + <c><anno>Map1</anno></c> and returns a tuple with the removed <c><anno>Value</anno></c> and + the new map <c><anno>Map2</anno></c> without key <c><anno>Key</anno></c>. + If the key does not exist <c>error</c> is returned. + </p> + <p> + The call will fail with a <c>{badmap,Map}</c> exception if <c><anno>Map1</anno></c> is not a map. + </p> + <p>Example:</p> + <code type="none"> +> Map = #{"a" => "hello", "b" => "world"}. +#{"a" => "hello", "b" => "world"} +> maps:take("a",Map). +{"hello",#{"b" => "world"}} +> maps:take("does not exist",Map). +error</code> + </desc> + </func> + + <func> <name name="size" arity="1"/> <fsummary></fsummary> <desc> @@ -357,6 +381,42 @@ false</code> </desc> </func> + <func> + <name name="update_with" arity="3"/> + <fsummary></fsummary> + <desc> + <p>Update a value in a <c><anno>Map1</anno></c> associated with <c><anno>Key</anno></c> by + calling <c><anno>Fun</anno></c> on the old value to get a new value. An exception + <c>{badkey,<anno>Key</anno>}</c> is generated if + <c><anno>Key</anno></c> is not present in the map.</p> + <p>Example:</p> + <code type="none"> +> Map = #{"counter" => 1}, + Fun = fun(V) -> V + 1 end, + maps:update_with("counter",Fun,Map). +#{"counter" => 2}</code> + </desc> + </func> + + <func> + <name name="update_with" arity="4"/> + <fsummary></fsummary> + <desc> + <p>Update a value in a <c><anno>Map1</anno></c> associated with <c><anno>Key</anno></c> by + calling <c><anno>Fun</anno></c> on the old value to get a new value. + If <c><anno>Key</anno></c> is not present + in <c><anno>Map1</anno></c> then <c><anno>Init</anno></c> will be associated with + <c><anno>Key</anno></c>. + </p> + <p>Example:</p> + <code type="none"> +> Map = #{"counter" => 1}, + Fun = fun(V) -> V + 1 end, + maps:update_with("new counter",Fun,42,Map). +#{"counter" => 1,"new counter" => 42}</code> + </desc> + </func> + <func> <name name="values" arity="1"/> <fsummary></fsummary> diff --git a/lib/stdlib/doc/src/math.xml b/lib/stdlib/doc/src/math.xml index aee6c3f238..38084638f6 100644 --- a/lib/stdlib/doc/src/math.xml +++ b/lib/stdlib/doc/src/math.xml @@ -5,7 +5,7 @@ <header> <copyright> <year>1996</year> - <year>2013</year> + <year>2016</year> <holder>Ericsson AB, All Rights Reserved</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/ms_transform.xml b/lib/stdlib/doc/src/ms_transform.xml index 22cb39c576..84712486ea 100644 --- a/lib/stdlib/doc/src/ms_transform.xml +++ b/lib/stdlib/doc/src/ms_transform.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>2002</year><year>2013</year> + <year>2002</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/notes.xml b/lib/stdlib/doc/src/notes.xml index 267a993a1b..87f5335723 100644 --- a/lib/stdlib/doc/src/notes.xml +++ b/lib/stdlib/doc/src/notes.xml @@ -4,7 +4,7 @@ <chapter> <header> <copyright> - <year>2004</year><year>2013</year> + <year>2004</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> @@ -31,6 +31,93 @@ </header> <p>This document describes the changes made to the STDLIB application.</p> +<section><title>STDLIB 2.8</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p> + Fix evaluation in matching of bound map key variables in + the interpreter.</p> + <p> + Prior to this patch, the following code would not + evaluate: <c>X = key,(fun(#{X := value}) -> true + end)(#{X => value})</c></p> + <p> + Own Id: OTP-13218</p> + </item> + <item> + <p> Fix <c>erl_eval</c> not using non-local function + handler. </p> + <p> + Own Id: OTP-13228 Aux Id: ERL-32 </p> + </item> + <item> + <p> The Erlang Code Linter no longer crashes if there is + a <c>-deprecated()</c> attribute but no <c>-module()</c> + declaration. </p> + <p> + Own Id: OTP-13230 Aux Id: ERL-62 </p> + </item> + <item> + <p> + The timestamp in the result returned by <c>dets:info(Tab, + safe_fixed)</c> was unintentionally broken as a result of + the time API rewrites in OTP 18.0. This has now been + fixed.</p> + <p> + Own Id: OTP-13239 Aux Id: OTP-11997 </p> + </item> + <item> + <p>A rare race condition in <c>beam_lib</c> when using + encrypted abstract format has been eliminated.</p> + <p> + Own Id: OTP-13278</p> + </item> + <item> + <p> + Improved maps:with/2 and maps:without/2 algorithms</p> + <p> + The new implementation speeds up the execution + significantly for all sizes of input.</p> + <p> + Own Id: OTP-13376</p> + </item> + </list> + </section> + + + <section><title>Improvements and New Features</title> + <list> + <item> + <p> + Time warp safety improvements.</p> + <p> + Introduced the options <c>monotonic_timestamp</c>, and + <c>strict_monotonic_timestamp</c> to the trace, + sequential trace, and system profile functionality. This + since the already existing <c>timestamp</c> option is not + time warp safe.</p> + <p> + Introduced the option <c>safe_fixed_monotonic_time</c> to + <c>ets:info/2</c> and <c>dets:info/2</c>. This since the + already existing <c>safe_fixed</c> option is not time + warp safe.</p> + <p> + Own Id: OTP-13222 Aux Id: OTP-11997 </p> + </item> + <item> + <p> + In the shell Ctrl+W (delete word) will no longer consider + "." as being part of a word.</p> + <p> + Own Id: OTP-13281</p> + </item> + </list> + </section> + +</section> + <section><title>STDLIB 2.7</title> <section><title>Fixed Bugs and Malfunctions</title> diff --git a/lib/stdlib/doc/src/notes_history.xml b/lib/stdlib/doc/src/notes_history.xml index 25641fdf3a..efcb5ac7df 100644 --- a/lib/stdlib/doc/src/notes_history.xml +++ b/lib/stdlib/doc/src/notes_history.xml @@ -4,7 +4,7 @@ <chapter> <header> <copyright> - <year>2006</year><year>2013</year> + <year>2006</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/ordsets.xml b/lib/stdlib/doc/src/ordsets.xml index 639e041d79..0d5d618b66 100644 --- a/lib/stdlib/doc/src/ordsets.xml +++ b/lib/stdlib/doc/src/ordsets.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>1996</year><year>2013</year> + <year>1996</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/part.xml b/lib/stdlib/doc/src/part.xml index f7074d3404..15b7bd4a1d 100644 --- a/lib/stdlib/doc/src/part.xml +++ b/lib/stdlib/doc/src/part.xml @@ -5,7 +5,7 @@ <header> <copyright> <year>1996</year> - <year>2013</year> + <year>2016</year> <holder>Ericsson AB, All Rights Reserved</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/part_notes.xml b/lib/stdlib/doc/src/part_notes.xml index 6ceead1af5..461de749dd 100644 --- a/lib/stdlib/doc/src/part_notes.xml +++ b/lib/stdlib/doc/src/part_notes.xml @@ -4,7 +4,7 @@ <part xmlns:xi="http://www.w3.org/2001/XInclude"> <header> <copyright> - <year>2004</year><year>2013</year> + <year>2004</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/part_notes_history.xml b/lib/stdlib/doc/src/part_notes_history.xml index 36792b12e1..8fd048a41e 100644 --- a/lib/stdlib/doc/src/part_notes_history.xml +++ b/lib/stdlib/doc/src/part_notes_history.xml @@ -5,7 +5,7 @@ <header> <copyright> <year>2006</year> - <year>2013</year> + <year>2016</year> <holder>Ericsson AB, All Rights Reserved</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/pool.xml b/lib/stdlib/doc/src/pool.xml index e9c574038c..d217d071da 100644 --- a/lib/stdlib/doc/src/pool.xml +++ b/lib/stdlib/doc/src/pool.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>1996</year><year>2013</year> + <year>1996</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/proc_lib.xml b/lib/stdlib/doc/src/proc_lib.xml index 85f0c0c908..f02b1f0651 100644 --- a/lib/stdlib/doc/src/proc_lib.xml +++ b/lib/stdlib/doc/src/proc_lib.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>1996</year><year>2014</year> + <year>1996</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> @@ -34,9 +34,9 @@ <p>This module is used to start processes adhering to the <seealso marker="doc/design_principles:des_princ">OTP Design Principles</seealso>. Specifically, the functions in this module are used by the OTP standard behaviors (<c>gen_server</c>, - <c>gen_fsm</c>, ...) when starting new processes. The functions - can also be used to start <em>special processes</em>, user - defined processes which comply to the OTP design principles. See + <c>gen_fsm</c>, <c>gen_statem</c>, ...) when starting new processes. + The functions can also be used to start <em>special processes</em>, + user defined processes which comply to the OTP design principles. See <seealso marker="doc/design_principles:spec_proc">Sys and Proc_Lib</seealso> in OTP Design Principles for an example.</p> <p>Some useful information is initialized when a process starts. The registered names, or the process identifiers, of the parent @@ -73,6 +73,13 @@ <name name="priority_level"/> </datatype> <datatype> + <name name="max_heap_size"/> + <desc> + <p>See <seealso marker="erts:erlang#process_flag_max_heap_size"> + erlang:process_flag(max_heap_size, MaxHeapSize)</seealso>.</p> + </desc> + </datatype> + <datatype> <name name="dict_or_pid"/> </datatype> </datatypes> diff --git a/lib/stdlib/doc/src/proplists.xml b/lib/stdlib/doc/src/proplists.xml index de4fbd3a7f..832df9556a 100644 --- a/lib/stdlib/doc/src/proplists.xml +++ b/lib/stdlib/doc/src/proplists.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>2002</year><year>2013</year> + <year>2002</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/qlc.xml b/lib/stdlib/doc/src/qlc.xml index 8101b6458c..2966e94ec1 100644 --- a/lib/stdlib/doc/src/qlc.xml +++ b/lib/stdlib/doc/src/qlc.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>2004</year><year>2013</year> + <year>2004</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/queue.xml b/lib/stdlib/doc/src/queue.xml index c1665a1ed4..e1a96f5c65 100644 --- a/lib/stdlib/doc/src/queue.xml +++ b/lib/stdlib/doc/src/queue.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>1996</year><year>2014</year> + <year>1996</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/random.xml b/lib/stdlib/doc/src/random.xml index fc4f796863..dea4e43c95 100644 --- a/lib/stdlib/doc/src/random.xml +++ b/lib/stdlib/doc/src/random.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>1996</year><year>2013</year> + <year>1996</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/re.xml b/lib/stdlib/doc/src/re.xml index 8c19926b10..fda79d51d5 100644 --- a/lib/stdlib/doc/src/re.xml +++ b/lib/stdlib/doc/src/re.xml @@ -5,7 +5,7 @@ <header> <copyright> <year>2007</year> - <year>2013</year> + <year>2016</year> <holder>Ericsson AB, All Rights Reserved</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/ref_man.xml b/lib/stdlib/doc/src/ref_man.xml index 82ad78e675..404873ea32 100644 --- a/lib/stdlib/doc/src/ref_man.xml +++ b/lib/stdlib/doc/src/ref_man.xml @@ -4,7 +4,7 @@ <application xmlns:xi="http://www.w3.org/2001/XInclude"> <header> <copyright> - <year>1996</year><year>2015</year> + <year>1996</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> @@ -66,6 +66,7 @@ <xi:include href="gen_event.xml"/> <xi:include href="gen_fsm.xml"/> <xi:include href="gen_server.xml"/> + <xi:include href="gen_statem.xml"/> <xi:include href="io.xml"/> <xi:include href="io_lib.xml"/> <xi:include href="lib.xml"/> diff --git a/lib/stdlib/doc/src/shell.xml b/lib/stdlib/doc/src/shell.xml index 22a3321298..65c441203c 100644 --- a/lib/stdlib/doc/src/shell.xml +++ b/lib/stdlib/doc/src/shell.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>1996</year><year>2013</year> + <year>1996</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/shell_default.xml b/lib/stdlib/doc/src/shell_default.xml index 51cd3b62d3..4a90b7d7cc 100644 --- a/lib/stdlib/doc/src/shell_default.xml +++ b/lib/stdlib/doc/src/shell_default.xml @@ -5,7 +5,7 @@ <header> <copyright> <year>1996</year> - <year>2013</year> + <year>2016</year> <holder>Ericsson AB, All Rights Reserved</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/slave.xml b/lib/stdlib/doc/src/slave.xml index 8c16cbf5b1..244822568b 100644 --- a/lib/stdlib/doc/src/slave.xml +++ b/lib/stdlib/doc/src/slave.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>1996</year><year>2013</year> + <year>1996</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/sofs.xml b/lib/stdlib/doc/src/sofs.xml index 53f6ca957a..1e5be367bd 100644 --- a/lib/stdlib/doc/src/sofs.xml +++ b/lib/stdlib/doc/src/sofs.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>2001</year><year>2013</year> + <year>2001</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> @@ -399,8 +399,7 @@ fun(S) -> sofs:partition(1, S) end <datatype> <!-- Parameterized opaque types are NYI: --> <name>tuple_of(T)</name> - <desc><p><marker id="type-tuple_of"/> - A tuple where the elements are of type <c>T</c>.</p></desc> + <desc><p>A tuple where the elements are of type <c>T</c>.</p></desc> </datatype> </datatypes> <funcs> diff --git a/lib/stdlib/doc/src/specs.xml b/lib/stdlib/doc/src/specs.xml index 0418bf7b22..45b207b13d 100644 --- a/lib/stdlib/doc/src/specs.xml +++ b/lib/stdlib/doc/src/specs.xml @@ -30,6 +30,7 @@ <xi:include href="../specs/specs_gen_event.xml"/> <xi:include href="../specs/specs_gen_fsm.xml"/> <xi:include href="../specs/specs_gen_server.xml"/> + <xi:include href="../specs/specs_gen_statem.xml"/> <xi:include href="../specs/specs_io.xml"/> <xi:include href="../specs/specs_io_lib.xml"/> <xi:include href="../specs/specs_lib.xml"/> diff --git a/lib/stdlib/doc/src/stdlib_app.xml b/lib/stdlib/doc/src/stdlib_app.xml index 43bcad9098..5508be9c5d 100644 --- a/lib/stdlib/doc/src/stdlib_app.xml +++ b/lib/stdlib/doc/src/stdlib_app.xml @@ -4,7 +4,7 @@ <appref> <header> <copyright> - <year>2005</year><year>2013</year> + <year>2005</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/string.xml b/lib/stdlib/doc/src/string.xml index d64db6c7ee..a9ecb60244 100644 --- a/lib/stdlib/doc/src/string.xml +++ b/lib/stdlib/doc/src/string.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>1996</year><year>2014</year> + <year>1996</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/supervisor.xml b/lib/stdlib/doc/src/supervisor.xml index 24ff251ce3..29e5a732d5 100644 --- a/lib/stdlib/doc/src/supervisor.xml +++ b/lib/stdlib/doc/src/supervisor.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>1996</year><year>2014</year> + <year>1996</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> @@ -34,8 +34,8 @@ <p>A behaviour module for implementing a supervisor, a process which supervises other processes called child processes. A child process can either be another supervisor or a worker process. - Worker processes are normally implemented using one of - the <c>gen_event</c>, <c>gen_fsm</c>, or <c>gen_server</c> + Worker processes are normally implemented using one of the + <c>gen_event</c>, <c>gen_fsm</c>, <c>gen_statem</c> or <c>gen_server</c> behaviours. A supervisor implemented using this module will have a standard set of interface functions and include functionality for tracing and error reporting. Supervisors are used to build a @@ -221,7 +221,8 @@ <p><c>modules</c> is used by the release handler during code replacement to determine which processes are using a certain module. As a rule of thumb, if the child process is a - <c>supervisor</c>, <c>gen_server</c>, or <c>gen_fsm</c>, + <c>supervisor</c>, <c>gen_server</c>, + <c>gen_fsm</c> or <c>gen_statem</c> this should be a list with one element <c>[Module]</c>, where <c>Module</c> is the callback module. If the child process is an event manager (<c>gen_event</c>) with a @@ -543,7 +544,10 @@ </item> <item> <p><c>active</c> - the count of all actively running child processes - managed by this supervisor.</p> + managed by this supervisor. In the case of <c>simple_one_for_one</c> + supervisors, no check is carried out to ensure that each child process + is still alive, though the result provided here is likely to be very + accurate unless the supervisor is heavily overloaded.</p> </item> <item> <p><c>supervisors</c> - the count of all children marked as @@ -633,6 +637,7 @@ <title>SEE ALSO</title> <p><seealso marker="gen_event">gen_event(3)</seealso>, <seealso marker="gen_fsm">gen_fsm(3)</seealso>, + <seealso marker="gen_statem">gen_statem(3)</seealso>, <seealso marker="gen_server">gen_server(3)</seealso>, <seealso marker="sys">sys(3)</seealso></p> </section> diff --git a/lib/stdlib/doc/src/supervisor_bridge.xml b/lib/stdlib/doc/src/supervisor_bridge.xml index d356b4b57e..e40c8bbd6f 100644 --- a/lib/stdlib/doc/src/supervisor_bridge.xml +++ b/lib/stdlib/doc/src/supervisor_bridge.xml @@ -5,7 +5,7 @@ <header> <copyright> <year>1996</year> - <year>2013</year> + <year>2016</year> <holder>Ericsson AB, All Rights Reserved</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/sys.xml b/lib/stdlib/doc/src/sys.xml index d400f72e1d..2255395f46 100644 --- a/lib/stdlib/doc/src/sys.xml +++ b/lib/stdlib/doc/src/sys.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>1996</year><year>2014</year> + <year>1996</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> @@ -217,14 +217,18 @@ processes. For example, a <c>gen_server</c> process returns the callback module's state, a <c>gen_fsm</c> process returns information such as its current state name and state data, - and a <c>gen_event</c> process returns information about each of its + a <c>gen_statem</c> process returns information about + its current state and data, and a <c>gen_event</c> process + returns information about each of its registered handlers. Callback modules for <c>gen_server</c>, - <c>gen_fsm</c>, and <c>gen_event</c> can also customise the value + <c>gen_fsm</c>, <c>gen_statem</c> and <c>gen_event</c> + can also customise the value of <c><anno>Misc</anno></c> by exporting a <c>format_status/2</c> function that contributes module-specific information; - see <seealso marker="gen_server#Module:format_status/2">gen_server:format_status/2</seealso>, - <seealso marker="gen_fsm#Module:format_status/2">gen_fsm:format_status/2</seealso>, and - <seealso marker="gen_event#Module:format_status/2">gen_event:format_status/2</seealso> + see <seealso marker="gen_server#Module:format_status/2">gen_server format_status/2</seealso>, + <seealso marker="gen_fsm#Module:format_status/2">gen_fsm format_status/2</seealso>, + <seealso marker="gen_statem#Module:format_status/2">gen_statem format_status/2</seealso>, and + <seealso marker="gen_event#Module:format_status/2">gen_event format_status/2</seealso> for more details.</p> </desc> </func> @@ -245,6 +249,8 @@ processes. For a <c>gen_server</c> process, the returned <c><anno>State</anno></c> is simply the callback module's state. For a <c>gen_fsm</c> process, <c><anno>State</anno></c> is the tuple <c>{CurrentStateName, CurrentStateData}</c>. + For a <c>gen_statem</c> process <c><anno>State</anno></c> is + the tuple <c>{CurrentState,CurrentData}.</c> For a <c>gen_event</c> process, <c><anno>State</anno></c> a list of tuples, where each tuple corresponds to an event handler registered in the process and contains <c>{Module, Id, HandlerState}</c>, where <c>Module</c> is the event handler's module name, @@ -263,8 +269,9 @@ details of the exception.</p> <p>The <c>system_get_state/1</c> function is primarily useful for user-defined behaviours and modules that implement OTP <seealso marker="#special_process">special - processes</seealso>. The <c>gen_server</c>, <c>gen_fsm</c>, and <c>gen_event</c> OTP - behaviour modules export this function, and so callback modules for those behaviours + processes</seealso>. The <c>gen_server</c>, <c>gen_fsm</c>, + <c>gen_statem</c> and <c>gen_event</c> OTP + behaviour modules export this function, so callback modules for those behaviours need not supply their own.</p> <p>To obtain more information about a process, including its state, see <seealso marker="#get_status-1">get_status/1</seealso> and @@ -290,6 +297,8 @@ <c>gen_fsm</c> process, <c><anno>State</anno></c> is the tuple <c>{CurrentStateName, CurrentStateData}</c>, and <c><anno>NewState</anno></c> is a similar tuple that may contain a new state name, new state data, or both. + The same applies for a <c>gen_statem</c> process but + it names the tuple fields <c>{CurrentState,CurrentData}</c>. For a <c>gen_event</c> process, <c><anno>State</anno></c> is the tuple <c>{Module, Id, HandlerState}</c> where <c>Module</c> is the event handler's module name, <c>Id</c> is the handler's ID (which is the value <c>false</c> if it was registered without @@ -304,7 +313,8 @@ state, then regardless of process type, it may simply return its <c><anno>State</anno></c> argument.</p> <p>If a <c><anno>StateFun</anno></c> function crashes or throws an exception, then - for <c>gen_server</c> and <c>gen_fsm</c> processes, the original state of the process is + for <c>gen_server</c>, <c>gen_fsm</c> or <c>gen_statem</c> processes, + the original state of the process is unchanged. For <c>gen_event</c> processes, a crashing or failing <c><anno>StateFun</anno></c> function means that only the state of the particular event handler it was working on when it failed or crashed is unchanged; it can still succeed in changing the states of other event @@ -329,7 +339,8 @@ <c>{callback_failed, StateFun, {Class, Reason}}</c>.</p> <p>The <c>system_replace_state/2</c> function is primarily useful for user-defined behaviours and modules that implement OTP <seealso marker="#special_process">special processes</seealso>. The - <c>gen_server</c>, <c>gen_fsm</c>, and <c>gen_event</c> OTP behaviour modules export this function, + <c>gen_server</c>, <c>gen_fsm</c>, <c>gen_statem</c> and + <c>gen_event</c> OTP behaviour modules export this function, and so callback modules for those behaviours need not supply their own.</p> </desc> </func> diff --git a/lib/stdlib/doc/src/timer.xml b/lib/stdlib/doc/src/timer.xml index 7609487300..4f259d57a8 100644 --- a/lib/stdlib/doc/src/timer.xml +++ b/lib/stdlib/doc/src/timer.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>1996</year><year>2013</year> + <year>1996</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/unicode.xml b/lib/stdlib/doc/src/unicode.xml index 966eec49f5..edc6830cb5 100644 --- a/lib/stdlib/doc/src/unicode.xml +++ b/lib/stdlib/doc/src/unicode.xml @@ -5,7 +5,7 @@ <header> <copyright> <year>1996</year> - <year>2013</year> + <year>2016</year> <holder>Ericsson AB, All Rights Reserved</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/unicode_usage.xml b/lib/stdlib/doc/src/unicode_usage.xml index c4cb193b07..b4c9385e33 100644 --- a/lib/stdlib/doc/src/unicode_usage.xml +++ b/lib/stdlib/doc/src/unicode_usage.xml @@ -5,7 +5,7 @@ <header> <copyright> <year>1999</year> - <year>2014</year> + <year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/win32reg.xml b/lib/stdlib/doc/src/win32reg.xml index 2a5a4a462d..52a8942c59 100644 --- a/lib/stdlib/doc/src/win32reg.xml +++ b/lib/stdlib/doc/src/win32reg.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>2000</year><year>2013</year> + <year>2000</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> diff --git a/lib/stdlib/doc/src/zip.xml b/lib/stdlib/doc/src/zip.xml index 186c8ac724..09a6587583 100644 --- a/lib/stdlib/doc/src/zip.xml +++ b/lib/stdlib/doc/src/zip.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>2006</year><year>2013</year> + <year>2006</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> |