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-rw-r--r--erts/doc/src/absform.xml2
-rw-r--r--erts/doc/src/erl.xml18
-rw-r--r--erts/doc/src/erl_ext_dist.xml15
-rw-r--r--erts/doc/src/erl_nif.xml112
-rw-r--r--erts/doc/src/erl_tracer.xml4
-rw-r--r--erts/doc/src/erlang.xml285
-rw-r--r--erts/doc/src/erts_alloc.xml2
-rw-r--r--erts/doc/src/notes.xml14
-rw-r--r--erts/doc/src/zlib.xml12
9 files changed, 252 insertions, 212 deletions
diff --git a/erts/doc/src/absform.xml b/erts/doc/src/absform.xml
index ab00d47425..fe8e3b30e7 100644
--- a/erts/doc/src/absform.xml
+++ b/erts/doc/src/absform.xml
@@ -886,7 +886,7 @@
Rep(Fc) = <c>[Rep(C_1), ..., Rep(C_k)]</c>.</p>
<list type="bulleted">
- <item>If C is a constraint <c>is_subtype(V, T)</c> or <c>V :: T</c>,
+ <item>If C is a constraint <c>V :: T</c>,
where <c>V</c> is a type variable
and <c>T</c> is a type, then Rep(C) =
<c>{type,LINE,constraint,[{atom,LINE,is_subtype},[Rep(V),Rep(T)]]}</c>.
diff --git a/erts/doc/src/erl.xml b/erts/doc/src/erl.xml
index 8da832ac37..29fef7348b 100644
--- a/erts/doc/src/erl.xml
+++ b/erts/doc/src/erl.xml
@@ -638,7 +638,7 @@
this value also applies to command-line parameters and environment
variables (see section <seealso
marker="stdlib:unicode_usage#unicode_in_environment_and_parameters">
- Unicode in Enviroment and Parameters</seealso> in the STDLIB
+ Unicode in Environment and Parameters</seealso> in the STDLIB
User's Guide).</p>
</item>
<tag><c><![CDATA[+fnu[{w|i|e}]]]></c></tag>
@@ -674,7 +674,7 @@
this value also applies to command-line parameters and environment
variables (see section <seealso
marker="stdlib:unicode_usage#unicode_in_environment_and_parameters">
- Unicode in Enviroment and Parameters</seealso> in the STDLIB
+ Unicode in Environment and Parameters</seealso> in the STDLIB
User's Guide).</p>
</item>
<tag><c><![CDATA[+fna[{w|i|e}]]]></c></tag>
@@ -695,7 +695,7 @@
this value also applies to command-line parameters and environment
variables (see section <seealso
marker="stdlib:unicode_usage#unicode_in_environment_and_parameters">
- Unicode in Enviroment and Parameters</seealso> in the STDLIB
+ Unicode in Environment and Parameters</seealso> in the STDLIB
User's Guide).</p>
</item>
<tag><c><![CDATA[+hms Size]]></c></tag>
@@ -946,9 +946,7 @@
schedulers was allowed to be unlimited, dirty CPU bound jobs would
potentially starve normal jobs.</p>
<p>This option is ignored if the emulator does not have threading
- support enabled. <em>This option is experimental</em> and
- is supported only if the emulator was configured and built with
- support for dirty schedulers enabled (it is disabled by default).</p>
+ support enabled.</p>
</item>
<tag><marker id="+SDPcpu"/><c><![CDATA[+SDPcpu
DirtyCPUSchedulersPercentage:DirtyCPUSchedulersOnlinePercentage]]></c></tag>
@@ -974,9 +972,7 @@
either order) results in 2 dirty CPU scheduler threads (50% of 4) and
1 dirty CPU scheduler thread online (25% of 4).</p>
<p>This option is ignored if the emulator does not have threading
- support enabled. <em>This option is experimental</em> and
- is supported only if the emulator was configured and built with
- support for dirty schedulers enabled (it is disabled by default).</p>
+ support enabled.</p>
</item>
<tag><marker id="+SDio"/><c><![CDATA[+SDio DirtyIOSchedulers]]></c></tag>
<item>
@@ -992,9 +988,7 @@
bound jobs on dirty I/O schedulers, these jobs might starve ordinary
jobs executing on ordinary schedulers.</p>
<p>This option is ignored if the emulator does not have threading
- support enabled. <em>This option is experimental</em> and
- is supported only if the emulator was configured and built with
- support for dirty schedulers enabled (it is disabled by default).</p>
+ support enabled.</p>
</item>
<tag><c><![CDATA[+sFlag Value]]></c></tag>
<item>
diff --git a/erts/doc/src/erl_ext_dist.xml b/erts/doc/src/erl_ext_dist.xml
index 4f799f8f34..a436a9ca74 100644
--- a/erts/doc/src/erl_ext_dist.xml
+++ b/erts/doc/src/erl_ext_dist.xml
@@ -119,16 +119,11 @@
<tcaption>Compressed Data Format when Expanded</tcaption></table>
<marker id="utf8_atoms"/>
<note>
- <p>As from ERTS 5.10 (OTP R16) support
- for UTF-8 encoded atoms has been introduced in the external format.
- However, only characters that can be encoded using Latin-1 (ISO-8859-1)
- are currently supported in atoms. The support for UTF-8 encoded atoms
- in the external format has been implemented to be able to support
- all Unicode characters in atoms in <em>some future release</em>.
- Until full Unicode support for atoms has been introduced,
- it is an <em>error</em> to pass atoms containing
- characters that cannot be encoded in Latin-1, and <em>the behavior is
- undefined</em>.</p>
+ <p>As from ERTS 9.0 (OTP 20), UTF-8 encoded atoms may contain any Unicode
+ character. Although the support for UTF-8 encoded atoms in the external
+ format is available since ERTS 5.10 (OTP R16), passing atoms that cannot
+ be encoded in Latin-1 is an <em>error</em> in versions earlier than
+ Erlang/OTP 20, and <em>the behavior is undefined</em>.</p>
<p>When distribution flag <seealso marker="erl_dist_protocol#dflags">
<c>DFLAG_UTF8_ATOMS</c></seealso> has been exchanged between both nodes
in the <seealso marker="erl_dist_protocol#distribution_handshake">
diff --git a/erts/doc/src/erl_nif.xml b/erts/doc/src/erl_nif.xml
index b5dc9037c4..74a551d60b 100644
--- a/erts/doc/src/erl_nif.xml
+++ b/erts/doc/src/erl_nif.xml
@@ -80,7 +80,7 @@
<code type="none">
/* niftest.c */
-#include "erl_nif.h"
+#include &lt;erl_nif.h&gt;
static ERL_NIF_TERM hello(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{
@@ -123,7 +123,7 @@ ok
"Hello world!"</code>
<p>A better solution for a real module is to take advantage of the new
- directive <c>on load</c> (see section
+ directive <c>on_load</c> (see section
<seealso marker="doc/reference_manual:code_loading#on_load">Running a
Function When a Module is Loaded</seealso> in the Erlang Reference
Manual) to load the NIF library automatically when the module is
@@ -135,27 +135,14 @@ ok
away by the compiler, causing loading of the NIF library to fail.</p>
</note>
- <p>A loaded NIF library is tied to the Erlang module code version
- that loaded it. If the module is upgraded with a new version, the
- new Erlang code need to load its own NIF library (or maybe choose not
- to). The new code version can, however, choose to load the
- same NIF library as the old code if it wants to. Sharing the
- dynamic library means that static data defined by the library
- is shared as well. To avoid unintentionally shared static
- data, each Erlang module code can keep its own private data. This
- private data can be set when the NIF library is loaded and
- then retrieved by calling <seealso marker="#enif_priv_data">
- <c>enif_priv_data</c></seealso>.</p>
-
- <p>A NIF library cannot be loaded explicitly. A library is
- automatically unloaded when the module code that it belongs to is purged
- by the code server.</p>
+ <p>Once loaded, a NIF library is persistent. It will not be unloaded
+ until the module code version that it belongs to is purged.</p>
</description>
<section>
<title>Functionality</title>
- <p>All functions that a NIF library needs to do with Erlang are
- performed through the NIF API functions. Functions exist
+ <p>All interaction between NIF code and the Erlang runtime system is
+ performed by calling NIF API functions. Functions exist
for the following functionality:</p>
<taglist>
@@ -286,6 +273,19 @@ return term;</code>
library is postponed as long as there exist resource objects with a
destructor function in the library.</p>
</item>
+ <tag>Module upgrade and static data</tag>
+ <item>
+ <p>A loaded NIF library is tied to the Erlang module instance
+ that loaded it. If the module is upgraded, the new module instance
+ needs to load its own NIF library (or maybe choose not to). The new
+ module instance can, however, choose to load the exact same NIF library
+ as the old code if it wants to. Sharing the dynamic library means that
+ static data defined by the library is shared as well. To avoid
+ unintentionally shared static data between module instances, each Erlang
+ module version can keep its own private data. This private data can be
+ set when the NIF library is loaded and later retrieved by calling
+ <seealso marker="#enif_priv_data"><c>enif_priv_data</c></seealso>.</p>
+ </item>
<tag>Threads and concurrency</tag>
<item>
<p>A NIF is thread-safe without any explicit synchronization as
@@ -296,8 +296,8 @@ return term;</code>
synchronization. This includes terms in process-independent
environments that are shared between threads. Resource objects also
require synchronization if you treat them as mutable.</p>
- <p>The library initialization callbacks <c>load</c>, <c>reload</c>, and
- <c>upgrade</c> are all thread-safe even for shared state data.</p>
+ <p>The library initialization callbacks <c>load</c> and
+ <c>upgrade</c> are thread-safe even for shared state data.</p>
</item>
<tag><marker id="version_management"/>Version Management</tag>
<item>
@@ -402,14 +402,14 @@ return term;</code>
<tag><marker id="dirty_nifs"/>Dirty NIF</tag>
<item>
<note>
- <p><em>The dirty NIF functionality described here
- is experimental</em>. Dirty NIF support is available only when
- the emulator is configured with dirty schedulers enabled. This
- feature is disabled by default. The Erlang runtime
- without SMP support does not support dirty schedulers even when
- the dirty scheduler support is enabled. To check at runtime for
- the presence of dirty scheduler threads, code can use the
- <seealso marker="#enif_system_info">
+ <p>Dirty NIF support is available only when the emulator is
+ configured with dirty scheduler support. As of ERTS version
+ 9.0, dirty scheduler support is enabled by default on the
+ runtime system with SMP support. The Erlang runtime without
+ SMP support does <em>not</em> support dirty schedulers even
+ when the dirty scheduler support is explicitly enabled. To
+ check at runtime for the presence of dirty scheduler threads,
+ code can use the <seealso marker="#enif_system_info">
<c>enif_system_info()</c></seealso> API function.</p>
</note>
<p>A NIF that cannot be split and cannot execute in a millisecond
@@ -498,7 +498,7 @@ return term;</code>
<title>Initialization</title>
<taglist>
<tag><marker id="ERL_NIF_INIT"/><c>ERL_NIF_INIT(MODULE,
- ErlNifFunc funcs[], load, reload, upgrade, unload)</c></tag>
+ ErlNifFunc funcs[], load, NULL, upgrade, unload)</c></tag>
<item>
<p>This is the magic macro to initialize a NIF library. It
is to be evaluated in global file scope.</p>
@@ -507,11 +507,14 @@ return term;</code>
the macro.</p>
<p><c>funcs</c> is a static array of function descriptors for
all the implemented NIFs in this library.</p>
- <p><c>load</c>, <c>reload</c>, <c>upgrade</c> and <c>unload</c>
- are pointers to functions. One of <c>load</c>, <c>reload</c>, or
+ <p><c>load</c>, <c>upgrade</c> and <c>unload</c>
+ are pointers to functions. One of <c>load</c> or
<c>upgrade</c> is called to initialize the library.
<c>unload</c> is called to release the library. All are
described individually below.</p>
+ <p>The fourth argument <c>NULL</c> is ignored. It
+ was earlier used for the deprectated <c>reload</c> callback
+ which is no longer supported since OTP 20.</p>
<p>If compiling a NIF for static inclusion through
<c>--enable-static-nifs</c>, you must define <c>STATIC_ERLANG_NIF</c>
before the <c>ERL_NIF_INIT</c> declaration.</p>
@@ -522,7 +525,7 @@ return term;</code>
<p><c>load</c> is called when the NIF library is loaded
and no previously loaded library exists for this module.</p>
<p><c>*priv_data</c> can be set to point to some private data
- that the library needs to keep a state between NIF
+ if the library needs to keep a state between NIF
calls. <c>enif_priv_data</c> returns this pointer.
<c>*priv_data</c> is initialized to <c>NULL</c> when <c>load</c> is
called.</p>
@@ -539,7 +542,7 @@ return term;</code>
and there is old code of this module with a loaded NIF library.</p>
<p>Works as <c>load</c>, except that <c>*old_priv_data</c> already
contains the value set by the last call to <c>load</c> or
- <c>reload</c> for the old module code. <c>*priv_data</c> is
+ <c>upgrade</c> for the old module code. <c>*priv_data</c> is
initialized to <c>NULL</c> when <c>upgrade</c> is called. It is
allowed to write to both <c>*priv_data</c> and
<c>*old_priv_data.</c></p>
@@ -551,27 +554,7 @@ return term;</code>
<item>
<p><c>unload</c> is called when the module code that
the NIF library belongs to is purged as old. New code of the same
- module may or may not exist. Notice that <c>unload</c> is not
- called for a replaced library as a consequence of <c>reload</c>.</p>
- </item>
- <tag><marker id="reload"/><c>int (*reload)(ErlNifEnv* env, void**
- priv_data, ERL_NIF_TERM load_info)</c></tag>
- <item>
- <note>
- <p><em>The reload mechanism is deprecated.</em> It was only intended
- as a development feature. Do not use it as an upgrade method for
- live production systems. It can be removed in future releases.
- Ensure to pass <c>reload</c> as <c>NULL</c> to
- <seealso marker="#ERL_NIF_INIT"><c>ERL_NIF_INIT</c></seealso>
- to disable it when not used.</p>
- </note>
- <p><c>reload</c> is called when the NIF library is loaded and a
- previously loaded library already exists for this module code.</p>
- <p>Works as <c>load</c>, except that
- <c>*priv_data</c> already contains the value set by the
- previous call to <c>load</c> or <c>reload</c>.</p>
- <p>The library fails to load if <c>reload</c> returns
- anything other than <c>0</c> or if <c>reload</c> is <c>NULL</c>.</p>
+ module may or may not exist.</p>
</item>
</taglist>
</section>
@@ -659,9 +642,6 @@ typedef struct {
<p><c>flags</c> can be used to indicate that the NIF is a
<seealso marker="#dirty_nifs">dirty NIF</seealso> that is to be
executed on a dirty scheduler thread.</p>
- <p><em>The dirty NIF functionality described here is
- experimental.</em> You have to enable support for dirty
- schedulers when building OTP to try out the functionality.</p>
<p>If the dirty NIF is expected to be CPU-bound, its <c>flags</c>
field is to be set to <c>ERL_NIF_DIRTY_JOB_CPU_BOUND</c> or
<c>ERL_NIF_DIRTY_JOB_IO_BOUND</c>.</p>
@@ -2249,9 +2229,8 @@ enif_map_iterator_destroy(env, &amp;iter);</code>
returns <c>NULL</c> and sets <c>*tried</c> to <c>flags</c>.
It is allowed to set <c>tried</c> to <c>NULL</c>.</p>
<p>Notice that <c>enif_open_resource_type</c> is only allowed to be
- called in the three callbacks
- <seealso marker="#load"><c>load</c></seealso>,
- <seealso marker="#reload"><c>reload</c></seealso>, and
+ called in the two callbacks
+ <seealso marker="#load"><c>load</c></seealso> and
<seealso marker="#upgrade"><c>upgrade</c></seealso>.</p>
</desc>
</func>
@@ -2305,10 +2284,8 @@ enif_map_iterator_destroy(env, &amp;iter);</code>
<fsummary>Get the private data of a NIF library.</fsummary>
<desc>
<p>Returns the pointer to the private data that was set by
- <seealso marker="#load"><c>load</c></seealso>,
- <seealso marker="#reload"><c>reload</c></seealso>, or
+ <seealso marker="#load"><c>load</c></seealso> or
<seealso marker="#upgrade"><c>upgrade</c></seealso>.</p>
- <p>Was previously named <c>enif_get_data</c>.</p>
</desc>
</func>
@@ -2470,9 +2447,6 @@ enif_map_iterator_destroy(env, &amp;iter);</code>
application to break up long-running work into multiple regular NIF
calls or to schedule a <seealso marker="#dirty_nifs">
dirty NIF</seealso> to execute on a dirty scheduler thread.</p>
- <p><em>The dirty NIF functionality described here is
- experimental.</em> You have to enable support for dirty
- schedulers when building OTP to try out the functionality.</p>
<taglist>
<tag><c>fun_name</c></tag>
<item>
@@ -2483,13 +2457,13 @@ enif_map_iterator_destroy(env, &amp;iter);</code>
<tag><c>flags</c></tag>
<item>
<p>Must be set to <c>0</c> for a regular NIF. If the emulator was
- built with the experimental dirty scheduler support enabled,
+ built with dirty scheduler support enabled,
<c>flags</c> can be set to either
<c>ERL_NIF_DIRTY_JOB_CPU_BOUND</c> if the job is expected to be
CPU-bound, or <c>ERL_NIF_DIRTY_JOB_IO_BOUND</c> for
jobs that will be I/O-bound. If dirty scheduler threads are not
available in the emulator, an attempt to schedule such a job
- results in a <c>badarg</c> exception.</p>
+ results in a <c>notsup</c> exception.</p>
</item>
<tag><c>argc</c> and <c>argv</c></tag>
<item>
diff --git a/erts/doc/src/erl_tracer.xml b/erts/doc/src/erl_tracer.xml
index 83eef374ca..2681a19da0 100644
--- a/erts/doc/src/erl_tracer.xml
+++ b/erts/doc/src/erl_tracer.xml
@@ -103,7 +103,7 @@
<item>If set the tracer has been requested to include a
time stamp.</item>
<tag><c>extra</c></tag>
- <item>If set the tracepoint has included additonal data about
+ <item>If set the tracepoint has included additional data about
the trace event. What the additional data is depends on which
<c>TraceTag</c> has been triggered. The <c>extra</c> trace data
corresponds to the fifth element in the trace tuples described in
@@ -684,7 +684,7 @@ trace(_, _, _, _, _) ->
<p><c>erl_msg_tracer.c</c>:</p>
<pre>
-#include "erl_nif.h"
+#include &lt;erl_nif.h&gt;
/* NIF interface declarations */
static int load(ErlNifEnv* env, void** priv_data, ERL_NIF_TERM load_info);
diff --git a/erts/doc/src/erlang.xml b/erts/doc/src/erlang.xml
index 112682d713..352d30f3b4 100644
--- a/erts/doc/src/erlang.xml
+++ b/erts/doc/src/erlang.xml
@@ -325,16 +325,11 @@ Z = erlang:adler32_combine(X,Y,iolist_size(Data2)).</code>
is <c>latin1</c>, one byte exists for each character
in the text representation. If <c><anno>Encoding</anno></c> is
<c>utf8</c> or
- <c>unicode</c>, the characters are encoded using UTF-8
- (that is, characters from 128 through 255 are
- encoded in two bytes).</p>
+ <c>unicode</c>, the characters are encoded using UTF-8 where
+ characters may require multiple bytes.</p>
<note>
- <p><c>atom_to_binary(<anno>Atom</anno>, latin1)</c> never
- fails, as the text representation of an atom can only
- contain characters from 0 through 255. In a future release,
- the text representation
- of atoms can be allowed to contain any Unicode character and
- <c>atom_to_binary(<anno>Atom</anno>, latin1)</c> then fails if the
+ <p>As from Erlang/OTP 20, atoms can contain any Unicode character
+ and <c>atom_to_binary(<anno>Atom</anno>, latin1)</c> may fail if the
text representation for <c><anno>Atom</anno></c> contains a Unicode
character &gt; 255.</p>
</note>
@@ -402,13 +397,11 @@ Z = erlang:adler32_combine(X,Y,iolist_size(Data2)).</code>
translation of bytes in the binary is done.
If <c><anno>Encoding</anno></c>
is <c>utf8</c> or <c>unicode</c>, the binary must contain
- valid UTF-8 sequences. Only Unicode characters up
- to 255 are allowed.</p>
+ valid UTF-8 sequences.</p>
<note>
- <p><c>binary_to_atom(<anno>Binary</anno>, utf8)</c> fails if
- the binary contains Unicode characters &gt; 255.
- In a future release, such Unicode characters can be allowed and
- <c>binary_to_atom(<anno>Binary</anno>, utf8)</c> does then not fail.
+ <p>As from Erlang/OTP 20, <c>binary_to_atom(<anno>Binary</anno>, utf8)</c>
+ is capable of encoding any Unicode character. Earlier versions would
+ fail if the binary contained Unicode characters &gt; 255.
For more information about Unicode support in atoms, see the
<seealso marker="erl_ext_dist#utf8_atoms">note on UTF-8
encoded atoms</seealso>
@@ -419,9 +412,7 @@ Z = erlang:adler32_combine(X,Y,iolist_size(Data2)).</code>
> <input>binary_to_atom(&lt;&lt;"Erlang"&gt;&gt;, latin1).</input>
'Erlang'
> <input>binary_to_atom(&lt;&lt;1024/utf8&gt;&gt;, utf8).</input>
-** exception error: bad argument
- in function binary_to_atom/2
- called as binary_to_atom(&lt;&lt;208,128&gt;&gt;,utf8)</pre>
+'Ѐ'</pre>
</desc>
</func>
@@ -733,6 +724,19 @@ hello
</func>
<func>
+ <name name="ceil" arity="1"/>
+ <fsummary>Returns the smallest integer not less than the argument</fsummary>
+ <desc>
+ <p>Returns the smallest integer not less than
+ <c><anno>Number</anno></c>.
+ For example:</p>
+ <pre>
+> <input>ceil(5.5).</input>
+6</pre>
+ <p>Allowed in guard tests.</p>
+ </desc>
+ </func>
+ <func>
<name name="check_old_code" arity="1"/>
<fsummary>Check if a module has old code.</fsummary>
<desc>
@@ -1480,6 +1484,20 @@ true</pre>
</func>
<func>
+ <name name="floor" arity="1"/>
+ <fsummary>Returns the largest integer not greater than the argument</fsummary>
+ <desc>
+ <p>Returns the largest integer not greater than
+ <c><anno>Number</anno></c>.
+ For example:</p>
+ <pre>
+> <input>floor(-10.5).</input>
+-11</pre>
+ <p>Allowed in guard tests.</p>
+ </desc>
+ </func>
+
+ <func>
<name name="fun_info" arity="1"/>
<fsummary>Information about a fun.</fsummary>
<desc>
@@ -1667,6 +1685,12 @@ true</pre>
the form <c>{garbage_collect,
<anno>RequestId</anno>, <anno>GCResult</anno>}</c>.
</item>
+
+ <tag><c>{type, 'major' | 'minor'}</c></tag>
+ <item>Triggers garbage collection of requested type. Default value is
+ <c>'major'</c>, which would trigger a fullsweep GC.
+ The option <c>'minor'</c> is considered a hint and may lead to
+ either minor or major GC run.</item>
</taglist>
<p>If <c><anno>Pid</anno></c> equals <c>self()</c>, and
no <c>async</c> option has been passed, the garbage
@@ -1922,26 +1946,6 @@ os_prompt%</pre>
</func>
<func>
- <name name="hash" arity="2"/>
- <fsummary>Hash function (deprecated).</fsummary>
- <desc>
- <p>Returns a hash value for <c><anno>Term</anno></c> within the range
- <c>1..<anno>Range</anno></c>. The maximum range is 1..2^27-1.</p>
- <warning>
- <p><em>This BIF is deprecated, as the hash value can differ on
- different architectures.</em> The hash values for integer
- terms &gt; 2^27 and large binaries are
- poor. The BIF is retained for backward compatibility
- reasons (it can have been used to hash records into a file),
- but all new code is to use one of the BIFs
- <seealso marker="#phash/2"><c>erlang:phash/2</c></seealso> or
- <seealso marker="#phash2/1"><c>erlang:phash2/1,2</c></seealso>
- instead.</p>
- </warning>
- </desc>
- </func>
-
- <func>
<name name="hd" arity="1"/>
<fsummary>Head of a list.</fsummary>
<desc>
@@ -2368,10 +2372,10 @@ os_prompt%</pre>
<desc>
<p>Returns the atom whose text representation is
<c><anno>String</anno></c>.</p>
- <p><c><anno>String</anno></c> can only contain ISO-latin-1
- characters (that is, numbers &lt; 256) as the implementation does not
- allow Unicode characters equal to or above 256 in atoms.
- For more information on Unicode support in atoms, see
+ <p>As from Erlang/OTP 20, <c><anno>String</anno></c> may contain
+ any Unicode character. Earlier versions allowed only ISO-latin-1
+ characters as the implementation did not allow Unicode characters
+ above 255. For more information on Unicode support in atoms, see
<seealso marker="erl_ext_dist#utf8_atoms">note on UTF-8
encoded atoms</seealso>
in section "External Term Format" in the User's Guide.</p>
@@ -2544,13 +2548,6 @@ os_prompt%</pre>
<name name="load_nif" arity="2"/>
<fsummary>Load NIF library.</fsummary>
<desc>
- <note>
- <p>Before Erlang/OTP R14B, NIFs were an
- experimental feature. Versions before Erlang/OTP R14B can
- have different and possibly incompatible NIF semantics and
- interfaces. For example, in Erlang/OTP R13B03 the return value on
- failure was <c>{error,Reason,Text}</c>.</p>
- </note>
<p>Loads and links a dynamic library containing native
implemented functions (NIFs) for a module. <c><anno>Path</anno></c>
is a file path to the shareable object/dynamic library file minus
@@ -2580,14 +2577,22 @@ os_prompt%</pre>
<item>The library did not fulfill the requirements as a NIF
library of the calling module.
</item>
- <tag><c>load | reload | upgrade</c></tag>
+ <tag><c>load | upgrade</c></tag>
<item>The corresponding library callback was unsuccessful.
</item>
+ <tag><c>reload</c></tag>
+ <item>A NIF library is already loaded for this module instance.
+ The previously deprecated <c>reload</c> feature was removed in OTP 20.
+ </item>
<tag><c>old_code</c></tag>
<item>The call to <c>load_nif/2</c> was made from the old
code of a module that has been upgraded; this is not
allowed.
</item>
+ <tag><c>notsup</c></tag>
+ <item>Lack of support. Such as loading NIF library for a
+ HiPE compiled module.
+ </item>
</taglist>
</desc>
</func>
@@ -3784,9 +3789,6 @@ RealSystem = system + MissedSystem</code>
<c><anno>Term</anno></c> within the range
<c>1..<anno>Range</anno></c>. The maximum value for
<c><anno>Range</anno></c> is 2^32.</p>
- <p>This BIF can be used instead of the old deprecated BIF
- <c>erlang:hash/2</c>, as it calculates better hashes for
- all data types, but consider using <c>phash2/1,2</c> instead.</p>
</desc>
</func>
@@ -3821,10 +3823,6 @@ RealSystem = system + MissedSystem</code>
<desc>
<p>Returns a string corresponding to the text
representation of <c><anno>Pid</anno></c>.</p>
- <warning>
- <p>This BIF is intended for debugging and is not to be used
- in application programs.</p>
- </warning>
</desc>
</func>
@@ -4397,10 +4395,6 @@ RealSystem = system + MissedSystem</code>
<desc>
<p>Returns a string corresponding to the text
representation of the port identifier <c><anno>Port</anno></c>.</p>
- <warning>
- <p>This BIF is intended for debugging. It is not to be used
- in application programs.</p>
- </warning>
</desc>
</func>
@@ -4597,7 +4591,7 @@ RealSystem = system + MissedSystem</code>
<p>If the process potentially can get many messages,
you are advised to set the flag to <c>off_heap</c>. This
because a garbage collection with many messages placed on
- the heap can become extremly expensive and the process can
+ the heap can become extremely expensive and the process can
consume large amounts of memory. Performance of the
actual message passing is however generally better when not
using flag <c>off_heap</c>.</p>
@@ -6381,12 +6375,17 @@ lists:map(
<c><anno>TotalTime</anno></c> is the total time duration since
<seealso marker="#system_flag_scheduler_wall_time">
<c>scheduler_wall_time</c></seealso>
- activation. The time unit is undefined and can be subject
- to change between releases, OSs, and system restarts.
- <c>scheduler_wall_time</c> is only to be used to
- calculate relative values for scheduler-utilization.
- <c><anno>ActiveTime</anno></c> can never exceed
- <c><anno>TotalTime</anno></c>.</p>
+ activation for the specific scheduler. Note that
+ activation time can differ significantly between
+ schedulers. Currently dirty schedulers are activated
+ at system start while normal schedulers are activated
+ some time after the <c>scheduler_wall_time</c>
+ functionality is enabled. The time unit is undefined
+ and can be subject to change between releases, OSs,
+ and system restarts. <c>scheduler_wall_time</c> is only
+ to be used to calculate relative values for scheduler
+ utilization. <c><anno>ActiveTime</anno></c> can never
+ exceed <c><anno>TotalTime</anno></c>.</p>
<p>The definition of a busy scheduler is when it is not idle
and is not scheduling (selecting) a process or port,
that is:</p>
@@ -6404,15 +6403,37 @@ lists:map(
<c>scheduler_wall_time</c></seealso> is turned off.</p>
<p>The list of scheduler information is unsorted and can
appear in different order between calls.</p>
+ <p>As of ERTS version 9.0, also dirty CPU schedulers will
+ be included in the result. That is, all scheduler threads
+ that are expected to handle CPU bound work. If you also
+ want information about dirty I/O schedulers, use
+ <seealso marker="#statistics_scheduler_wall_time_all"><c>statistics(scheduler_wall_time_all)</c></seealso>
+ instead.</p>
+
+ <p>Normal schedulers will have scheduler identifiers in
+ the range <c>1 =&lt; <anno>SchedulerId</anno> =&lt;
+ </c><seealso marker="#system_info_schedulers"><c>erlang:system_info(schedulers)</c></seealso>.
+ Dirty CPU schedulers will have scheduler identifiers in
+ the range <c>erlang:system_info(schedulers) &lt;
+ <anno>SchedulerId</anno> =&lt; erlang:system_info(schedulers)
+ +
+ </c><seealso marker="#system_info_dirty_cpu_schedulers"><c>erlang:system_info(dirty_cpu_schedulers)</c></seealso>.
+ </p>
+ <note><p>The different types of schedulers handle
+ specific types of jobs. Every job is assigned to a specific
+ scheduler type. Jobs can migrate between different schedulers
+ of the same type, but never between schedulers of different
+ types. This fact has to be taken under consideration when
+ evaluating the result returned.</p></note>
<p>Using <c>scheduler_wall_time</c> to calculate
- scheduler-utilization:</p>
+ scheduler utilization:</p>
<pre>
> <input>erlang:system_flag(scheduler_wall_time, true).</input>
false
> <input>Ts0 = lists:sort(erlang:statistics(scheduler_wall_time)), ok.</input>
ok</pre>
<p>Some time later the user takes another snapshot and calculates
- scheduler-utilization per scheduler, for example:</p>
+ scheduler utilization per scheduler, for example:</p>
<pre>
> <input>Ts1 = lists:sort(erlang:statistics(scheduler_wall_time)), ok.</input>
ok
@@ -6427,11 +6448,32 @@ ok
{7,0.973237033077876},
{8,0.9741297293248656}]</pre>
<p>Using the same snapshots to calculate a total
- scheduler-utilization:</p>
+ scheduler utilization:</p>
<pre>
> <input>{A, T} = lists:foldl(fun({{_, A0, T0}, {_, A1, T1}}, {Ai,Ti}) ->
- {Ai + (A1 - A0), Ti + (T1 - T0)} end, {0, 0}, lists:zip(Ts0,Ts1)), A/T.</input>
+ {Ai + (A1 - A0), Ti + (T1 - T0)} end, {0, 0}, lists:zip(Ts0,Ts1)),
+ TotalSchedulerUtilization = A/T.</input>
+0.9769136803764825</pre>
+ <p>Total scheduler utilization will equal <c>1.0</c> when
+ all schedulers have been active all the time between the
+ two measurements.</p>
+ <p>Another (probably more) useful value is to calculate
+ total scheduler utilization weighted against maximum amount
+ of available CPU time:</p>
+ <pre>
+> <input>WeightedSchedulerUtilization = (TotalSchedulerUtilization
+ * (erlang:system_info(schedulers)
+ + erlang:system_info(dirty_cpu_schedulers)))
+ / erlang:system_info(logical_processors_available).</input>
0.9769136803764825</pre>
+ <p>This weighted scheduler utilization will reach <c>1.0</c>
+ when schedulers are active the same amount of time as
+ maximum available CPU time. If more schedulers exist
+ than available logical processors, this value may
+ be greater than <c>1.0</c>.</p>
+ <p>As of ERTS version 9.0, the Erlang runtime system
+ with SMP support will as default have more schedulers
+ than logical processors. This due to the dirty schedulers.</p>
<note>
<p><c>scheduler_wall_time</c> is by default disabled. To
enable it, use
@@ -6442,6 +6484,31 @@ ok
<func>
<name name="statistics" arity="1" clause_i="12"/>
+ <fsummary>Information about each schedulers work time.</fsummary>
+ <desc>
+ <marker id="statistics_scheduler_wall_time_all"></marker>
+ <p>The same as
+ <seealso marker="#statistics_scheduler_wall_time"><c>statistics(scheduler_wall_time)</c></seealso>,
+ except that it also include information about all dirty I/O
+ schedulers.</p>
+ <p>Dirty IO schedulers will have scheduler identifiers in
+ the range
+ <seealso marker="#system_info_schedulers"><c>erlang:system_info(schedulers)</c></seealso><c>
+ +
+ </c><seealso marker="#system_info_dirty_cpu_schedulers"><c>erlang:system_info(dirty_cpu_schedulers)</c></seealso><c> &lt;
+ <anno>SchedulerId</anno> =&lt; erlang:system_info(schedulers)
+ + erlang:system_info(dirty_cpu_schedulers)
+ +
+ </c><seealso marker="#system_info_dirty_io_schedulers"><c>erlang:system_info(dirty_io_schedulers)</c></seealso>.</p>
+ <note><p>Note that work executing on dirty I/O schedulers
+ are expected to mainly wait for I/O. That is, when you
+ get high scheduler utilization on dirty I/O schedulers,
+ CPU utilization is <em>not</em> expected to be high due to
+ this work.</p></note>
+ </desc>
+ </func>
+ <func>
+ <name name="statistics" arity="1" clause_i="13"/>
<fsummary>Information about active processes and ports.</fsummary>
<desc><marker id="statistics_total_active_tasks"></marker>
<p>Returns the total amount of active processes and ports in
@@ -6461,7 +6528,7 @@ ok
</func>
<func>
- <name name="statistics" arity="1" clause_i="13"/>
+ <name name="statistics" arity="1" clause_i="14"/>
<fsummary>Information about the run-queue lengths.</fsummary>
<desc><marker id="statistics_total_run_queue_lengths"></marker>
<p>Returns the total length of the run queues. That is, the number
@@ -6481,7 +6548,7 @@ ok
</func>
<func>
- <name name="statistics" arity="1" clause_i="14"/>
+ <name name="statistics" arity="1" clause_i="15"/>
<fsummary>Information about wall clock.</fsummary>
<desc>
<p>Returns information about wall clock. <c>wall_clock</c> can
@@ -6687,11 +6754,6 @@ ok
down to 3. Similarly, the number of dirty CPU schedulers
online increases proportionally to increases in the number of
schedulers online.</p>
- <note>
- <p>The dirty schedulers functionality is experimental.
- Enable support for dirty schedulers when building OTP to
- try out the functionality.</p>
- </note>
<p>For more information, see
<seealso marker="#system_info_dirty_cpu_schedulers">
<c>erlang:system_info(dirty_cpu_schedulers)</c></seealso> and
@@ -7194,8 +7256,8 @@ ok
</func>
<func>
- <name name="system_info" arity="1" clause_i="10"/>
- <name name="system_info" arity="1" clause_i="11"/>
+ <name name="system_info" arity="1" clause_i="12"/>
+ <name name="system_info" arity="1" clause_i="13"/>
<fsummary>Information about the CPU topology of the system.</fsummary>
<type name="cpu_topology"/>
<type name="level_entry"/>
@@ -7295,12 +7357,12 @@ ok
</func>
<func>
- <name name="system_info" arity="1" clause_i="27"/>
- <name name="system_info" arity="1" clause_i="28"/>
- <name name="system_info" arity="1" clause_i="36"/>
- <name name="system_info" arity="1" clause_i="37"/>
+ <name name="system_info" arity="1" clause_i="29"/>
+ <name name="system_info" arity="1" clause_i="30"/>
<name name="system_info" arity="1" clause_i="38"/>
<name name="system_info" arity="1" clause_i="39"/>
+ <name name="system_info" arity="1" clause_i="40"/>
+ <name name="system_info" arity="1" clause_i="41"/>
<fsummary>Information about the default process heap settings.</fsummary>
<type name="message_queue_data"/>
<type name="max_heap_size"/>
@@ -7343,12 +7405,6 @@ ok
see <seealso marker="#process_flag_max_heap_size">
<c>process_flag(max_heap_size, MaxHeapSize)</c></seealso>.</p>
</item>
- <tag><c>min_heap_size</c></tag>
- <item>
- <p>Returns <c>{min_heap_size, <anno>MinHeapSize</anno>}</c>,
- where <c><anno>MinHeapSize</anno></c> is the current
- system-wide minimum heap size for spawned processes.</p>
- </item>
<tag><marker id="system_info_message_queue_data"/>
<c>message_queue_data</c></tag>
<item>
@@ -7361,6 +7417,12 @@ ok
<seealso marker="#process_flag_message_queue_data">
<c>process_flag(message_queue_data, MQD)</c></seealso>.</p>
</item>
+ <tag><c>min_heap_size</c></tag>
+ <item>
+ <p>Returns <c>{min_heap_size, <anno>MinHeapSize</anno>}</c>,
+ where <c><anno>MinHeapSize</anno></c> is the current
+ system-wide minimum heap size for spawned processes.</p>
+ </item>
<tag><c>min_bin_vheap_size</c></tag>
<item>
<p>Returns <c>{min_bin_vheap_size,
@@ -7377,8 +7439,8 @@ ok
<name name="system_info" arity="1" clause_i="7"/>
<name name="system_info" arity="1" clause_i="8"/>
<name name="system_info" arity="1" clause_i="9"/>
- <name name="system_info" arity="1" clause_i="12"/>
- <name name="system_info" arity="1" clause_i="13"/>
+ <name name="system_info" arity="1" clause_i="10"/>
+ <name name="system_info" arity="1" clause_i="11"/>
<name name="system_info" arity="1" clause_i="14"/>
<name name="system_info" arity="1" clause_i="15"/>
<name name="system_info" arity="1" clause_i="16"/>
@@ -7392,15 +7454,15 @@ ok
<name name="system_info" arity="1" clause_i="24"/>
<name name="system_info" arity="1" clause_i="25"/>
<name name="system_info" arity="1" clause_i="26"/>
- <name name="system_info" arity="1" clause_i="29"/>
- <name name="system_info" arity="1" clause_i="30"/>
+ <name name="system_info" arity="1" clause_i="27"/>
+ <name name="system_info" arity="1" clause_i="28"/>
<name name="system_info" arity="1" clause_i="31"/>
<name name="system_info" arity="1" clause_i="32"/>
<name name="system_info" arity="1" clause_i="33"/>
<name name="system_info" arity="1" clause_i="34"/>
<name name="system_info" arity="1" clause_i="35"/>
- <name name="system_info" arity="1" clause_i="40"/>
- <name name="system_info" arity="1" clause_i="41"/>
+ <name name="system_info" arity="1" clause_i="36"/>
+ <name name="system_info" arity="1" clause_i="37"/>
<name name="system_info" arity="1" clause_i="42"/>
<name name="system_info" arity="1" clause_i="43"/>
<name name="system_info" arity="1" clause_i="44"/>
@@ -7429,16 +7491,28 @@ ok
<name name="system_info" arity="1" clause_i="67"/>
<name name="system_info" arity="1" clause_i="68"/>
<name name="system_info" arity="1" clause_i="69"/>
+ <name name="system_info" arity="1" clause_i="70"/>
+ <name name="system_info" arity="1" clause_i="71"/>
<fsummary>Information about the system.</fsummary>
<desc>
<p>Returns various information about the current system
(emulator) as specified by <c><anno>Item</anno></c>:</p>
<taglist>
- <tag><c>allocated_areas</c>, <c>allocator</c>,
- <c>alloc_util_allocators</c>, <c>allocator_sizes</c></tag>
+ <tag><c>atom_count</c></tag>
+ <item>
+ <marker id="system_info_atom_count"></marker>
+ <p>Returns the number of atoms currently existing at the
+ local node. The value is given as an integer.</p>
+ </item>
+ <tag><c>atom_limit</c></tag>
<item>
- <p>See <seealso marker="#system_info_allocator_tags">
- above</seealso>.</p>
+ <marker id="system_info_atom_limit"></marker>
+ <p>Returns the maximum number of atoms allowed.
+ This limit can be increased at startup by passing
+ command-line flag
+ <seealso marker="erts:erl#+t"><c>+t</c></seealso> to
+ <c>erl(1)</c>.
+ </p>
</item>
<tag><c>build_type</c></tag>
<item>
@@ -7524,9 +7598,6 @@ ok
<seealso marker="erts:erl#+SDcpu"><c>+SDcpu</c></seealso> or
<seealso marker="erts:erl#+SDPcpu"><c>+SDPcpu</c></seealso> in
<c>erl(1)</c>.</p>
- <p>Notice that the dirty schedulers functionality is
- experimental. Enable support for dirty schedulers when
- building OTP to try out the functionality.</p>
<p>See also
<seealso marker="#system_flag_dirty_cpu_schedulers_online">
<c>erlang:system_flag(dirty_cpu_schedulers_online,
@@ -7556,9 +7627,6 @@ ok
startup by passing command-line flag
<seealso marker="erts:erl#+SDcpu"><c>+SDcpu</c></seealso> in
<c>erl(1)</c>.</p>
- <p>Notice that the dirty schedulers functionality is
- experimental. Enable support for dirty schedulers when
- building OTP to try out the functionality.</p>
<p>For more information, see
<seealso marker="#system_info_dirty_cpu_schedulers">
<c>erlang:system_info(dirty_cpu_schedulers)</c></seealso>,
@@ -7580,9 +7648,6 @@ ok
<p>This value can be set at startup by passing command-line
argument <seealso marker="erts:erl#+SDio"><c>+SDio</c></seealso>
in <c>erl(1)</c>.</p>
- <p>Notice that the dirty schedulers functionality is
- experimental. Enable support for dirty schedulers when
- building OTP to try out the functionality.</p>
<p>For more information, see
<seealso marker="#system_info_dirty_cpu_schedulers">
<c>erlang:system_info(dirty_cpu_schedulers)</c></seealso>,
diff --git a/erts/doc/src/erts_alloc.xml b/erts/doc/src/erts_alloc.xml
index 8ab35851c1..49dadfb42c 100644
--- a/erts/doc/src/erts_alloc.xml
+++ b/erts/doc/src/erts_alloc.xml
@@ -452,7 +452,7 @@
utilization value &gt; 0 is used, allocator instances
are allowed to abandon multiblock carriers. If <c>de</c> (default
enabled) is passed instead of a <c><![CDATA[<utilization>]]></c>,
- a recomended non-zero utilization value is used. The value
+ a recommended non-zero utilization value is used. The value
chosen depends on the allocator type and can be changed between
ERTS versions. Defaults to <c>de</c>, but this
can be changed in the future.</p>
diff --git a/erts/doc/src/notes.xml b/erts/doc/src/notes.xml
index ae1d2b1d93..05142c9338 100644
--- a/erts/doc/src/notes.xml
+++ b/erts/doc/src/notes.xml
@@ -564,7 +564,7 @@
<list>
<item>
<p>
- Fixed a VM crash that occured in a garbage collection of
+ Fixed a VM crash that occurred in a garbage collection of
a process when it had received binaries. This bug was
introduced in ERTS version 8.0 (OTP 19.0).</p>
<p>
@@ -581,7 +581,7 @@
<list>
<item>
<p>
- Fixed a VM crash that occured in garbage collection of a
+ Fixed a VM crash that occurred in garbage collection of a
process when it had received maps over the distribution.
This bug was introduced in ERTS version 8.0 (OTP 19.0).</p>
<p>
@@ -5682,7 +5682,7 @@
dependent, so applications aiming to be portable should
consider using <c>{ipv6_v6only,true}</c> when creating an
<c>inet6</c> listening/destination socket, and if
- neccesary also create an <c>inet</c> socket on the same
+ necessary also create an <c>inet</c> socket on the same
port for IPv4 traffic. See the documentation.</p>
<p>
Own Id: OTP-8928 Aux Id: kunagi-193 [104] </p>
@@ -6063,7 +6063,7 @@
This change of default value will reduce lock contention
on ETS tables using the <c>read_concurrency</c> option at
the expense of memory consumption when the amount of
- schedulers and logical processors are beween 8 and 64.
+ schedulers and logical processors are between 8 and 64.
For more information, see documentation of the <c>+rg</c>
command line argument of <c>erl(1)</c>.</p>
<p>
@@ -7040,7 +7040,7 @@
<p>
For the subsection about process_flag(save_calls, N)
there's an unrelated paragraph about process priorities
- which was copied from the preceeding subsection regarding
+ which was copied from the preceding subsection regarding
process_flag(priority, Level). (Thanks to Filipe David
Manana)</p>
<p>
@@ -8255,7 +8255,7 @@
<item>
<p>
Wx on MacOS X generated complains on stderr about certain
- cocoa functions not beeing called from the "Main thread".
+ cocoa functions not being called from the "Main thread".
This is now corrected.</p>
<p>
Own Id: OTP-9081</p>
@@ -9246,7 +9246,7 @@
</item>
<item>
<p>The <c>empd</c> program could loop and consume 100%
- CPU time if an unexpected error ocurred in
+ CPU time if an unexpected error occurred in
<c>listen()</c> or <c>accept()</c>. Now <c>epmd</c> will
terminate if a non-recoverable error occurs. (Thanks to
Michael Santos.)</p>
diff --git a/erts/doc/src/zlib.xml b/erts/doc/src/zlib.xml
index 138414a880..e1924fffee 100644
--- a/erts/doc/src/zlib.xml
+++ b/erts/doc/src/zlib.xml
@@ -576,6 +576,18 @@ unpack(Z, Compressed, Dict) ->
</func>
<func>
+ <name name="inflateGetDictionary" arity="1"/>
+ <fsummary>Return the decompression dictionary.</fsummary>
+ <desc>
+ <p>Returns the decompression dictionary currently in use
+ by the stream. This function must be called between
+ <seealso marker="#inflateInit/1"><c>inflateInit/1,2</c></seealso>
+ and <seealso marker="#inflateEnd/1"><c>inflateEnd</c></seealso>.</p>
+ <p>Only supported if ERTS was compiled with zlib >= 1.2.8.</p>
+ </desc>
+ </func>
+
+ <func>
<name name="open" arity="0"/>
<fsummary>Open a stream and return a stream reference.</fsummary>
<desc>