diff options
Diffstat (limited to 'erts/doc')
| -rw-r--r-- | erts/doc/src/erl_ext_dist.xml | 251 |
1 files changed, 181 insertions, 70 deletions
diff --git a/erts/doc/src/erl_ext_dist.xml b/erts/doc/src/erl_ext_dist.xml index b7090d0472..5813af1d57 100644 --- a/erts/doc/src/erl_ext_dist.xml +++ b/erts/doc/src/erl_ext_dist.xml @@ -386,44 +386,6 @@ </section> <section> - <marker id="REFERENCE_EXT"/> - <title>REFERENCE_EXT</title> - <table align="left"> - <row> - <cell align="center">1</cell> - <cell align="center">N</cell> - <cell align="center">4</cell> - <cell align="center">1</cell> - </row> - <row> - <cell align="center"><c>101</c></cell> - <cell align="center"><c>Node</c></cell> - <cell align="center"><c>ID</c></cell> - <cell align="center"><c>Creation</c></cell> - </row> - <tcaption>REFERENCE_EXT</tcaption></table> - <p> - Encodes a reference object (an object generated with - <seealso marker="erlang:make_ref/0">erlang:make_ref/0</seealso>). - The <c>Node</c> term is an encoded atom, that is, - <seealso marker="#ATOM_UTF8_EXT"><c>ATOM_UTF8_EXT</c></seealso>, - <seealso marker="#SMALL_ATOM_UTF8_EXT"><c>SMALL_ATOM_UTF8_EXT</c></seealso>, or - <seealso marker="#ATOM_CACHE_REF"><c>ATOM_CACHE_REF</c></seealso>. - The <c>ID</c> field contains a big-endian unsigned integer, - but <em>is to be regarded as uninterpreted data</em>, - as this field is node-specific. - <c>Creation</c> is a byte containing a node serial number, which - makes it possible to separate old (crashed) nodes from a new one. - </p> - <p> - In <c>ID</c>, only 18 bits are significant; the rest are to be 0. - In <c>Creation</c>, only two bits are significant; the rest are to be 0. - See <seealso marker="#NEW_REFERENCE_EXT"> - <c>NEW_REFERENCE_EXT</c></seealso>. - </p> - </section> - - <section> <marker id="PORT_EXT"/> <title>PORT_EXT</title> <table align="left"> @@ -441,13 +403,46 @@ </row> <tcaption>PORT_EXT</tcaption></table> <p> - Encodes a port object (obtained from - <seealso marker="erlang:open_port/2"> - <c>erlang:open_port/2</c></seealso>). - The <c>ID</c> is a node-specific identifier for a local port. + Same as <seealso marker="#NEW_PORT_EXT"><c>NEW_PORT_EXT</c></seealso> + except the <c>Creation</c> field is only one byte and only two + bits are significant, the rest are to be 0. + </p> + </section> + + <section> + <marker id="NEW_PORT_EXT"/> + <title>NEW_PORT_EXT</title> + <table align="left"> + <row> + <cell align="center">1</cell> + <cell align="center">N</cell> + <cell align="center">4</cell> + <cell align="center">4</cell> + </row> + <row> + <cell align="center"><c>89</c></cell> + <cell align="center"><c>Node</c></cell> + <cell align="center"><c>ID</c></cell> + <cell align="center"><c>Creation</c></cell> + </row> + <tcaption>NEW_PORT_EXT</tcaption></table> + <p> + Encodes a port identifier (obtained from + <seealso marker="erlang#open_port/2"><c>erlang:open_port/2</c></seealso>). + <c>Node</c> is an encoded atom, that is, + <seealso marker="#ATOM_UTF8_EXT"><c>ATOM_UTF8_EXT</c></seealso>, + <seealso marker="#SMALL_ATOM_UTF8_EXT"><c>SMALL_ATOM_UTF8_EXT</c></seealso> + or <seealso marker="#ATOM_CACHE_REF"><c>ATOM_CACHE_REF</c></seealso>. + <c>ID</c> is a 32-bit big endian unsigned integer. Only 28 bits are + significant; the rest are to be 0. The <c>Creation</c> works just like in + <seealso marker="#NEW_PID_EXT"><c>NEW_PID_EXT</c></seealso>. Port operations are not allowed across node boundaries. - The <c>Creation</c> works just like in - <seealso marker="#REFERENCE_EXT"><c>REFERENCE_EXT</c></seealso>. + </p> + <p>Introduced in OTP 19, but only to be decoded and echoed back. Not + encoded for local ports. Planned to supersede <seealso marker="#PORT_EXT"> + <c>PORT_EXT</c></seealso> in OTP 23 when + <seealso marker="erl_dist_protocol#dflags"><c>DFLAG_BIG_CREATON</c></seealso> + becomes mandatory. </p> </section> @@ -471,12 +466,65 @@ </row> <tcaption>PID_EXT</tcaption></table> <p> - Encodes a process identifier object (obtained from - <seealso marker="erlang:spawn/3"><c>erlang:spawn/3</c></seealso> or - friends). The <c>ID</c> and <c>Creation</c> fields works just like in - <seealso marker="#REFERENCE_EXT"><c>REFERENCE_EXT</c></seealso>, while - the <c>Serial</c> field is used to improve safety. - In <c>ID</c>, only 15 bits are significant; the rest are to be 0. + Same as <seealso marker="#NEW_PID_EXT"><c>NEW_PID_EXT</c></seealso> + except the <c>Creation</c> field is only one byte and only two + bits are significant, the rest are to be 0. + </p> + </section> + + <section> + <marker id="NEW_PID_EXT"/> + <title>NEW_PID_EXT</title> + <table align="left"> + <row> + <cell align="center">1</cell> + <cell align="center">N</cell> + <cell align="center">4</cell> + <cell align="center">4</cell> + <cell align="center">4</cell> + </row> + <row> + <cell align="center"><c>88</c></cell> + <cell align="center"><c>Node</c></cell> + <cell align="center"><c>ID</c></cell> + <cell align="center"><c>Serial</c></cell> + <cell align="center"><c>Creation</c></cell> + </row> + <tcaption>NEW_PID_EXT</tcaption></table> + <p> + Encodes an Erlang process identifier object. + </p> + <taglist> + <tag><c>Node</c></tag> + <item><p>The name of the originating node, encoded using + <seealso marker="#ATOM_UTF8_EXT"><c>ATOM_UTF8_EXT</c></seealso>, + <seealso marker="#SMALL_ATOM_UTF8_EXT"><c>SMALL_ATOM_UTF8_EXT</c></seealso> + or <seealso + marker="#ATOM_CACHE_REF"><c>ATOM_CACHE_REF</c></seealso>.</p> + </item> + <tag><c>ID</c></tag> + <item><p>A 32-bit big endian unsigned integer. Only 15 bits are + significant; the rest are to be 0.</p> + </item> + <tag><c>Serial</c></tag> + <item><p>A 32-bit big endian unsigned integer. Only 13 bits are + significant; the rest are to be 0.</p> + </item> + <tag><c>Creation</c></tag> + <item><p>A 32-bit big endian unsigned integer. All identifiers + originating from the same node incarnation must have identical <c>Creation</c> + values. This makes it possible to separate identifiers from old + (crashed) nodes from a new one. The value zero should be avoided for + normal operations as it is used as a wild card for debug purpose + (like a pid returned by <seealso marker="erts:erlang#list_to_pid/1"> + erlang:list_to_pid/1</seealso>).</p> + </item> + </taglist> + <p>Introduced in OTP 19, but only to be decoded and echoed back. Not + encoded for local processes. Planned to supersede <seealso marker="#PID_EXT"> + <c>PID_EXT</c></seealso> in OTP 23 when + <seealso marker="erl_dist_protocol#dflags"><c>DFLAG_BIG_CREATON</c></seealso> + becomes mandatory. </p> </section> @@ -700,6 +748,30 @@ </section> <section> + <marker id="REFERENCE_EXT"/> + <title>REFERENCE_EXT (deprecated)</title> + <table align="left"> + <row> + <cell align="center">1</cell> + <cell align="center">N</cell> + <cell align="center">4</cell> + <cell align="center">1</cell> + </row> + <row> + <cell align="center"><c>101</c></cell> + <cell align="center"><c>Node</c></cell> + <cell align="center"><c>ID</c></cell> + <cell align="center"><c>Creation</c></cell> + </row> + <tcaption>REFERENCE_EXT</tcaption></table> + <p> + The same as <seealso marker="#NEW_REFERENCE_EXT"> + <c>NEW_REFERENCE_EXT</c></seealso> except <c>ID</c> is only one word + (<c>Len</c> = 1). + </p> + </section> + + <section> <marker id="NEW_REFERENCE_EXT"/> <title>NEW_REFERENCE_EXT</title> <table align="left"> @@ -719,29 +791,68 @@ </row> <tcaption>NEW_REFERENCE_EXT</tcaption></table> <p> - <c>Node</c> and <c>Creation</c> are as in - <seealso marker="#REFERENCE_EXT"><c>REFERENCE_EXT</c></seealso>. - </p> - <p> - <c>ID</c> contains a sequence of big-endian unsigned integers - (4 bytes each, so <c>N'</c> is a multiple of 4), - but is to be regarded as uninterpreted data. - </p> - <p> - <c>N'</c> = 4 * <c>Len</c>. - </p> - <p> - In the first word (4 bytes) of <c>ID</c>, only 18 bits are - significant, the rest are to be 0. - In <c>Creation</c>, only two bits are significant, - the rest are to be 0. + The same as <seealso marker="#NEWER_REFERENCE_EXT"> + <c>NEWER_REFERENCE_EXT</c></seealso> <em>except</em>: </p> + <taglist> + <tag><c>ID</c></tag> + <item><p>In the first word (4 bytes) of <c>ID</c>, only 18 bits are + significant, the rest must be 0.</p> + </item> + <tag><c>Creation</c></tag> + <item><p>Only one byte long and only two bits are significant, the rest must be 0.</p> + </item> + </taglist> + </section> + + <section> + <marker id="NEWER_REFERENCE_EXT"/> + <title>NEWER_REFERENCE_EXT</title> + <table align="left"> + <row> + <cell align="center">1</cell> + <cell align="center">2</cell> + <cell align="center">N</cell> + <cell align="center">4</cell> + <cell align="center">N'</cell> + </row> + <row> + <cell align="center"><c>90</c></cell> + <cell align="center"><c>Len</c></cell> + <cell align="center"><c>Node</c></cell> + <cell align="center"><c>Creation</c></cell> + <cell align="center"><c>ID ...</c></cell> + </row> + <tcaption>NEWER_REFERENCE_EXT</tcaption></table> <p> - <c>NEW_REFERENCE_EXT</c> was introduced with distribution version 4. - In version 4, <c>N'</c> is to be at most 12. + Encodes a reference term generated with + <seealso marker="erts:erlang#make_ref/0">erlang:make_ref/0</seealso>. </p> - <p> - See <seealso marker="#REFERENCE_EXT"><c>REFERENCE_EXT</c></seealso>. + <taglist> + <tag><c>Node</c></tag> + <item><p>The name of the originating node, encoded using + <seealso marker="#ATOM_UTF8_EXT"><c>ATOM_UTF8_EXT</c></seealso>, + <seealso marker="#SMALL_ATOM_UTF8_EXT"><c>SMALL_ATOM_UTF8_EXT</c></seealso> + or <seealso marker="#ATOM_CACHE_REF"><c>ATOM_CACHE_REF</c></seealso>.</p> + </item> + <tag><c>Len</c></tag> + <item><p>A 16-bit big endian unsigned integer not larger than 3.</p> + </item> + <tag><c>ID</c></tag> + <item><p>A sequence of <c>Len</c> big-endian unsigned integers + (4 bytes each, so <c>N'</c> = 4 * <c>Len</c>), + but is to be regarded as uninterpreted data.</p> + </item> + <tag><c>Creation</c></tag> + <item><p>Works just like in + <seealso marker="#NEW_PID_EXT"><c>NEW_PID_EXT</c></seealso>.</p> + </item> + </taglist> + <p>Introduced in OTP 19, but only to be decoded and echoed back. Not + encoded for local references. Planned to supersede <seealso marker="#NEW_REFERENCE_EXT"> + <c>NEW_REFERENCE_EXT</c></seealso> in OTP 23 when + <seealso marker="erl_dist_protocol#dflags"><c>DFLAG_BIG_CREATON</c></seealso> + becomes mandatory. </p> </section> |