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authorRickard Green <[email protected]>2019-05-08 09:50:00 +0200
committerRickard Green <[email protected]>2019-05-08 09:50:00 +0200
commit8780156706350a56b763d70f8672d0343f9f9e54 (patch)
treeac24bdec9436e669c47ed13ce098b25ba97d3be3 /erts/doc/src
parentd15ec5c180e1eb2e7c4c87f21399c51b4354a639 (diff)
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Fix bad merge from maint-21
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diff --git a/erts/doc/src/notes.xml b/erts/doc/src/notes.xml
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@@ -31,6 +31,24 @@
</header>
<p>This document describes the changes made to the ERTS application.</p>
+<section><title>Erts 10.3.5</title>
+
+ <section><title>Fixed Bugs and Malfunctions</title>
+ <list>
+ <item>
+ <p>
+ Fixed more bugs in <c>process_info(reductions)</c>
+ causing it to sometimes behave non-monotonic. That is, a
+ subsequent call toward the same process could return a
+ lower reduction value.</p>
+ <p>
+ Own Id: OTP-15793 Aux Id: ERIERL-337, OTP-15709 </p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
<section><title>Erts 10.3.4</title>
<section><title>Fixed Bugs and Malfunctions</title>
@@ -2078,2015 +2096,6 @@
</section>
-<section><title>Erts 10.3.5</title>
-
- <section><title>Fixed Bugs and Malfunctions</title>
- <list>
- <item>
- <p>
- Fixed more bugs in <c>process_info(reductions)</c>
- causing it to sometimes behave non-monotonic. That is, a
- subsequent call toward the same process could return a
- lower reduction value.</p>
- <p>
- Own Id: OTP-15793 Aux Id: ERIERL-337, OTP-15709 </p>
- </item>
- </list>
- </section>
-
-</section>
-
-<section><title>Erts 10.3.4</title>
-
- <section><title>Fixed Bugs and Malfunctions</title>
- <list>
- <item>
- <p>Add missing documentation of new external tags
- <c>NEW_PID</c>, <c>NEW_PORT</c> and
- <c>NEWER_REFERENCE</c> introduced in OTP 19.</p> <p>These
- new tags are planned to be "activated" in OTP 23 when
- distribution capability flag <c>DFLAG_BIG_CREATION</c>
- becomes mandatory. Older nodes (>= 19) are able to decode
- these new tags and send them back to the new node. Nodes
- older than OTP 23 will however never encode their own
- local pids, ports and references using the new tags.</p>
- <p>
- Own Id: OTP-15766</p>
- </item>
- </list>
- </section>
-
-</section>
-
-<section><title>Erts 10.3.3</title>
-
- <section><title>Fixed Bugs and Malfunctions</title>
- <list>
- <item>
- <p>
- Fix <c>erlang:open_port/2</c> with the <c>fd</c> option
- to correctly cleanup the pollset when the port is closed.
- Before this fix there would be error printouts sent to
- logger when the same fd was reused in a new port.</p>
- <p>
- Own Id: OTP-15753 Aux Id: ERL-900 </p>
- </item>
- </list>
- </section>
-
-</section>
-
-<section><title>Erts 10.3.2</title>
-
- <section><title>Fixed Bugs and Malfunctions</title>
- <list>
- <item>
- <p>Fixed a bug in <c>seq_trace:reset_trace/0</c> that
- could crash the emulator.</p>
- <p>
- Own Id: OTP-15704</p>
- </item>
- <item>
- <p>
- Fixed bug in <c>process_info(reductions)</c> causing it
- to sometimes return invalid results.</p>
- <p>
- Own Id: OTP-15709 Aux Id: ERIERL-337 </p>
- </item>
- </list>
- </section>
-
-</section>
-
-<section><title>Erts 10.3.1</title>
-
- <section><title>Fixed Bugs and Malfunctions</title>
- <list>
- <item>
- <p>If a suspend/resume signal pair was sent to a process
- while it was executing dirty, the receiving process could
- later end up in a suspended state indefinitely. This bug
- was introduced in ERTS version 10.0 (OTP 21.0).</p>
- <p>Suspend/resume signals are sent from <seealso
- marker="erts:erlang#suspend_process/1"><c>erlang:suspend_process()</c></seealso>/<seealso
- marker="erts:erlang#resume_process/1"><c>erlang:resume_process()</c></seealso>.
- The <seealso
- marker="runtime_tools:dbg"><c>dbg</c></seealso> trace
- tool utilize this functionality and could thus trigger
- this bug.</p>
- <p>
- Own Id: OTP-15688</p>
- </item>
- <item>
- <p>
- Fix a possible deadlock when terminating the ERTS caused
- by a dirty scheduler not releasing it's run-queue lock
- when terminating.</p>
- <p>
- Own Id: OTP-15690 Aux Id: PR-2172 </p>
- </item>
- </list>
- </section>
-
-</section>
-
-<section><title>Erts 10.3</title>
-
- <section><title>Fixed Bugs and Malfunctions</title>
- <list>
- <item>
- <p>When multiplying a number by itself, a word beyond the
- number on the heap could be read (and ignored). This bug
- was extremely unlikely to actually cause a real
- problem.</p>
- <p>
- Own Id: OTP-15484</p>
- </item>
- <item>
- <p>
- Fix bug where doing <c>seq_trace:reset_trace()</c> while
- another process was doing a garbage collection could
- cause the run-time system to segfault.</p>
- <p>
- Own Id: OTP-15490</p>
- </item>
- <item>
- <p>
- Fix reading of ancillary data from packet oriented
- sockets on old Linux kernel versions. Without this fix,
- getting the data would cause the port to enter an
- infinite loop.</p>
- <p>
- Own Id: OTP-15494</p>
- </item>
- <item>
- <p>
- Fix bug where crash dumping or doing
- <c>erlang:system_info(procs)</c> while another process
- was doing a garbage collection could cause the run-time
- system to segfault.</p>
- <p>
- Own Id: OTP-15527</p>
- </item>
- <item>
- <p>
- Fix <c>erlang:system_info(kernel_poll)</c> to return
- correct value. Before this fix, the call always returned
- <c>false</c>.</p>
- <p>
- Own Id: OTP-15556</p>
- </item>
- <item>
- <p>
- Fix bug in <c>enif_make_map_from_arrays</c> that would
- produce broken maps when number of keys were 32. Bug
- exists since OTP 21.0.</p>
- <p>
- Own Id: OTP-15567</p>
- </item>
- <item>
- <p>
- Fix a bug in <c>binary:encode_unsigned</c> that may cause
- a read of uninitialized memory.</p>
- <p>
- The bug existed since the function was added (OTP
- R16B02).</p>
- <p>
- Own Id: OTP-15583 Aux Id: PR-2118 </p>
- </item>
- <item>
- <p>
- Fixed a bug that could cause <c>heart</c> to kill an
- exiting node before it had time to flush all buffered
- writes. If environment variable
- <c>HEART_KILL_SIGNAL=SIGABRT</c> was set a superfluous
- core dump could also be generated.</p>
- <p>
- Own Id: OTP-15599 Aux Id: ERIERL-298 </p>
- </item>
- <item>
- <p>
- Fix <c>enif_consume_timeslice</c> to be a no-op on dirty
- scheduler and not crash debug compiled emulator.</p>
- <p>
- Own Id: OTP-15604</p>
- </item>
- <item>
- <p>
- Fixed macro redefinition warnings.</p>
- <p>
- Own Id: OTP-15629</p>
- </item>
- <item>
- <p>
- <c>to_erl</c> fixed to not garble terminal input beyond
- 7-bit ASCII.</p>
- <p>
- Own Id: OTP-15650 Aux Id: ERL-854, PR-2161 </p>
- </item>
- <item>
- <p>
- Minor fixes for <c>make clean</c>.</p>
- <p>
- Own Id: OTP-15657</p>
- </item>
- <item>
- <p>
- Fixed a bug in all <c>ets:select*</c> and
- <c>ets:match*</c> functions that could in some rare cases
- lead to very poor performance.</p>
- <p>
- Own Id: OTP-15660 Aux Id: ERL-869 </p>
- </item>
- </list>
- </section>
-
-
- <section><title>Improvements and New Features</title>
- <list>
- <item>
- <p>
- Add <c>erlang:system_flag(system_logger, Pid)</c> and
- <c>erlang:system_info(system_logger)</c>. This
- system_flag can be used to set the process that will
- receive the logging messages generated by ERTS.</p>
- <p>
- Own Id: OTP-15375</p>
- </item>
- <item>
- <p><c>integer_to_list/2</c> and
- <c>integer_to_binary/2</c> are now implemented in C,
- improving their performance.</p>
- <p>
- Own Id: OTP-15503 Aux Id: PR-2052 </p>
- </item>
- <item>
- <p>
- Improved <c>term_to_binary</c> to do more fair reduction
- count and yielding when encoding large byte lists
- (strings).</p>
- <p>
- Own Id: OTP-15514 Aux Id: ERL-774 </p>
- </item>
- <item>
- <p>
- Made internal port drivers more robust against
- <c>erlang:port_control</c> with invalid arguments and
- added documentation warnings about such abuse.</p>
- <p>
- Own Id: OTP-15555 Aux Id: ERIERL-231 </p>
- </item>
- <item>
- <p>
- Fix bug on NetBSD where the <c>exit_status</c> from a
- port program would never be sent.</p>
- <p>
- Own Id: OTP-15558 Aux Id: ERL-725 </p>
- </item>
- <item>
- <p>There is a new function <c>persistent:term(Key,
- Default)</c> to allow specifying a default when looking
- up a persistent term.</p>
- <p>
- Own Id: OTP-15576 Aux Id: ERL-843 </p>
- </item>
- <item>
- <p>A transitory emulator option '<c>+ztma true</c>' has
- been added to allow running existing BEAM code that
- relies on "tuple calls" (dispatch on parameterized
- modules) which has been compiled under OTP 20 or earlier.
- This option will be removed in OTP 22, so such modules
- should eventually be recompiled with the
- <c>+tuple_calls</c> option.</p>
- <p>
- Own Id: OTP-15580 Aux Id: PR-2113 </p>
- </item>
- </list>
- </section>
-
-</section>
-
-<section><title>Erts 10.2.5</title>
-
- <section><title>Fixed Bugs and Malfunctions</title>
- <list>
- <item>
- <p>Fixes of install/release phase in build system.</p>
- <list> <item>The source tree was modified when
- installing/releasing and/or applying a patch.</item>
- <item>Some files were installed with wrong access
- rights.</item> <item>If applying a patch (using
- <c>otp_patch_apply</c>) as another user (except root)
- than the user that built the source, the documentation
- was not properly updated.</item> </list>
- <p>
- Own Id: OTP-15551</p>
- </item>
- <item>
- <p>
- Setting the <c>recbuf</c> size of an inet socket the
- <c>buffer</c> is also automatically increased. Fix a bug
- where the auto adjustment of inet buffer size would be
- triggered even if an explicit inet buffer size had
- already been set.</p>
- <p>
- Own Id: OTP-15651 Aux Id: ERIERL-304 </p>
- </item>
- <item>
- <p>
- Reading from UDP using active <c>true</c> or active
- <c>N</c> mode has been optimized when more packets than
- specified by <c>read_packets</c> are available on the
- socket.</p>
- <p>
- Own Id: OTP-15652 Aux Id: ERIERL-304 </p>
- </item>
- </list>
- </section>
-
-</section>
-
-<section><title>Erts 10.2.4</title>
-
- <section><title>Fixed Bugs and Malfunctions</title>
- <list>
- <item>
- <p>
- When using the <c>{linger,{true,T}}</c> option;
- <c>gen_tcp:listen/2</c> used the full linger time before
- returning for example <c>eaddrinuse</c>. This bug has now
- been corrected.</p>
- <p>
- Own Id: OTP-14728 Aux Id: ERIERL-303 </p>
- </item>
- </list>
- </section>
-
-</section>
-
-<section><title>Erts 10.2.3</title>
-
- <section><title>Fixed Bugs and Malfunctions</title>
- <list>
- <item>
- <p>
- Fix bug where doing a <c>gen_tcp:send</c> on a socket
- with <c>delay_send</c> set to true could cause a segfault
- if the other side closes the connection.</p>
- <p>
- Bug was introduced in erts-10.2 (OTP-21.2).</p>
- <p>
- Own Id: OTP-15536 Aux Id: ERL-827 </p>
- </item>
- <item>
- <p>
- Fix a race condition when a port program closes that
- could result in the next started port to hang during
- startup.</p>
- <p>
- When this fault happens the following error is normally
- (but not always) logged:</p>
- <p>
- <c> =ERROR REPORT==== 14-Jan-2019::10:45:52.868246
- ===</c><br/><c> Bad input fd in erts_poll()! fd=11,
- port=#Port&lt;0.505>, driver=spawn, name=/bin/sh -s
- unix:cmd </c></p>
- <p>
- Bug was introduced in erts-10.0 (OTP-21.0).</p>
- <p>
- Own Id: OTP-15537</p>
- </item>
- <item>
- <p>
- Fix a bug where polling for external events could be
- delayed for a very long time if all active schedulers
- were 100% loaded.</p>
- <p>
- Bug was introduced in erts-10.2 (OTP-21.2).</p>
- <p>
- Own Id: OTP-15538 Aux Id: ERIERL-229 </p>
- </item>
- </list>
- </section>
-
-</section>
-
-<section><title>Erts 10.2.2</title>
-
- <section><title>Fixed Bugs and Malfunctions</title>
- <list>
- <item>
- <p>Fixed a crash when dangling files were closed after
- <c>init:restart/0</c>.</p>
- <p>
- Own Id: OTP-15495 Aux Id: ERL-821 </p>
- </item>
- <item>
- <p>
- A bug that could cause dirty schedulers to become
- unresponsive has been fixed.</p>
- <p>
- Own Id: OTP-15509 Aux Id: PR-2027, PR-2093 </p>
- </item>
- </list>
- </section>
-
-</section>
-
-<section><title>Erts 10.2.1</title>
-
- <section><title>Fixed Bugs and Malfunctions</title>
- <list>
- <item>
- <p>
- Fixed bug on big endian architectures when changing file
- permissions or ownership with <c>file:change_mode</c>,
- <c>change_owner</c>, <c>change_group</c> or
- <c>write_file_info</c>. Bug exists since OTP-21.0.</p>
- <p>
- Own Id: OTP-15485</p>
- </item>
- <item>
- <p>
- Fixed bug in <c>atomics</c> with option
- <c>{signed,false}</c> when returned values are <c>(1 bsl
- 63)</c> or larger. Could cause heap corruption leading to
- VM crash or other unpleasant symptoms. Bug exists since
- OTP-21.2 when module <c>atomics</c> was introduced.</p>
- <p>
- Own Id: OTP-15486 Aux Id: PR-2061 </p>
- </item>
- <item>
- <p>
- Fixed bug in operator <c>band</c> of two negative
- operands causing erroneous result if the absolute value
- of one of the operands have the lowest <c>N*W</c> bits as
- zero and the other absolute value is not larger than
- <c>N*W</c> bits. <c>N</c> is an integer of 1 or larger
- and <c>W</c> is 32 or 64 depending on word size.</p>
- <p>
- Own Id: OTP-15487 Aux Id: ERL-804 </p>
- </item>
- </list>
- </section>
-
-</section>
-
-<section><title>Erts 10.2</title>
-
- <section><title>Fixed Bugs and Malfunctions</title>
- <list>
- <item>
- <p>
- When a process was waiting for a TCP socket send
- operation to complete, and another process closed the
- socket during that send, the sending process could hang.
- This bug has now been corrected.</p>
- <p>
- Own Id: OTP-12242 Aux Id: ERL-561 </p>
- </item>
- <item>
- <p>
- Document <c>bit_size</c> in match specifications and
- allow it in <c>ets:fun2ms</c>.</p>
- <p>
- Own Id: OTP-15343 Aux Id: PR-1962 </p>
- </item>
- <item>
- <p>
- Fixed bug in <c>ets:select_replace</c> when called with a
- fully bound key could cause a following call to
- <c>ets:next</c> or <c>ets:prev</c> to crash the emulator
- or return invalid result.</p>
- <p>
- Own Id: OTP-15346</p>
- </item>
- <item>
- <p>When a module has been purged from memory, any
- literals belonging to that module will be copied to all
- processes that hold references to them. The max heap size
- limit would be ignored in the garbage collection
- initiated when copying literals to a process. If the max
- heap size was exceeded, the process would typically be
- terminated in the following garbage collection. Corrected
- to terminate the process directly if copying a literal
- would exceed the max heap size.</p>
- <p>
- Own Id: OTP-15360</p>
- </item>
- <item>
- <p>
- Fix compilation of run_erl on Solaris 11.4 and later.</p>
- <p>
- Own Id: OTP-15389</p>
- </item>
- <item>
- <p>Fixed a bug where <c>lists:reverse/1-2</c> could use
- far too many reductions. This bug was introduced in
- <c>OTP 21.1</c>.</p>
- <p>
- Own Id: OTP-15436</p>
- </item>
- <item>
- <p>Fixed a bug where a dirty scheduler could stay awake
- forever if a distribution entry was removed as part of a
- dirty GC.</p>
- <p>
- Own Id: OTP-15446 Aux Id: PR-2024 </p>
- </item>
- <item>
- <p>
- Fix microstate accounting handing in various places. Most
- importantly the GC states when the GC is run on a dirty
- scheduler are now managed correctly.</p>
- <p>
- Own Id: OTP-15450 Aux Id: ERIERL-229 </p>
- </item>
- <item>
- <p>
- Fixed bug in <c>file:sendfile</c> when the send operation
- failed. For sockets in <c>active</c> modes it could cause
- emulator crash or a hanging call. For sockets with
- <c>{active,false}</c> an unexpected <c>{inet_reply, _,
- _}</c> message could be sent to the calling process. The
- bug exists since OTP-21.0.</p>
- <p>
- Own Id: OTP-15461 Aux Id: ERL-784 </p>
- </item>
- <item>
- <p>
- The erts configure script has been updated to reject any
- CFLAGS that does not have <c>-O</c>. This in order to
- prevent the common mistake of forgetting to add
- <c>-O2</c> to custom CFLAGS.</p>
- <p>
- Own Id: OTP-15465</p>
- </item>
- <item>
- <p>
- Fix reduction count in lists:member/2</p>
- <p>
- Own Id: OTP-15474 Aux Id: ERIERL-229 </p>
- </item>
- </list>
- </section>
-
-
- <section><title>Improvements and New Features</title>
- <list>
- <item>
- <p>
- New <c>counters</c> and <c>atomics</c> modules supplies
- access to highly efficient operations on mutable fixed
- word sized variables.</p>
- <p>
- Own Id: OTP-13468</p>
- </item>
- <item>
- <p>There is a new module <c>persistent_term</c> that
- implements a term storage suitable for terms that are
- frequently used but never or infrequently updated.
- Lookups are done in constant time without copying the
- terms.</p>
- <p>
- Own Id: OTP-14669 Aux Id: PR-1989 </p>
- </item>
- <item>
- <p>
- A function <c>inet:getifaddrs/1</c> that takes a list
- with a namespace option has been added, for platforms
- that support that feature, for example Linux (only?).</p>
- <p>
- Own Id: OTP-15121 Aux Id: ERIERL-189, PR-1974 </p>
- </item>
- <item>
- <p>Added the <c>nopush</c> option for TCP sockets, which
- corresponds to <c>TCP_NOPUSH</c> on *BSD and
- <c>TCP_CORK</c> on Linux.</p>
- <p>This is also used internally in <c>file:sendfile</c>
- to reduce latency on subsequent send operations.</p>
- <p>
- Own Id: OTP-15357 Aux Id: ERL-698 </p>
- </item>
- <item>
- <p>List subtraction (The <c>--</c> operator) will now
- yield properly on large inputs.</p>
- <p>
- Own Id: OTP-15371</p>
- </item>
- <item>
- <p>
- Optimize handling of send_delay for tcp sockes to better
- work with the new pollthread implementation introduced in
- OTP-21.</p>
- <p>
- Own Id: OTP-15471 Aux Id: ERIERL-229 </p>
- </item>
- <item>
- <p>
- Optimize driver_set_timer with a zero timeout to
- short-circuit and not create any timer structure, but
- instead schedule the timer immediately.</p>
- <p>
- Own Id: OTP-15472 Aux Id: ERIERL-229 </p>
- </item>
- <item>
- <p>
- Add <c>erl_xcomp_code_model_small</c> as a cross
- configure variable in order to let the emulator be build
- with the assumption that a small code model will be used
- on the target machine.</p>
- <p>
- Own Id: OTP-15473 Aux Id: ERIERL-229 </p>
- </item>
- <item>
- <p>
- Add a new pollset that is made to handle sockets that use
- <c>{active, true}</c> or <c>{active, N}</c>. The new
- pollset will not be polled by a pollthread, but instead
- polled by a normal scheduler.</p>
- <p>
- This change was made because of the overhead associated
- with constantly having to re-apply the ONESHOT mechanism
- on fds that all input events were interesting.</p>
- <p>
- The new pollset is only active on platforms that support
- concurrent kernel poll updates, i.e. Linux and BSD.</p>
- <p>
- Own Id: OTP-15475 Aux Id: ERIERL-229 </p>
- </item>
- <item>
- <p>
- Fix bug where emulator would segfault if a literal
- message was sent when sequence tracing was enabled.</p>
- <p>
- Own Id: OTP-15478 Aux Id: ERL-741 </p>
- </item>
- </list>
- </section>
-
-</section>
-
-<section><title>Erts 10.1.3</title>
-
- <section><title>Improvements and New Features</title>
- <list>
- <item>
- <p>Added an optional <c>./configure</c> flag to compile
- the emulator with spectre mitigation:
- <c>--with-spectre-mitigation</c></p>
- <p>Note that this requires a recent version of GCC with
- support for spectre mitigation and the
- <c>--mindirect-branch=thunk</c> flag, such as
- <c>8.1</c>.</p>
- <p>
- Own Id: OTP-15430 Aux Id: ERIERL-237 </p>
- </item>
- </list>
- </section>
-
-</section>
-
-<section><title>Erts 10.1.2</title>
-
- <section><title>Fixed Bugs and Malfunctions</title>
- <list>
- <item>
- <p>Fixed a rare bug where files could be closed on a
- normal instead of an IO scheduler, resulting in system
- instability if the operation blocked.</p>
- <p>
- Own Id: OTP-15421</p>
- </item>
- </list>
- </section>
-
-</section>
-
-<section><title>Erts 10.1.1</title>
-
- <section><title>Fixed Bugs and Malfunctions</title>
- <list>
- <item>
- <p>
- A bug where the socket option 'pktoptions' caused a read
- of uninitialized memory has been fixed. Would cause
- malfunction on FreeBSD.</p>
- <p>
- Own Id: OTP-14297 Aux Id: OTP-15141 </p>
- </item>
- <item>
- <p>Fixed a memory leak on errors when reading files.</p>
- <p>
- Own Id: OTP-15318</p>
- </item>
- <item>
- <p>File access through UNC paths works again on Windows.
- This regression was introduced in OTP 21.</p>
- <p>
- Own Id: OTP-15333 Aux Id: ERL-737 </p>
- </item>
- </list>
- </section>
-
-</section>
-
-<section><title>Erts 10.1</title>
-
- <section><title>Fixed Bugs and Malfunctions</title>
- <list>
- <item>
- <p>
- Fix the seq_trace token to not be cleared when a process
- receives messages sent by erts. Some examples of when
- this could happen is all port BIFs, i.e.
- <c>open_port</c>, <c>port_command</c> etc etc.</p>
- <p>
- Fix so that messages sent by nifs can be traced using
- normal and <c>seq_trace</c> tracing.</p>
- <p>
- Own Id: OTP-15038 Aux Id: ERL-602 </p>
- </item>
- <item>
- <p>
- Fixed specs and documentation for <c>process_info</c>
- item <c>monitored_by</c> to include port identifiers and
- nif resources as possible types.</p>
- <p>
- Own Id: OTP-15180 Aux Id: ERL-648 </p>
- </item>
- <item>
- <p>
- Fix bug in generation of erl_crash.dump, which could
- cause VM to crash.</p>
- <p>
- Bug exist since erts-9.2 (OTP-20.2).</p>
- <p>
- Own Id: OTP-15181</p>
- </item>
- <item>
- <p>
- Fix bug where ctrl-break or ctrl-c would not trigger the
- break mode properly on Windows. This bug was introduced
- in erts-10.0 (OTP-21).</p>
- <p>
- Own Id: OTP-15205</p>
- </item>
- <item>
- <p>
- Fix a performance bug for reception of UDP packages,
- where a memory buffer would be reallocated when it should
- not have been.</p>
- <p>
- Introduce a limit on the maximum automatic increase of
- the UDP user-space buffer to the theoretical max of the
- network PATH, i.e. 65535.</p>
- <p>
- Own Id: OTP-15206</p>
- </item>
- <item>
- <p>
- Fix alignment of erts allocator state internally in erts.
- With the improper alignment the emulator would refuse to
- start when compiled with clang on 32-bit systems.</p>
- <p>
- Own Id: OTP-15208 Aux Id: PR-1897 ERL-677 </p>
- </item>
- <item>
- <p>
- Fix bug where too many concurrent calls to
- <c>erlang:open_port({spawn,"cmd"},...)</c> would result
- in the emulator terminating with the reason "Failed to
- write to erl_child_setup: ". After this fix the
- <c>open_port</c> call will throw an <c>emfile</c>
- exception instead.</p>
- <p>
- Own Id: OTP-15210</p>
- </item>
- <item>
- <p>
- Upgraded the ERTS internal PCRE library from version 8.41
- to version 8.42. See <url
- href="http://pcre.org/original/changelog.txt">http://pcre.org/original/changelog.txt</url>
- for information about changes made to PCRE. This library
- implements major parts of the <seealso
- marker="stdlib:re"><c>re</c></seealso> regular
- expressions module.</p>
- <p>
- Own Id: OTP-15217</p>
- </item>
- <item>
- <p>
- Fix <c>open_port({fd,X,Y}, ...)</c> to release the file
- descriptors from the pollset when closing the port.
- Without this fix the same file descriptor number could
- not be reused when doing multiple open_port and
- port_close sequences.</p>
- <p>
- Own Id: OTP-15236 Aux Id: ERL-692 </p>
- </item>
- <item>
- <p>
- Fixed bug in <c>float_to_list/2</c> and
- <c>float_to_binary/2</c> with options
- <c>[{decimals,0},compact]</c> causing totally wrong
- results. Bug exists since OTP-21.0.</p>
- <p>
- Own Id: OTP-15276 Aux Id: PR-1920 </p>
- </item>
- <item>
- <p>
- Fixed bug in <c>erlang:memory</c> causing <c>ets</c> to
- report too much. This small false memory leak (16 bytes
- each time) can only happen when a specific race condition
- occurs between scheduler threads on a table with option
- <c>write_concurrency</c>.</p>
- <p>
- Own Id: OTP-15278</p>
- </item>
- <item>
- <p>
- Minor <c>configure</c> test fixes</p>
- <p>
- Own Id: OTP-15282</p>
- </item>
- <item>
- <p>
- Improved robustness of distribution connection setup. In
- OTP-21.0 a truly asynchronous connection setup was
- introduced. This is further improvement on that work to
- make the emulator more robust and also be able to recover
- in cases when involved Erlang processes misbehave.</p>
- <p>
- Own Id: OTP-15297 Aux Id: OTP-15279, OTP-15280 </p>
- </item>
- </list>
- </section>
-
-
- <section><title>Improvements and New Features</title>
- <list>
- <item>
- <p>
- The socket options <c>recvtos</c>, <c>recvttl</c>,
- <c>recvtclass</c> and <c>pktoptions</c> have been
- implemented in the socket modules. See the documentation
- for the <c>gen_tcp</c>, <c>gen_udp</c> and <c>inet</c>
- modules. Note that support for these in the runtime
- system is platform dependent. Especially for
- <c>pktoptions</c> which is very Linux specific and
- obsoleted by the RFCs that defined it.</p>
- <p>
- Own Id: OTP-15145 Aux Id: ERIERL-187 </p>
- </item>
- </list>
- </section>
-
-</section>
-
-<section><title>Erts 10.0.8</title>
-
- <section><title>Fixed Bugs and Malfunctions</title>
- <list>
- <item>
- <p>
- As of ERTS version 10.0 (OTP 21.0) the
- <c>erl_child_setup</c> program, which creates port
- programs, ignores <c>TERM</c> signals. This setting was
- unintentionally inherited by port programs. Handling of
- <c>TERM</c> signals in port programs has now been
- restored to the default behavior. That is, terminate the
- process.</p>
- <p>
- Own Id: OTP-15289 Aux Id: ERIERL-235, OTP-14943, ERL-576 </p>
- </item>
- <item>
- <p>
- The fix made for OTP-15279 in erts-10.07 (OTP-21.0.8) was
- not complete. It could cause a new connection attempt to
- be incorrectly aborted in certain cases. This fix will
- amend that flaw.</p>
- <p>
- Own Id: OTP-15296 Aux Id: OTP-15279, ERIERL-226 </p>
- </item>
- </list>
- </section>
-
-</section>
-
-<section><title>Erts 10.0.7</title>
-
- <section><title>Fixed Bugs and Malfunctions</title>
- <list>
- <item>
- <p>
- A process could get stuck in an infinite rescheduling
- loop between normal and dirty schedulers. This bug was
- introduced in ERTS version 10.0.</p>
- <p>
- Thanks to Maxim Fedorov for finding and fixing this
- issue.</p>
- <p>
- Own Id: OTP-15275 Aux Id: PR-1943 </p>
- </item>
- <item>
- <p>
- Garbage collection of a distribution entry could cause an
- emulator crash if <c>net_kernel</c> had not brought
- previous connection attempts on it down properly.</p>
- <p>
- Own Id: OTP-15279 Aux Id: ERIERL-226 </p>
- </item>
- </list>
- </section>
-
-</section>
-
-<section><title>Erts 10.0.6</title>
-
- <section><title>Fixed Bugs and Malfunctions</title>
- <list>
- <item>
- <p>
- A race between termination of a process and resume of the
- same process via <c>erlang:resume_process/1</c> could
- cause the VM to crash. This bug was introduced in erts
- version 10.0 (OTP 21.0).</p>
- <p>
- Own Id: OTP-15237</p>
- </item>
- <item>
- <p>
- When tracing on <c>running</c>, <c>in</c> trace events
- could be lost when a process was rescheduled between a
- dirty and a normal scheduler.</p>
- <p>
- Own Id: OTP-15269 Aux Id: ERL-713 </p>
- </item>
- </list>
- </section>
-
-</section>
-
-<section><title>Erts 10.0.5</title>
-
- <section><title>Fixed Bugs and Malfunctions</title>
- <list>
- <item>
- <p>
- Fixed a bug which caused an emulator crash when
- <c>enif_send()</c> was called by a NIF that executed on a
- dirty scheduler. The bug was either triggered when the
- NIF called <c>enif_send()</c> without a message
- environment, or when the process executing the NIF was
- <c>send</c> traced.</p>
- <p>
- Own Id: OTP-15223</p>
- </item>
- <item>
- <p>
- Fixed a bug causing some Erlang references to be
- inconsistently ordered. This could for example cause
- failure to look up certain elements with references as
- keys in search data structures. This bug was introduced
- in R13B02.</p>
- <p>
- Thanks to Simon Cornish for finding the bug and supplying
- a fix.</p>
- <p>
- *** POTENTIAL INCOMPATIBILITY ***</p>
- <p>
- Own Id: OTP-15225</p>
- </item>
- </list>
- </section>
-
-</section>
-
-<section><title>Erts 10.0.4</title>
-
- <section><title>Fixed Bugs and Malfunctions</title>
- <list>
- <item>
- <p>Fixed a bug that prevented the <c>noshell</c> option
- from working correctly on Mac OS X and BSD.</p>
- <p>
- Own Id: OTP-15169</p>
- </item>
- <item>
- <p>Fixed a crash when matching directly against a literal
- map using a single key that had been saved on the
- stack.</p>
- <p>
- Own Id: OTP-15184</p>
- </item>
- <item>
- <p>Fix node crash when passing a bad time option to
- <c>file:read_file_info/2</c>.</p>
- <p>
- Own Id: OTP-15196</p>
- </item>
- </list>
- </section>
-
-</section>
-
-<section><title>Erts 10.0.3</title>
-
- <section><title>Fixed Bugs and Malfunctions</title>
- <list>
- <item>
- <p>Fixed a scheduler bug that caused normal schedulers to
- run dirty code.</p>
- <p>
- Own Id: OTP-15154</p>
- </item>
- <item>
- <p>
- Fixed a bug in <c>erlang:trace_info/2</c> which caused
- the emulator to crash when a bad argument was passed. The
- bug was introduced in ERTS version 10.0.</p>
- <p>
- Own Id: OTP-15183 Aux Id: ERL-670 </p>
- </item>
- </list>
- </section>
-
-</section>
-
-<section><title>Erts 10.0.2</title>
-
- <section><title>Fixed Bugs and Malfunctions</title>
- <list>
- <item>
- <p>Fixed a rare bug that could cause processes to be
- scheduled after they had been freed.</p>
- <p>
- Own Id: OTP-15067 Aux Id: ERL-573 </p>
- </item>
- <item>
- <p>Fixed a race condition in the inet driver that could
- cause receive to hang when the emulator was compiled with
- gcc 8.</p>
- <p>
- Own Id: OTP-15158 Aux Id: ERL-654 </p>
- </item>
- </list>
- </section>
-
-</section>
-
-<section><title>Erts 10.0.1</title>
-
- <section><title>Fixed Bugs and Malfunctions</title>
- <list>
- <item>
- <p>The keys used in <c>os:getenv</c> and <c>os:putenv</c>
- are case-insensitive again on Windows.</p>
- <p>
- Own Id: OTP-15147 Aux Id: ERL-644 </p>
- </item>
- </list>
- </section>
-
-</section>
-
-<section><title>Erts 10.0</title>
-
- <section><title>Fixed Bugs and Malfunctions</title>
- <list>
- <item>
- <p>
- The type specifications for <c>file:posix/0</c> and
- <c>inet:posix/0</c> have been updated according to which
- errors file and socket operations should be able to
- return.</p>
- <p>
- Own Id: OTP-14019 Aux Id: ERL-550 </p>
- </item>
- <item>
- <p>
- Fix error printout from run_erl and a bug that could
- cause unintended fds to be leaked into the started
- program.</p>
- <p>
- Own Id: OTP-14537 Aux Id: PR1529 </p>
- </item>
- <item>
- <p> File operations used to accept <seealso
- marker="kernel:file#type-name_all">filenames</seealso>
- containing null characters (integer value zero). This
- caused the name to be truncated and in some cases
- arguments to primitive operations to be mixed up.
- Filenames containing null characters inside the filename
- are now <em>rejected</em> and will cause primitive file
- operations to fail. </p> <p> Also environment variable
- operations used to accept <seealso
- marker="kernel:os#type-env_var_name">names</seealso> and
- <seealso
- marker="kernel:os#type-env_var_value">values</seealso> of
- environment variables containing null characters (integer
- value zero). This caused operations to silently produce
- erroneous results. Environment variable names and values
- containing null characters inside the name or value are
- now <em>rejected</em> and will cause environment variable
- operations to fail. </p> <p>Primitive environment
- variable operations also used to accept the <c>$=</c>
- character in environment variable names causing various
- problems. <c>$=</c> characters in environment variable
- names are now also <em>rejected</em>. </p> <p>Also
- <seealso
- marker="kernel:os#cmd/1"><c>os:cmd/1</c></seealso> now
- reject null characters inside its <seealso
- marker="kernel:os#type-os_command">command</seealso>.
- </p> <p><seealso
- marker="erts:erlang#open_port/2"><c>erlang:open_port/2</c></seealso>
- will also reject null characters inside the port name
- from now on.</p>
- <p>
- *** POTENTIAL INCOMPATIBILITY ***</p>
- <p>
- Own Id: OTP-14543 Aux Id: ERL-370 </p>
- </item>
- <item>
- <p>
- Fix bugs related to the bookkeeping of microstate
- accounting states.</p>
- <p>
- Own Id: OTP-14652</p>
- </item>
- <item>
- <p><c>os:putenv</c> and <c>os:getenv</c> no longer access
- the process environment directly and instead work on a
- thread-safe emulation. The only observable difference is
- that it's <em>not</em> kept in sync with libc
- <c>getenv(3)</c> / <c>putenv(3)</c>, so those who relied
- on that behavior in drivers or NIFs will need to add
- manual synchronization.</p> <p>On Windows this means that
- you can no longer resolve DLL dependencies by modifying
- the <c>PATH</c> just before loading the driver/NIF. To
- make this less of a problem, the emulator now adds the
- target DLL's folder to the DLL search path.</p>
- <p>
- *** POTENTIAL INCOMPATIBILITY ***</p>
- <p>
- Own Id: OTP-14666</p>
- </item>
- <item>
- <p>Corrected <c>erlang:is_builtin(erlang, M, F)</c> to
- return <c>true</c> for <c>apply/2</c> and
- <c>yield/0</c>.</p>
- <p>
- Own Id: OTP-14713 Aux Id: ERL-500 </p>
- </item>
- <item>
- <p>Fixed a bug where the PATH environment variable wasn't
- updated correctly on a release downgrade, effectively
- keeping the PATH of the new release.</p>
- <p>
- Own Id: OTP-14719</p>
- </item>
- <item>
- <p>A receive optimization that avoids scanning the entire
- message queue when receiving a message containing a
- freshly created reference could in rare circumstances
- (involving recursive calls to the functions that does the
- receive) cause the receive to hang. This has been
- corrected.</p>
- <p>
- Own Id: OTP-14782 Aux Id: ERL-511 </p>
- </item>
- <item>
- <p>
- Fix building of Erlang/OTP on platforms which have small
- data area with short addressing. For example the
- PowerPC/RTEMS platform.</p>
- <p>
- Own Id: OTP-14909 Aux Id: PR-1692 </p>
- </item>
- <item>
- <p>Fixed a crash when <c>enif_make_binary</c> is called
- with a binary produced by <c>enif_inspect_binary</c> in a
- different environment.</p>
- <p>
- Own Id: OTP-14931</p>
- </item>
- <item>
- <p>Fixed a crash when <c>enif_make_binary</c> is called
- more than once with a binary that had previously been
- added to an <c>enif_ioq</c>.</p>
- <p>
- Own Id: OTP-14932</p>
- </item>
- <item>
- <p>
- The erl_child_setup program now ignores SIGTERM signals.</p>
- <p>
- Own Id: OTP-14943 Aux Id: ERL-576 </p>
- </item>
- <item>
- <p>
- Force 64-bit alignment on pre-allocators on architectures
- which needs it.</p>
- <p>
- Own Id: OTP-14977</p>
- </item>
- <item>
- <p>
- Fixed a bug where dirty scheduler picked up non-dirty
- work.</p>
- <p>
- Own Id: OTP-14978</p>
- </item>
- <item>
- <p>
- Calls to <c>gen_tcp:send/2</c> on closed sockets now
- returns <c>{error, closed}</c> instead of
- <c>{error,enotconn}</c>.</p>
- <p>
- Own Id: OTP-15001</p>
- </item>
- <item>
- <p>
- <c>erlang:monotonic_time/1</c> failed with <c>badarg</c>
- when passing the <c>perf_counter</c> time unit as
- argument.</p>
- <p>
- Own Id: OTP-15008</p>
- </item>
- <item>
- <p>
- Fix bug where rapid <c>init:restart()</c> calls would
- sometimes crash because a code load request leaked in
- between the restarts.</p>
- <p>
- Own Id: OTP-15013</p>
- </item>
- <item>
- <p>
- Improve <c>float_to_list(F, [{decimals,D}])</c> to closer
- conform with <c>io_lib:format("~.*f", [D,F])</c>.</p>
- <p>
- There are however, still cases when <c>float_to_list</c>
- does not produce the exact same result as
- <c>io_lib:format</c>, especially for large values
- <c>F</c> and/or many decimals <c>D</c>.</p>
- <p>
- Own Id: OTP-15015 Aux Id: OTP-14890 </p>
- </item>
- <item>
- <p>Fixed a deadlock that would occur on certain
- allocators when a reallocation failed with <c>+ramv</c>
- enabled.</p>
- <p>
- Own Id: OTP-15024</p>
- </item>
- <item>
- <p>
- Fix bug that made it impossible to use an erl_tracer as
- the seq_trace trace receiver.</p>
- <p>
- Own Id: OTP-15029</p>
- </item>
- <item>
- <p>
- Fix bug where a large (> 1 GB) emulator generated error
- logger message would cause the emulator to crash.</p>
- <p>
- Own Id: OTP-15032</p>
- </item>
- <item>
- <p>The emulator will no longer crash when reading the
- file information of an ordinary file that has an NTFS
- reparse point, such as files stored in a OneDrive-mapped
- folder.</p>
- <p>
- Own Id: OTP-15062 Aux Id: ERL-615 </p>
- </item>
- <item>
- <p>
- Fixed bug in <c>enif_binary_to_term</c> which could cause
- memory corruption for immediate terms (atoms, small
- integers, pids, ports, empty lists).</p>
- <p>
- Own Id: OTP-15080</p>
- </item>
- <item>
- <p>
- Fixed bug in <c>erlang:system_profile/2</c> that could
- cause superfluous <c>{profile,_,active,_,_}</c> messages
- for terminating processes.</p>
- <p>
- Own Id: OTP-15085</p>
- </item>
- <item>
- <p>
- On OSs with per thread CPU time support, change
- <c>cpu_timestamp</c> in <seealso
- marker="erlang#trace/3">erlang:trace/3</seealso> to use
- it instead of per process CPU time. This makes this
- option useable on such OSs when running multiple
- schedulers.</p>
- <p>
- Own Id: OTP-15090</p>
- </item>
- <item>
- <p>
- Fix segfault in abort_signal_task which could happen if a
- port terminated while there were outstanding port tasks
- that were not signals, for example a
- ready_input/ready_output event.</p>
- <p>
- Own Id: OTP-15108 Aux Id: ERL-621 </p>
- </item>
- <item>
- <p>
- Fixed bug in <c>ets</c> that could cause VM crash if
- process A terminates after fixating a table and process B
- deletes the table at "the same time". The table fixation
- could be done with <c>ets:safe_fixtable</c> or if process
- A terminates in the middle of a long running
- <c>select</c> or <c>match</c> call.</p>
- <p>
- Own Id: OTP-15109</p>
- </item>
- <item>
- <p>Owner and group changes through
- <c>file:write_file_info</c>, <c>file:change_owner</c>,
- and <c>file:change_group</c> will no longer report
- success on permission errors.</p>
- <p>
- *** POTENTIAL INCOMPATIBILITY ***</p>
- <p>
- Own Id: OTP-15118</p>
- </item>
- <item>
- <p>
- Fix a bug error reporting from escripts on windows where
- the error message would get garbled.</p>
- <p>
- Own Id: OTP-15119 Aux Id: PR-1826 </p>
- </item>
- <item>
- <p>
- Fix segfault when a process is interally re-scheduled
- while being traced for in out events. This bug was
- introduced in erts-8.0 (OTP-19.0).</p>
- <p>
- Own Id: OTP-15125</p>
- </item>
- </list>
- </section>
-
-
- <section><title>Improvements and New Features</title>
- <list>
- <item>
- <p>It is now possible to open device files and FIFOs with
- <c>file:open/2</c>.</p>
- <p>
- Own Id: OTP-11462</p>
- </item>
- <item>
- <p>
- The <c>erlang:system_flag(scheduler_wall_time,Bool)</c>
- call is now reference counted and will be turned off if
- the (last) process that started the performance
- statistics dies. Thus it is no longer possible to start
- the statistics with <c>rpc:call(Node, erlang,
- system_flag, [scheduler_wall_time, true])</c> since it
- will be turned off directly afterwards when the rpc
- process dies.</p>
- <p>
- *** POTENTIAL INCOMPATIBILITY ***</p>
- <p>
- Own Id: OTP-11694</p>
- </item>
- <item>
- <p>A new logging API is added to Erlang/OTP, see the
- <seealso
- marker="kernel:logger"><c>logger(3)</c></seealso> manual
- page, and section <seealso
- marker="kernel:logger_chapter">Logging</seealso> in the
- Kernel User's Guide.</p>
- <p>Calls to <c>error_logger</c> are automatically
- redirected to the new API, and legacy error logger event
- handlers can still be used. It is, however, recommended
- to use the Logger API directly when writing new code.</p>
- <p>Notice the following potential incompatibilities:</p>
- <list> <item><p>Kernel configuration parameters
- <c>error_logger</c> still works, but is overruled if the
- default handler's output destination is configured with
- Kernel configuration parameter <c>logger</c>.</p> <p>In
- general, parameters for configuring error logger are
- overwritten by new parameters for configuring
- Logger.</p></item> <item><p>The concept of SASL error
- logging is deprecated, meaning that by default the SASL
- application does not affect which log events are
- logged.</p> <p>By default, supervisor reports and crash
- reports are logged by the default Logger handler started
- by Kernel, and end up at the same destination (terminal
- or file) as other standard log event from Erlang/OTP.</p>
- <p>Progress reports are not logged by default, but can be
- enabled by setting the primary log level to info, for
- example with the Kernel configuration parameter
- <c>logger_level</c>.</p> <p>To obtain backwards
- compatibility with the SASL error logging functionality
- from earlier releases, set Kernel configuration parameter
- <c>logger_sasl_compatible</c> to <c>true</c>. This
- prevents the default Logger handler from logging any
- supervisor-, crash-, or progress reports. Instead, SASL
- adds a separate Logger handler during application start,
- which takes care of these log events. The SASL
- configuration parameters <c>sasl_error_logger</c> and
- <c>sasl_errlog_type</c> specify the destination (terminal
- or file) and severity level to log for these
- events.</p></item></list>
- <p>
- Since Logger is new in Erlang/OTP 21.0, we do reserve the
- right to introduce changes to the Logger API and
- functionality in patches following this release. These
- changes might or might not be backwards compatible with
- the initial version.</p>
- <p>
- *** POTENTIAL INCOMPATIBILITY ***</p>
- <p>
- Own Id: OTP-13295</p>
- </item>
- <item>
- <p>
- <c>gen_sctp:connect_init/4</c> or rather connect in
- <c>inet_drv.c</c> for SCTP has been fixed to not check
- the write file descriptor for writeability after a
- connect, since for SCTP (SOCK_SEQPACKET) that property
- does not seem to be any kind of indicator for when a
- connect has finished. This fixes connects that the OS
- returned as "in progress" that was misinterpreted by
- <c>gen_sctp:connect_init</c> as failed.</p>
- <p>
- Own Id: OTP-13760 Aux Id: PR-1592 </p>
- </item>
- <item>
- <p>The file driver has been rewritten as a NIF,
- decreasing the latency of file operations. Notable
- incompatibilities are:</p> <list> <item><p>The
- <c>use_threads</c> option for <c>file:sendfile/5</c> no
- longer has any effect; we either use non-blocking
- <c>sendfile(2)</c> or fall back to <c>file:read</c> +
- <c>gen_tcp:send</c>. </p></item> <item><p>The
- file-specific DTrace probes have been removed. The same
- effect can be achieved with normal tracing together with
- the <c>nif__entry</c>/<c>nif__return</c> probes to track
- scheduling.</p></item> </list>
- <p>
- *** POTENTIAL INCOMPATIBILITY ***</p>
- <p>
- Own Id: OTP-14256</p>
- </item>
- <item>
- <p>The I/O polling functionality of erts has been
- re-written to better make use of the OSs polling
- mechanisms. This change means that erts will now always
- prefer to use a kernel-polling mechanism if possible.
- Also all of the I/O polling has been moved to dedicated
- threads instead of being placed in the scheduler
- loops.</p> <p>As a result of this, the <c>erl</c> options
- <c>+K</c> and <c>+secio</c> have been removed. It is
- still possible to disable kernel-poll, but it has to be
- done at compile time through the configure option
- <c>--disable-kernel-poll</c>.</p> <p>The new <c>erl</c>
- options <seealso marker="erl#+IOt"><c>+IOt</c></seealso>
- and <seealso marker="erl#+IOp"><c>+IOp</c></seealso> can
- be used to change how many IO poll threads and poll sets
- that erts should use. See their respective documentation
- for more details.</p>
- <p>
- Own Id: OTP-14346</p>
- </item>
- <item>
- <p>Truly asynchronous auto-connect. Earlier, when
- <c>erlang:send</c> was aimed toward an unconnected node,
- the function would not return until the connection setup
- had completed (or failed). Now the function returns
- directly after the message has been enqueued and the
- connection setup started.</p>
- <p>The same applies to all distributed operations that
- may trigger auto-connect, i.e. <c>'!'</c>, <c>send</c>,
- <c>link</c>, <c>monitor</c>, <c>monitor_node</c>,
- <c>exit/2</c> and <c>group_leader</c>.</p>
- <p>The interface for all these functions are unchanged as
- they do not return connection failures. The only
- exception is <c>erlang:monitor</c> where a <em>possible
- incompatibility</em> is introduced: An attempt to monitor
- a process on a primitive node (such as erl_interface or
- jinterface), where remote process monitoring is not
- implemented, will no longer fail with <c>badarg</c>
- exception. Instead a monitor will be created, but it will
- only supervise the connection to the node.</p>
- <p>
- *** POTENTIAL INCOMPATIBILITY ***</p>
- <p>
- Own Id: OTP-14370</p>
- </item>
- <item>
- <p>Changed the default behaviour of <c>.erlang</c>
- loading: <c>.erlang</c> is no longer loaded from the
- current directory. <c>c:erlangrc(PathList)</c> can be
- used to search and load an <c>.erlang</c> file from user
- specified directories.</p> <p><c>escript</c>,
- <c>erlc</c>, <c>dialyzer</c> and <c>typer</c> no longer
- load an <c>.erlang</c> at all.</p>
- <p>
- *** POTENTIAL INCOMPATIBILITY ***</p>
- <p>
- Own Id: OTP-14439</p>
- </item>
- <item>
- <p>
- New functionality for implementation of alternative
- carriers for the Erlang distribution has been introduced.
- This mainly consists of support for usage of distribution
- controller processes (previously only ports could be used
- as distribution controllers). For more information see
- <seealso marker="erts:alt_dist#distribution_module">ERTS
- User's Guide ➜ How to implement an Alternative Carrier
- for the Erlang Distribution ➜ Distribution
- Module</seealso>.</p>
- <p>
- Own Id: OTP-14459</p>
- </item>
- <item>
- <p>
- Add support for the lcc compiler and in extension the
- Elbrus 2000 platform.</p>
- <p>
- Own Id: OTP-14492</p>
- </item>
- <item>
- <p>Support for "tuple calls" have been removed from the
- run-time system. Tuple calls was an undocumented and
- unsupported feature which allowed the module argument for
- an apply operation to be a tuple: <c>Var = dict:new(),
- Var:size()</c>. This "feature" frequently caused
- confusion, especially when such call failed. The
- stacktrace would point out functions that don't exist in
- the source code.</p>
- <p>For legacy code that need to use parameterized modules
- or tuple calls for some other reason, there is a new
- compiler option called <c>tuple_calls</c>. When this
- option is given, the compiler will generate extra code
- that emulates the old behavior for calls where the module
- is a variable.</p>
- <p>
- *** POTENTIAL INCOMPATIBILITY ***</p>
- <p>
- Own Id: OTP-14497</p>
- </item>
- <item>
- <p>Creation of small maps with literal keys has been
- optimized to be faster and potentially use less memory.
- The keys are combined into a literal key tuple which is
- put into the literal pool. The key tuple can be shared
- between many instances of maps having the same keys.</p>
- <p>
- Own Id: OTP-14502</p>
- </item>
- <item>
- <p>
- When an exception is thrown, include the arguments of the
- call in the stacktrace for BIFs <c>band</c>, <c>bor</c>,
- <c>bsl</c>, <c>bsr</c>, <c>bxor</c>, <c>div</c>,
- <c>rem</c> and the operators <c>+</c>, <c>-</c>, <c>*</c>
- and <c>/</c>.</p>
- <p>
- *** POTENTIAL INCOMPATIBILITY ***</p>
- <p>
- Own Id: OTP-14508</p>
- </item>
- <item>
- <p>
- The non-smp emulators have been removed. This means that
- the configure options <c>--disable-threads</c> and
- <c>--enable-plain-emulator</c> have been removed and
- configure will now refuse to build Erlang/OTP on
- platforms without thread support.</p>
- <p>
- In order to achieve a similar setup as the non-smp
- emulator, it is possible to start Erlang/OTP with the
- <c>+S 1</c> option.</p>
- <p>
- *** POTENTIAL INCOMPATIBILITY ***</p>
- <p>
- Own Id: OTP-14518</p>
- </item>
- <item>
- <p>Modules that use floating point constants compiled
- with R15 or earlier will need to be re-compiled before
- they can be loaded.</p>
- <p>
- Own Id: OTP-14575</p>
- </item>
- <item>
- <p>
- Implementation of true asynchronous signaling between
- processes in order to improve scalability. Signals
- affected include exit, monitor, demonitor, monitor
- triggered, link, unlink, and group leader.</p>
- <p>
- Own Id: OTP-14589</p>
- </item>
- <item>
- <p>
- Added a PGO (profile guided optimization) pass to the
- build step of erts. This can be disabled by passing
- --disable-pgo to configure.</p>
- <p>
- Own Id: OTP-14604</p>
- </item>
- <item>
- <p>
- Improved the performance of <c>binary:split</c> and
- <c>binary:match</c>.</p>
- <p>
- Own Id: OTP-14610 Aux Id: PR-1480 </p>
- </item>
- <item>
- <p>
- It is not longer possible to disable dirty schedulers
- when building erlang.</p>
- <p>
- Own Id: OTP-14613</p>
- </item>
- <item>
- <p>Loaded BEAM code in a 64-bit system requires less
- memory because of better packing of operands for
- instructions.</p>
- <p>These memory savings were achieved by major
- improvements to the <c>beam_makeops</c> scripts used when
- building the run time system and BEAM compiler. There is
- also new for documentation for <c>beam_makeops</c> that
- describes how new BEAM instructions and loader
- transformations can be implemented. The documentation is
- found in here in a source directory or git repository:
- erts/emulator/internal_doc/beam_makeops.md. An online
- version can be found here:
- https://github.com/erlang/otp/blob/master/erts/emulator/internal_doc/beam_makeops.md</p>
- <p>
- Own Id: OTP-14626</p>
- </item>
- <item>
- <p><c>file:read_file</c> has been changed to read the
- content of files that report a size of 0 even when data
- can be read from them. An example of such a file is
- <c>/proc/cpuinfo</c> on Linux.</p>
- <p>
- Own Id: OTP-14637 Aux Id: ERL-327 PR-1524 </p>
- </item>
- <item>
- <p>
- It is no longer possible to disable the <c>temp_alloc</c>
- allocator. Disabling it caused serious performance
- degradations and was never what was wanted.</p>
- <p>
- Own Id: OTP-14651</p>
- </item>
- <item>
- <p>The reduction cost of sending messages is now
- constant. It will no longer scale according to the length
- of the receiving process' message queue.</p>
- <p>
- Own Id: OTP-14667</p>
- </item>
- <item>
- <p>
- Improved loading of modules with <c>-on_load</c>
- directive, to no longer block all schedulers when the
- load operation is completed.</p>
- <p>
- Own Id: OTP-14680</p>
- </item>
- <item>
- <p>
- On platforms with real-time signals available, SIGRTMIN+1
- is now used as the internal scheduler suspend signal
- instead of SIGUSR2.</p>
- <p>
- Own Id: OTP-14682</p>
- </item>
- <item>
- <p>When the value returned from a '<c>catch</c>'
- expression is ignored, no stacktrace will be built if an
- exception is caught. That will save time and produce less
- garbage. There are also some minor optimizations of
- '<c>try</c>/<c>catch</c>' both in the compiler and
- run-time system.</p>
- <p>
- Own Id: OTP-14683</p>
- </item>
- <item>
- <p>The guarantees and non-guarantees of
- <c>erlang:get_stacktrace/0</c> are now documented.</p>
- <p>
- Own Id: OTP-14687</p>
- </item>
- <item>
- <p>There is a new syntax in '<c>try/catch</c>' for
- retrieving the stacktrace without calling
- '<c>erlang:get_stacktrace/0</c>'. See the reference
- manual for a description of the new syntax. The
- '<c>erlang:get_stacktrace/0</c>' BIF is now
- deprecated.</p>
- <p>
- Own Id: OTP-14692</p>
- </item>
- <item>
- <p>
- New 'used' option for <c>binary_to_term/2</c> that will
- also return number of bytes actually read from the
- binary. This enables easy access to any extra data in the
- binary located directly after the returned term.</p>
- <p>
- Own Id: OTP-14780</p>
- </item>
- <item>
- <p>
- Added more statistics for
- <c>erlang:system_info({allocator,A})</c> in the
- <c>mbcs_pool</c> section.</p>
- <p>
- Own Id: OTP-14795 Aux Id: ERL-88 </p>
- </item>
- <item>
- <p>Added <c>enif_ioq_peek_head</c> to retrieve Erlang
- terms from NIF IO queues without having to resort to
- copying.</p>
- <p>
- Own Id: OTP-14797</p>
- </item>
- <item>
- <p>There is a new option '<c>makedep_side_effect</c>' for
- the compiler and <c>-MMD</c> for '<c>erlc</c>' that
- generates dependencies and continues to compile as
- normal.</p>
- <p>
- Own Id: OTP-14830</p>
- </item>
- <item>
- <p>Added <c>ets:whereis/1</c> for retrieving the table
- identifier of a named table.</p>
- <p>
- Own Id: OTP-14884</p>
- </item>
- <item>
- <p><c>seq_trace</c> labels may now be any erlang
- term.</p>
- <p>
- Own Id: OTP-14899</p>
- </item>
- <item>
- <p>
- Optimized the common case of <c>monitor</c> followed by
- <c>send</c> to the same local process. The monitor signal
- is now delayed in order to be piggybacked with the sent
- message and thereby only get one lock operation on the
- message queue of the receiver. A delayed monitor signal
- is flushed if no <c>send</c> has been done at the latest
- when the process is scheduled out.</p>
- <p>
- Own Id: OTP-14901</p>
- </item>
- <item>
- <p>
- Make hipe compiled code work on x86_64 (amd64) with OS
- security feature PIE, where executable code can be loaded
- into a random location. Old behavior, if hipe was
- enabled, was to disable PIE build options for the VM.</p>
- <p>
- Own Id: OTP-14903</p>
- </item>
- <item>
- <p>The number of driver async threads will now default to
- 1 as the standard drivers do not use them anymore. Users
- that changed this value to tweak the file driver should
- replace <c>+A</c> with <c>+SDio</c> since it now uses
- dirty IO schedulers instead of async threads.</p>
- <p>
- *** POTENTIAL INCOMPATIBILITY ***</p>
- <p>
- Own Id: OTP-14928</p>
- </item>
- <item>
- <p>
- Optimize <c>==</c> and <c>/=</c> for binaries with
- different sizes to be constant in time instead of
- proportional to the size of their common prefix.</p>
- <p>
- Own Id: OTP-14934 Aux Id: PR-1708 </p>
- </item>
- <item>
- <p>
- Refactorings making some internal process flags available
- for other usage.</p>
- <p>
- Own Id: OTP-14948</p>
- </item>
- <item>
- <p>
- Removed need for HiPE to allocate native executable
- memory in low 2GB address space on x86_64. Command line
- option <c>+MXscs</c> is thereby obsolete and ignored.</p>
- <p>
- Own Id: OTP-14951</p>
- </item>
- <item>
- <p>Added <c>enif_make_map_from_arrays</c> for creating a
- populated map, analogous to
- <c>enif_make_list_from_array</c>.</p>
- <p>
- Own Id: OTP-14954</p>
- </item>
- <item>
- <p>Added configuration switches for busy-wait and wake up
- thresholds for dirty schedulers, and changing these
- settings for normal schedulers will no longer affect
- dirty schedulers. </p> <p>Refer to the documentation for
- details. The new switches are <seealso
- marker="erl#+sbwtdcpu">+sbwtdcpu</seealso>, <seealso
- marker="erl#+sbwtdio">+sbwtdio</seealso>, <seealso
- marker="erl#+swtdcpu">+swtdcpu</seealso>, and <seealso
- marker="erl#+swtdio">+swtdio</seealso>.</p> <p>The
- default busy wait threshold for dirty scheduler threads
- has also been lowered to <c>short</c>.</p>
- <p>
- Own Id: OTP-14959</p>
- </item>
- <item>
- <p>
- The list of "taints" now also includes dynamic loaded
- drivers in addition to NIF libraries. Statically linked
- drivers and NIF libraries that are part of erts are not
- included. The "taints" are returned by
- <c>system_info(taints)</c> and printed in the header of
- <c>erl_crash.dump</c> files.</p>
- <p>
- Own Id: OTP-14960</p>
- </item>
- <item>
- <p>Added <c>instrument:allocations</c> and
- <c>instrument:carriers</c> for retrieving information
- about memory utilization and fragmentation.</p>
- <p>The old <c>instrument</c> interface has been removed,
- as have the related options <c>+Mim</c> and
- <c>+Mis</c>.</p>
- <p>
- *** POTENTIAL INCOMPATIBILITY ***</p>
- <p>
- Own Id: OTP-14961</p>
- </item>
- <item>
- <p>The process suspend functionality used by the <seealso
- marker="erlang#suspend_process/2">erlang:suspend_process/2</seealso>
- BIF has been reimplemented using the newly introduced
- true asynchronous signaling between processes. This
- mainly to reduce memory usage in the process control
- block of all processes, but also in order to simplify the
- implementation.</p> <warning> <p>You can easily create
- deadlocks if processes suspends each other (directly or
- in circles). In ERTS versions prior to ERTS version 10.0,
- the runtime system prevented such deadlocks, but this
- prevention has now been removed due to performance
- reasons.</p> </warning> <p>Other ERTS internal
- functionality that used the previous process suspend
- functionality have also been reimplemented to use
- asynchronous signaling instead.</p>
- <p>
- *** POTENTIAL INCOMPATIBILITY ***</p>
- <p>
- Own Id: OTP-14964 Aux Id: OTP-14589 </p>
- </item>
- <item>
- <p>Added the <c>nifs</c> option to
- <c>?MODULE:module_info/1</c> for listing a module's
- installed NIF functions.</p>
- <p>
- Own Id: OTP-14965</p>
- </item>
- <item>
- <p>
- New implementation of <c>erlang:process_info/[1,2]</c>.</p>
- <p>
- In the general case when inspecting another process, the
- new implementation sends an asynchronous process-info
- request signal to the other process and waits for the
- result instead of locking the other process and reading
- the result directly. In some special cases where no
- conflicts occur, signal order wont be violated, and the
- amount of data requested is guaranteed to be small, the
- inspected process may be inspected directly.</p>
- <p>
- Appropriate amount of reductions are now also bumped when
- inspecting a process.</p>
- <p>
- Own Id: OTP-14966</p>
- </item>
- <item>
- <p>
- Removed process start time from crash dump in order to
- save memory in process control block.</p>
- <p>
- Own Id: OTP-14975 Aux Id: PR-1597 </p>
- </item>
- <item>
- <p>
- Optimize <c>erlang:put/2</c> when updating existing key
- with a new immediate value (atom, small integer, pid,
- port).</p>
- <p>
- Own Id: OTP-14976</p>
- </item>
- <item>
- <p>
- <c>erlang:process_info/1</c> has been changed to no
- longer include <c>messages</c> by default. Instead
- <c>erlang:process_info/2</c> should be used.</p>
- <p>
- *** POTENTIAL INCOMPATIBILITY ***</p>
- <p>
- Own Id: OTP-14986 Aux Id: PR-1745 </p>
- </item>
- <item>
- <p>
- New <c>erlang:system_info(ets_count)</c> to get total
- number of ets tables existing at the local node.</p>
- <p>
- Own Id: OTP-14987</p>
- </item>
- <item>
- <p>
- New NIF functions: <c>enif_mutex_name</c>,
- <c>enif_cond_name</c>, <c>enif_rwlock_name</c>,
- <c>enif_thread_name</c>, <c>enif_vfprintf</c>,
- <c>enif_vsnprintf</c>.</p>
- <p>
- Own Id: OTP-14994</p>
- </item>
- <item>
- <p>When <c>erlang:system_flag(backtrace_depth, 0)</c> has
- been called, all exceptions will now contain the entry
- for <em>one</em> function (despite the zero). It used to
- be that a hand-made stack backtrace passed to
- <c>erlang:raise/3</c> would be be truncated to an empty
- list.</p>
- <p>
- Own Id: OTP-15026</p>
- </item>
- <item>
- <p>
- Fixed bug for named <c>ets</c> tables which could cause
- unexpected results from matchspec iteration functions
- (<c>ets:select*</c> and <c>ets:match*</c>) if the table
- was deleted and recreated with the same name during the
- iteration. The iteration could incorrectly continue
- through the recreated table. The expected correct
- behavior is now for the iteration call to fail with a
- <c>badarg</c> exception if the table is deleted before
- the iteration has completed.</p>
- <p>
- Own Id: OTP-15031</p>
- </item>
- <item>
- <p>Two new guards BIFs operating on maps have been added:
- <c>map_get/2</c> and <c>is_map_key/2</c>. They do the
- same as <c>maps:get/2</c> and <c>maps:is_key/2</c>,
- respectively, except that they are allowed to be used in
- guards.</p>
- <p>
- Own Id: OTP-15037 Aux Id: PR-1784, PR-1802 </p>
- </item>
- <item>
- <p>
- Release run-queue lock while cleaning up terminated dirty
- process.</p>
- <p>
- Own Id: OTP-15081</p>
- </item>
- <item>
- <p>The callback module passed as <c>-epmd_module</c> to
- erl has been expanded to be able to do name and port
- resolving.</p> <p>Documentation has also been added in
- the <seealso
- marker="kernel:erl_epmd"><c>erl_epmd</c></seealso>
- reference manual and ERTS User's Guide <seealso
- marker="erts:alt_disco">How to Implement an Alternative
- Service Discovery for Erlang Distribution</seealso>.</p>
- <p>
- Own Id: OTP-15086 Aux Id: PR-1694 </p>
- </item>
- </list>
- </section>
-
-</section>
-
<section><title>Erts 9.3.3.9</title>
<section><title>Improvements and New Features</title>