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Diffstat (limited to 'erts/doc/src/notes.xml')
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1 files changed, 18 insertions, 2009 deletions
diff --git a/erts/doc/src/notes.xml b/erts/doc/src/notes.xml index 8336c1e3d6..cc44b2f4cc 100644 --- a/erts/doc/src/notes.xml +++ b/erts/doc/src/notes.xml @@ -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<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> |