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authorSverker Eriksson <[email protected]>2017-08-30 20:55:08 +0200
committerSverker Eriksson <[email protected]>2017-08-30 20:55:08 +0200
commit7c67bbddb53c364086f66260701bc54a61c9659c (patch)
tree92ab0d4b91d5e2f6e7a3f9d61ea25089e8a71fe0 /erts/doc/src/notes.xml
parent97dc5e7f396129222419811c173edc7fa767b0f8 (diff)
parent3b7a6ffddc819bf305353a593904cea9e932e7dc (diff)
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Merge tag 'OTP-19.0' into sverker/19/binary_to_atom-utf8-crash/ERL-474/OTP-14590
Diffstat (limited to 'erts/doc/src/notes.xml')
-rw-r--r--erts/doc/src/notes.xml4232
1 files changed, 4199 insertions, 33 deletions
diff --git a/erts/doc/src/notes.xml b/erts/doc/src/notes.xml
index f94d71ee3d..3c3129d543 100644
--- a/erts/doc/src/notes.xml
+++ b/erts/doc/src/notes.xml
@@ -1,23 +1,24 @@
-<?xml version="1.0" encoding="latin1" ?>
+<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE chapter SYSTEM "chapter.dtd">
<chapter>
<header>
<copyright>
- <year>2004</year><year>2013</year>
+ <year>2004</year><year>2016</year>
<holder>Ericsson AB. All Rights Reserved.</holder>
</copyright>
<legalnotice>
- The contents of this file are subject to the Erlang Public License,
- Version 1.1, (the "License"); you may not use this file except in
- compliance with the License. You should have received a copy of the
- Erlang Public License along with this software. If not, it can be
- retrieved online at http://www.erlang.org/.
-
- Software distributed under the License is distributed on an "AS IS"
- basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
- the License for the specific language governing rights and limitations
- under the License.
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
</legalnotice>
@@ -30,6 +31,4171 @@
</header>
<p>This document describes the changes made to the ERTS application.</p>
+
+<section><title>Erts 8.0</title>
+
+ <section><title>Fixed Bugs and Malfunctions</title>
+ <list>
+ <item>
+ <p>The handling of <c>on_load</c> functions has been
+ improved. The major improvement is that if a code upgrade
+ fails because the <c>on_load</c> function fails, the
+ previous version of the module will now be retained.</p>
+ <p>
+ Own Id: OTP-12593</p>
+ </item>
+ <item>
+ <p><c>is_builtin(erlang, apply, 3)</c> will now return
+ <c>true</c>.</p>
+ <p>
+ Own Id: OTP-13034</p>
+ </item>
+ <item>
+ <p>
+ Fix <c>enif_get_list_length</c> to return false if list
+ is improper or have length larger than <c>UINT_MAX</c>
+ (did return true and an incorrect length value).</p>
+ <p>
+ Own Id: OTP-13288 Aux Id: PR913 </p>
+ </item>
+ <item>
+ <p>
+ Cleanup hipe signal handling code for x86 and make it
+ more portable.</p>
+ <p>
+ Own Id: OTP-13341 Aux Id: PR951 </p>
+ </item>
+ <item>
+ <p>
+ Make file:datasync use fsync instead of fdatasync on Mac
+ OSX.</p>
+ <p>
+ Own Id: OTP-13411</p>
+ </item>
+ <item>
+ <p>
+ Make sure to create a crash dump when running out of
+ memory. This was accidentally removed in the erts-7.3
+ release.</p>
+ <p>
+ Own Id: OTP-13419</p>
+ </item>
+ <item>
+ <p>
+ A bug has been fixed where if erlang was started +B on a
+ unix platform it would be killed by a SIGUSR2 signal when
+ creating a crash dump.</p>
+ <p>
+ Own Id: OTP-13425</p>
+ </item>
+ <item>
+ <p>
+ Fix race between <c>process_flag(trap_exit,true)</c> and
+ a received exit signal.</p>
+ <p>
+ A process could terminate due to exit signal even though
+ <c>process_flag(trap_exit,true)</c> had returned. A very
+ specific timing between call to <c>process_flag/2</c> and
+ exit signal from another scheduler was required for this
+ to happen.</p>
+ <p>
+ Own Id: OTP-13452</p>
+ </item>
+ <item>
+ <p>Don't search for non-existing Map keys twice</p>
+ <p>For <c>maps:get/2,3</c> and <c>maps:find/2</c>,
+ searching for an immediate key, e.g. an atom, in a small
+ map, the search was performed twice if the key did not
+ exist.</p>
+ <p>
+ Own Id: OTP-13459</p>
+ </item>
+ <item>
+ <p>
+ When an abnormally large distribution message is about to
+ be sent, the VM has been changed to create a crash dump
+ instead of a core dump.</p>
+ <p>
+ Own Id: OTP-13474</p>
+ </item>
+ <item>
+ <p>
+ Fix <c>erlang:process_info/2</c> type specification</p>
+ <p>
+ Own Id: OTP-13485 Aux Id: ERL-123 </p>
+ </item>
+ <item>
+ <p>
+ Fix bug in <c>open_port/2</c> with option <c>{args,
+ List}</c>. A vm crash could be caused by an improper
+ <c>List</c>.</p>
+ <p>
+ Own Id: OTP-13489 Aux Id: ERL-127 </p>
+ </item>
+ <item>
+ <p>
+ Fixed a race-condition bug where the emulator could crash
+ when <c>erlang:system_profile/1,2</c> was enabled and a
+ process had to be re-scheduled during termination.</p>
+ <p>
+ Own Id: OTP-13494 Aux Id: ERL-126 </p>
+ </item>
+ <item>
+ <p>
+ Fixed bugs where the reduction counter was not handled
+ correct.</p>
+ <p>
+ Own Id: OTP-13512</p>
+ </item>
+ <item>
+ <p>
+ Fixed typo in description of the <c>EPMD_DUMP_REQ</c>
+ response.</p>
+ <p>
+ Own Id: OTP-13517</p>
+ </item>
+ <item>
+ <p>
+ Fixed a bug where a process flagged as sensitive would
+ sometimes record its save_calls when it shouldn't.</p>
+ <p>
+ Own Id: OTP-13540</p>
+ </item>
+ <item>
+ <p>
+ Update configure scripts to not use hard-coded path for
+ /bin/pwd and /bin/rm.</p>
+ <p>
+ Own Id: OTP-13562</p>
+ </item>
+ <item>
+ <p>
+ When passing a larger binary than the outputv callback of
+ a linked-in driver can handle in one io vector slot, the
+ binary is now split into multiple slots in the io vector.
+ This change only effects system where the max size of an
+ io vector slot is smaller then the word size of the
+ system (e.g. Windows).</p>
+ <p>
+ This change means that it is now possible on Windows to
+ send binaries that are larger than 4GB to port_command,
+ which is what is used for file:write, gen_tcp:send etc.</p>
+ <p>
+ Own Id: OTP-13628</p>
+ </item>
+ <item>
+ <p>
+ Workaround of Maps output in crashdumps. Currently the
+ atom 'undefined' is generated instead of Map data if a
+ Map type is encountered during crash.</p>
+ <p>
+ Own Id: OTP-13657</p>
+ </item>
+ </list>
+ </section>
+
+
+ <section><title>Improvements and New Features</title>
+ <list>
+ <item>
+ <p>
+ The tracing support has been extended to allow a <seealso
+ marker="erl_tracer">tracer module</seealso> to be the
+ trace event handler instead of a process or port. The
+ <seealso marker="erl_tracer">tracer module</seealso>
+ makes it possible for trace tools to filter or manipulate
+ trace event data without the trace event first having to
+ be copied from the traced process or port.</p>
+ <p>
+ With the introduction of this feature,
+ <c>erlang:trace(all|existing, _, _)</c> now also returns
+ the tracer process as part of the number of processes on
+ which tracing is enabled. The is incompatible with the
+ previous releases.</p>
+ <p>
+ *** POTENTIAL INCOMPATIBILITY ***</p>
+ <p>
+ Own Id: OTP-10267</p>
+ </item>
+ <item>
+ <p>
+ Introduce LTTng tracing of Erlang Runtime System</p>
+ <p>
+ For LTTng to be enabled OTP needs to be built with
+ configure option <c>--with-dynamic-trace=lttng</c>.</p>
+ <p>
+ This feature introduces tracepoints for schedulers,
+ drivers, memory carriers, memory and async thread pool.</p>
+ <p> For a list of all tracepoints, see <seealso
+ marker="runtime_tools:LTTng">Runtime Tools User's
+ Guide</seealso> .</p>
+ <p>
+ Own Id: OTP-10282</p>
+ </item>
+ <item>
+ <p>
+ Make it possible to monitor/demonitor ports using the
+ <seealso
+ marker="erlang#monitor/2">erlang:monitor/2</seealso> API.
+ The process and port information functions have also been
+ updated to include information about monitors from
+ processes to ports.</p>
+ <p>
+ Own Id: OTP-11384</p>
+ </item>
+ <item>
+ <p>
+ Add microstate accounting</p>
+ <p>
+ Microstate accounting is a way to track which state the
+ different threads within ERTS are in. The main usage area
+ is to pin point performance bottlenecks by checking which
+ states the threads are in and then from there figuring
+ out why and where to optimize.</p>
+ <p>
+ Since checking whether microstate accounting is on or off
+ is relatively expensive only a few of the states are
+ enabled by default and more states can be enabled through
+ configure.</p>
+ <p>
+ There is a convenience module called msacc that has been
+ added to runtime_tools that can assist in gathering and
+ interpreting the data from Microstate accounting.</p>
+ <p>
+ For more information see <seealso
+ marker="erts:erlang#statistics_microstate_accounting">erlang:statistics(microstate_accounting,
+ _)</seealso> and the <seealso
+ marker="runtime_tools:msacc">msacc</seealso> module in
+ runtime_tools.</p>
+ <p>
+ Own Id: OTP-12345</p>
+ </item>
+ <item>
+ <p>
+ The port of Erlang/OTP to the real-time operating system
+ OSE has been removed.</p>
+ <p>
+ Own Id: OTP-12573</p>
+ </item>
+ <item>
+ <p>
+ Sharing preserved copy for messages and exit signals</p>
+ <p>
+ Enable sharing preserved copy with configure option
+ <c>--enable-sharing-preserving</c>. This will preserve
+ sharing, within the process, when communication with
+ other processes in the Erlang node. There is a trade-off,
+ the copy is more costly but this cost can be reclaimed if
+ there is a lot of sharing in the message. In addition
+ literals will not be copied in a send except during a
+ purge phase of the module where the literals are located.
+ This feature is considered experimental in 19.0.</p>
+ <p>
+ Own Id: OTP-12590 Aux Id: OTP-10251 </p>
+ </item>
+ <item>
+ <p>
+ Halfword BEAM has been removed.</p>
+ <p>
+ Own Id: OTP-12883</p>
+ </item>
+ <item>
+ <p>
+ Added <seealso
+ marker="kernel:os#perf_counter/1">os:perf_counter/1</seealso>.</p>
+ <p>
+ The perf_counter is a very very cheap and high resolution
+ timer that can be used to timestamp system events. It
+ does not have monoticity guarantees, but should on most
+ OS's expose a monotonous time.</p>
+ <p>
+ Own Id: OTP-12908</p>
+ </item>
+ <item>
+ <p>
+ Support for a fragmented young heap generation. That is,
+ the young heap generation can consist of multiple non
+ continuous memory areas. The main reason for this change
+ is to avoid extra copying of messages that could not be
+ allocated directly on the receivers heap.</p>
+ <p>
+ Own Id: OTP-13047</p>
+ </item>
+ <item>
+ <p>
+ Erlang linked-in driver can now force the call to
+ open_port to block until a call to erl_drv_init_ack is
+ made inside the driver. This is useful when you want to
+ do some asynchronous initialization, for example getting
+ configuration from a pipe, and you want the initial
+ open_port call to fail if the configuration is incomplete
+ or wrong. See the erl_driver documentation for more
+ details on the API.</p>
+ <p>
+ Own Id: OTP-13086</p>
+ </item>
+ <item>
+ <p>
+ Erlang linked-in drivers can now set their own pids as
+ seen in <c>erlang:port_info/1</c> by using the
+ <c>erl_drv_set_pid</c> function. For more details see the
+ erl_driver documentation.</p>
+ <p>
+ Own Id: OTP-13087</p>
+ </item>
+ <item>
+ <p>
+ The functionality behind <c>erlang:open_port/2</c> when
+ called with spawn or spawn_executable has been redone so
+ that the forking of the new program is done in a separate
+ process called erl_child_setup. This allows for a much
+ more robust implementation that uses less memory and does
+ not block the entire emulator if the program to be
+ started is on an un-accessible NFS. Benchmarks have shown
+ this approach to be about 3-5 times as fast as the old
+ approach where the fork/vfork was done by erts. This is a
+ pure stability and performance fix, however some error
+ messages may have changed, which is why it is marked as a
+ backwards incompatible change.</p>
+ <p>
+ *** POTENTIAL INCOMPATIBILITY ***</p>
+ <p>
+ Own Id: OTP-13088</p>
+ </item>
+ <item>
+ <p>Improved yielding strategy in the implementation of
+ the following native functions:</p> <list>
+ <item><c>erlang:binary_to_list/1</c></item>
+ <item><c>erlang:binary_to_list/3</c></item>
+ <item><c>erlang:bitstring_to_list/1</c></item>
+ <item><c>erlang:list_to_binary/1</c></item>
+ <item><c>erlang:iolist_to_binary/1</c></item>
+ <item><c>erlang:list_to_bitstring/1</c></item>
+ <item><c>binary:list_to_bin/1</c></item> </list> <p>This
+ in order to improve performance of these functions.</p>
+ <p>
+ Own Id: OTP-13096</p>
+ </item>
+ <item>
+ <p>
+ All garbage collections of processes now bump reductions.
+ Also the amount of reductions bumped when garbage
+ collecting has been adjusted. It now better corresponds
+ to the amount of work performed. This in order to improve
+ the real time characteristics of the system.</p>
+ <p>
+ Own Id: OTP-13097</p>
+ </item>
+ <item>
+ <p>New functions that can load multiple modules at once
+ have been added to the '<c>code</c>' module. The
+ functions are <c>code:atomic_load/1</c>,
+ <c>code:prepare_loading/1</c>,
+ <c>code:finish_loading/1</c>, and
+ <c>code:ensure_modules_loaded/1</c>.</p>
+ <p>
+ Own Id: OTP-13111</p>
+ </item>
+ <item>
+ <p>The <c>-boot_var</c> option for <c>erl</c> now only
+ supports a single key and single value (as documented).
+ The option used to allow multiple key/value pairs, but
+ that behavior was undocumented.</p>
+ <p>The function <c>erl_prim_loader:start/3</c> has been
+ removed. Its documentation has also been removed.</p>
+ <p>The undocumented and unsupported function
+ <c>erl_prim_loader:get_files/2</c> has been removed.</p>
+ <p>
+ Own Id: OTP-13112</p>
+ </item>
+ <item>
+ <p>
+ Low level BIF <c>erlang:purge_module/1</c> is made more
+ robust against incorrect use. Lingering processes that
+ still refer the old code are now killed before the module
+ is purged to prevent fatal VM behavior.</p>
+ <p>
+ Own Id: OTP-13122</p>
+ </item>
+ <item>
+ <p>Improved dirty scheduler implementation. For more
+ information see the <seealso
+ marker="erl_nif#dirty_nifs">NIF
+ documentation</seealso>.</p> <note><list> <item><p>The
+ dirty scheduler support is still
+ <em>experimental</em>.</p></item> <item><p>The support
+ for determining whether dirty NIF support exist or not at
+ compile time using the C preprocessor macro
+ <c>ERL_NIF_DIRTY_SCHEDULER_SUPPORT</c> has been
+ removed.</p></item> <item><p>The
+ <c>enif_is_on_dirty_scheduler()</c> function has been
+ removed. Use <seealso
+ marker="erl_nif#enif_thread_type"><c>enif_thread_type()</c></seealso>
+ instead.</p></item> </list></note>
+ <p>
+ Own Id: OTP-13123</p>
+ </item>
+ <item>
+ <p>
+ Various optimizations done to process dictionary access.</p>
+ <p>
+ Own Id: OTP-13167</p>
+ </item>
+ <item>
+ <p>
+ Added max_heap_size process flag. max_heap_size allows
+ the user to limit the maximum heap used by a process. See
+ <seealso
+ marker="erlang#process_flag/2">erlang:process_flag</seealso>
+ for more details.</p>
+ <p>
+ Own Id: OTP-13174</p>
+ </item>
+ <item>
+ <p>
+ Allow dynamic drivers and NIF libraries to be built with
+ gcc option <c>-fvisibility=hidden</c> for faster loading
+ and more optimized code.</p>
+ <p>
+ Own Id: OTP-13227</p>
+ </item>
+ <item>
+ <p>
+ Add <c>erlang:process_info(Pid,
+ garbage_collection_info)</c> which returns extended
+ garbage_collection information. For more details see the
+ documentation.</p>
+ <p>
+ Own Id: OTP-13265</p>
+ </item>
+ <item>
+ <p>
+ The functions <c>erlang:list_to_integer/1</c> and
+ <c>string:to_integer/1</c> have been optimized for large
+ inputs.</p>
+ <p>
+ Own Id: OTP-13293</p>
+ </item>
+ <item>
+ <p>
+ Improved memory allocation strategy for hipe native code
+ on x86_64 (amd64) architectures by reserving enough low
+ virtual address space needed for the HiPE/AMD64 small
+ code model. The default virtual address area for hipe
+ code is set to 512Mb, but can be changed with emulator
+ flag <c>+MXscs</c>.</p>
+ <p>
+ Own Id: OTP-13359</p>
+ </item>
+ <item>
+ <p>
+ Introduction of configurable management of data referred
+ to by the message queue of a process. Each process can be
+ configured individually.</p>
+ <p>
+ It is now possible to configure the message queue of a
+ process, so that all data referred by it will be kept
+ outside of the heap, and by this prevent this data from
+ being part of garbage collections.</p>
+ <p>
+ For more information see the documentation of <seealso
+ marker="erlang#process_flag_message_queue_data"><c>process_flag(message_queue_data,
+ MQD)</c></seealso>.</p>
+ <p>
+ Own Id: OTP-13366 Aux Id: OTP-13047 </p>
+ </item>
+ <item>
+ <p>
+ Processes now yield when scanning large message queues
+ and not finding a matching message. This in order to
+ improve real time characteristics.</p>
+ <p>
+ Own Id: OTP-13401</p>
+ </item>
+ <item>
+ <p>
+ Optimized an erts internal function that is used to
+ traverse erlang terms. The internal function was mainly
+ used by term_to_binary and comparison of terms.
+ Benchmarks have shown up to a 10% performance increase in
+ those functions after the optimization.</p>
+ <p>
+ Own Id: OTP-13440</p>
+ </item>
+ <item>
+ <p>
+ Add the following NIF API functions:</p>
+ <p>
+ <list> <item><seealso
+ marker="erl_nif#enif_cpu_time"><c>enif_cpu_time</c></seealso></item>
+ <item><seealso
+ marker="erl_nif#enif_now_time"><c>enif_now_time</c></seealso></item>
+ <item><seealso
+ marker="erl_nif#enif_make_unique_integer"><c>enif_make_unique_integer</c></seealso></item>
+ <item><seealso
+ marker="erl_nif#enif_is_process_alive"><c>enif_is_process_alive</c></seealso></item>
+ <item><seealso
+ marker="erl_nif#enif_is_port_alive"><c>enif_is_port_alive</c></seealso></item>
+ <item><seealso
+ marker="erl_nif#enif_term_to_binary"><c>enif_term_to_binary</c></seealso></item>
+ <item><seealso
+ marker="erl_nif#enif_binary_to_term"><c>enif_binary_to_term</c></seealso></item>
+ <item><seealso
+ marker="erl_nif#enif_port_command"><c>enif_port_command</c></seealso></item>
+ </list></p>
+ <p>
+ for details of what each function does, see the erl_nif
+ documentation.</p>
+ <p>
+ Own Id: OTP-13442</p>
+ </item>
+ <item>
+ <p>
+ Optimize <c>'++'</c> operator and <c>lists:append/2</c>
+ by using a single pass to build a new list while checking
+ for properness.</p>
+ <p>
+ Own Id: OTP-13487</p>
+ </item>
+ <item>
+ <p>
+ Handle terms (pids,ports and refs) from nodes with a
+ 'creation' value larger than 3. This is a preparation of
+ the distribution protocol to allow OTP 19 nodes to
+ correctly communicate with future nodes (20 or higher).
+ The 'creation' value differentiates different
+ incarnations of the same node (name).</p>
+ <p>
+ Own Id: OTP-13488</p>
+ </item>
+ <item>
+ <p>
+ Don't send unasked for systemd notifications in epmd</p>
+ <p>
+ Own Id: OTP-13493 Aux Id: PR-999 </p>
+ </item>
+ <item>
+ <p>
+ The enif_send API has been extended to allow NULL to be
+ used as the message environment. When used this way, a
+ message environment is implicitly created and the given
+ term is copied into that environment before sending. This
+ can be an optimization if many small messages are being
+ sent by the nif.</p>
+ <p>
+ Own Id: OTP-13495</p>
+ </item>
+ <item>
+ <p>
+ The tracing support has been extended to allow tracing on
+ ports. Ports can be traced on using the 'ports', 'send'
+ and 'receive' trace flags.</p>
+ <p>
+ The first argument of <seealso
+ marker="erts:erlang#trace/3">erlang:trace/3</seealso> has
+ been extended so that <c>'all'</c>, <c>'existing'</c> and
+ <c>'new'</c> now include both processes and ports. New
+ <c>Tracee</c> variants, <c>'all_processes'</c>,
+ <c>'all_ports'</c>, <c>'existing_processes'</c> etc have
+ been added to specify only processes or ports.</p>
+ <p>
+ *** POTENTIAL INCOMPATIBILITY ***</p>
+ <p>
+ Own Id: OTP-13496</p>
+ </item>
+ <item>
+ <p>
+ When the <c>'procs'</c> trace flag is enabled, a
+ <c>'spawned'</c> trace event is now also generated by a
+ newly created process. The previous event <c>'spawn'</c>
+ remains, but as it is generated by the process that did
+ the spawn, it is not guaranteed that it is ordered with
+ other trace events from the newly spawned process. So
+ when tracking the lifetime of a process this new event
+ should be used as the creation event.</p>
+ <p>
+ This new trace event is marked as an incompatibility
+ because tools that expect certain trace events when
+ enabling 'procs' will have to updated.</p>
+ <p>
+ *** POTENTIAL INCOMPATIBILITY ***</p>
+ <p>
+ Own Id: OTP-13497</p>
+ </item>
+ <item>
+ <p>
+ Add the <seealso
+ marker="erts:erlang#match_spec_test/3">erlang:match_spec_test/3</seealso>
+ function. The functions allows the testing of match
+ specifications for both tracing and ets tables. It can be
+ used to test that a match specification does the expected
+ filtering on specific data. It also returns more verbose
+ error reasons for incorrectly constructed match
+ specifications.</p>
+ <p>
+ Own Id: OTP-13501</p>
+ </item>
+ <item>
+ <p>
+ The erts internal tracing support has been changed to
+ have much less overhead and be more scalable.</p>
+ <p>
+ This rewrite does not break any backwards
+ incompatibilities, but it does change the ordering of
+ some trace messages when compared to previous releases.
+ It should be noted that this only applies to trace
+ messages sent to processes or ports, it does not apply to
+ the new tracer module. However in future releases they
+ may also be effected by this.</p>
+ <p>
+ Trace messages are only guaranteed to be ordered from one
+ traced process or port. In previous releases this was not
+ visible as a <c>'send'</c> trace message would always
+ arrive before the corresponding <c>'receive'</c> trace
+ message that is no longer always the case. This also
+ means that timestamped trace messages may seem to arrive
+ out of order as the timestamp is taken when the event is
+ triggered and not when it is put in the queue of the
+ tracer.</p>
+ <p>
+ Own Id: OTP-13503</p>
+ </item>
+ <item>
+ <p>
+ Add possibility to filter <c>send</c> and <c>receive</c>
+ trace with match specifications.</p>
+ <p>
+ Own Id: OTP-13507</p>
+ </item>
+ <item>
+ <p>
+ Add <c>maps:update_with/3,4</c> and <c>maps:take/2</c></p>
+ <p>
+ Own Id: OTP-13522 Aux Id: PR-1025 </p>
+ </item>
+ <item>
+ <p>
+ Introduce LTTng tracing via Erlang tracing.</p>
+ <p>
+ For LTTng to be enabled OTP needs to be built with
+ configure option <c>--with-dynamic-trace=lttng</c>.</p>
+ <p>The dynamic trace module <c>dyntrace</c> is now
+ capable to be used as a LTTng sink for Erlang tracing.
+ For a list of all tracepoints, see <seealso
+ marker="runtime_tools:LTTng">Runtime Tools User's
+ Guide</seealso> .</p>
+ <p>This feature also introduces an incompatible change in
+ trace tags. The trace tags <c>gc_start</c> and
+ <c>gc_end</c> has been split into <c>gc_minor_start</c>,
+ <c>gc_minor_end</c> and <c>gc_major_start</c>,
+ <c>gc_major_end</c>.</p>
+ <p>
+ *** POTENTIAL INCOMPATIBILITY ***</p>
+ <p>
+ Own Id: OTP-13532</p>
+ </item>
+ <item>
+ <p>
+ Print heap pointers for garbing processes during
+ crashdump</p>
+ <p>
+ Own Id: OTP-13541 Aux Id: PR-1026 </p>
+ </item>
+ <item>
+ <p>
+ Changed and improved low level memory statistics returned
+ by <c>erlang:system_info/1</c>. The info for
+ <c>erts_mmap</c> has been moved from <c>mseg_alloc</c> to
+ its own section returned by <c>{allocator,
+ erts_mmap}</c>.</p>
+ <p>
+ Own Id: OTP-13560</p>
+ </item>
+ <item>
+ <p>
+ Add enif_snprintf to the NIF API</p>
+ <p>
+ The function <c>enif_snprintf</c> is similar to
+ <c>snprintf</c> call but can handle formatting of Erlang
+ terms via <c>%T</c> format specifier.</p>
+ <p>
+ Own Id: OTP-13580</p>
+ </item>
+ <item>
+ <p>The warning in the documentation for
+ <c>erlang:raise/3</c> has been removed. It is now
+ officially perfectly fine to use raise/3 in production
+ code.</p>
+ <p>
+ Own Id: OTP-13599</p>
+ </item>
+ <item>
+ <p>
+ Fix bugs caused by the VM sometimes truncating object
+ sizes or offsets to 32 bits on 64-bit hosts. These bugs
+ were mainly found when working with large unicode strings
+ and nifs environments.</p>
+ <p>
+ Own Id: OTP-13606</p>
+ </item>
+ <item>
+ <p>
+ Add <c>-start_epmd</c> command line option, this lets you
+ disable automatic starting of epmd when starting a
+ distributed node.</p>
+ <p>
+ Add <c>-epmd_module</c> command line option, this lets
+ you specify a module to register and look-up node names
+ in. The default module is <c>erl_epmd</c>.</p>
+ <p>
+ Own Id: OTP-13627</p>
+ </item>
+ <item>
+ <p>
+ <c>erlang:halt</c> now truncates strings longer than 200
+ characters instead of failing with <c>badarg</c>.</p>
+ <p>
+ Own Id: OTP-13630</p>
+ </item>
+ <item>
+ <p>
+ Fix possible race in poller wake up on windows</p>
+ <p>
+ Own Id: OTP-13634</p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
+<section><title>Erts 7.3.1</title>
+
+ <section><title>Fixed Bugs and Malfunctions</title>
+ <list>
+ <item>
+ <p>
+ <c>process_info(Pid, last_calls)</c> did not work for
+ <c>Pid /= self()</c>.</p>
+ <p>
+ Own Id: OTP-13418</p>
+ </item>
+ <item>
+ <p>
+ Make sure to create a crash dump when running out of
+ memory. This was accidentally removed in the erts-7.3
+ release.</p>
+ <p>
+ Own Id: OTP-13419</p>
+ </item>
+ <item>
+ <p>
+ Schedulers could be woken by a premature timeout on
+ Linux. This premature wakeup was however harmless.</p>
+ <p>
+ Own Id: OTP-13420</p>
+ </item>
+ <item>
+ <p>
+ A process communicating with a port via one of the
+ <c>erlang:port_*</c> BIFs could potentially end up in an
+ inconsistent state if the port terminated during the
+ communication. When this occurred the process could later
+ block in a <c>receive</c> even though it had messages
+ matching in its message queue.</p>
+ <p>
+ This bug was introduced in erts version 5.10 (OTP R16A).</p>
+ <p>
+ Own Id: OTP-13424 Aux Id: OTP-10336 </p>
+ </item>
+ <item>
+ <p>
+ The reference count of a process structure could under
+ rare circumstances be erroneously managed. When this
+ happened invalid memory accesses occurred.</p>
+ <p>
+ Own Id: OTP-13446</p>
+ </item>
+ <item>
+ <p>
+ Fix race between <c>process_flag(trap_exit,true)</c> and
+ a received exit signal.</p>
+ <p>
+ A process could terminate due to exit signal even though
+ <c>process_flag(trap_exit,true)</c> had returned. A very
+ specific timing between call to <c>process_flag/2</c> and
+ exit signal from another scheduler was required for this
+ to happen.</p>
+ <p>
+ Own Id: OTP-13452</p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
+<section><title>Erts 7.3</title>
+
+ <section><title>Fixed Bugs and Malfunctions</title>
+ <list>
+ <item>
+ <p>
+ The '-path' flag to 'erl' has been documented. This flag
+ replaces the path specified in the boot script. It has
+ always existed, but was earlier only documented in SASL
+ (script).</p>
+ <p>
+ Own Id: OTP-13060</p>
+ </item>
+ <item>
+ <p>
+ The <c>call_time</c> tracing functionality internally
+ used a time based on OS system time in order to measure
+ call time which could cause erroneous results if OS
+ system time was changed during tracing.</p>
+ <p>
+ This functionality now use Erlang monotonic time in order
+ to measure time. Besides fixing the erroneous results due
+ to OS system time being used, the results are often also
+ better since Erlang monotonic time often has better
+ accuracy and precision.</p>
+ <p>
+ Own Id: OTP-13216</p>
+ </item>
+ <item>
+ <p>
+ Fix behaviour of -delay_write command line switch of
+ epmd, which is used for debugging - in some cases epmd
+ was sleeping twice the requested amount of time.</p>
+ <p>
+ Own Id: OTP-13220</p>
+ </item>
+ <item>
+ <p>
+ Fix race between timeout and exit signal that could cause
+ a process to ignore the exit signal and continue
+ execution. Bug exist since OTP 18.0.</p>
+ <p>
+ Own Id: OTP-13245</p>
+ </item>
+ <item>
+ <p>
+ Fix bug in <c>erlang:halt/1,2</c> for large exit status
+ values, causing either <c>badarg</c> (on 32-bit) or exit
+ with a crash dump and/or core dump (on 64-bit). Make
+ <c>erlang:halt/1,2</c> tolerate any non negative integer
+ as exit status and truncate high order bits if the OS
+ does not support it.</p>
+ <p>
+ Own Id: OTP-13251 Aux Id: ERL-49 </p>
+ </item>
+ <item>
+ <p>
+ <seealso
+ marker="kernel:gen_tcp#accept/2"><c>gen_tcp:accept/2</c></seealso>
+ was not <seealso
+ marker="erts:time_correction#Time_Warp_Safe_Code">time
+ warp safe</seealso>. This since it used the same time as
+ returned by <seealso
+ marker="erts:erlang#now/0"><c>erlang:now/0</c></seealso>
+ when calculating timeout. This has now been fixed.</p>
+ <p>
+ Own Id: OTP-13254 Aux Id: OTP-11997, OTP-13222 </p>
+ </item>
+ <item>
+ <p>
+ Fix faulty error handling when writing to a compressed
+ file.</p>
+ <p>
+ Own Id: OTP-13270</p>
+ </item>
+ <item>
+ <p>
+ Fix sendfile usage for large files on FreeBSD</p>
+ <p>
+ Own Id: OTP-13271</p>
+ </item>
+ <item>
+ <p>
+ Fix bug that could cause
+ <c>process_info(P,current_location)</c> to crash emulator
+ for hipe compiled modules.</p>
+ <p>
+ Own Id: OTP-13282 Aux Id: ERL-79 </p>
+ </item>
+ <item>
+ <p>
+ Out of memory errors have been changed to cause an exit
+ instead of abort.</p>
+ <p>
+ Own Id: OTP-13292</p>
+ </item>
+ <item>
+ <p>
+ When calling <c>garbage_collect/[1,2]</c> or
+ <c>check_process_code/[2,3]</c> from a process with a
+ higher priority than the priority of the process operated
+ on, the run queues could end up in an inconsistent state.
+ This bug has now been fixed.</p>
+ <p>
+ Own Id: OTP-13298 Aux Id: OTP-11388 </p>
+ </item>
+ <item>
+ <p>
+ A workaround for an issue with older gcc versions (less
+ than 5) and inline assembly on 32-bit x86 caused an
+ emulator crash when it had been compiled with a newer gcc
+ version. An improved <c>configure</c> test, run when
+ building OTP, now detects whether the workaround should
+ be used or not.</p>
+ <p>
+ Own Id: OTP-13326 Aux Id: ERL-80 </p>
+ </item>
+ </list>
+ </section>
+
+
+ <section><title>Improvements and New Features</title>
+ <list>
+ <item>
+ <p>Introduced new statistics functionality in order to
+ more efficiently retrieve information about run able and
+ active processes and ports. For more information see:</p>
+ <list> <item><seealso
+ marker="erlang#statistics_total_run_queue_lengths"><c>statistics(total_run_queue_lengths)</c></seealso></item>
+ <item><seealso
+ marker="erlang#statistics_run_queue_lengths"><c>statistics(run_queue_lengths)</c></seealso></item>
+ <item><seealso
+ marker="erlang#statistics_total_active_tasks"><c>statistics(total_active_tasks)</c></seealso></item>
+ <item><seealso
+ marker="erlang#statistics_active_tasks"><c>statistics(active_tasks)</c></seealso></item>
+ </list>
+ <p>
+ Own Id: OTP-13201</p>
+ </item>
+ <item>
+ <p>
+ Time warp safety improvements.</p>
+ <p>
+ Introduced the options <c>monotonic_timestamp</c>, and
+ <c>strict_monotonic_timestamp</c> to the trace,
+ sequential trace, and system profile functionality. This
+ since the already existing <c>timestamp</c> option is not
+ time warp safe.</p>
+ <p>
+ Introduced the option <c>safe_fixed_monotonic_time</c> to
+ <c>ets:info/2</c> and <c>dets:info/2</c>. This since the
+ already existing <c>safe_fixed</c> option is not time
+ warp safe.</p>
+ <p>
+ Own Id: OTP-13222 Aux Id: OTP-11997 </p>
+ </item>
+ <item>
+ <p>
+ Fix a register race where down nodes goes undetected in
+ epmd</p>
+ <p>
+ Own Id: OTP-13301</p>
+ </item>
+ <item>
+ <p>
+ Improved the gcc inline assembly implementing double word
+ atomic compare and exchange on x86/x86_64 so that it also
+ can be used when compiling with clang.</p>
+ <p>
+ Own Id: OTP-13336</p>
+ </item>
+ <item>
+ <p>
+ An optimization preventing a long wait for a scheduler
+ thread looking up information about a process executing
+ on another scheduler thread had unintentionally been lost
+ in erts-5.10 (OTP R16A). This optimization has now been
+ reintroduced.</p>
+ <p>
+ Own Id: OTP-13365 Aux Id: OTP-9892 </p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
+<section><title>Erts 7.2.1</title>
+
+ <section><title>Fixed Bugs and Malfunctions</title>
+ <list>
+ <item>
+ <p>
+ Revert "Fix erroneous splitting of emulator path"</p>
+ <p>
+ Own Id: OTP-13202</p>
+ </item>
+ <item>
+ <p>
+ Fix HiPE enabled emulator for FreeBSD.</p>
+ <p>
+ Own Id: OTP-13204 Aux Id: pr926 </p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
+<section><title>Erts 7.2</title>
+
+ <section><title>Fixed Bugs and Malfunctions</title>
+ <list>
+ <item>
+ <p>
+ Small documentation fixes</p>
+ <p>
+ Own Id: OTP-13017</p>
+ </item>
+ <item>
+ <p>
+ Fix memory corruption bug caused by disabling
+ distribution and then re-enable distribution with a node
+ name that has previously been used by a remote node.</p>
+ <p>
+ Own Id: OTP-13076 Aux Id: seq12959 </p>
+ </item>
+ <item>
+ <p>
+ Renamed variables with name bool as Visual Studio 2015
+ now treats this is a keyword.</p>
+ <p>
+ Own Id: OTP-13079</p>
+ </item>
+ <item>
+ <p><c>erl_prim_loader</c> has not supported custom
+ loaders for several releases. In the documentation for
+ <c>erl_prim_loader</c>, all references to custom loaders
+ have now been removed.</p>
+ <p>
+ Own Id: OTP-13102</p>
+ </item>
+ <item>
+ <p>
+ Fixed compilation of erts together with libc versions
+ that do not define __uint32_t.</p>
+ <p>
+ Own Id: OTP-13105</p>
+ </item>
+ <item>
+ <p>
+ erl -make now returns non-zero exit codes on failure</p>
+ <p>
+ Own Id: OTP-13107</p>
+ </item>
+ <item>
+ <p>
+ Fix crash on init:restart in embedded mode caused by
+ on_load handler process not being relaunched leading to
+ load failure for modules such as crypto and asn1rt_nif
+ that need it to be present for correct NIF loading.</p>
+ <p>
+ Own Id: OTP-13115</p>
+ </item>
+ <item>
+ <p>
+ Fix maps decode in erlang:binary_to_term/1</p>
+ <p>Decoding a term with a large (HAMT) map in an small
+ (FLAT) map could cause a critical error if the external
+ format was not produced by beam.</p>
+ <p>
+ Own Id: OTP-13125</p>
+ </item>
+ <item>
+ <p>
+ Fix very rare bug in GC when big maps with a lot of hash
+ collisions from a remote node are waiting in inner
+ message queue.</p>
+ <p>
+ Own Id: OTP-13146</p>
+ </item>
+ <item>
+ <p>
+ Fixed a bug that could cause a crash dump to become
+ almost empty.</p>
+ <p>
+ Own Id: OTP-13150</p>
+ </item>
+ </list>
+ </section>
+
+
+ <section><title>Improvements and New Features</title>
+ <list>
+ <item>
+ <p> Updated the xmllint target to just check the xml
+ files with real documentation content.<br/> Corrected
+ some errors and added some missing target in the DTD's.
+ </p>
+ <p>
+ Own Id: OTP-13026</p>
+ </item>
+ <item>
+ <p>
+ Add function enif_getenv to read OS environment variables
+ in a portable way from NIFs.</p>
+ <p>
+ Own Id: OTP-13147</p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
+<section><title>Erts 7.1</title>
+ <section><title>Fixed Bugs and Malfunctions</title>
+ <list>
+ <item>
+ <p>
+ Fix bug in ETS that could cause stray objects marked for
+ deletion to occasionally be missed by the cleanup done by
+ <c>safe_fixtable(_,false)</c>.</p>
+ <p>
+ Own Id: OTP-12870</p>
+ </item>
+ <item>
+ <p>
+ Fixed VM crash that could occur if a trace port was
+ linked to a process, and the trace port terminated
+ abnormally while handling a trace message. This bug has
+ always existed in the runtime system with SMP support.</p>
+ <p>
+ Own Id: OTP-12901</p>
+ </item>
+ <item>
+ <p>
+ Instead of aborting, the vm now creates a crash dump when
+ a system process is terminated.</p>
+ <p>
+ Own Id: OTP-12934</p>
+ </item>
+ <item>
+ <p>
+ Fixed a rare emulator dead lock that occurred when
+ erlang:process_flag(priority,...) was called by a process
+ that was also scheduled for an internal system activity.</p>
+ <p>
+ Own Id: OTP-12943</p>
+ </item>
+ <item>
+ <p>
+ The runtime system on various posix platforms (except for
+ Linux and Solaris) could crash when large amounts of
+ file-descriptors were in use.</p>
+ <p>
+ Own Id: OTP-12954</p>
+ </item>
+ <item>
+ <p>
+ A beam file compiled by hipe for an incompatible runtime
+ system was sometimes not rejected by the loader, which
+ could lead to vm crash. This fix will also allow the same
+ hipe compiler to be used by both normal and debug-built
+ vm.</p>
+ <p>
+ Own Id: OTP-12962</p>
+ </item>
+ <item>
+ <p>
+ Fix bug in <c>maps:merge/2</c> when called by hipe
+ compiled code that could cause vm crash. Bug exists since
+ erts-7.0 (OTP 18.0).</p>
+ <p>
+ Own Id: OTP-12965</p>
+ </item>
+ <item>
+ <p>
+ When tracing with <c>process_dump</c> option, the VM
+ could abort if there was an ongoing binary match
+ somewhere in the call stack of the traced process.</p>
+ <p>
+ Own Id: OTP-12968</p>
+ </item>
+ <item>
+ <p>
+ Fixed possible output deadlock in tty driver when hitting
+ "CTRL-C" in a non-smp emulator shell on unix.</p>
+ <p>
+ Own Id: OTP-12987 Aux Id: Seq12947 </p>
+ </item>
+ <item>
+ <p>
+ Fix <c>binary_to_integer</c> to throw badarg for "+" and
+ "-" similar to <c>list_to_integer</c>.</p>
+ <p>
+ Own Id: OTP-12988</p>
+ </item>
+ <item>
+ <p>
+ Suppress warning of unused argument when using macro
+ enif_make_pid.</p>
+ <p>
+ Own Id: OTP-12989</p>
+ </item>
+ </list>
+ </section>
+
+
+ <section><title>Improvements and New Features</title>
+ <list>
+ <item>
+ <p>
+ Changed default clock source used for OS system time on
+ MacOS X to <c>gettimeofday()</c> in order to improve
+ performance. The system can be configured during build to
+ use the previously used higher resolution clock source by
+ passing the switch <seealso
+ marker="doc/installation_guide:INSTALL#Advanced-configuration-and-build-of-ErlangOTP_Configuring"><c>--with-clock-resolution=high</c></seealso>
+ when configuring the build.</p>
+ <p>
+ Own Id: OTP-12945 Aux Id: OTP-12892 </p>
+ </item>
+ <item>
+ <p>
+ Added the <c>configure</c> option <seealso
+ marker="doc/installation_guide:INSTALL#Advanced-configuration-and-build-of-ErlangOTP_Configuring"><c>--disable-saved-compile-time</c></seealso>
+ which disables saving of compile date and time in the
+ emulator binary.</p>
+ <p>
+ Own Id: OTP-12971</p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
+<section><title>Erts 7.0.3</title>
+
+ <section><title>Fixed Bugs and Malfunctions</title>
+ <list>
+ <item>
+ <p>
+ Fixed a binary memory leak when printing to shell using
+ the tty driver (i.e. not -oldshell).</p>
+ <p>
+ Own Id: OTP-12941</p>
+ </item>
+ <item>
+ <p>
+ Fix a bug where the standard error port sometimes crashes
+ with eagain as the reason.</p>
+ <p>
+ Own Id: OTP-12942</p>
+ </item>
+ <item>
+ <p>
+ When tracing with <c>process_dump</c> option, the VM
+ could abort if there was an ongoing binary match
+ somewhere in the call stack of the traced process./</p>
+ <p>
+ Own Id: OTP-12968</p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
+<section><title>Erts 7.0.2</title>
+
+ <section><title>Fixed Bugs and Malfunctions</title>
+ <list>
+ <item>
+ <p>
+ A process could end up in an inconsistent half exited
+ state in the runtime system without SMP support. This
+ could occur if the processes was traced by a port that it
+ also was linked to, and the port terminated abnormally
+ while handling a trace message for the process.</p>
+ <p>
+ This bug has always existed in the runtime system without
+ SMP support, but never in the runtime system with SMP
+ support.</p>
+ <p>
+ Own Id: OTP-12889 Aux Id: seq12885 </p>
+ </item>
+ <item>
+ <p>
+ Removed unnecessary copying of data when retrieving
+ corrected Erlang monotonic time.</p>
+ <p>
+ Own Id: OTP-12894</p>
+ </item>
+ <item>
+ <p>
+ Changed default OS monotonic clock source chosen at build
+ time. This in order to improve performance. The behavior
+ will now on most systems be that (both OS and Erlang)
+ monotonic time stops when the system is suspended.</p>
+ <p>
+ If you prefer that monotonic time elapse during suspend
+ of the machine, you can pass the command line argument
+ <c>--enable-prefer-elapsed-monotonic-time-during-suspend</c>
+ to <c>configure</c> when building Erlang/OTP. The
+ configuration stage will try to find such a clock source,
+ but might not be able to find it. Note that there might
+ be a performance penalty associated with such a clock
+ source.</p>
+ <p>
+ *** POTENTIAL INCOMPATIBILITY ***</p>
+ <p>
+ Own Id: OTP-12895</p>
+ </item>
+ <item>
+ <p>
+ <c>erlang:system_info(end_time)</c> returned a faulty
+ value on 32-bit architectures.</p>
+ <p>
+ Own Id: OTP-12896</p>
+ </item>
+ </list>
+ </section>
+
+
+ <section><title>Improvements and New Features</title>
+ <list>
+ <item>
+ <p>
+ The <c>configure</c> command line argument
+ <c>--enable-gettimeofday-as-os-system-time</c> has been
+ added which force usage of <c>gettimeofday()</c> for OS
+ system time. This will improve performance of
+ <c>os:system_time()</c> and <c>os:timestamp()</c> on
+ MacOS X, at the expense of worse accuracy, resolution and
+ precision of Erlang monotonic time, Erlang system time,
+ and OS system time.</p>
+ <p>
+ Own Id: OTP-12892</p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
+<section><title>Erts 7.0.1</title>
+
+ <section><title>Fixed Bugs and Malfunctions</title>
+ <list>
+ <item>
+ <p>
+ Fix a rare hanging of the VM seen to happen just after
+ emulator start. Bug exists since R14.</p>
+ <p>
+ Own Id: OTP-12859 Aux Id: seq12882 </p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
+<section><title>Erts 7.0</title>
+
+ <section><title>Fixed Bugs and Malfunctions</title>
+ <list>
+ <item>
+ <p>
+ Fix issuing with spaces and quoting in the arguments when
+ using erlang:open_port spawn_executable on windows. The
+ behavior now mimics how unix works. This change implies a
+ backwards incompatibility for how spawn_executable works
+ on windows.</p>
+ <p>
+ *** POTENTIAL INCOMPATIBILITY ***</p>
+ <p>
+ Own Id: OTP-11905</p>
+ </item>
+ <item>
+ <p>
+ Fix global call trace when hipe compiled code call beam
+ compiled functions. Tracing of beam functions should now
+ alway work regardless who the caller is.</p>
+ <p>
+ Own Id: OTP-11939</p>
+ </item>
+ <item>
+ <p>
+ Correct cache alignment for ETS <c>write_concurrency</c>
+ locks to improve performance by reduced false sharing.
+ May increase memory footprint for tables with
+ <c>write_concurrency</c>.</p>
+ <p>
+ Own Id: OTP-11974</p>
+ </item>
+ <item>
+ <p>
+ All possibly blocking operations in the fd/spawn and
+ terminal driver have been converted to non-blocking
+ operations. Before this fix it was possible for the VM to
+ be blocked for a long time if the entity consuming
+ stdout/stderr did not consume it fast enough.</p>
+ <p>
+ Own Id: OTP-12239</p>
+ </item>
+ <item>
+ <p>
+ Add missing overhead for offheap binaries created from
+ external format. This fix can improve the garbage
+ collection of large binaries originating from
+ <c>binary_to_term</c> or messages from remote nodes.</p>
+ <p>
+ Own Id: OTP-12554</p>
+ </item>
+ <item>
+ <p>
+ Ensure hashing of zero is consistent</p>
+ <p> Erlang treats positive and negative zero as
+ equal:</p>
+ <p>
+ <c>true = 0.0 =:= 0.0/-1</c></p>
+ <p>However, Erlangs hash functions: hash, phash and
+ phash2 did not reflect this behaviour. The hash values
+ produced by the different hash functions would not be
+ identical for positive and negative zero.</p> <p>This
+ change ensures that hash value of positive zero is always
+ produced regardless of the signedness of the zero float,
+ i.e.,</p>
+ <p>
+ <c>true = erlang:phash2(0.0) =:=
+ erlang:phash2(0.0/-1)</c></p>
+ <p>
+ Own Id: OTP-12641</p>
+ </item>
+ <item>
+ <p>
+ Ensure NIF term creation disallows illegal floating point
+ values and too long atoms. Such values will cause a NIF
+ to throw badarg exception when it returns.</p>
+ <p>
+ Own Id: OTP-12655</p>
+ </item>
+ <item>
+ <p>
+ Fixed building of Map results from match_specs</p>
+ <p>
+ A faulty "box-value" entered into the heap which could
+ cause a segmentation fault in the garbage collector if it
+ was written on a heap fragment.</p>
+ <p>
+ Own Id: OTP-12656</p>
+ </item>
+ <item>
+ <p>
+ Fix hipe bug when matching a "writable" binary. The bug
+ has been seen to sometimes cause a failed binary matching
+ of a correct utf8 character, but other symptoms are also
+ possible.</p>
+ <p>
+ Own Id: OTP-12667</p>
+ </item>
+ <item>
+ <p>
+ Keep dirty schedulers from waking other schedulers.</p>
+ <p>
+ Own Id: OTP-12685</p>
+ </item>
+ <item>
+ <p>
+ Disable floating point exceptions if the VM is compiled
+ by clang/llvm. This is a known long-standing problem in
+ clang/llvm.</p>
+ <p>
+ Own Id: OTP-12717</p>
+ </item>
+ <item>
+ <p>
+ Fix bug in <c>file:sendfile</c> for FreeBSD causing not
+ the entire file to be sent.</p>
+ <p>
+ Own Id: OTP-12720</p>
+ </item>
+ <item>
+ <p>
+ Fix the broken Android support in erl_child_setup.c</p>
+ <p>
+ Own Id: OTP-12751</p>
+ </item>
+ <item>
+ <p>
+ Faulty statistics reported by the <c>fix_alloc</c>
+ allocator.</p>
+ <p>
+ Own Id: OTP-12766</p>
+ </item>
+ <item>
+ <p>
+ Fix two erts_snprintf() calls to correct sizes.</p>
+ <p>
+ - run_erl.c (ose): Use the size of the signal type, not
+ its pointer. - erl_node_tables.c: Use the size of the
+ _BUFFER in erts_snprintf() to make sure we can use the
+ full space.</p>
+ <p>
+ Own Id: OTP-12771</p>
+ </item>
+ <item>
+ <p>
+ Delayed memory allocations could be delayed an
+ unnecessarily long time.</p>
+ <p>
+ Own Id: OTP-12812</p>
+ </item>
+ <item>
+ <p>
+ Make sure that timeouts on a pool of acceptors are
+ released in the correct order.</p>
+ <p>
+ Own Id: OTP-12817</p>
+ </item>
+ <item>
+ <p>
+ Fix segmentation fault in module_info for deleted modules</p>
+ <p>
+ Own Id: OTP-12820</p>
+ </item>
+ <item>
+ <p>Fix garbage collection of literals in code purge</p>
+ <p>During code purging and check_process_code, the
+ checking of the binary reference embedded in the match
+ binary state was omitted for the tracing tests. This
+ would cause the binary match state to reference
+ deallocated memory.</p>
+ <p>
+ Own Id: OTP-12821</p>
+ </item>
+ <item>
+ <p>
+ A bug has been corrected for gen_tcp:close so when
+ {linger,{true,0}} is in effect it does not wait for data
+ in the driver queue to transfer out before closing the
+ port. Bug fix by Rory Byrne.</p>
+ <p>
+ Own Id: OTP-12840</p>
+ </item>
+ <item>
+ <p>
+ The documentation of the driver callback <seealso
+ marker="driver_entry#start"><c>start()</c></seealso>
+ erroneously stated that a return value of
+ <c>ERL_DRV_ERROR_ERRNO</c> caused the error value to be
+ passed via <c>erl_errno</c> when it should have been
+ <c>errno</c>.</p>
+ <p>
+ Own Id: OTP-12855</p>
+ </item>
+ </list>
+ </section>
+
+
+ <section><title>Improvements and New Features</title>
+ <list>
+ <item>
+ <p>
+ Add <c>md5</c> and <c>module</c> entries to
+ <c>?MODULE:module_info/0/1</c> and remove obsolete entry
+ 'import'.</p>
+ <p>
+ *** POTENTIAL INCOMPATIBILITY ***</p>
+ <p>
+ Own Id: OTP-11940</p>
+ </item>
+ <item>
+ <p>
+ Debug function <c>erlang:display/1</c> shows content of
+ binaries and bitstrings, not only the length.</p>
+ <p>
+ Own Id: OTP-11941</p>
+ </item>
+ <item>
+ <p>The time functionality of Erlang has been extended.
+ This both includes a <seealso
+ marker="time_correction#The_New_Time_API">new
+ API</seealso> for time, as well as <seealso
+ marker="time_correction#Time_Warp_Modes">time warp
+ modes</seealso> which alters the behavior of the system
+ when system time changes. <em>You are strongly encouraged
+ to use the new API</em> instead of the old API based on
+ <seealso
+ marker="erlang#now/0"><c>erlang:now/0</c></seealso>.
+ <c>erlang:now/0</c> has been deprecated since it is and
+ forever will be a scalability bottleneck. For more
+ information see the <seealso
+ marker="time_correction">Time and Time
+ Correction</seealso> chapter of the ERTS User's
+ Guide.</p>
+ <p>Besides the API changes and time warp modes a lot of
+ scalability and performance improvements regarding time
+ management has been made internally in the runtime
+ system. Examples of such improvements are scheduler
+ specific timer wheels, scheduler specific BIF timer
+ management, parallel retrieval of monotonic time and
+ system time on systems with primitives that are not
+ buggy.</p>
+ <p>
+ Own Id: OTP-11997</p>
+ </item>
+ <item>
+ <p><c>erlang:function_exported(M, F, A)</c> will now
+ return <c>true</c> if <c>M:F/A</c> refers to a BIF.</p>
+ <p>
+ *** POTENTIAL INCOMPATIBILITY ***</p>
+ <p>
+ Own Id: OTP-12099</p>
+ </item>
+ <item>
+ <p>
+ New BIF: <c>erlang:get_keys/0</c>, lists all keys
+ associated with the process dictionary. Note:
+ <c>erlang:get_keys/0</c> is auto-imported.</p>
+ <p>
+ *** POTENTIAL INCOMPATIBILITY ***</p>
+ <p>
+ Own Id: OTP-12151 Aux Id: seq12521 </p>
+ </item>
+ <item>
+ <p>
+ Make distributed send of large messages yield to improve
+ real-time characteristics.</p>
+ <p>
+ Own Id: OTP-12232</p>
+ </item>
+ <item>
+ <p>
+ Use high accuracy poll timeouts</p>
+ <p>
+ Where available, use poll/select API's that can handle
+ time resolutions less than 1ms. In the cases where such
+ API's are not available the timeout is rounded up to the
+ nearest ms.</p>
+ <p>
+ Own Id: OTP-12236</p>
+ </item>
+ <item>
+ <p>
+ The internal group to user_drv protocol has been changed
+ to be synchronous in order to guarantee that output sent
+ to a process implementing the user_drv protocol is
+ printed before replying. This protocol is used by the
+ standard_output device and the ssh application when
+ acting as a client. </p>
+ <p>
+ This change changes the previous unlimited buffer when
+ printing to standard_io and other devices that end up in
+ user_drv to 1KB.</p>
+ <p>
+ *** POTENTIAL INCOMPATIBILITY ***</p>
+ <p>
+ Own Id: OTP-12240</p>
+ </item>
+ <item>
+ <p>The previously introduced "eager check I/O" feature is
+ now enabled by default.</p>
+ <p>Eager check I/O can be disabled using the <c>erl</c>
+ command line argument: <seealso
+ marker="erl#+secio"><c>+secio false</c></seealso></p>
+ <p>Characteristics impact compared to previous
+ default:</p> <list> <item>Lower latency and smoother
+ management of externally triggered I/O operations.</item>
+ <item>A slightly reduced priority of externally triggered
+ I/O operations.</item> </list>
+ <p>
+ Own Id: OTP-12254 Aux Id: OTP-12117 </p>
+ </item>
+ <item>
+ <p>
+ Properly support maps in match_specs</p>
+ <p>
+ Own Id: OTP-12270</p>
+ </item>
+ <item>
+ <p>
+ The notice that a crashdump has been written has been
+ moved to be printed before the crashdump is generated
+ instead of afterwords. The wording of the notice has also
+ been changed.</p>
+ <p>
+ *** POTENTIAL INCOMPATIBILITY ***</p>
+ <p>
+ Own Id: OTP-12292</p>
+ </item>
+ <item>
+ <p>
+ New function <c>ets:take/2</c>. Works the same as
+ <c>ets:delete/2</c> but also returns the deleted
+ object(s).</p>
+ <p>
+ Own Id: OTP-12309</p>
+ </item>
+ <item>
+ <p>
+ Tracing with cpu_timestamp option has been enabled on
+ Linux.</p>
+ <p>
+ Own Id: OTP-12366</p>
+ </item>
+ <item>
+ <p>
+ ets:info/1,2 now contains information about whether
+ write_concurrency or read_concurrency is enabled.</p>
+ <p>
+ Own Id: OTP-12376</p>
+ </item>
+ <item>
+ <p>
+ Improved usage of <c>gcc</c>'s builtins for atomic memory
+ access. These are used when no other implementation of
+ atomic memory operations is available. For example, when
+ compiling for ARM when <c>libatomic_ops</c> is not
+ available.</p>
+ <p>
+ The largest improvement will be seen when compiling with
+ a <c>gcc</c> with support for the <c>__atomic_*</c>
+ builtins (using a <c>gcc</c> of at least version 4.7),
+ but also when only the legacy <c>__sync_*</c> builtins
+ are available (using a <c>gcc</c> of at least version
+ 4.1) an improvement can be seen.</p>
+ <p>
+ For more information see the "<seealso
+ marker="doc/installation_guide:INSTALL#Advanced-configuration-and-build-of-ErlangOTP_Configuring_Atomic-Memory-Operations-and-the-VM">Atomic
+ Memory Operations and the VM</seealso>" section of
+ <c>$ERL_TOP/HOWTO/INSTALL.md</c>.</p>
+ <p>
+ Own Id: OTP-12383</p>
+ </item>
+ <item>
+ <p>
+ Introduce <c>math:log2/1</c> function to math module.</p>
+ <p>
+ Own Id: OTP-12411</p>
+ </item>
+ <item>
+ <p>The documentation of the Abstract Format (in the ERTS
+ User's Guide) has been updated with types and
+ specification. (Thanks to Anthony Ramine.) </p> <p> The
+ explicit representation of parentheses used in types of
+ the abstract format has been removed. Instead the new
+ functions <c>erl_parse:type_inop_prec()</c> and
+ <c>erl_parse:type_preop_prec()</c> can be used for
+ inserting parentheses where needed. </p>
+ <p>
+ Own Id: OTP-12492</p>
+ </item>
+ <item>
+ <p>
+ Remove perfctr support</p>
+ <p>
+ Development of perfctr in the linux kernel ceased in
+ 2010. The perfctr support code in the Erlang VM is thus
+ effectively dead code and therefor removed.</p>
+ <p>
+ Own Id: OTP-12508</p>
+ </item>
+ <item>
+ <p><c>zlib:inflateChunk/2</c> has been added. It works
+ like <c>zlib:inflate/2</c>, but decompresses no more data
+ than will fit in the buffer configured by
+ <c>zlib:setBufSize/2</c>.</p>
+ <p>
+ Own Id: OTP-12548</p>
+ </item>
+ <item>
+ <p>
+ Use linear search for small select_val arrays</p>
+ <p>
+ Own Id: OTP-12555</p>
+ </item>
+ <item>
+ <p>
+ New BIF ets:update_counter/4 with a default object as
+ argument, which will be inserted in the table if the key
+ was not found.</p>
+ <p>
+ Own Id: OTP-12563</p>
+ </item>
+ <item>
+ <p>
+ Export missing types from zlib module</p>
+ <p>
+ Own Id: OTP-12584</p>
+ </item>
+ <item>
+ <p>
+ Use persistent hashmaps for large Maps</p>
+ <p>Maps will use a
+ persistent hashmap implementation when the number of
+ pairs in a Map becomes sufficiently large. The change
+ will occur when a Map reaches 33 pairs in size but this
+ limit might change in the future.</p>
+ <p>The most significant impact for the user by this
+ change is speed, and to a lesser degree memory
+ consumption and introspection of Maps. Memory consumption
+ size is probalistic but lesser than <c>gb_trees</c> or
+ <c>dict</c> for instance. Any other impacts will be
+ transparent for the user except for the following
+ changes.</p>
+ <p>Semantics of Maps have changed in two incompatible
+ ways compared to the experimental implementation in OTP
+ 17:</p> <list> <item>Hashing of maps is done different by
+ <c>erlang:phash2/1,2</c>, <c>erlang:phash/1</c> and
+ <c>erlang:hash/2</c>.</item> <item>Comparing two maps
+ with ==, /=, =&lt;, &lt;, &gt;= and &gt;, is done
+ different if the keys contain floating point
+ numbers.</item> </list>
+ <p>
+ *** POTENTIAL INCOMPATIBILITY ***</p>
+ <p>
+ Own Id: OTP-12585</p>
+ </item>
+ <item>
+ <p>
+ Scalability improvement for <seealso
+ marker="erlang#make_ref/0">erlang:make_ref/0</seealso>,
+ and other functionality that create references. Each
+ scheduler now manage its own set of references. By this
+ no communication at all is needed when creating
+ references.</p>
+ <p>
+ Previous implementation generated a strictly
+ monotonically increasing sequence of references
+ corresponding to creation time on the runtime system
+ instance. This is <em>not</em> the case with current
+ implementation. You can only expect reference to be
+ unique. The Erlang/OTP documentation has never mentioned
+ anything else but the uniqueness property, so this change
+ <em>is</em> fully compatible. The only reason we've
+ marked this as a potential incompatibility is since an
+ early draft for an Erlang specification mentions strict
+ monotonicity as a property.</p>
+ <p>
+ If you need to create data with a strict monotonicity
+ property use <seealso
+ marker="erlang#unique_integer/1">erlang:unique_integer([monotonic])</seealso>.
+ Do <em>not</em> use the deprecated <seealso
+ marker="erlang#now/0">erlang:now()</seealso>.</p>
+ <p>
+ *** POTENTIAL INCOMPATIBILITY ***</p>
+ <p>
+ Own Id: OTP-12610</p>
+ </item>
+ <item>
+ <p>
+ Enable different abort signal from heart</p>
+ <p>By using environment variable HEART_KILL_SIGNAL, heart
+ can now use a different signal to kill the old running
+ Erlang.</p>
+ <p>By default the signal is SIGKILL but SIGABRT may also
+ be used by setting environment variable:
+ HEART_KILL_SIGNAL=SIGABRT</p>
+ <p>
+ Own Id: OTP-12613 Aux Id: seq12826 </p>
+ </item>
+ <item>
+ <p>
+ Update autconf to latest version 2015-03-04</p>
+ <p>
+ Own Id: OTP-12646</p>
+ </item>
+ <item>
+ <p>
+ Optimization of timers internally in the VM. This include
+ process timers (<c>receive ... after</c>), port timers
+ (<c>driver_set_timer()</c>) as well as BIF timers
+ (<c>erlang:send_after()</c>/<c>erlang:start_timer()</c>).</p>
+ <p>
+ Each scheduler thread now has its own lock-free timer
+ service instead of one locked central service. This
+ dramatically improves performance of timer management on
+ systems with a large amount of schedulers and timers.</p>
+ <p>
+ The timer service internal data structure has also been
+ optimized to be able to handle more timers than before.
+ That is, each timer service is by its self able to handle
+ more timers without dramatic performance loss than the
+ old centralized timer service.</p>
+ <p>
+ The API of BIF timers has also been extended. Timeout
+ values are for example no longer limited to 32-bit
+ integers. For more information see the documentation of
+ <seealso
+ marker="erlang#start_timer/4"><c>erlang:start_timer/4</c></seealso>,
+ <seealso
+ marker="erlang#send_after/4"><c>erlang:send_after/4</c></seealso>,
+ <seealso
+ marker="erlang#cancel_timer/2"><c>erlang:cancel_timer/2</c></seealso>,
+ and <seealso
+ marker="erlang#read_timer/2"><c>erlang:read_timer/2</c></seealso>.</p>
+ <p>
+ Characteristics impact: Calls to the synchronous versions
+ of <c>erlang:cancel_timer()</c>, and
+ <c>erlang:read_timer()</c> may take substantially longer
+ time to complete than before. This occur when the timer
+ that is accessed is managed by a remote scheduler. You
+ typically want to use the new asynchronous option in
+ order to avoid blocking the calling process.</p>
+ <p>
+ Own Id: OTP-12650 Aux Id: OTP-11997 </p>
+ </item>
+ <item>
+ <p>
+ Specialize instructions from common assembler patterns</p>
+ <p>Specialize common instructions of <c>rem</c>,
+ <c>band</c>, <c>minus</c> and <c>plus</c> in the beam
+ loader. This will reduce the number of fetches and thus
+ lessen the instruction dispatch pressure during runtime
+ and speed up those operations in some common cases.</p>
+ <p>Specialize move patterns from x-registers to the stack
+ with a new <c>move_window</c> instruction. This change
+ will reduce instruction dispatch pressure.</p>
+ <p>
+ Own Id: OTP-12690</p>
+ </item>
+ <item>
+ <p>
+ Fix cross compilation for Android.</p>
+ <p>
+ Own Id: OTP-12693</p>
+ </item>
+ <item>
+ <p>
+ Fix incorrect use of autoconf macro AC_EGREP_CPP, which
+ could cause faulty configuration if run from a path
+ containing the string 'yes'.</p>
+ <p>
+ Own Id: OTP-12706</p>
+ </item>
+ <item>
+ <p>
+ Minimal Java version is now 1.6</p>
+ <p>
+ Own Id: OTP-12715</p>
+ </item>
+ <item>
+ <p>
+ Send format and args on process exit to error_logger</p>
+ <p>
+ Previously, the emulator would generate a whole string
+ with values and call the error_logger passing
+ <c>"~s~n"</c>. This changes it to a format string
+ containing <c>~p</c> with the respective values as
+ arguments.</p>
+ <p>
+ Own Id: OTP-12735</p>
+ </item>
+ <item>
+ <p>
+ Map error logger warnings to warning messages by default.</p>
+ <p>
+ Own Id: OTP-12755</p>
+ </item>
+ <item>
+ <p>
+ Configure architecture ppc64le architecture as a ppc64</p>
+ <p>
+ Own Id: OTP-12761</p>
+ </item>
+ <item>
+ <p>
+ Add function <c>enif_raise_exception</c> to allow a NIF
+ to raise an error exception with any type of reason.</p>
+ <p>
+ Own Id: OTP-12770</p>
+ </item>
+ <item>
+ <p>
+ Optimized node table statistics retrieval.</p>
+ <p>
+ Own Id: OTP-12777</p>
+ </item>
+ <item>
+ <p>
+ Map beam error logger warnings to warning messages by
+ default. Previously these messages were mapped to the
+ error channel by default.</p>
+ <p>
+ Own Id: OTP-12781</p>
+ </item>
+ <item>
+ <p>
+ gen_tcp:shutdown/2 is now asynchronous</p>
+ <p>
+ This solves the following problems with the old
+ implementation:</p>
+ <p>
+ It doesn't block when the TCP peer is idle or slow. This
+ is the expected behaviour when shutdown() is called: the
+ caller needs to be able to continue reading from the
+ socket, not be prevented from doing so.</p>
+ <p>
+ It doesn't truncate the output. The current version of
+ gen_tcp:shutdown/2 will truncate any outbound data in the
+ driver queue after about 10 seconds if the TCP peer is
+ idle of slow. Worse yet, it doesn't even inform anyone
+ that the data has been truncated: 'ok' is returned to the
+ caller; and a FIN rather than an RST is sent to the TCP
+ peer.</p>
+ <p>
+ *** POTENTIAL INCOMPATIBILITY ***</p>
+ <p>
+ Own Id: OTP-12797</p>
+ </item>
+ <item>
+ <p>
+ Introduced delayed node table GC. This in order to avoid
+ oscillation of entries in and out of the tables. The
+ oscillation caused unnecessary lock contention on the
+ table locks. The delay length can be set by passing the
+ <seealso marker="erl#+zdntgc"><c>+zdntgc</c></seealso>
+ command line argument.</p>
+ <p>
+ Characteristics impact: The tables can grow to very large
+ sizes with unused entries if the node is get huge amounts
+ of short lived connections from other nodes. This problem
+ can be alleviated by shortening the length of the delay
+ using the <c>+zdntgc</c> command line argument.</p>
+ <p>
+ Own Id: OTP-12802</p>
+ </item>
+ <item>
+ <p>Improved implementation of <seealso
+ marker="erlang#statistics/1"><c>erlang:statistics</c></seealso><c>(io)</c>
+ in order to reduce contention between schedulers.</p>
+ <p>Characteristics impact: The actual call to
+ <c>erlang:statistics(io)</c> takes longer time to
+ complete, but the overall impact on the system is
+ improved.</p>
+ <p>
+ Own Id: OTP-12842</p>
+ </item>
+ <item>
+ <p>
+ There are many cases where user code needs to be able to
+ distinguish between a socket that was closed normally and
+ one that was aborted. Setting the option
+ {show_econnreset, true} enables the user to receive
+ ECONNRESET errors on both active and passive sockets.</p>
+ <p>
+ Own Id: OTP-12843</p>
+ </item>
+ <item>
+ <p>
+ Do not preallocate too large event pool</p>
+ <p>
+ A default pool size of 4000 is too excessive for the
+ common case. This corresponds directly to the number of
+ threads in the system. Change
+ ERTS_TS_EV_ALLOC_DEFAULT_POOL_SIZE to 2048. Change
+ ERTS_TS_EV_ALLOC_POOL_SIZE to 32.</p>
+ <p>
+ Own Id: OTP-12849</p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
+<section><title>Erts 6.4.1.5</title>
+
+ <section><title>Fixed Bugs and Malfunctions</title>
+ <list>
+ <item>
+ <p>
+ Fixed a bug that could cause a crash dump to become
+ almost empty.</p>
+ <p>
+ Own Id: OTP-13150</p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
+<section><title>Erts 6.4.1.4</title>
+
+ <section><title>Fixed Bugs and Malfunctions</title>
+ <list>
+ <item>
+ <p>
+ The 'raw' socket option could not be used multiple times
+ in one call to any e.g gen_tcp function because only one
+ of the occurrences were used. This bug has been fixed,
+ and also a small bug concerning propagating error codes
+ from within inet:setopts/2.</p>
+ <p>
+ Own Id: OTP-11482 Aux Id: seq12872 </p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
+
+<section><title>Erts 6.4.1</title>
+
+ <section><title>Fixed Bugs and Malfunctions</title>
+ <list>
+ <item>
+ <p>
+ The VTS mode in Common Test has been modified to use a
+ private version of the Webtool application (ct_webtool).</p>
+ <p>
+ Own Id: OTP-12704 Aux Id: OTP-10922 </p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
+<section><title>Erts 6.4</title>
+
+ <section><title>Fixed Bugs and Malfunctions</title>
+ <list>
+ <item>
+ <p>
+ Fix missing quotation in the <c>LM_FIND_EMU_CC</c>
+ <c>autoconf</c> macro which could cause build failures.</p>
+ <p>
+ Own Id: OTP-12388</p>
+ </item>
+ <item>
+ <p>
+ Fix erroneous printout of monitors in crashdump file.</p>
+ <p>
+ Own Id: OTP-12537</p>
+ </item>
+ <item>
+ <p>
+ The runtime system without SMP support could crash in the
+ BIF <c>port_control/3</c> if the port that was being
+ accessed died during the call to the BIF.</p>
+ <p>
+ Own Id: OTP-12544 Aux Id: Seq12777 </p>
+ </item>
+ <item>
+ <p>
+ Avoid corrupt oversized integer to be created from binary
+ matching. Instead throw system_limit exception which is
+ the correct behavior. A peculiar symptom of this bug was
+ that bitwise operations (band, bor, bxor) on such
+ oversized integers could return the empty list [].
+ Credit: Mikael Pettersson, Nico Kruber</p>
+ <p>
+ Own Id: OTP-12556</p>
+ </item>
+ <item>
+ <p>
+ A race condition when calling <c>port_info/1</c> could
+ cause a memory fault has been fixed.</p>
+ <p>
+ Own Id: OTP-12587</p>
+ </item>
+ <item>
+ <p>
+ Fix comparison of exact terms. An overflow that could
+ cause faulty comparisons has been fixed. Comparison of
+ exact terms is exclusively used within Maps.</p>
+ <p>
+ Own Id: OTP-12623</p>
+ </item>
+ <item>
+ <p>
+ Fix bug in <c>list_to_integer/1</c> for very long lists
+ that could cause VM crash.</p>
+ <p>
+ Own Id: OTP-12624</p>
+ </item>
+ </list>
+ </section>
+
+
+ <section><title>Improvements and New Features</title>
+ <list>
+ <item>
+ <p>
+ Introduced a runtime system internal 64-bit API for
+ atomic memory operations.</p>
+ <p>
+ Own Id: OTP-12351</p>
+ </item>
+ <item>
+ <p>
+ Add command line argument option for the initial size of
+ process dictionaries.</p>
+ <p>
+ Use '+hpds &lt;size&gt;' to set initial process
+ dictionary size for spawned processes.</p>
+ <p>
+ Own Id: OTP-12535 Aux Id: seq12809 </p>
+ </item>
+ <item>
+ <p>
+ Fix documentation on $char for Unicode</p>
+ <p>
+ Own Id: OTP-12545</p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
+<section><title>Erts 6.3.1</title>
+
+ <section><title>Fixed Bugs and Malfunctions</title>
+ <list>
+ <item>
+ <p>
+ Fix getifaddrs realloc pointer error</p>
+ <p>
+ When a buffer was exhausted and subsequently reallocated,
+ we could get an unsafe pointer pointing to faulty memory.</p>
+ <p>
+ For this to occur we would need to have a large number of
+ interfaces and a reallocation of memory to a lower
+ addresses.</p>
+ <p>
+ The symptom would be garbage returned from
+ erlang:port_control(Port, 25, [])
+ (prim_inet:getifaddrs(Port) resulting in a badarg) or a
+ segmentation fault.</p>
+ <p>
+ Own Id: OTP-12445</p>
+ </item>
+ <item>
+ <p>
+ Don't close all file descriptors twice in child_setup</p>
+ <p>
+ The commit c2b4eab25c907f453a394d382c04cd04e6c06b49
+ introduced an error in which child_setup erroneously
+ tried to close all file descriptors twice.</p>
+ <p>
+ Use closefrom() if available when closing all file
+ descriptors.</p>
+ <p>
+ The function closefrom() was only used in the vfork()
+ case before but is now also used in the fork() case if
+ available.</p>
+ <p>
+ Own Id: OTP-12446</p>
+ </item>
+ <item>
+ <p>
+ During a crashdump all file descriptors are closed to
+ ensure the closing of the epmd port and to reserve a file
+ descriptor for the crashdump file.</p>
+ <p>
+ If a driver (third party library) cannot handle closing
+ of sockets this could result in a segmentation fault in
+ which case a crashdump would not be produced. This is now
+ fixed by only closing inets sockets via an emergency
+ close callback to the driver and thus closing the epmd
+ socket.</p>
+ <p>
+ Own Id: OTP-12447</p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
+<section><title>Erts 6.3</title>
+
+ <section><title>Fixed Bugs and Malfunctions</title>
+ <list>
+ <item>
+ <p>
+ Fix HiPE debug lock checking on OS X 64bit</p>
+ <p>
+ Position-independent code is mandatory on OS X. We use
+ r11 as an intermediate register to fill
+ BIF_P-&gt;hipe.bif_callee. This fixes the following error
+ when doing `make debug FLAVOR=smp`:</p>
+ <p>
+ clang -cc1as: fatal error: error in backend: 32-bit
+ absolute addressing is not supported in 64-bit mode</p>
+ <p>
+ Own Id: OTP-12188</p>
+ </item>
+ <item>
+ <p>
+ Fix race bug that could cause VM crash in
+ <c>erlang:port_get_data/1</c> if the port was closed by a
+ concurrent process. Also fix fatal bug if
+ <c>port_set_data/2</c> is called with a non-immediate
+ data term. Both bugs exist since R16B01.</p>
+ <p>
+ Own Id: OTP-12208</p>
+ </item>
+ <item>
+ <p>
+ Correct make variable SSL_DED_LD_RUNTIME_LIBRARY_PATH
+ when erl_xcomp_sysroot ends with a slash.</p>
+ <p>
+ Own Id: OTP-12216 Aux Id: seq12700 </p>
+ </item>
+ <item>
+ <p>
+ Fix two cases of unreachable code caused by false use of
+ assigment operators.</p>
+ <p>
+ Own Id: OTP-12222</p>
+ </item>
+ <item>
+ <p>
+ Fix bug when hipe compiled code makes tail call to a BIF
+ that disables GC while trapping (sush as binary_to_list,
+ list_to_binary, binary_to_term, term_to_binary).</p>
+ <p>
+ Own Id: OTP-12231</p>
+ </item>
+ <item>
+ <p>
+ Fix bug when a migrated empty memory carrier is reused
+ just before it should be destroyed by the thread that
+ created it.</p>
+ <p>
+ Own Id: OTP-12249</p>
+ </item>
+ <item>
+ <p>
+ Prevents compile-time errors in NIFs, when the compiler
+ is instructed to treat missing field initializers as
+ errors, by adding an initializer for the new options
+ field which was added to ErlNifEntry for 17.3.</p>
+ <p>
+ Own Id: OTP-12266</p>
+ </item>
+ <item>
+ <p>
+ Fixed CPU topology detection on FreeBSD systems where
+ Erlang/OTP is compiled by new C compilers (including, but
+ possibly not limited to, gcc 4.9 and clang).</p>
+ <p>
+ Own Id: OTP-12267</p>
+ </item>
+ <item>
+ <p>
+ Use C99 function isfinite() instead of finite() when
+ available on non GCC compilers.</p>
+ <p>
+ Own Id: OTP-12268</p>
+ </item>
+ <item>
+ <p>
+ Fix bug on windows where an incorrect number of links
+ could be returned when doing file:read_file_info on a
+ directory.</p>
+ <p>
+ Own Id: OTP-12269</p>
+ </item>
+ <item>
+ <p>
+ Fix rare bug when purging module on VM started with
+ +Meamin.</p>
+ <p>
+ Own Id: OTP-12273</p>
+ </item>
+ <item>
+ <p>
+ Repair run_erl terminal window size adjustment sent from
+ to_erl. This was broken in OTP 17.0 which could lead to
+ strange cursor behaviour in the to_erl shell.</p>
+ <p>
+ Own Id: OTP-12275 Aux Id: seq12739 </p>
+ </item>
+ <item>
+ <p>
+ Fixed bug on windows causing gen_tcp/udp to return an
+ error when given an fd to work with.</p>
+ <p>
+ Own Id: OTP-12289</p>
+ </item>
+ <item>
+ <p>
+ Fix various internal erts issues where negating a signed
+ integer in C would trigger undefined behavior. This fixes
+ issues when dividing with bignums and list_to_integer.</p>
+ <p>
+ Own Id: OTP-12290</p>
+ </item>
+ <item>
+ <p>
+ When flushing output to stdout on windows, the emulator
+ could sometimes hang indefinitely waiting for the flush
+ to complete. This has been fixed.</p>
+ <p>
+ Own Id: OTP-12291</p>
+ </item>
+ <item>
+ <p>
+ Fix so that non-smp emulators with dirty scheduler
+ support shows the correct number of dirty schedulers when
+ calling erlang:system_info(system_version).</p>
+ <p>
+ Own Id: OTP-12295</p>
+ </item>
+ <item>
+ <p>
+ Add <c>nif_version</c> to <c>erlang:system_info/1</c> in
+ order to get the NIF API version of the runtime system in
+ a way similar to <c>driver_version</c>.</p>
+ <p>
+ Own Id: OTP-12298</p>
+ </item>
+ <item>
+ <p>
+ Fix bug that could cause the return value from dirty NIF
+ with zero arity to be treated as garbage, leading to VM
+ crash.</p>
+ <p>
+ Own Id: OTP-12300</p>
+ </item>
+ <item>
+ <p>
+ Improve allocation carrier migration search logic. This
+ will reduce the risk of failed migrations that could lead
+ to excess memory consumption. It will also improve smp
+ performance due to reduced memory contention on the
+ migration pool.</p>
+ <p>
+ Own Id: OTP-12323</p>
+ </item>
+ </list>
+ </section>
+
+
+ <section><title>Improvements and New Features</title>
+ <list>
+ <item>
+ <p>Introduced support for eager check I/O.</p>
+ <p>By default eager check I/O will be disabled, but this
+ will most likely be changed in OTP 18. When eager check
+ I/O is enabled, schedulers will more frequently check for
+ I/O work. Outstanding I/O operations will however not be
+ prioritized to the same extent as when eager check I/O is
+ disabled.</p>
+ <p>Eager check I/O can be enabled using the <c>erl</c>
+ command line argument: <seealso
+ marker="erl#+secio"><c>+secio true</c></seealso></p>
+ <p>Characteristics impact when enabled:</p> <list>
+ <item>Lower latency and smoother management of externally
+ triggered I/O operations.</item> <item>A slightly reduced
+ priority of externally triggered I/O operations.</item>
+ </list>
+ <p>
+ Own Id: OTP-12117</p>
+ </item>
+ <item>
+ <p>
+ Fix erts .app-file</p>
+ <p>
+ Own Id: OTP-12189</p>
+ </item>
+ <item>
+ <p>
+ Add configure option --with-ssl-incl=PATH to support
+ OpenSSL installations with headers and libraries at
+ different places.</p>
+ <p>
+ Own Id: OTP-12215 Aux Id: seq12700 </p>
+ </item>
+ <item>
+ <p>
+ Optimization of atomic memory operations with release
+ barrier semantics on 32-bit PowerPC when using the
+ implementation included in OTP.</p>
+ <p>
+ Own Id: OTP-12250</p>
+ </item>
+ <item>
+ <p>
+ Minor adjustment of scheduler activation code making sure
+ that an activation of a scheduler is not prevented by its
+ run-queue being non-empty. (Thanks to Songlu Cai)</p>
+ <p>
+ Own Id: OTP-12287</p>
+ </item>
+ <item>
+ <p>
+ Improved support for atomic memory operations provided by
+ the <url
+ href="https://github.com/ivmai/libatomic_ops/">libatomic_ops</url>
+ library. Most importantly support for use of native
+ double word atomics when implemented by
+ <c>libatomic_ops</c> (for example, implemented for ARM).</p>
+ <p>
+ The <seealso
+ marker="doc/installation_guide:INSTALL#Advanced-configuration-and-build-of-ErlangOTP_Configuring_Atomic-Memory-Operations-and-the-VM"><c>$ERL_TOP/HOWTO/INSTALL.md</c></seealso>
+ document now also more clearly describes when you want to
+ build together with a <c>libatomic_ops</c> installation.</p>
+ <p>
+ Own Id: OTP-12302</p>
+ </item>
+ <item>
+ <p>
+ Add configure option --with-ssl-rpath to control which
+ runtime library path to use for dynamic linkage toward
+ OpenSSL.</p>
+ <p>
+ Own Id: OTP-12316 Aux Id: seq12753 </p>
+ </item>
+ <item>
+ <p>
+ Added systemd notify support to epmd</p>
+ <p>
+ Own Id: OTP-12321</p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
+<section><title>Erts 6.2.1</title>
+
+ <section><title>Fixed Bugs and Malfunctions</title>
+ <list>
+ <item>
+ <p>
+ Fix bug when an migrated empty memory carrier is reused
+ just before it should be destroyed by the thread that
+ created it.</p>
+ <p>
+ Own Id: OTP-12249</p>
+ </item>
+ <item>
+ <p>
+ Repair run_erl terminal window size adjustment sent from
+ to_erl. This was broken in OTP 17.0 which could lead to
+ strange cursor behaviour in the to_erl shell.</p>
+ <p>
+ Own Id: OTP-12275 Aux Id: seq12739 </p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
+<section><title>Erts 6.2</title>
+
+ <section><title>Fixed Bugs and Malfunctions</title>
+ <list>
+ <item>
+ <p>
+ General documentation updates.</p>
+ <p>
+ Own Id: OTP-12052</p>
+ </item>
+ <item>
+ <p>A bug in the VM code implementing sending of signals
+ to ports could cause the receiving port queue to remain
+ in a busy state forever. When this state had been
+ reached, processes sending command signals to the port
+ either got suspended forever, or, if the <c>nosuspend</c>
+ feature was used, always failed to send to the port. This
+ bug was introduced in ERTS version 5.10.</p>
+ <p>In order for this bug to be triggered on a port, one
+ had to at least once utilize the <c>nosuspend</c>
+ functionality when passing a signal to the port. This by
+ either calling</p> <list> <item> <seealso
+ marker="erlang#port_command/3"><c>port_command(Port,
+ Data, [nosuspend | Options])</c></seealso>, </item>
+ <item> <seealso
+ marker="erlang#send/3"><c>erlang:send(Port, {PortOwner,
+ {command, Data}}, [nosuspend | Options])</c></seealso>,
+ </item> <item> <seealso
+ marker="erlang#send_nosuspend/2"><c>erlang:send_nosuspend(Port,
+ {PortOwner, {command, Data}})</c></seealso>, or </item>
+ <item> <seealso
+ marker="erlang#send_nosuspend/3"><c>erlang:send_nosuspend(Port,
+ {PortOwner, {command, Data}}, Options)</c></seealso>.
+ </item> </list>
+ <p>Thanks Vasily Demidenok for reporting the issue, and
+ Sergey Kudryashov for providing a testcase.</p>
+ <p>
+ Own Id: OTP-12082 Aux Id: OTP-10336 </p>
+ </item>
+ <item>
+ <p>
+ Fix size overflow bug at memory allocation. A memory
+ allocation call, with an insane size close to the entire
+ address space, could return successfully as if it had
+ allocated just a few bytes. (Thanks to Don A. Bailey for
+ reporting)</p>
+ <p>
+ Own Id: OTP-12091</p>
+ </item>
+ <item>
+ <p>
+ Fix various issues where negating a signed integer would
+ trigger undefined behaviour. This fixes issues in the
+ enif_make_int64 interface and some edge cases inside the
+ erlang runtime system.</p>
+ <p>
+ Own Id: OTP-12097</p>
+ </item>
+ <item>
+ <p>
+ The documentation erroneously listed the <seealso
+ marker="erl#+swct"><c>+swct</c></seealso> command line
+ argument under <c>+sws</c>.</p>
+ <p>
+ Own Id: OTP-12102 Aux Id: OTP-10994 </p>
+ </item>
+ <item>
+ <p>
+ Profiling messages could be delivered out of order when
+ profiling on <c>runnable_procs</c> and/or
+ <c>runnable_ports</c> using <seealso
+ marker="erlang#system_profile/2"><c>erlang:system_profile/2</c></seealso>.
+ This bug was introduced in ERTS version 5.10.</p>
+ <p>
+ Own Id: OTP-12105 Aux Id: OTP-10336 </p>
+ </item>
+ <item>
+ <p>
+ Various logging fixes, including: Add run queue index to
+ the process dump in crash dumps.<br/> Add thread index to
+ enomem slogan when crashing.<br/> Remove error logger
+ message for sending messages to old instances of the same
+ node.</p>
+ <p>
+ Own Id: OTP-12115</p>
+ </item>
+ <item>
+ <p>
+ Fix compiler warnings reported by LLVM</p>
+ <p>
+ Own Id: OTP-12138</p>
+ </item>
+ <item>
+ <p>
+ Correct conversion of <c>MIN_SMALL</c> by
+ <c>list_to_integer/1</c> and <c>binary_to_integer/1</c>.
+ The bug produced an unnormalized bignum which can cause
+ strange behavior such as comparing different to a correct
+ <c>MIN_SMALL</c> integer. The value <c>MIN_SMALL</c> is
+ <c>-(1 bsl 27) = -134217728</c> on a 32-bit VM and <c>-(1
+ bsl 59) = -576460752303423488</c> on a 64-bit VM. (Thanks
+ to Jesper Louis Andersen, Mikael Pettersson and Anthony
+ Ramine for report, patch and optimization suggestion)</p>
+ <p>
+ Own Id: OTP-12140</p>
+ </item>
+ <item>
+ <p>
+ Fix bug in <c>term_to_binary</c> that reallocates binary
+ with inconsistent size information. Bug has never been
+ confirmed to be the cause of any faulty behavior.</p>
+ <p>
+ Own Id: OTP-12141</p>
+ </item>
+ <item>
+ <p>
+ Real_path method used while prim loading archive files
+ was not taking into account the fact that windows
+ directory symlinks can be across different drives.</p>
+ <p>
+ Own Id: OTP-12155</p>
+ </item>
+ </list>
+ </section>
+
+
+ <section><title>Improvements and New Features</title>
+ <list>
+ <item>
+ <p>
+ Add log2 histogram to lcnt for lock wait time</p>
+ <p>
+ Own Id: OTP-12059</p>
+ </item>
+ <item>
+ <p>
+ Introduced <seealso
+ marker="erl_nif#enif_schedule_nif"><c>enif_schedule_nif()</c></seealso>
+ to the NIF API.</p>
+ <p>
+ The <c>enif_schedule_nif()</c> function allows a
+ long-running NIF to be broken into separate NIF
+ invocations without the help of a wrapper function
+ written in Erlang. The NIF first executes part of the
+ long-running task, then calls <c>enif_schedule_nif()</c>
+ to schedule a NIF for later execution to continue the
+ task. Any number of NIFs can be scheduled in this manner,
+ one after another. Since the emulator regains control
+ between invocations, this helps avoid problems caused by
+ native code tying up scheduler threads for too long.</p>
+ <p>
+ The <c>enif_schedule_nif()</c> function also replaces the
+ <c>enif_schedule_dirty_nif()</c> in the experimental
+ dirty NIF API. Note that the only incompatible changes
+ made are in the experimental dirty NIF API.</p>
+ <p>
+ See the <seealso marker="erl_nif">NIF
+ documentation</seealso> for more information.</p>
+ <p>
+ Thanks to Steve Vinoski.</p>
+ <p>
+ *** POTENTIAL INCOMPATIBILITY ***</p>
+ <p>
+ Own Id: OTP-12128</p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
+<section><title>Erts 6.1.2</title>
+
+ <section><title>Fixed Bugs and Malfunctions</title>
+ <list>
+ <item>
+ <p>
+ OTP-11850 fixed filelib:wildcard/1 to work with broken
+ symlinks. This correction, however, introduced problems
+ since symlinks were no longer followed for functions like
+ filelib:ensure_dir/1, filelib:is_dir/1,
+ filelib:file_size/1, etc. This is now corrected.</p>
+ <p>
+ Own Id: OTP-12054 Aux Id: seq12660 </p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
+<section><title>Erts 6.1.1</title>
+
+ <section><title>Fixed Bugs and Malfunctions</title>
+ <list>
+ <item>
+ <p>
+ Fixed ETHR_FORCE_INLINE which caused the build to break
+ on some platforms without adequate thread support
+ (VxWorks).</p>
+ <p>
+ Own Id: OTP-12010</p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
+<section><title>Erts 6.1</title>
+
+ <section><title>Fixed Bugs and Malfunctions</title>
+ <list>
+ <item>
+ <p>The documentation for <c>spawn_opt/5</c> now has a
+ note mentioning that the <c>monitor</c> option is not
+ supported.</p>
+ <p>
+ Own Id: OTP-11849</p>
+ </item>
+ <item>
+ <p>
+ Fix broken system monitoring of <c>large_heap</c> for
+ non-smp VM. No message for <c>large_heap</c> was ever
+ sent on non-smp VM. Bug exist since R16B.</p>
+ <p>
+ Own Id: OTP-11852</p>
+ </item>
+ <item>
+ <p>
+ The emulator without SMP support crashed when passing a
+ message to a process without enough heap space for the
+ message. This bug was introduced in <c>erts-6.0</c>.</p>
+ <p>
+ Own Id: OTP-11887 Aux Id: OTP-11388 </p>
+ </item>
+ <item>
+ <p>
+ Fix race between ETS table deletion and unfixation that
+ could cause VM crash. The race could happen between a
+ terminating process that does not own the table but has a
+ fixation on it and another process that deletes the table
+ (maybe the owner terminating) at the same time. Bug
+ existed since R15B02.</p>
+ <p>
+ Own Id: OTP-11892</p>
+ </item>
+ <item>
+ <p>The string following the <c>-eval</c> option when
+ invoking <c>erl</c> would not be properly translated from
+ UTF-8 to a list of Unicode characters (as would the
+ arguments for <c>-run</c>).</p>
+ <p>That bug would cause the build of Erlang/OTP to fail
+ when building in a directory whose pathname contained
+ non-US ASCII characters encoded in UTF-8. (Thanks to Eric
+ Pailleau for reporting this bug.)</p>
+ <p>
+ Own Id: OTP-11916</p>
+ </item>
+ <item>
+ <p>
+ Fix erts_debug:size/1 to handle Map sizes</p>
+ <p>
+ Own Id: OTP-11923</p>
+ </item>
+ <item>
+ <p>
+ Removed <c>erlang:bitstr_to_list/1</c> and
+ <c>erlang:list_to_bitstr/1</c>. They were added by
+ mistake, and have always raised an <c>undefined</c>
+ exception when called.</p>
+ <p>
+ Own Id: OTP-11942</p>
+ </item>
+ <item>
+ <p>
+ Fixed compilation using mingw-w64 on Windows.</p>
+ <p>
+ Thanks to Jani Hakala.</p>
+ <p>
+ Own Id: OTP-11945</p>
+ </item>
+ <item>
+ <p>
+ The git sha is no longer printed in the shell start
+ header when erlang is built from a tagged git release.</p>
+ <p>
+ Own Id: OTP-11961</p>
+ </item>
+ <item>
+ <p>
+ Fixed a bug where <c>send</c> trace events were
+ erroneously dropped when the send was done to a
+ registered process. This bug was introduced in R16B.</p>
+ <p>
+ Own Id: OTP-11968</p>
+ </item>
+ </list>
+ </section>
+
+
+ <section><title>Improvements and New Features</title>
+ <list>
+ <item>
+ <p>The following native functions now bump an appropriate
+ amount of reductions and yield when out of
+ reductions:</p> <list>
+ <item><c>erlang:binary_to_list/1</c></item>
+ <item><c>erlang:binary_to_list/3</c></item>
+ <item><c>erlang:bitstring_to_list/1</c></item>
+ <item><c>erlang:list_to_binary/1</c></item>
+ <item><c>erlang:iolist_to_binary/1</c></item>
+ <item><c>erlang:list_to_bitstring/1</c></item>
+ <item><c>binary:list_to_bin/1</c></item> </list>
+ <p>Characteristics impact:</p> <taglist>
+ <tag>Performance</tag> <item>The functions converting
+ from lists got a performance loss for very small lists,
+ and a performance gain for very large lists.</item>
+ <tag>Priority</tag> <item>Previously a process executing
+ one of these functions effectively got an unfair priority
+ boost. This priority boost depended on the input size.
+ The larger the input was, the larger the priority boost
+ got. This unfair priority boost is now lost. </item>
+ </taglist>
+ <p>
+ Own Id: OTP-11888</p>
+ </item>
+ <item>
+ <p>
+ The systemd features of epmd have been removed from epmd
+ by default. To enable them you have to build erlang with
+ the configure option --enable-systemd.</p>
+ <p>
+ Own Id: OTP-11921</p>
+ </item>
+ <item>
+ <p>
+ Removed Erlang wrapper code used when calling
+ <c>binary_to_term/1</c>, and <c>binary_to_term/2</c>.
+ This improves the performance of these BIFs especially
+ when they are called with small binaries as input.</p>
+ <p>
+ Own Id: OTP-11931</p>
+ </item>
+ <item>
+ <p>
+ Add erlang:system_info(tolerant_timeofday), an API to
+ check whether compensation for sudden changes of system
+ time is enabled or not.</p>
+ <p>
+ Own Id: OTP-11970</p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
+<section><title>Erts 6.0.1</title>
+
+ <section><title>Fixed Bugs and Malfunctions</title>
+ <list>
+ <item>
+ <p>
+ Fix broken system monitoring of <c>large_heap</c> for
+ non-smp VM. No message for <c>large_heap</c> was ever
+ sent on non-smp VM. Bug exist since R16B.</p>
+ <p>
+ Own Id: OTP-11852</p>
+ </item>
+ <item>
+ <p>
+ Fixed type spec of <c>erlang:system_info/1</c>.</p>
+ <p>
+ Own Id: OTP-11859 Aux Id: OTP-11615 </p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
+<section><title>Erts 6.0</title>
+
+ <section><title>Fixed Bugs and Malfunctions</title>
+ <list>
+ <item>
+ <p>
+ The option dupnames did not work as intended in re. When
+ looking for names with {capture, [Name, ...]}, re:run
+ returned a random instance of the match for that name,
+ instead of the leftmost matching instance, which was what
+ the documentation stated. This is now corrected to adhere
+ to the documentation. The option {capture,all_names}
+ along with a re:inspect/2 function is also added to
+ further help in using named subpatterns.</p>
+ <p>
+ Own Id: OTP-11205</p>
+ </item>
+ <item>
+ <p>
+ Allow loading of NIF library with unicode path name</p>
+ <p>
+ Own Id: OTP-11408</p>
+ </item>
+ <item>
+ <p>
+ Allow loading of driver with unicode path name</p>
+ <p>
+ Own Id: OTP-11549</p>
+ </item>
+ <item>
+ <p>
+ Fixed a bug where starting Erlang without having an open
+ stdin on fd 0 would sometimes deadlock the emulator when
+ terminating.</p>
+ <p>
+ Own Id: OTP-11558</p>
+ </item>
+ <item>
+ <p>
+ The option '-names' in epmd now works on Windows (Thanks
+ to Johannes Weißl)</p>
+ <p>
+ Own Id: OTP-11565</p>
+ </item>
+ <item>
+ <p>
+ Correction of the examples in escript documentation.
+ (Thanks to Pierre Fenoll).</p>
+ <p>
+ Own Id: OTP-11577</p>
+ </item>
+ <item>
+ <p>
+ Fix bs_get_integer instruction</p>
+ <p>
+ The instruction bs_get_integer could unnecessarily
+ trigger a garbage collection in failure cases which is
+ unwanted or outright dangerous.</p>
+ <p>
+ Ex:</p>
+ <p>
+ &lt;&lt;X:Sz,_/bits&gt;&gt; = &lt;&lt;"some
+ binary"&gt;&gt;</p>
+ <p>
+ Previously, if Sz induced X to a bignum it would reserved
+ memory size this on the heap via a garbage collection
+ before checking if the size could actually match.</p>
+ <p>
+ It will now check the binary size before triggering a
+ collection.</p>
+ <p>
+ Own Id: OTP-11581</p>
+ </item>
+ <item>
+ <p>
+ Remove heap space overestimation in <c>binary_to_term</c>
+ (and remote message reception) for integers in the
+ intervals [-2147483648,-1] and [256,2147483647] on 64-bit
+ emulators.</p>
+ <p>
+ Own Id: OTP-11585</p>
+ </item>
+ <item>
+ <p>
+ Add support for detecting the separate tinfo library from
+ ncurses (Thanks to Dirkjan Ochtman)</p>
+ <p>
+ Own Id: OTP-11590</p>
+ </item>
+ <item>
+ <p>
+ Deprecation warning for system_flag(cpu_topology) has
+ been extended for removal in OTP 18 (Thanks to Steve
+ Vinoski for the update)</p>
+ <p>
+ Own Id: OTP-11602</p>
+ </item>
+ <item>
+ <p>
+ Documentation improvement regarding some awkward wording
+ around the +spp flag. (Thanks to Brian L. Troutwine )</p>
+ <p>
+ Own Id: OTP-11607</p>
+ </item>
+ <item>
+ <p>
+ Fixed bug where sendfile would return the wrong error
+ code for a remotely closed socket if the socket was in
+ passive mode. (Thanks to Vincent Siliakus for reporting
+ the bug.)</p>
+ <p>
+ Own Id: OTP-11614</p>
+ </item>
+ <item>
+ <p>
+ Increase garbage collection tenure rate</p>
+ <p>The garbage collector tries to maintain the previous
+ heap block size during a minor gc, i.e. 'need' is not
+ utilized in determining the size of the new heap, instead
+ it relies on tenure and garbage to be sufficiently
+ large.</p>
+ <p>In instances during intense growing with exclusively
+ live data on the heap coupled with delayed tenure,
+ fullsweeps would be triggered directly after a minor gc
+ to make room for 'need' since the new heap would be
+ full.</p>
+ <p>To remedy this, the tenure of terms on the minor heap
+ will always happen (if it is below the high watermark)
+ instead of every other minor gc.</p>
+ <p>Characteristics Impact: Reduced CPU-time spent in
+ garbage collection but may infer delays in collecting
+ garbage from the heap. Tweak 'fullsweep_after' options to
+ increase gc pressure if needed.</p>
+ <p>
+ Own Id: OTP-11617</p>
+ </item>
+ <item>
+ <p>
+ Fix bug when comparing integers with floats larger than
+ 2^992. The bug could potentially cause memory corruption
+ on 32-bit emulators.</p>
+ <p>
+ Own Id: OTP-11618</p>
+ </item>
+ <item>
+ <p>
+ Cross-compilation fixes for TileraMDE-3.0.1.125620</p>
+ <p>
+ Own Id: OTP-11635</p>
+ </item>
+ <item>
+ <p>
+ sendfile no longer uses async threads by default</p>
+ <p>
+ This has been done because a slow client attack is
+ possible if the async thread pool is used. The scenario
+ is:</p>
+ <p>
+ Client does a request for a file and then slowly receives
+ the file one byte at a time. This will eventually fill
+ the async thread pool with blocking sendfile operations
+ and thus starving the vm of all file operations.</p>
+ <p>
+ If you still want to use the async threads pool for
+ sendfile an option to enable it has been introduced.</p>
+ <p>
+ Thanks to Christopher Faulet for identifying this
+ vulnerability.</p>
+ <p>
+ *** POTENTIAL INCOMPATIBILITY ***</p>
+ <p>
+ Own Id: OTP-11639</p>
+ </item>
+ <item>
+ <p>
+ Do proper rollback of calls to
+ <c>enif_open_resource_type</c> when load/upgrade
+ callbacks of NIF library return failure.</p>
+ <p>
+ Own Id: OTP-11722</p>
+ </item>
+ <item>
+ <p>
+ Changed the default configuration when configuring with
+ <c>$ERL_TOP/configure</c> to be the same as when
+ configuring with <c>$ERL_TOP/otp_build configure</c>.</p>
+ <p>
+ Previously floating point exceptions got enabled by
+ default on Linux when HiPE was enabled when configuring
+ with <c>$ERL_TOP/configure</c>, but not when configuring
+ with <c>$ERL_TOP/otp_build configure</c>. The default is
+ now in both cases not to use floating point exceptions
+ since there still exist unresolved issues with floating
+ point exceptions on Linux.</p>
+ <p>
+ For more information see <seealso
+ marker="doc/installation_guide:INSTALL"><c>$ERL_TOP/HOWTO/INSTALL.md</c></seealso>.</p>
+ <p>
+ *** POTENTIAL INCOMPATIBILITY ***</p>
+ <p>
+ Own Id: OTP-11723</p>
+ </item>
+ <item>
+ <p>
+ A comment in erl_db_tree.c no longer differ from the
+ code. (Thanks to Cobus Carstens)</p>
+ <p>
+ Own Id: OTP-11793</p>
+ </item>
+ <item>
+ <p>
+ Fix epmd debug functionality for VxWorks (Thanks to Jay
+ True)</p>
+ <p>
+ Own Id: OTP-11808</p>
+ </item>
+ <item>
+ <p>
+ Use closefrom/2 when available in child_setup (Thanks to
+ Rick Reed and Anthony Ramine)</p>
+ <p>
+ Own Id: OTP-11809</p>
+ </item>
+ <item>
+ <p>
+ Fix dtrace/systemtap bug where the probe arguments would
+ be concatenated due to faulty length calculation. </p>
+ <p>
+ Thanks to Michal Ptaszek and Scott Lystig Fritchie</p>
+ <p>
+ Own Id: OTP-11816</p>
+ </item>
+ <item>
+ <p>
+ It is now better documented that the <c>+fn*</c> flags to
+ <c>erl</c> also affect how command line parameters and
+ environment variables are read. (Thanks to Vlad
+ Dumitrescu)</p>
+ <p>
+ Own Id: OTP-11818</p>
+ </item>
+ </list>
+ </section>
+
+
+ <section><title>Improvements and New Features</title>
+ <list>
+ <item>
+ <p>
+ Options to set match_limit and match_limit_recursion are
+ added to re:run. The option report_errors is also added
+ to get more information when re:run fails due to limits
+ or compilation errors.</p>
+ <p>
+ Own Id: OTP-10285</p>
+ </item>
+ <item>
+ <p> Dialyzer's <c>unmatched_return</c> warnings have been
+ corrected. </p>
+ <p>
+ Own Id: OTP-10908</p>
+ </item>
+ <item>
+ <p>
+ A common case is to wrap an argument to
+ <c>list_to_binary/1</c> in a list to ensure conversion
+ can happen even though the argument may already be a
+ binary. Take special care of this case and do not copy
+ binary.</p>
+ <p>
+ Impact: May cause incompatibility since a single binary
+ is no longer copied. Use <c>binary:copy/1,2</c> instead.</p>
+ <p>
+ *** POTENTIAL INCOMPATIBILITY ***</p>
+ <p>
+ Own Id: OTP-11082</p>
+ </item>
+ <item>
+ <p>
+ Make erlang:open_port/2 spawn and spawn_executable handle
+ unicode.</p>
+ <p>
+ Own Id: OTP-11105</p>
+ </item>
+ <item>
+ <p>
+ Handle unicode (widestring) in erl, erlc, heart, etc on
+ windows.</p>
+ <p>
+ Own Id: OTP-11135</p>
+ </item>
+ <item>
+ <p>
+ The version of the PCRE library Used by Erlang's re
+ module is raised to 8.33 from 7.6. This means, among
+ other things, better Unicode and Unicode Character
+ Properties support. New options connected to PCRE 8.33
+ are also added to the re module (ucd, notempty_atstart,
+ no_start_optimize). PCRE has extended the regular
+ expression syntax between 7.6 and 8.33, why this imposes
+ a potential incompatibility. Only very complicated
+ regular expressions may be affected, but if you know you
+ are using obscure features, please test run your regular
+ expressions and verify that their behavior has not
+ changed.</p>
+ <p>
+ *** POTENTIAL INCOMPATIBILITY ***</p>
+ <p>
+ Own Id: OTP-11204</p>
+ </item>
+ <item>
+ <p>Filenames containing UTF-8 encoded characters can now
+ be handled by erlc.</p>
+ <p>If you have set the <c>ERLC_EMULATOR</c> environment
+ variable, note that <c>erlc</c> in OTP 17 will only work
+ with <c>erl</c> in OTP 17 since the protocol between the
+ <c>erlc</c> program and the <c>erl_compile</c> module has
+ changed.</p>
+ <p>
+ Own Id: OTP-11248</p>
+ </item>
+ <item>
+ <p>
+ By giving --enable-static-{nifs,drivers} to configure it
+ is now possible to statically linking of nifs and drivers
+ to the main Erlang VM binary. At the moment only the asn1
+ and crypto nifs of the Erlang/OTP nifs and drivers have
+ been prepared to be statically linked. For more details
+ see the Installation Guide in the System documentation.</p>
+ <p>
+ Own Id: OTP-11258</p>
+ </item>
+ <item>
+ <p>
+ Erlang/OTP has been ported to the realtime operating
+ system OSE. The port supports both smp and non-smp
+ emulator. For details around the port and how to started
+ see the User's Guide in the <seealso
+ marker="ose:ose_intro">ose</seealso> application. </p>
+ <p>
+ Note that not all parts of Erlang/OTP has been ported. </p>
+ <p>
+ Notable things that work are: non-smp and smp emulators,
+ OSE signal interaction, crypto, asn1, run_erl/to_erl,
+ tcp, epmd, distribution and most if not all non-os
+ specific functionality of Erlang.</p>
+ <p>
+ Notable things that does not work are: udp/sctp, os_mon,
+ erl_interface, binding of schedulers.</p>
+ <p>
+ Own Id: OTP-11334</p>
+ </item>
+ <item>
+ <p>
+ Add the {active,N} socket option for TCP, UDP, and SCTP,
+ where N is an integer in the range -32768..32767, to
+ allow a caller to specify the number of data messages to
+ be delivered to the controlling process. Once the
+ socket's delivered message count either reaches 0 or is
+ explicitly set to 0 with inet:setopts/2 or by including
+ {active,0} as an option when the socket is created, the
+ socket transitions to passive ({active, false}) mode and
+ the socket's controlling process receives a message to
+ inform it of the transition. TCP sockets receive
+ {tcp_passive,Socket}, UDP sockets receive
+ {udp_passive,Socket} and SCTP sockets receive
+ {sctp_passive,Socket}. </p>
+ <p>
+ The socket's delivered message counter defaults to 0, but
+ it can be set using {active,N} via any gen_tcp, gen_udp,
+ or gen_sctp function that takes socket options as
+ arguments, or via inet:setopts/2. New N values are added
+ to the socket's current counter value, and negative
+ numbers can be used to reduce the counter value.
+ Specifying a number that would cause the socket's counter
+ value to go above 32767 causes an einval error. If a
+ negative number is specified such that the counter value
+ would become negative, the socket's counter value is set
+ to 0 and the socket transitions to passive mode. If the
+ counter value is already 0 and inet:setopts(Socket,
+ [{active,0}]) is specified, the counter value remains at
+ 0 but the appropriate passive mode transition message is
+ generated for the socket.</p>
+ <p>
+ Thanks to Steve Vinoski</p>
+ <p>
+ Own Id: OTP-11368</p>
+ </item>
+ <item>
+ <p>
+ A new optional scheduler utilization balancing mechanism
+ has been introduced. For more information see the
+ <seealso marker="erl#+sub"><c>+sub</c></seealso> command
+ line argument.</p>
+ <p>
+ Characteristics impact: None, when not enabled. When
+ enabled, changed timing in the system, normally a small
+ overhead due to measuring of utilization and calculating
+ balancing information. On some systems, such as old
+ Windows systems, the overhead can be quite substantial.
+ This time measurement overhead highly depend on the
+ underlying primitives provided by the OS.</p>
+ <p>
+ Own Id: OTP-11385</p>
+ </item>
+ <item>
+ <p>
+ A call to either the <c>garbage_collect/1</c> BIF or the
+ <c>check_process_code/2</c> BIF may trigger garbage
+ collection of another processes than the process calling
+ the BIF. The previous implementations performed these
+ kinds of garbage collections without considering the
+ internal state of the process being garbage collected. In
+ order to be able to more easily and more efficiently
+ implement yielding native code, these types of garbage
+ collections have been rewritten. A garbage collection
+ like this is now triggered by an asynchronous request
+ signal, the actual garbage collection is performed by the
+ process being garbage collected itself, and finalized by
+ a reply signal to the process issuing the request. Using
+ this approach processes can disable garbage collection
+ and yield without having to set up the heap in a state
+ that can be garbage collected.</p>
+ <p>
+ The <seealso
+ marker="erts:erlang#garbage_collect/2"><c>garbage_collect/2</c></seealso>,
+ and <seealso
+ marker="erts:erlang#check_process_code/3"><c>check_process_code/3</c></seealso>
+ BIFs have been introduced. Both taking an option list as
+ last argument. Using these, one can issue asynchronous
+ requests.</p>
+ <p>
+ <c>code:purge/1</c> and <c>code:soft_purge/1</c> have
+ been rewritten to utilize asynchronous
+ <c>check_process_code</c> requests in order to
+ parallelize work.</p>
+ <p>
+ Characteristics impact: A call to the
+ <c>garbage_collect/1</c> BIF or the
+ <c>check_process_code/2</c> BIF will normally take longer
+ time to complete while the system as a whole wont be as
+ much negatively effected by the operation as before. A
+ call to <c>code:purge/1</c> and <c>code:soft_purge/1</c>
+ may complete faster or slower depending on the state of
+ the system while the system as a whole wont be as much
+ negatively effected by the operation as before.</p>
+ <p>
+ Own Id: OTP-11388 Aux Id: OTP-11535, OTP-11648 </p>
+ </item>
+ <item>
+ <p>
+ Cleanup 'Buckets' and 'Time left' fields in crashdump to
+ ease parsing.</p>
+ <p>
+ Own Id: OTP-11419</p>
+ </item>
+ <item>
+ <p>
+ Add sync option to file:open/2.</p>
+ <p>
+ The sync option adds the POSIX O_SYNC flag to the open
+ system call on platforms that support the flag or its
+ equivalent, e.g., FILE_FLAG_WRITE_THROUGH on Windows. For
+ platforms that don't support it, file:open/2 returns
+ {error, enotsup} if the sync option is passed in. Thank
+ to Steve Vinoski and Joseph Blomstedt</p>
+ <p>
+ Own Id: OTP-11498</p>
+ </item>
+ <item>
+ <p>
+ erlang:binary_to_term will now cost an appropriate amount
+ of reductions and will interrupt (yield) for reschedule
+ if the term is big. This avoids too long schedules when
+ binary_to_term is used. (Thanks to Svante Karlsson for
+ the original patch)</p>
+ <p>
+ Impact: Programs running binary_to_term on large binaries
+ will run more smoothly, but rescheduling will impact the
+ single process performance of the BIF. Single threaded
+ benchmarks might show degraded performance of the BIF,
+ while general system behaviour will be improved.</p>
+ <p>
+ Own Id: OTP-11535 Aux Id: OTP-11388 </p>
+ </item>
+ <item>
+ <p>
+ Added high resolution icon for windows. (Thanks to Daniel
+ Goertz for the inspiration.)</p>
+ <p>
+ Own Id: OTP-11560</p>
+ </item>
+ <item>
+ <p>
+ Migration of memory carriers has been enabled by default
+ on all ERTS internal memory allocators based on the
+ <seealso
+ marker="erts_alloc#alloc_util"><c>alloc_util</c></seealso>
+ framework except for <c>temp_alloc</c>. That is, <seealso
+ marker="erts_alloc#M_acul"><c>+M&lt;S&gt;acul
+ de</c></seealso> is default for these allocators. Note
+ that this also implies changed allocation strategies for
+ all of these allocators. They will all now use the
+ "address order first fit carrier best fit" strategy.</p>
+ <p>
+ By passing <c>+Muacul 0</c> on the command line, all
+ configuration changes made by this change will be
+ reverted.</p>
+ <p>
+ Characteristics impact: Improved memory characteristics
+ with a smaller memory footprint at the expense of a quite
+ small performance cost.</p>
+ <p>
+ Own Id: OTP-11604 Aux Id: OTP-10279 </p>
+ </item>
+ <item>
+ <p>A clarification has been added to the documentation of
+ <c>-on_load()</c> in the Reference Manual that it is only
+ recommended for loading NIF libraries.</p>
+ <p>
+ Own Id: OTP-11611</p>
+ </item>
+ <item>
+ <p><c>+fnaw</c> is now default when starting the
+ emulator; it used to be <c>+fnl</c>.</p>
+ <p>
+ *** POTENTIAL INCOMPATIBILITY ***</p>
+ <p>
+ Own Id: OTP-11612</p>
+ </item>
+ <item>
+ <p>
+ EEP43: New data type - Maps</p>
+ <p>
+ With Maps you may for instance:</p>
+ <taglist>
+ <tag/> <item><c>M0 = #{ a =&gt; 1, b =&gt; 2}, % create
+ associations</c></item>
+ <tag/><item><c>M1 = M0#{ a := 10 }, % update values</c></item>
+ <tag/><item><c>M2 = M1#{ "hi" =&gt;
+ "hello"}, % add new associations</c></item>
+ <tag/><item><c>#{ "hi" := V1, a := V2, b := V3} = M2.
+ % match keys with values</c></item>
+ </taglist>
+ <p>
+ For information on how to use Maps please see Map Expressions in the
+ <seealso marker="doc/reference_manual:expressions#map_expressions">
+ Reference Manual</seealso>.</p>
+ <p>
+ The current implementation is without the following
+ features:</p>
+ <taglist>
+ <tag/><item>No variable keys</item>
+ <tag/><item>No single value access</item>
+ <tag/><item>No map comprehensions</item>
+ </taglist>
+ <p>
+ Note that Maps is <em>experimental</em> during OTP 17.0.</p>
+ <p>
+ Own Id: OTP-11616</p>
+ </item>
+ <item>
+ <p>
+ The previously deprecated driver API function
+ <c>driver_async_cancel()</c> has been removed. Due to
+ this, the driver API version has been bumped to 3.0.</p>
+ <p>
+ Thanks to Steve Vinoski.</p>
+ <p>
+ *** POTENTIAL INCOMPATIBILITY ***</p>
+ <p>
+ Own Id: OTP-11628</p>
+ </item>
+ <item>
+ <p>
+ Experimental "dirty scheduler" functionality has been
+ introduced. In order to try the functionality out, you
+ need to pass the command line argument
+ <c>--enable-dirty-schedulers</c> to <c>configure</c> when
+ building the system.</p>
+ <p>
+ Dirty schedulers can currently only be used by NIFs on a
+ system with SMP support. More information can be found in
+ the <seealso
+ marker="erl_nif#dirty_nifs"><c>erl_nif(3)</c></seealso>
+ documentation, the <seealso
+ marker="erl"><c>erl(1)</c></seealso> documentation, and
+ in the git commit comment of commit
+ 'c1c03ae4ee50e58b7669ea88ec4d29c6b2b67c7b'.</p>
+ <p>
+ Note that the functionality is <em>experimental</em>, and
+ <em>not supported</em>. This functionality <em>will</em>
+ be subject to backward incompatible changes. You should
+ <em>not</em> enable the dirty scheduler functionality on
+ production systems. It is only provided for testing.</p>
+ <p>
+ Thanks to Steve Vinoski.</p>
+ <p>
+ Own Id: OTP-11629</p>
+ </item>
+ <item>
+ <p>
+ Improve reduction cost and yielding of
+ <c>term_to_binary</c>. The reduction cost is increased
+ and garbage collection is disabled during yield.</p>
+ <p>
+ Impact: Improves system responsiveness when
+ <c>term_to_binary</c> is called with large terms without
+ significant degradation of single threaded performance.</p>
+ <p>
+ Own Id: OTP-11648 Aux Id: OTP-11388 </p>
+ </item>
+ <item>
+ <p>
+ By default, the system's version of zlib will be used,
+ provided its version is 1.2.4 or higher; otherwise the
+ built-in zlib will be used. The built-in version of zlib
+ has been bumped to 1.2.8. (Use the
+ <c>--enable-builtin-zlib</c> option to <c>configure</c>
+ to force the use of the built-in zlib.)</p>
+ <p>
+ Own Id: OTP-11669</p>
+ </item>
+ <item>
+ <p>
+ The default float encoding in binary_to_term and
+ external_size has been changed to use minor_mode 1
+ instead of 0.</p>
+ <p>
+ *** POTENTIAL INCOMPATIBILITY ***</p>
+ <p>
+ Own Id: OTP-11738</p>
+ </item>
+ <item>
+ <p>
+ Introduced the <c>configure</c> option
+ <c>--with-assumed-cache-line-size=SIZE</c>. For more
+ information see <seealso
+ marker="doc/installation_guide:INSTALL"><c>$ERL_TOP/HOWTO/INSTALL.md</c></seealso>.</p>
+ <p>
+ Own Id: OTP-11742</p>
+ </item>
+ <item>
+ <p>
+ Halfword emulator is marked as deprecated. It still works
+ as before but is planned to be removed in a future major
+ release.</p>
+ <p>
+ Own Id: OTP-11777</p>
+ </item>
+ <item>
+ <p>
+ The external format for Maps has changed in a way that is
+ not compatible with the format used in OTP 17.0-rc1 and
+ OTP 17.0-rc2.</p>
+ <p>
+ *** POTENTIAL INCOMPATIBILITY ***</p>
+ <p>
+ Own Id: OTP-11782</p>
+ </item>
+ <item>
+ <p>
+ Fixed faulty make dependency that would make some make
+ versions fail while building gen_git_version.mk.</p>
+ <p>
+ Own Id: OTP-11784</p>
+ </item>
+ <item>
+ <p>
+ Introduced functionality for allowing old drivers and NIF
+ libraries to be loaded during a transition period. For
+ more information see <seealso
+ marker="erts:erl_driver#version_management">the version
+ management section in the <c>erl_driver(3)</c>
+ documentation</seealso> and <seealso
+ marker="erts:erl_nif#version_management">the version
+ management section in the <c>erl_nif(3)</c>
+ documentation</seealso>.</p>
+ <p>
+ Own Id: OTP-11799</p>
+ </item>
+ <item>
+ <p>
+ Support file paths longer than 259 characters on Windows.
+ Long absolute paths are automatically converted to UNC
+ format with a <c>\\?\</c> prefix which is the only way to
+ represent long paths. The 259 character limit still
+ applies for individual file names, relative paths and the
+ current working directory.</p>
+ <p>
+ Own Id: OTP-11813</p>
+ </item>
+ <item>
+ <p>
+ Document that escript:create/2 also accepts a 3-elements
+ tuple containing files and zip:create/3 options to build
+ a zip file.</p>
+ <p>
+ Thanks to Pierre Fenoll</p>
+ <p>
+ Own Id: OTP-11827</p>
+ </item>
+ <item>
+ <p>
+ Add systemd socket activation for epmd.</p>
+ <p>
+ Thanks to Matwey V. Kornilov</p>
+ <p>
+ Own Id: OTP-11829</p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
+<section><title>Erts 5.10.4.1</title>
+
+ <section><title>Known Bugs and Problems</title>
+ <list>
+ <item>
+ <p>
+ When using gen_tcp:connect and the <c>fd</c> option with
+ <c>port</c> and/or <c>ip</c>, the <c>port</c> and
+ <c>ip</c> options were ignored. This has been fixed so
+ that if <c>port</c> and/or <c>ip</c> is specified
+ together with <c>fd</c> a bind is requested for that
+ <c>fd</c>. If <c>port</c> and/or <c>ip</c> is not
+ specified bind will not be called.</p>
+ <p>
+ Own Id: OTP-12061</p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
+<section><title>Erts 5.10.4</title>
+
+ <section><title>Fixed Bugs and Malfunctions</title>
+ <list>
+ <item>
+ <p>
+ When normalizing paths, erl_prim_loader would always
+ convert backslash to forward slash. This is correct on
+ Windows, but not on other operating systems.
+ erl_prim_loader now checks which OS is running before
+ performing this conversion.</p>
+ <p>
+ Own Id: OTP-11170</p>
+ </item>
+ <item>
+ <p>
+ Fixed syslog defines and defined LOG_ERR for systems
+ without syslog.h. Thanks to Matt Lewandowsky.</p>
+ <p>
+ Own Id: OTP-11349</p>
+ </item>
+ <item>
+ <p>
+ Check all pattern arguments passed to binary:matches/2.
+ Thanks to Mike Sassak.</p>
+ <p>
+ Own Id: OTP-11350</p>
+ </item>
+ <item>
+ <p>
+ Fix two small silent rules omissions. Thanks to Anthony
+ Ramine.</p>
+ <p>
+ Own Id: OTP-11351</p>
+ </item>
+ <item>
+ <p>
+ Teach configure to detect if posix_memalign cannot align
+ to more than the system page size. </p>
+ <p>
+ For cross-compiled systems a new environment variable
+ called erl_xcomp_posix_memalign has been introduced to
+ indicate whether posix_memalign should be used.</p>
+ <p>
+ Own Id: OTP-11371</p>
+ </item>
+ <item>
+ <p>
+ Fix bsr bug occurring when shifting a huge number a huge
+ number of bits to the right. Thanks to Lars Hesel
+ Christensen.</p>
+ <p>
+ Own Id: OTP-11381</p>
+ </item>
+ <item>
+ <p>
+ Fix memory leak for distributed monitors</p>
+ <p>
+ Own Id: OTP-11410</p>
+ </item>
+ <item>
+ <p>
+ Fix various typos in erts, kernel and ssh. Thanks to
+ Martin Hässler.</p>
+ <p>
+ Own Id: OTP-11414</p>
+ </item>
+ <item>
+ <p>
+ Crashdumps initiated by out-of-memory on process spawn
+ could cause the beam to segfault during crashdump writing
+ due to invalid pointers.</p>
+ <p>
+ The pointers are invalid since the process creation never
+ finished. This fix removes these processes from the
+ printouts. Reported by Richard Carlsson.</p>
+ <p>
+ Own Id: OTP-11420</p>
+ </item>
+ <item>
+ <p>
+ Crash dumps from 64-bit Erlang machines would have all
+ memory addresses truncated to 32 bits, which could cause
+ trouble inspecting processes message queues and stacks in
+ the crashdump viewer.</p>
+ <p>
+ Own Id: OTP-11450</p>
+ </item>
+ <item>
+ <p>
+ Threads other than schedulers threads could make thread
+ unsafe accesses when support for migration of memory
+ carriers had been enabled, i.e., when the <seealso
+ marker="erts_alloc#M_acul"><c>+M&lt;S&gt;acul</c></seealso>
+ command line flag had been passed to <seealso
+ marker="erl"><c>erl</c></seealso>. This could cause
+ corruption of the VMs internal state.</p>
+ <p>
+ This bug was introduced in erts-5.10.2 when the support
+ for migration of memory carriers was introduced.</p>
+ <p>
+ Own Id: OTP-11456 Aux Id: OTP-10279 </p>
+ </item>
+ <item>
+ <p>
+ Fix bug in <c>binary_to_term</c> for invalid bitstrings
+ and very large binaries (>2Gb).</p>
+ <p>
+ Own Id: OTP-11479</p>
+ </item>
+ <item>
+ <p>
+ Under rare circumstances a process calling <seealso
+ marker="kernel:inet#close/1"><c>inet:close/1</c></seealso>,
+ <seealso
+ marker="kernel:gen_tcp#close/1"><c>gen_tcp:close/1</c></seealso>,
+ <seealso
+ marker="kernel:gen_udp#close/1"><c>gen_udp:close/1</c></seealso>,
+ or <seealso
+ marker="kernel:gen_sctp#close/1"><c>gen_sctp:close/1</c></seealso>
+ could hang in the call indefinitely.</p>
+ <p>
+ Own Id: OTP-11491</p>
+ </item>
+ <item>
+ <p>
+ Fix bug that could cause a 32-bit emulator to always
+ crash at start (since R16B01) depending on the alignment
+ of static data in the beam executable.</p>
+ <p>
+ Own Id: OTP-11496</p>
+ </item>
+ <item>
+ <p>
+ Fix benign bugs regarding bitstring compare. Only a
+ nuisance for debug and valgrind VM.</p>
+ <p>
+ Own Id: OTP-11501</p>
+ </item>
+ <item>
+ <p>
+ Silence warnings (Thanks to Anthony Ramine)</p>
+ <p>
+ Own Id: OTP-11517</p>
+ </item>
+ <item>
+ <p>
+ The default wordsize of the emulator (beam) is now
+ determined by compiler default on Mac OSX (Darwin). This
+ was previously forced to 32bits by the configure script
+ unless otherwise specified.</p>
+ <p>
+ Own Id: OTP-11521</p>
+ </item>
+ </list>
+ </section>
+
+
+ <section><title>Improvements and New Features</title>
+ <list>
+ <item>
+ <p>
+ A new memory allocation feature called "super carrier"
+ has been introduced. The super carrier feature can be
+ used in different ways. It can for example be used for
+ pre-allocation of all memory that the runtime system
+ should be able to use.</p>
+ <p>
+ By default the super carrier is disabled. It is enabled
+ by passing the <seealso
+ marker="erts:erts_alloc#MMscs"><c>+MMscs &lt;size in
+ MB&gt;</c></seealso> command line argument. For more
+ information see the documentation of the <seealso
+ marker="erts:erts_alloc#MMsco"><c>+MMsco</c></seealso>,
+ <seealso
+ marker="erts:erts_alloc#MMscrfsd"><c>+MMscrfsd</c></seealso>,
+ <seealso
+ marker="erts:erts_alloc#MMscrpm"><c>+MMscrpm</c></seealso>,
+ <seealso
+ marker="erts:erts_alloc#MMscs"><c>+MMscs</c></seealso>,
+ <seealso
+ marker="erts:erts_alloc#Musac"><c>+MMusac</c></seealso>,
+ and, <seealso
+ marker="erts:erts_alloc#Mlpm"><c>+Mlpm</c></seealso>
+ command line arguments in the <seealso
+ marker="erts:erts_alloc"><c>erts_alloc(3)</c></seealso>
+ documentation.</p>
+ <p>
+ Since it is disabled by default there should be no impact
+ on system characteristics if not used.</p>
+ <p>
+ This change has been marked as a potential
+ incompatibility since the returned list when calling
+ <seealso
+ marker="erts:erlang#system_info_allocator_tuple"><c>erlang:system_info({allocator,
+ mseg_alloc})</c></seealso> now also include an
+ <c>{erts_mmap, _}</c> tuple as one element in the list.</p>
+ <p>
+ *** POTENTIAL INCOMPATIBILITY ***</p>
+ <p>
+ Own Id: OTP-11149</p>
+ </item>
+ <item>
+ <p>
+ Added erlang:system_info(ets_limit) to provide a way to
+ retrieve the runtime's maximum number of ETS tables.
+ Thanks to Steve Vinoski</p>
+ <p>
+ Own Id: OTP-11362</p>
+ </item>
+ <item>
+ <p>
+ Add new BIF os:unsetenv/1 which deletes an environment
+ variable. Thanks to Martin Hässler.</p>
+ <p>
+ Own Id: OTP-11446</p>
+ </item>
+ <item>
+ <p> Introduced a new guarantee regarding exit signals
+ from ports: </p><p> If the process calling one of the
+ synchronous port BIFs listed below is linked to the port
+ identified by the first argument, and the port exits
+ before sending the result of the port operation, the exit
+ signal issued due to this link will be received by the
+ processes before the BIF returns, or fail with an
+ exception due to the port not being open. </p><p> The
+ synchronous port BIFs are: </p> <list> <item><seealso
+ marker="erlang#port_close/1"><c>port_close/1</c></seealso></item>
+ <item><seealso
+ marker="erlang#port_command/2"><c>port_command/2</c></seealso></item>
+ <item><seealso
+ marker="erlang#port_command/3"><c>port_command/3</c></seealso></item>
+ <item><seealso
+ marker="erlang#port_connect/2"><c>port_connect/2</c></seealso></item>
+ <item><seealso
+ marker="erlang#port_control/3"><c>port_control/3</c></seealso></item>
+ <item><seealso
+ marker="erlang#port_call/3"><c>erlang:port_call/3</c></seealso></item>
+ <item><seealso
+ marker="erlang#port_info/1"><c>erlang:port_info/1</c></seealso></item>
+ <item><seealso
+ marker="erlang#port_info/2"><c>erlang:port_info/2</c></seealso></item>
+ </list> <p> Note that some ports under certain
+ circumstances unlink themselves from the calling process
+ before exiting, i.e. even though the process linked
+ itself to the port there might be no link triggering an
+ exit signal. </p> <p>Characteristics impact: The return
+ or exception from the synchronous port BIF will be
+ delayed if the port simultaneously exit due to some issue
+ unrelated to the outstanding synchronous port BIF call.
+ In all other cases characteristics are unchanged. </p>
+ <p>
+ Own Id: OTP-11489</p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
+<section><title>Erts 5.10.3.1</title>
+
+ <section><title>Improvements and New Features</title>
+ <list>
+ <item>
+ <p>
+ Memory allocators will be able to create <c>sys_alloc</c>
+ carriers as fallback, if <c>mseg_alloc</c> cannot create
+ more carriers, on systems with <c>posix_memalign()</c>
+ support. This is similar to how it worked in pre-R16
+ releases.</p>
+ <p>
+ Windows systems will create carriers using
+ <c>_aligned_malloc()</c> and can by this use the new
+ optimized allocator header scheme introduced in R16 on
+ other platforms.</p>
+ <p>
+ Own Id: OTP-11318</p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
+<section><title>Erts 5.10.3</title>
+
+ <section><title>Fixed Bugs and Malfunctions</title>
+ <list>
+ <item>
+ <p> The documentation of predefined types and built-in
+ types has been corrected. </p>
+ <p>
+ Own Id: OTP-11090</p>
+ </item>
+ <item>
+ <p>
+ Fix changing terminal parameters in to_erl</p>
+ <p>
+ Change the behaviour of to_erl to use TCSADRAIN instead
+ of TCSANOW when changing terminal parameters. This makes
+ the serial driver wait for the output queues to be empty
+ before applying the terminal parameter change. Thanks to
+ Stefan Zegenhagen.</p>
+ <p>
+ Own Id: OTP-11206</p>
+ </item>
+ <item>
+ <p>
+ The default value of {flush, boolean()} in erlang:halt/2
+ is documented to be 'true' if the status is an integer.
+ The implementation behaviour was reversed. The
+ Implementation is now corrected to adhere to the
+ documentation. Thanks to Jose Valim for reporting the
+ error.</p>
+ <p>
+ *** POTENTIAL INCOMPATIBILITY ***</p>
+ <p>
+ Own Id: OTP-11218</p>
+ </item>
+ <item>
+ <p>
+ Fix serious race bug in R16B01 that could cause PID
+ mix-ups when a lot of processes were spawned and
+ terminated in a very rapid pace on an SMP emulator with
+ at least two scheduler threads.</p>
+ <p>
+ Own Id: OTP-11225</p>
+ </item>
+ <item>
+ <p>
+ Validating a trace pattern with the option silent no
+ longer incorrectly enables/disables the silent option of
+ the calling process.</p>
+ <p>
+ Own Id: OTP-11232</p>
+ </item>
+ <item>
+ <p>
+ Fixed a bug where GCC 4.8 and later use a more aggressive
+ loop optimization algorithm that broke some previously
+ working code in the efile driver. Thanks to Tomas
+ Abrahamsson for reporting this issue.</p>
+ <p>
+ Own Id: OTP-11246</p>
+ </item>
+ <item>
+ <p>
+ Fixed bug when printing memory allocator acul option in
+ crash dump.</p>
+ <p>
+ Own Id: OTP-11264</p>
+ </item>
+ <item>
+ <p>
+ Opening a new compressed file on Windows could in rare
+ (random) cases result in {error,eisdir} or other error
+ codes although it should have succeeded. This is now
+ corrected.</p>
+ <p>
+ Own Id: OTP-11265</p>
+ </item>
+ <item>
+ <p>
+ Fixed a race condition when closing a trace port that
+ would cause the emulator to crash.</p>
+ <p>
+ Own Id: OTP-11290</p>
+ </item>
+ </list>
+ </section>
+
+
+ <section><title>Improvements and New Features</title>
+ <list>
+ <item>
+ <p>
+ There is a new somewhat experimental socket option
+ 'netns' that can set the network namespace for a socket
+ on Linux:es where it is supported. See the documentation.</p>
+ <p>
+ Own Id: OTP-11157</p>
+ </item>
+ <item>
+ <p>
+ New allocator strategy <c>aoffcbf</c> (address order
+ first fit carrier best fit). Supports carrier migration
+ but with better CPU performance than <c>aoffcaobf</c>.</p>
+ <p>
+ Own Id: OTP-11174</p>
+ </item>
+ <item>
+ <p>
+ Introduced functionality for inspection of system and
+ build configuration.</p>
+ <p>
+ Own Id: OTP-11196</p>
+ </item>
+ <item>
+ <p>
+ Fix matching of floating point middle-endian machines.
+ Thanks to Johannes Weissl.</p>
+ <p>
+ Own Id: OTP-11201</p>
+ </item>
+ <item>
+ <p>
+ Fix compile error on ARM and GCC versions greater than
+ 4.1.0. Thanks to Johannes Weissl.</p>
+ <p>
+ Own Id: OTP-11214</p>
+ </item>
+ <item>
+ <p>
+ run_erl: Redirect standard streams to /dev/null. Thanks
+ to Johannes Weissl.</p>
+ <p>
+ Own Id: OTP-11215</p>
+ </item>
+ <item>
+ <p>
+ Misc. corrections in documentation for erl_driver. Thanks
+ to Giacomo Olgeni.</p>
+ <p>
+ Own Id: OTP-11227</p>
+ </item>
+ <item>
+ <p>
+ Fix documentation regarding binary_part.</p>
+ <p>
+ Own Id: OTP-11239</p>
+ </item>
+ <item>
+ <p>
+ Make edlin understand a few important control keys.
+ Thanks to Stefan Zegenhagen.</p>
+ <p>
+ Own Id: OTP-11251</p>
+ </item>
+ <item>
+ <p>
+ Export type zlib:zstream/0. Thanks to Loic Hoguin.</p>
+ <p>
+ Own Id: OTP-11278</p>
+ </item>
+ <item>
+ <p>
+ Add erl option to set schedulers by percentages. </p>
+ <p>
+ For applications where measurements show enhanced
+ performance from the use of a non-default number of
+ emulator scheduler threads, having to accurately set the
+ right number of scheduler threads across multiple hosts
+ each with different numbers of logical processors is
+ difficult because the erl +S option requires absolute
+ numbers of scheduler threads and scheduler threads online
+ to be specified.</p>
+ <p>
+ To address this issue, add a +SP option to erl, similar
+ to the existing +S option but allowing the number of
+ scheduler threads and scheduler threads online to be set
+ as percentages of logical processors configured and
+ logical processors available, respectively. For example,
+ "+SP 50:25" sets the number of scheduler threads to 50%
+ of the logical processors configured, and the number of
+ scheduler threads online to 25% of the logical processors
+ available. The +SP option also interacts with any
+ settings specified with the +S option, such that the
+ combination of options "+S 4:4 +SP 50:50" (in either
+ order) results in 2 scheduler threads and 2 scheduler
+ threads online.</p>
+ <p>
+ Thanks to Steve Vinoski</p>
+ <p>
+ Own Id: OTP-11282</p>
+ </item>
+ <item>
+ <p>
+ Extend erl_driver interface with lock names</p>
+ <p>
+ Lock and thread names are already a feature in the driver
+ interface. This extension will let developers read these
+ names which eases debugging.</p>
+ <p>
+ Own Id: OTP-11303</p>
+ </item>
+ <item>
+ <p>
+ Fix incorrect values returned by integer_to_binary/2.
+ Thanks to Juan Jose Comellas.</p>
+ <p>
+ Own Id: OTP-11311</p>
+ </item>
+ <item>
+ <p>
+ Fix system_flag scheduling_statistics - disable . Thanks
+ to Steve Vinoski.</p>
+ <p>
+ Own Id: OTP-11317</p>
+ </item>
+ <item>
+ <p> The documentation of predefined types has been
+ corrected Thanks to Kostis Sagonas. </p>
+ <p>
+ Own Id: OTP-11321</p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
<section><title>Erts 5.10.2</title>
<section><title>Fixed Bugs and Malfunctions</title>
@@ -321,7 +4487,7 @@
<item>
<p>
Support wide characters in the shell through wcwidth().
- Thanks to Anthony Ramine. Reported by Lo�c Hoguin.</p>
+ Thanks to Anthony Ramine. Reported by Loïc Hoguin.</p>
<p>
Own Id: OTP-11088</p>
</item>
@@ -342,7 +4508,7 @@
<item>
<p>
Remove 'query' from the list of reserved words in docs.
- Thanks to Matthias Endler and Lo�c Hoguin.</p>
+ Thanks to Matthias Endler and Loïc Hoguin.</p>
<p>
Own Id: OTP-11158</p>
</item>
@@ -1500,8 +5666,7 @@
<p>
Fix erl_prim_loader errors in handling of primary
archive. The following errors have been corrected:</p>
- <p>
- <list> <item> If primary archive was named "xxx", then a
+ <list> <item> If primary archive was named "xxx", then a
file in the same directory named "xxxyyy" would be
interpreted as a file named "yyy" inside the archive.
</item> <item> erl_prim_loader did not correctly create
@@ -1516,7 +5681,8 @@
erl_prim_loader:list_dir/1 would sometimes return an
empty string inside the file list. This was a virtual
element representing the top directory of the archive.
- This has been removed. </item> </list></p>
+ This has been removed. </item>
+ </list>
<p>
Thanks to Tuncer Ayaz and Shunichi Shinohara for
reporting and co-authoring corrections.</p>
@@ -1961,7 +6127,7 @@
<item>
<p>
Fix typo in supervisor behaviour doc (Thanks to Ricardo
- Catalinas Jim�nez)</p>
+ Catalinas Jiménez)</p>
<p>
Own Id: OTP-9924</p>
</item>
@@ -2225,7 +6391,7 @@
<item>
<p>
Fixes module erlang doc style: option description (Thanks
- to Ricardo Catalinas Jim�nez)</p>
+ to Ricardo Catalinas Jiménez)</p>
<p>
Own Id: OTP-9697</p>
</item>
@@ -2674,7 +6840,7 @@
<item>
<p>
Fix typos in the epmd documentation (Thanks to Holger
- Wei� )</p>
+ Weiß )</p>
<p>
Own Id: OTP-9387</p>
</item>
@@ -2779,7 +6945,7 @@
<item>
<p>
Fix non-existing function (erlang:disconnect/1) in
- distributed reference manual (Thanks to Fabian Kr�l)</p>
+ distributed reference manual (Thanks to Fabian Król)</p>
<p>
Own Id: OTP-9504</p>
</item>
@@ -2807,7 +6973,7 @@
only separator characters (comma and space).</p>
<p>
The same applies to epmd's -address option.(Thanks to
- Holger Wei�)</p>
+ Holger Weiß)</p>
<p>
Own Id: OTP-9525</p>
</item>
@@ -2951,7 +7117,7 @@
<p>
Add support for querying the number of configured and
online processors on SGI systems running IRIX.(Thanks to
- Holger Wei�)</p>
+ Holger Weiß)</p>
<p>
Own Id: OTP-9531</p>
</item>
@@ -3061,7 +7227,7 @@
using a comma-separated list. If the loopback address is
not in this list, it will be added implicitly, so that
the daemon can be queried by an interactive epmd
- process.(Thanks to Holger Wei�)</p>
+ process.(Thanks to Holger Weiß)</p>
<p>
Own Id: OTP-9213</p>
</item>
@@ -3096,7 +7262,7 @@
value over to dbg_gen_printf(). This fixes the problem
that errno had been reset to zero by the time it was used
(to print the corresponding error message) in the
- dbg_gen_printf() function. (Thanks to Holger Wei�)</p>
+ dbg_gen_printf() function. (Thanks to Holger Weiß)</p>
<p>
Own Id: OTP-9223</p>
</item>
@@ -3482,7 +7648,7 @@
Mention that "-detached" implies "-noinput"</p>
<p>
Clarify that specifying "-noinput" is unnecessary if the
- "-detached" flag is given. (thanks to Holger Wei�)</p>
+ "-detached" flag is given. (thanks to Holger Weiß)</p>
<p>
Own Id: OTP-9086</p>
</item>
@@ -3613,7 +7779,7 @@
<item>
<p>
The <c>configure</c> command line argument <seealso
- marker="doc/installation_guide:INSTALL#How-to-Build-and-Install-ErlangOTP_A-Closer-Look-at-the-individual-Steps_Configuring">--enable-ethread-pre-pentium4-compatibility</seealso>
+ marker="doc/installation_guide:INSTALL#Advanced-configuration-and-build-of-ErlangOTP">--enable-ethread-pre-pentium4-compatibility</seealso>
had no effect. This option is now also automatically
enabled if required on the build machine.</p>
<p>
@@ -3959,12 +8125,12 @@
Own Id: OTP-8726 Aux Id: seq11617 </p>
</item>
<item>
- <p>Fix libm linking with --as-needed flag
+ <p>Fix libm linking with --as-needed flag</p>
<p>
When building with "--as-needed" linker flags on Linux
the build will fail. This has now been fixed.</p>
<p>
- (Thanks to Christian Faulhammer)</p></p>
+ (Thanks to Christian Faulhammer)</p>
<p>
Own Id: OTP-8728</p>
</item>
@@ -4192,7 +8358,7 @@
platforms than before. If <c>configure</c> warns about no
atomic implementation available, try using the
<c>libatomic_ops</c> library. Use the <seealso
- marker="doc/installation_guide:INSTALL#How-to-Build-and-Install-ErlangOTP_A-Closer-Look-at-the-individual-Steps_Configuring">--with-libatomic_ops=PATH</seealso>
+ marker="doc/installation_guide:INSTALL#Advanced-configuration-and-build-of-ErlangOTP">--with-libatomic_ops=PATH</seealso>
<c>configure</c> command line argument when specifying
where the <c>libatomic_ops</c> installation is located.
The <c>libatomic_ops</c> library can be downloaded from:
@@ -4210,7 +8376,7 @@
the pentium 4 processor. If you want the runtime system
to be compatible with older processors (back to 486) you
need to pass the <seealso
- marker="doc/installation_guide:INSTALL#How-to-Build-and-Install-ErlangOTP_A-Closer-Look-at-the-individual-Steps_Configuring">--enable-ethread-pre-pentium4-compatibility</seealso>
+ marker="doc/installation_guide:INSTALL#Advanced-configuration-and-build-of-ErlangOTP">--enable-ethread-pre-pentium4-compatibility</seealso>
<c>configure</c> command line argument when configuring
the system.</p>
<p>
@@ -4988,7 +9154,7 @@
failed to detect gcc C compilers with other command line
names than gcc. `configure' now substitute GCC into the
makefiles. If CC is a gcc C compiler, GCC will have the
- value yes. (Thanks to Jean-S�bastien P�dron)</p>
+ value yes. (Thanks to Jean-Sébastien Pédron)</p>
<p>
Own Id: OTP-8373</p>
</item>
@@ -7358,7 +11524,7 @@
<p>
IPv6 name resolving has now been fixed to use
getaddrinfo() patch (thoroughly reworked) courtesy of Love
- H�rnquist-�strand submitted by Fredrik Thulin. It also
+ Hörnquist-Åstrand submitted by Fredrik Thulin. It also
can use gethostname2() patch (also reworked) courtesy of
Mikael Magnusson for debian submitted by Sergei Golovan.</p>
<p>