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<p>This document describes the changes made to the ERTS application.</p>
+<section><title>Erts 8.1</title>
+
+ <section><title>Fixed Bugs and Malfunctions</title>
+ <list>
+ <item>
+ <p>
+ Fix bug for calls from hipe code to BIFs that disable GC
+ while yielding. Has been causing Dialyzer crashes on ARM
+ (and presumably all other non-intel platforms).</p>
+ <p>
+ Own Id: OTP-13724 Aux Id: PR-1116 </p>
+ </item>
+ <item>
+ <p>
+ Fix a bug where changing the current working directory of
+ the VM would not change the current working directory of
+ programs spawned using <c>erlang:open_port({spawn,""},
+ ...)</c>.</p>
+ <p>
+ Own Id: OTP-13733 Aux Id: ERL-175 </p>
+ </item>
+ <item>
+ <p>
+ Fix a bug where disabling tracing from a process that had
+ return_to tracing enabled and was tracing on
+ <c>erlang:trace/3</c> would cause a segmentation fault.</p>
+ <p>
+ Own Id: OTP-13734</p>
+ </item>
+ <item>
+ <p>
+ Update all erts documentation to use simpler English, use
+ consistent terminology and be easier to navigate.</p>
+ <p>
+ Own Id: OTP-13740</p>
+ </item>
+ <item>
+ <p>
+ Add dirty schedulers to the microstate accounting
+ statistics.</p>
+ <p>
+ Own Id: OTP-13744</p>
+ </item>
+ <item>
+ <p>
+ Fixed dirty scheduler build support on 32-bit windows.</p>
+ <p>
+ Own Id: OTP-13759</p>
+ </item>
+ <item>
+ <p>
+ inet:getstat(Socket) on an SCTP socket returned 0 for
+ send stats. This bug has now been corrected. Reported by
+ systra as issue ERL-102 on bugs.erlang.org.</p>
+ <p>
+ Own Id: OTP-13773 Aux Id: ERL-102 </p>
+ </item>
+ <item>
+ <p>
+ AF_UNSPEC and unknown address families were misread by
+ UDP receive in prim_inet resulting in an exception. This
+ bug has now been corrected.</p>
+ <p>
+ Own Id: OTP-13775</p>
+ </item>
+ <item>
+ <p>
+ Sweep HiPE stack for literals during code purge.</p>
+ <p>
+ Own Id: OTP-13777 Aux Id: PR-1122 </p>
+ </item>
+ <item>
+ <p>
+ Fix bug in run_erl for OpenBSD that could cause it on
+ rare occations to exit without starting the program (erl)
+ at all.</p>
+ <p>
+ Own Id: OTP-13795</p>
+ </item>
+ <item>
+ <p>
+ Update build scripts to not make assumtions about where
+ env, cp and perl are located.</p>
+ <p>
+ Own Id: OTP-13800</p>
+ </item>
+ <item>
+ <p>
+ Fixed a bug where init:stop could deadlock if a process
+ with infinite shutdown timeout (e.g. a supervisor)
+ attempted to load code while terminating.</p>
+ <p>
+ Own Id: OTP-13802</p>
+ </item>
+ <item>
+ <p>
+ Fixed a segmentation fault on sparc CPUs when free'ing a
+ tracer module's state.</p>
+ <p>
+ Own Id: OTP-13803</p>
+ </item>
+ <item>
+ <p>
+ <c>fun</c>s was not properly handled during purge of a
+ module. This could cause a crash of the VM after a purge
+ of a module.</p>
+ <p>
+ Own Id: OTP-13809</p>
+ </item>
+ <item>
+ <p>
+ Fixed a memory leak when the process monitoring a port
+ crashed.</p>
+ <p>
+ Own Id: OTP-13818</p>
+ </item>
+ <item>
+ <p>
+ Fixed multiple dirty scheduler related tracing bugs.</p>
+ <p>
+ Own Id: OTP-13822</p>
+ </item>
+ <item>
+ <p>
+ Fix error handling in beam code runtime loader for a
+ number of cases when index and size fields got corrupted
+ (negative) values.</p>
+ <p>
+ Own Id: OTP-13848 Aux Id: ERL-216 </p>
+ </item>
+ <item>
+ <p>
+ Minor fix of dirty scheduler implementation.</p>
+ <p>
+ Own Id: OTP-13852</p>
+ </item>
+ <item>
+ <p>
+ Calls to <c>erl_drv_send_term()</c> or
+ <c>erl_drv_output_term()</c> from a non-scheduler thread
+ while the corresponding port was invalid caused the
+ emulator to enter an inconsistent state which eventually
+ caused an emulator crash.</p>
+ <p>
+ Own Id: OTP-13866</p>
+ </item>
+ <item>
+ <p>
+ Fix a rare race condition in <c>erlang:open_port({spawn,
+ ""}, ...)</c> that would result in the erl_child_setup
+ program aborting and cause the emulator to exit.</p>
+ <p>
+ Own Id: OTP-13868</p>
+ </item>
+ <item>
+ <p>Driver and NIF operations accessing processes or ports
+ could cause an emulator crash when used from
+ non-scheduler threads. Those operations are:</p> <list>
+ <item><c>erl_drv_send_term()</c></item>
+ <item><c>driver_send_term()</c></item>
+ <item><c>erl_drv_output_term()</c></item>
+ <item><c>driver_output_term()</c></item>
+ <item><c>enif_send()</c></item>
+ <item><c>enif_port_command()</c></item> </list>
+ <p>
+ Own Id: OTP-13869</p>
+ </item>
+ <item>
+ <p>
+ Fix start scripts generation dependency in Makefile</p>
+ <p>
+ Own Id: OTP-13871 Aux Id: ERL-241 </p>
+ </item>
+ <item>
+ <p>
+ The VM could crash if <c>erlang:get_stacktrace()</c> was
+ called after a rescheduled NIF had thrown an exception.</p>
+ <p>
+ Own Id: OTP-13877</p>
+ </item>
+ <item>
+ <p>Calling <c>code:delete/1</c> before a loading a module
+ with an on_load function, the old code would be
+ overwritten, causing a memory or a crash if NIFs were
+ involved. (Thanks to vans163 for reporting this bug.)</p>
+ <p>
+ Own Id: OTP-13893 Aux Id: ERL-240 </p>
+ </item>
+ </list>
+ </section>
+
+
+ <section><title>Improvements and New Features</title>
+ <list>
+ <item>
+ <p>
+ Improved accuracy of timeouts on MacOS X. This by setting
+ premature timeouts followed by a short actual timeout
+ during scheduler wait.</p>
+ <p>
+ Own Id: OTP-13698</p>
+ </item>
+ <item>
+ <p>Added the following symbolic time unit representations
+ to the <seealso
+ marker="erlang#type-time_unit"><c>erlang:time_unit()</c></seealso>
+ type:</p> <list> <item><c>second</c></item>
+ <item><c>millisecond</c></item>
+ <item><c>microsecond</c></item>
+ <item><c>nanosecond</c></item> </list> <p>The following
+ symbolic time unit representations are now
+ <em>deprecated</em>, but still part of the
+ <c>erlang:time_unit()</c> type:</p> <list>
+ <item><c>seconds</c></item>
+ <item><c>milli_seconds</c></item>
+ <item><c>micro_seconds</c></item>
+ <item><c>nano_seconds</c></item> </list>
+ <p>
+ Own Id: OTP-13735</p>
+ </item>
+ <item>
+ <p>
+ Fix maps hashing entropy of maps with maps keys.</p>
+ <p>
+ Own Id: OTP-13763 Aux Id: ERL-199 </p>
+ </item>
+ <item>
+ <p>
+ Improved dirty scheduler support. A purge of a module can
+ now be performed without having to wait for completion of
+ all ongoing dirty NIF calls.</p>
+ <p>
+ Note that when enabling support for dirty schedulers, a
+ new purge strategy will as of ERTS version 8.1 be
+ enabled. This new strategy is not fully backwards
+ compatible with the strategy used by default. For more
+ information see the documentation of <seealso
+ marker="erts:erlang#check_process_code/3"><c>erlang:check_process_code/3</c></seealso>.</p>
+ <p>
+ Own Id: OTP-13808 Aux Id: OTP-13833 </p>
+ </item>
+ <item>
+ <p>
+ A new purge strategy has been introduced. The new
+ strategy will by default be disabled during the OTP 19
+ release, but will be the only strategy available as of
+ the OTP 20 release.</p>
+ <p>
+ The new strategy is slightly incompatible with the
+ strategy being used by default in OTP 19. Using the
+ default strategy, processes holding <c>fun</c>s that
+ refer to the module being purged either fail a soft
+ purge, or will be killed during a hard purge. The new
+ strategy completely ignores <c>fun</c>s. If <c>fun</c>s
+ referring to the code being purged exist, and are used
+ after a purge, an exception will be raised upon usage.
+ That is, the behavior will be exactly the same as the
+ case when a <c>fun</c> is received by a process after the
+ purge.</p>
+ <p>
+ The new strategy can optionally be enabled when building
+ OTP during OTP 19, and will automatically be enabled if
+ the runtime system is built with support for dirty
+ schedulers.</p>
+ <p>
+ For more information see the documentation of <seealso
+ marker="erts:erlang#check_process_code/3"><c>erlang:check_process_code/3</c></seealso>.</p>
+ <p>
+ Own Id: OTP-13833</p>
+ </item>
+ <item>
+ <p>
+ Fixed unnecessary overestimation of heap size need during
+ garbage collection.</p>
+ <p>
+ Own Id: OTP-13851</p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
<section><title>Erts 8.0.5</title>
<section><title>Fixed Bugs and Malfunctions</title>