31
31
<p>This document describes the changes made to the ERTS application.</p>
33
<section><title>Erts 5.7.5</title>
35
<section><title>Fixed Bugs and Malfunctions</title>
39
Fix <c>binary_to_term</c> crash on compressed term with
40
corrupt size field.</p>
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Processes and/or ports could get stuck on a blocked
47
scheduler when <c>erlang:system_flag(multi_scheduling,
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block)</c> was used.</p>
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Processes and/or ports could get stuck on an offline
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scheduler when schedulers online were reduced using
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<c>erlang:system_flag(schedulers_online,
53
SchedulersOnline)</c>.</p>
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<p>Building on Windows will now work if the paths to
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<c>mc.exe</c> and <c>rc.exe</c> contain spaces. The
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README.win32 file has been updated with some information
61
about building using Visual Studio 2008. (Thanks to
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EPMD now correctly handles the extra data field which can
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be given in the ALIVE2_REQ request and retrieved in the
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PORT2_RESP response. (Thanks to Klas Johansson.)</p>
76
The configure test for reliable floating point exceptions
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has been update to work on modern versions of Mac OS X.
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(Thanks to Trannie Carter.)</p>
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ERTS makefiles used to detect the use of a gcc C compiler
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by checking if CC equaled gcc. That is, the makefiles
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failed to detect gcc C compilers with other command line
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names than gcc. `configure' now substitute GCC into the
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makefiles. If CC is a gcc C compiler, GCC will have the
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value yes. (Thanks to Jean-S�bastien P�dron)</p>
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ETS bug causing the <c>memory</c> counter from
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<c>ets:info</c> for ordered_set's to sometimes get out of
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synch and absurdly high.</p>
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Own Id: OTP-8377 Aux Id: seq11442 </p>
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Immediately repeated multi-scheduling block/unblock
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cycles using <c>erlang:system_flag(multi_scheduling,
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block | unblock)</c> could deadlock the runtime system.</p>
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<p>A number of bugs concerning re and unicode are
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<p>re:compile no longer looses unicode option, which also
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fixes bug in re:split.</p>
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<p>re:replace now handles unicode charlist replacement
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<p>re:replace now handles unicode RE charlist argument
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<p>re:replace now handles binary unicode output correctly
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when nothing is replaced.</p>
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<p>Most code, testcases and error isolation done by Rory
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The loading of native code was not properly atomic in the
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SMP emulator, which could cause crashes. Also a per-MFA
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information table for the native code has now been
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protected with a lock since it turns that it could be
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accessed concurrently in the SMP emulator. (Thanks to
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Mikael Pettersson.)</p>
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Fix processes in exiting status that are about to be
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scheduled, to not be allowed to garbage collect.</p>
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<p>Removed bogus "\011" character sequence in
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The resolver routines failed to look up the own node name
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as hostname, if the OS native resolver was erroneously
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configured, bug reported by Yogish Baliga, now fixed.</p>
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The resolver routines now tries to parse the hostname as
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an IP string as most OS resolvers do, unless the native
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resolver is used.</p>
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The DNS resolver inet_res and file resolver inet_hosts
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now do not read OS configuration files until they are
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needed. Since the native resolver is default, in most
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cases they are never needed.</p>
164
The DNS resolver's automatic updating of OS configuration
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file data (/etc/resolv.conf) now uses the 'domain'
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keyword as default search domain if there is no 'search'
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Own Id: OTP-8426 Aux Id: OTP-8381 </p>
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The re module: A regular expression with an option change
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at the start of a pattern that had top-level alternatives
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could cause overwriting and/or a crash. (Thanks to
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Harmless buffer overflow by one byte in asn1 and
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<section><title>Improvements and New Features</title>
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Improved GC performance after BIF/NIF call when a lot of
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heap fragments was created. This will mainly benefit NIFs
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that return large compound terms.</p>
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<p>Incompatible changes in the experimental NIF
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feature.</p> <list><item> Changed the NIF function
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prototypes in order to allow more than 3 function
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arguments. </item><item> <c>enif_get_data</c> renamed as
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<c>enif_priv_data</c>. </item><item>
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<c>enif_make_string</c> got a third argument for
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character encoding. </item><item> The return value of
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<c>erlang:load_nif/2</c> on error changed. </item></list>
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<p>Read more in the documentation of <c>erl_nif</c> and
211
<c>erlang:load_nif/2</c></p>.
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*** POTENTIAL INCOMPATIBILITY ***</p>
218
<p>Cross compilation improvements and other build system
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<p>Most notable:</p> <list><item> Lots of cross
221
compilation improvements. The old cross compilation
222
support was more or less non-existing as well as broken.
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Please, note that the cross compilation support should
224
still be considered as experimental. Also note that old
225
cross compilation configurations cannot be used without
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modifications. For more information on cross compiling
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Erlang/OTP see the <c>$ERL_TOP/INSTALL-CROSS.md</c> file.
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</item><item> Support for staged install using <url
229
href="http://www.gnu.org/prep/standards/html_node/DESTDIR.html">DESTDIR</url>.
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The old broken <c>INSTALL_PREFIX</c> has also been fixed.
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For more information see the <c>$ERL_TOP/INSTALL.md</c>
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file. </item><item> Documentation of the <c>release</c>
233
target of the top <c>Makefile</c>. For more information
234
see the <c>$ERL_TOP/INSTALL.md</c> file. </item><item>
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<c>make install</c> now by default creates relative
236
symbolic links instead of absolute ones. For more
237
information see the <c>$ERL_TOP/INSTALL.md</c> file.
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</item><item> <c>$ERL_TOP/configure --help=recursive</c>
239
now works and prints help for all applications with
240
<c>configure</c> scripts. </item><item> Doing <c>make
241
install</c>, or <c>make release</c> directly after
242
<c>make all</c> no longer triggers miscellaneous
243
rebuilds. </item><item> Existing bootstrap system is now
244
used when doing <c>make install</c>, or <c>make
245
release</c> without a preceding <c>make all</c>.
246
</item><item> The <c>crypto</c> and <c>ssl</c>
247
applications use the same runtime library path when
248
dynamically linking against <c>libssl.so</c> and
249
<c>libcrypto.so</c>. The runtime library search path has
250
also been extended. </item><item> The <c>configure</c>
251
scripts of <c>erl_interface</c> and <c>odbc</c> now
252
search for thread libraries and thread library quirks the
253
same way as <c>erts</c> do. </item><item> The
254
<c>configure</c> script of the <c>odbc</c> application
255
now also looks for odbc libraries in <c>lib64</c> and
256
<c>lib/64</c> directories when building on a 64-bit
257
system. </item><item> The <c>config.h.in</c> file in the
258
<c>erl_interface</c> application is now automatically
259
generated in instead of statically updated which reduces
260
the risk of <c>configure</c> tests without any effect.
262
<p>(Thanks to Henrik Riomar for suggestions and
264
<p>(Thanks to Winston Smith for the AVR32-Linux cross
265
configuration and testing)</p>
267
*** POTENTIAL INCOMPATIBILITY ***</p>
272
<p>NIF improvements:</p> <list><item> Driver API for
273
multi-threading made available for NIFs. </item><item>
274
Support for mempory managed (garbage collected) resource
275
objects. A way to pass "pointers" to native data
276
structures between C and Erlang in a safe way.
277
</item><item> Support for references, floats and term
278
comparison. </item><item> Various new functions, like
279
<c>enif_inspect_iolist_as_binary</c>,
280
<c>enif_make_sub_binary</c>, <c>enif_get_string</c>,
281
<c>enif_get_atom</c>, <c>enif_make_tuple_from_array</c>,
282
<c>enif_make_list_from_array</c>,
283
<c>enif_make_existing_atom</c>. </item></list>
289
Minor alignment adjustments of scheduler specific data.</p>
294
<p>The documentation is now possible to build in an open
295
source environment after a number of bugs are fixed and
296
some features are added in the documentation build
298
<p>- The arity calculation is updated.</p>
299
<p>- The module prefix used in the function names for
300
bif's are removed in the generated links so the links
302
"http://www.erlang.org/doc/man/erlang.html#append_element-2"
304
"http://www.erlang.org/doc/man/erlang.html#erlang:append_element-2".</p>
305
<p>- Enhanced the menu positioning in the html
306
documentation when a new page is loaded.</p>
307
<p>- A number of corrections in the generation of man
308
pages (thanks to Sergei Golovan)</p>
309
<p>- The legal notice is taken from the xml book file so
310
OTP's build process can be used for non OTP
317
There is new <c>erlang:binary_to_term/2</c> BIF that
318
takes an option list. The option <c>safe</c> can be used
319
to prevent creation of resources that are not garbage
320
collected (such as atoms). (Thanks to Jayson Vantuyl.)</p>
326
The default settings for garbage collection of binaries
327
has been adjusted to be less aggressive than in R13B03.
328
It is now also possible configure the settings for binary
329
GC. See the documentation for <c>spawn_opt/2-5</c>,
330
<c>erlang:system_info/1</c>, <c>erlang:system_flag/2</c>,
331
<c>process_flag/2-3</c>, <c>erlang:trace/3</c>, and the
332
documenation for <c>erl</c> for the new command line
333
options <c>+hms</c> and <c>+hmbs</c>.</p>
339
A bug causing memory corruption in re:run() has been
340
corrected. (Thanks to Yamashina Hio.)</p>
346
The <c>-Werror</c> option for <c>erlc</c> and the
347
compiler option <c>warnings_as_errors</c> will cause
348
warnings to be treated as errors. (Thanks to Christopher
355
Explicit top directories in archive files are now
358
For example, if an archive (app-vsn.ez) just contains an
359
app-vsn/ebin/mod.beam file, the file info for the app-vsn
360
and app-vsn/ebin directories are faked using the file
361
info from the archive file as origin. The virtual
362
direcories can also be listed. For short, the top
363
directories are virtual if they does not exist.</p>
369
An unnecessary lock operation in os:timestamp/0 has been
370
eliminated, making it slightly more efficient. (Thanks to
371
Jonas Falkevik and Tuncer Ayaz.)</p>
377
There is a new <c>+t</c> emulator option for changing the
378
maximum number of atoms. (Thanks to Julien Barbot.)</p>
384
Fixed numerous compiler warnings generated by gcc 4.4.1
385
and tile-cc 2.0.1.78377 when compiling the runtime
392
<c>configure</c> learned the option
393
<c>--enable-m32-build</c> to force the building of a
394
32-bit run-time on systems where the default C compiler
395
generates 64-bit executables by default.</p>
401
HiPE now works in the 64-bit emulator on Mac OS X.
402
(Thanks to Geoff Cant.)</p>
408
Improved handling of symbolic links to escripts</p>
414
Add lock profiling tool.</p>
416
The Lock profiling tool, lcnt, can make use of the
417
internal lock statistics when the runtime system is built
418
with this feature enabled.</p>
420
This provides a mechanism to examine potential lock
421
bottlenecks within the runtime itself.</p>
423
- Add erts_debug:lock_counters({copy_save, bool()}). This
424
option enables or disables statistics saving for
425
destroyed processes and ets-tables. Enabling this might
426
consume a lot of memory.</p>
428
- Add id-numbering for lock classes which is otherwise
435
Removed spurious options to the emulator from escript.</p>
441
Minor documentation fixes. Mainly anchor adjustments.</p>
33
450
<section><title>Erts 5.7.4</title>
35
452
<section><title>Fixed Bugs and Malfunctions</title>
added
removed
erts/doc/src/notes.xml
