Documentation Development Beat

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= Checkpoint and Restore Applications with CRUI =
= Perl =
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The CRIU (Checkpoint/Restore in User-space) projects offers a user-space implementation of process and process group checkpoint/restore. With the user-space tools crtools included in this release it is possible checkpoint processes and restore them at a later time again (e.g. after a crash) or migrate the checkpointed process or process group to another system. CRIU aims to be as transparent as possible so that no instrumentation or re-compilation of the process to be checkpointed is necessary.
== Perl updated to 5.16 ==
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Perl 5.16 introduces a number of significant changes:
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=== New Features ===
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Using the `crtools` package, users can easily checkpoint and restore processes with the crtools package:
* Unicode 6.1
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* More consistent ''eval'' controlled with ''unicode_eval'' and ''evalbytes'' feature
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* 2- and 3-argument ''substr'' called in left-value context is evaluted even after changing original string
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* New ''T_*REF_REFCOUNT_FIXED'' XS typemap fixing reference counter decremetion
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* New ''is_utf8_char_buf'' XS-callable function replaces broken ''is_utf8_char'' function
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* ''$$'' variable is writable
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* Improved debugger: tracing mode can be restricted to certain level, breakpoints can be disabled temporarily, breakpoints can be set by file name
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* ''sort'' subroutines can be autoloaded
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* ''$['' variable is provided by ''arybase'' module
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* mmaped PerlIO layer is now a separate module ''PerlIO::mmap''
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=== Deprecated Features ===
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`crtools dump -D <dump-directory> -t <PID>`
* Accessing Unicode database files directly is deprecated now; use ''Unicode::UCD'' instead
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* ''Version::Requirements'' is deprecated in favor of ''CPAN::Meta::Requirements''
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=== Incompatible Changes ===
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`crtools restore -D <dump-directory -t <PID>`
* Special blocks (e.g. ''BEGIN'') are called in void context
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* Unoverloaded stringification of regular expression does not return the expression literal
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* ''T_DATAUNIT'' and ''T_CALLBACK'' XS typemaps removed
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* User defined case-changing has been removed in favor of ''Unicode::Casing''
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* XSUB C functions are static now and they are not exported from their object files
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* Read-only references cannot be weaken
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* ''$$'',  ''$<'', ''$>'', ''$('', and ''$)'' do not cache their value
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* ''Devel::DProf'', ''Shell'' have been removed from Perl core
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* perl4 libraries removed: abbrev.pl, assert.pl, bigfloat.pl, bigint.pl, bigrat.pl, cacheout.pl, complete.pl, ctime.pl, dotsh.pl, exceptions.pl, fastcwd.pl, flush.pl, getcwd.pl, getopt.pl, getopts.pl, hostname.pl, importenv.pl, lib/find{,depth}.pl, look.pl, newgetopt.pl, open2.pl, open3.pl, pwd.pl, hellwords.pl, stat.pl, tainted.pl, termcap.pl, timelocal.pl
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== PCRE Libraries updated to 8.30 ==
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To learn more about CRUI, visit http://criu.org and read `man 1 crtools`
Fedora 18 will provide PCRE ( Perl-Compatible Regular Expression ) libraries of version 8.30 or newer. This brings UTF-16 support and API changes, which are documented by the changelog and NEWS provided in /usr/share/doc/pcre*
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= Python updated to 3.3 =
 
The system Python 3 stack has been upgraded to 3.3 (the system Python 2 stack remains at 2.7), bringing in hundreds of fixes and tweaks; for a list of changes see http://docs.python.org/dev/whatsnew/3.3.html
 
 
= Ruby on Rails framework updated =
 
Fedora 18 will provide Ruby on Rails 3.2, the latest version of the Ruby on Rails framework. Developers are able to use the latest Ruby on Rails features, which are documented in the project's release notes:
 
http://guides.rubyonrails.org/3_2_release_notes.html
 
http://guides.rubyonrails.org/3_1_release_notes.html
 
 
= Clojure joined by leiningen and tools =
 
Fedora 18 now ships a more complete Clojure programming stack, including the build tool Leiningen. This will make it easier to package other Clojure libraries in the future.
 
 
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[[Category:Draft documentation]]
 
[[Category:Documentation beats]]
 
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Revision as of 05:54, 8 May 2013

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Work on beats has now moved to git. If you have changes or additions, please contact the docs team via #fedora-docs, docs@lists.fp.o, or with the fedora-release-notes BZ component.

Checkpoint and Restore Applications with CRUI

The CRIU (Checkpoint/Restore in User-space) projects offers a user-space implementation of process and process group checkpoint/restore. With the user-space tools crtools included in this release it is possible checkpoint processes and restore them at a later time again (e.g. after a crash) or migrate the checkpointed process or process group to another system. CRIU aims to be as transparent as possible so that no instrumentation or re-compilation of the process to be checkpointed is necessary.

Using the `crtools` package, users can easily checkpoint and restore processes with the crtools package:

`crtools dump -D <dump-directory> -t <PID>`

`crtools restore -D <dump-directory -t <PID>`

To learn more about CRUI, visit http://criu.org and read `man 1 crtools`