perl594delta.1

视频监控网络部分的协议ddns,的模块的实现代码,请大家大胆指正.

\&\f(CW\*(C`encoding::warnings\*(C'\fR is now a lexical pragma. (Although on older perls,
which don't have support for lexical pragmas, it keeps its global
behaviour.) (Audrey Tang)
.IP "\(bu" 4
\&\f(CW\*(C`threads\*(C'\fR is now a dual-life module, also available on \s-1CPAN\s0. It has been
expanded in many ways. A \fIkill()\fR method is available for thread signalling.
One can get thread status, or the list of running or joinable threads.
.Sp
A new \f(CW\*(C`threads\->exit()\*(C'\fR method is used to exit from the application
(this is the default for the main thread) or from the current thread only
(this is the default for all other threads). On the other hand, the \fIexit()\fR
built-in now always causes the whole application to terminate. (Jerry
D. Hedden)
.Sh "New Core Modules"
.IX Subsection "New Core Modules"
.IP "\(bu" 4
\&\f(CW\*(C`Hash::Util::FieldHash\*(C'\fR, by Anno Siegel, has been added. This module
provides support for \fIfield hashes\fR: hashes that maintain an association
of a reference with a value, in a thread-safe garbage-collected way.
Such hashes are useful to implement inside-out objects.
.IP "\(bu" 4
\&\f(CW\*(C`Module::Build\*(C'\fR, by Ken Williams, has been added. It's an alternative to
\&\f(CW\*(C`ExtUtils::MakeMaker\*(C'\fR to build and install perl modules.
.IP "\(bu" 4
\&\f(CW\*(C`Module::Load\*(C'\fR, by Jos Boumans, has been added. It provides a single
interface to load Perl modules and \fI.pl\fR files.
.IP "\(bu" 4
\&\f(CW\*(C`Module::Loaded\*(C'\fR, by Jos Boumans, has been added. It's used to mark
modules as loaded or unloaded.
.IP "\(bu" 4
\&\f(CW\*(C`Package::Constants\*(C'\fR, by Jos Boumans, has been added. It's a simple
helper to list all constants declared in a given package.
.IP "\(bu" 4
\&\f(CW\*(C`Win32API::File\*(C'\fR, by Tye McQueen, has been added (for Windows builds).
This module provides low-level access to Win32 system \s-1API\s0 calls for
files/dirs.
.SH "Utility Changes"
.IX Header "Utility Changes"
.Sh "config_data"
.IX Subsection "config_data"
\&\f(CW\*(C`config_data\*(C'\fR is a new utility that comes with \f(CW\*(C`Module::Build\*(C'\fR. It
provides a command-line interface to the configuration of Perl modules
that use Module::Build's framework of configurability (that is,
\&\f(CW*::ConfigData\fR modules that contain local configuration information for
their parent modules.)
.SH "Documentation"
.IX Header "Documentation"
.Sh "New manpage, perlpragma"
.IX Subsection "New manpage, perlpragma"
The perlpragma manpage documents how to write one's own lexical
pragmas in pure Perl (something that is possible starting with 5.9.4).
.Sh "New manpage, perlreguts"
.IX Subsection "New manpage, perlreguts"
The perlreguts manpage, courtesy of Yves Orton, describes internals of the
Perl regular expression engine.
.Sh "New manpage, perlunitut"
.IX Subsection "New manpage, perlunitut"
The perlunitut manpage is an tutorial for programming with Unicode and
string encodings in Perl, courtesy of Juerd Waalboer.
.SH "Performance Enhancements"
.IX Header "Performance Enhancements"
.Sh "Memory optimisations"
.IX Subsection "Memory optimisations"
Several internal data structures (typeglobs, GVs, CVs, formats) have been
restructured to use less memory. (Nicholas Clark)
.Sh "\s-1UTF\-8\s0 cache optimisation"
.IX Subsection "UTF-8 cache optimisation"
The \s-1UTF\-8\s0 caching code is now more efficient, and used more often.
(Nicholas Clark)
.Sh "Regular expressions"
.IX Subsection "Regular expressions"
.IP "Engine de-recursivised" 4
.IX Item "Engine de-recursivised"
The regular expression engine is no longer recursive, meaning that
patterns that used to overflow the stack will either die with useful
explanations, or run to completion, which, since they were able to blow
the stack before, will likely take a very long time to happen. If you were
experiencing the occasional stack overflow (or segfault) and upgrade to
discover that now perl apparently hangs instead, look for a degenerate
regex. (Dave Mitchell)
.IP "Single char char-classes treated as literals" 4
.IX Item "Single char char-classes treated as literals"
Classes of a single character are now treated the same as if the character
had been used as a literal, meaning that code that uses char-classes as an
escaping mechanism will see a speedup. (Yves Orton)
.IP "Trie optimisation of literal string alternations" 4
.IX Item "Trie optimisation of literal string alternations"
Alternations, where possible, are optimised into more efficient matching
structures. String literal alternations are merged into a trie and are
matched simultaneously.  This means that instead of O(N) time for matching
N alternations at a given point the new code performs in O(1) time. (Yves
Orton)
.Sp
\&\fBNote:\fR Much code exists that works around perl's historic poor
performance on alternations. Often the tricks used to do so will disable
the new optimisations. Hopefully the utility modules used for this purpose
will be educated about these new optimisations by the time 5.10 is
released.
.IP "Aho-Corasick start-point optimisation" 4
.IX Item "Aho-Corasick start-point optimisation"
When a pattern starts with a trie-able alternation and there aren't
better optimisations available the regex engine will use Aho-Corasick
matching to find the start point. (Yves Orton)
.Sh "Sloppy stat on Windows"
.IX Subsection "Sloppy stat on Windows"
On Windows, perl's \fIstat()\fR function normally opens the file to determine
the link count and update attributes that may have been changed through
hard links. Setting ${^WIN32_SLOPPY_STAT} to a true value speeds up
\&\fIstat()\fR by not performing this operation. (Jan Dubois)
.SH "Installation and Configuration Improvements"
.IX Header "Installation and Configuration Improvements"
.Sh "Relocatable installations"
.IX Subsection "Relocatable installations"
There is now Configure support for creating a relocatable perl tree. If
you Configure with \f(CW\*(C`\-Duserelocatableinc\*(C'\fR, then the paths in \f(CW@INC\fR (and
everything else in \f(CW%Config\fR) can be optionally located via the path of the
perl executable.
.PP
That means that, if the string \f(CW".../"\fR is found at the start of any
path, it's substituted with the directory of $^X. So, the relocation can
be configured on a per-directory basis, although the default with
\&\f(CW\*(C`\-Duserelocatableinc\*(C'\fR is that everything is relocated. The initial
install is done to the original configured prefix.
.Sh "Ports"
.IX Subsection "Ports"
Many improvements have been made towards making Perl work correctly on
z/OS.
.PP
Perl has been reported to work on DragonFlyBSD.
.Sh "Compilation improvements"
.IX Subsection "Compilation improvements"
All \fIppport.h\fR files in the \s-1XS\s0 modules bundled with perl are now
autogenerated at build time. (Marcus Holland-Moritz)
.Sh "New probes"
.IX Subsection "New probes"
The configuration process now detects whether \fIstrlcat()\fR and \fIstrlcpy()\fR are
available.  When they are not available, perl's own version is used (from
Russ Allbery's public domain implementation).  Various places in the perl
interpreter now use them. (Steve Peters)
.Sh "Windows build improvements"
.IX Subsection "Windows build improvements"
.IP "Building \s-1XS\s0 extensions" 4
.IX Item "Building XS extensions"
Support for building \s-1XS\s0 extension modules with the free MinGW compiler has
been improved in the case where perl itself was built with the Microsoft
\&\s-1VC++\s0 compiler. (ActiveState)
.IP "Support for 64\-bit compiler" 4
.IX Item "Support for 64-bit compiler"
Support for building perl with Microsoft's 64\-bit compiler has been
improved. (ActiveState)
.SH "Selected Bug Fixes"
.IX Header "Selected Bug Fixes"
.Sh "\s-1PERL5SHELL\s0 and tainting"
.IX Subsection "PERL5SHELL and tainting"
On Windows, the \s-1PERL5SHELL\s0 environment variable is now checked for
taintedness. (Rafael Garcia-Suarez)
.Sh "Using *FILE{\s-1IO\s0}"
.IX Subsection "Using *FILE{IO}"
\&\f(CW\*(C`stat()\*(C'\fR and \f(CW\*(C`\-X\*(C'\fR filetests now treat *FILE{\s-1IO\s0} filehandles like *FILE
filehandles. (Steve Peters)
.Sh "Overloading and reblessing"
.IX Subsection "Overloading and reblessing"
Overloading now works when references are reblessed into another class.
Internally, this has been implemented by moving the flag for \*(L"overloading\*(R"
from the reference to the referent, which logically is where it should
always have been. (Nicholas Clark)
.Sh "Overloading and \s-1UTF\-8\s0"
.IX Subsection "Overloading and UTF-8"
A few bugs related to \s-1UTF\-8\s0 handling with objects that have
stringification overloaded have been fixed. (Nicholas Clark)
.Sh "eval memory leaks fixed"
.IX Subsection "eval memory leaks fixed"
Traditionally, \f(CW\*(C`eval \*(Aqsyntax error\*(Aq\*(C'\fR has leaked badly. Many (but not all)
of these leaks have now been eliminated or reduced. (Dave Mitchell)
.Sh "Random device on Windows"
.IX Subsection "Random device on Windows"
In previous versions, perl would read the file \fI/dev/urandom\fR if it
existed when seeding its random number generator.  That file is unlikely
to exist on Windows, and if it did would probably not contain appropriate
data, so perl no longer tries to read it on Windows. (Alex Davies)
.SH "New or Changed Diagnostics"
.IX Header "New or Changed Diagnostics"
.ie n .IP "State variable %s will be reinitialized" 4
.el .IP "State variable \f(CW%s\fR will be reinitialized" 4
.IX Item "State variable %s will be reinitialized"
One can assign initial values to state variables, but not when they're
declared as a sub-part of a list assignment. See perldiag.
.SH "Changed Internals"
.IX Header "Changed Internals"
A new file, \fImathoms.c\fR, contains functions that aren't used anymore in
the perl core, but remain around because modules out there might
still use them. They come from a factorization effort: for example, many
\&\s-1PP\s0 functions are now shared for several ops.
.PP
The implementation of the special variables $^H and %^H has changed, to
allow implementing lexical pragmas in pure perl.
.SH "Known Problems"
.IX Header "Known Problems"
One warning test (number 263 in \fIlib/warnings.t\fR) fails under \s-1UTF\-8\s0
locales.
.PP
Bytecode tests fail under several platforms. We are considering removing
support for byteloader and compiler before the 5.10.0 release.
.SH "Reporting Bugs"
.IX Header "Reporting Bugs"
If you find what you think is a bug, you might check the articles
recently posted to the comp.lang.perl.misc newsgroup and the perl
bug database at http://rt.perl.org/rt3/ .  There may also be
information at http://www.perl.org/ , the Perl Home Page.
.PP
If you believe you have an unreported bug, please run the \fBperlbug\fR
program included with your release.  Be sure to trim your bug down
to a tiny but sufficient test case.  Your bug report, along with the
output of \f(CW\*(C`perl \-V\*(C'\fR, will be sent off to [e-mail] to be
analysed by the Perl porting team.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
The \fIChanges\fR file for exhaustive details on what changed.
.PP
The \fI\s-1INSTALL\s0\fR file for how to build Perl.
.PP
The \fI\s-1README\s0\fR file for general stuff.
.PP
The \fIArtistic\fR and \fICopying\fR files for copyright information.