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Revision history for POE

Changes marked with "(!!!)" may break backward compatibility.
Versions with "_xx" subversions are internal test releases.  Most
subversions are available from <>.

0.10 2000.03.23 (!!!)

Added POE::Component to the MANIFEST.  Whoops!

Everything from 0.0901 through 0.0910 is included in this public
CPAN release.  People using 0.09 should read through to see
what has changed, paying extra attention to the bits marked

0.0910 2000.03.09 (!!!)

POE now keeps track of the file and line number where an event was
generated.  $session->option( default => 1 ) will report the line and
file, so you know where strange events came from.

(!!!) Add session ID to reference lookup from alias_resolve.
ID_id_to_session is depreciated.  The incompatibility here is that
session IDs take precedence over aliases, so sessions shouldn't be
aliased to numbers.

(!!!) Depreciated ID_session_to_id, since alias_resolve does the same
thing.  No warnings have been set yet, to give developers time to
react to the change.

Tweaked the Win32 support to eliminate some redefined sub warnings.

0.0909 2000.03.10

Removing closures in 0.0907 re-broke code that expect $wheel->event()
to take immediate effect.  Changed the wheels to use references
instead of direct event names, so that anonymous coderefs could have
closures whose values can be changed from outside.

0.0908 2000.03.09

Added logging to samples/poing.perl.  Now it records up and down times
to a tab-delimited file.

Added POE::Kernel::select_(pause|resume)_write, to pause and resume a
write select without bothering to maintain POE::Kernel's reference
counts on the filehandle.  Made POE::Wheel::ReadWrite use this instead
of POE::Kernel::select_write, which should improve performance a
little bit.

POE::Kernel::call was setting $! to 0 when it oughtn't.  $! now
properly reflects the status of POE::Kernel::call.

Removed the place-holder test that suggested people try the samples

Added t/01_sessions.t to test sessions (new and inline create) and
basic events (post, yield and call);

Added t/02_alarms.t to test delayed events (alarm, delay, alarm_add
and delay_add).

Added POE::Kernel::(alarm|delay)_add to post additional alarms to a
particular state.  Unlike POE::Kernel::(alarm|delay), these don't
clear existing alarms for the destination state.

Kicked off the POE::Component heirarchy with
POE::Component::Server::TCP (POE::Component is frequently abbreviated
as P::C in conversation but not in code).

0.0907 2000.03.02

Revised Wheel::SocketFactory's internal states to eliminate closures
keeping instances from self-destructing at proper times.  This would
keep socket factories alive after their last outside references were

Updated documentation for POE::Kernel::alarm()

0.0906 2000.02.20

Revised Wheel::ReadWrite->put() to return true if the high watermark
is reached; false if it hasn't been.  ReadWrite->put() may return true
without a corresponding high or low watermark event.

Changed samples/watermarks.perl to use ReadWrite->put()'s return
value, as well as the high and low mark states.  Commented the program
while I was in it.

Adding the water mark code reintroduced the closure bug that was fixed
in version 0.0804.  Now it is fixed.  Yet again.

Changed how DEB_* are defined in POE::Kernel.  It's now possible to
override the debugging constants before the first POE::Kernel use.
This lets programs have access to POE::Kernel's debugging code without
requiring programmers to find and edit it.

Fixed POE::Session's debugging constant to work like POE::Kernel's.

Documented POE::Kernel and POE::Session debugging flags in the
corresponding manpages.

0.0905 2000.02.20

Changed Wheel::ReadWrite's baaaaad $self to be a listref instead of a
hashref.  It should run marginally faster without having to look
things up in a hash all the time.

Added statistics accessors to Driver::SysRW (it's the only one so
far), and added corresponding accesors to Wheel::ReadWrite.

Added HighState and LowState to Wheel::ReadWrite->event, so these
states can be redefined on the fly.

Documented Wheel::ReadWrite->set_(high|low)_mark; they weren't
documented up to 0.0904.

Expanded samples/poing.perl to accept different forms of host lines in
.rc files.  Now accepts "host ip_address" or "host hostname" or "host
ip_address alias".  It will look up the missing information when the
first two formats are used; it can totally bypass looking up names or
addresses when the last format is used.  And aliases can be more
meaningful than host names.

EINPROGRESS isn't provided by ActiveState's POSIX module.  It also
seems to be meaningless on MSWin32 systems.  Since it's pretty
important for non-blocking connect() otherwise, I added a dummy
constant for it when POE is running on MSWin32 platforms.  This
affects POE::Kernel and Wheel::SocketFactory, which should now
work better on Windows systems.

Added a watermarks test, samples/watermarks.perl.

0.0904 2000.02.16

Replaced some lame hosts with some interesting routers in the
poing.perl sample.  For values of lame and interesting.  Added some
code to read configuration options from ~/.poingrc (or default to the
options after __END__) so I can change options to my heart's content
without annoying anyone.

Gabriel Kihlman <!gk> found a race in
SocketFactory's connect error detection.  Changed the way errors are
detected during connection, removing an entire state in the process.
People from Connecticut should let me know if this is a problem. :)

Added a brief note about _signal and _default signal-handling
semantics in POE::Session, with a pointer to the more comprehensive
POE::Kernel signal discussion.

Separated alarms from plain events.  Made the plain event queue FIFO;
the alarm queue time ordered.  Posting and dispatching events should
be faster, since they would not need to binary seek and insert.  This
turned out to be false, because the constant overhead of checking two
queues greatly offset any increased post/dispatch efficiency.  Backed
this "optimization" out.

Benchmarked several different "switch" implementations, only to find
out that if/elsif/else is fastest anyway.

Added internal event types within POE::Kernel.  The only thing anyone
will ever notice is a little better performance.

Fixed POE::Kernel->alarm() and POE::Kernel->delay() to make use of the
new internal event types.  Now these two functions can only discard
alarm events.  Documented the change.

Added POE::Kernel::queue_peek_alarms, which returns the pending alarm
events queued for the current session.

Updated samples/signals.perl to display pending alarms.

0.0903 2000.02.08 (!!!)

Put the incomplete, experimental Win32 code back.  It appears to have
been working all along!  Please note, this is only for making
filehandles non-blocking; it doesn't fix signals or fork or anything.

Add Artur's high/low watermark patches to Wheel::ReadWrite.  This is a
higher level watermark than previous patches, and it's not confined to
a particular driver (which is moot at this point, since there's only
one driver).  It implements high- and low-water callbacks instead of
performing its own flow control.  Documented them but didn't include a
watermark sample in this release.  A sample will be in by 0.10.

(!!!) Changed drivers' flush() and put() methods' return values.  They
now return pending octets instead of objects.  ReadWrite's water marks
rely on this to make the marks meaningful.  Updated documentation.

Changed Driver::SysRW's internal object from a hashref to an listref.
This is a minor micro-optimization, which may offset the
micro-pessimization introduced during octet counting.

0.0902 2000.02.07

Removed an underscore from the last change's version number in
Changes. :)

Abigail found a stupid bug in POE::Session->create's mishandling of
object_states.  Patch received and applied; testcase added to
samples/create.perl; bug fixed.

0.0901 2000.02.07

Added InputFilter and OutputFilter to POE::Wheel::ReadWrite's
constructor parameters.  This allows a ReadWrite wheel to use
different disciplines for input and output.

Added &set_input_filter and &set_output_filter to
POE::Wheel::ReadWrite.  Now &set_filter changes both the input and
output filters.  &set_input_filter and &set_output_filter alter
individual filters independent of the other.

Fixed samples/fakelogin.perl to test changing individual filters.

Changed a bunch of diagnostics to print $session->ID instead of
$session.  Debugging will be slower (that's debugging for you), but it
will also be friendlier.  Everybody needs a friend while debugging,

0.09 2000.01.25

Updated README with: new mailing list instructions, Windows
compatibility notes, removed POE2 notice.

All promises regarding the 0.09 feature/patch set have been met, and
the Changes since 0.08 are perhaps too long.  Bump the version to 0.09
and prepare for a CPAN release.

0.0808 2000.01.24

0.0806 broke Filter::Reference; fix it, and move the inclusion of
Compress::Zlib to runtime.  Now there's no startup penalty for people
not using Zlib.

0.0807 2000.01.24

Fix the release date for 0.0806 in the Changes file.

&Session::ID was removed for testing and never put back.  Put... the
function... BACK!

0.0806 2000.01.24 (!!!)

Added the ability to compress referenced data passing through
Filter::Reference.  This doesn't break backward compatibility, but it
may mean strange behavior if both ends of a Filter::Reference
connection don't agree on the compression mode.

Added the ability to map package and object states to methods that are
named differently.  This adds new syntax to POE::Session's new() and
create() constructors, as well as POE::Kernel->state().  The new test
in samples/objmaps.perl exercises the code.

(!!!) The ability to map package and object states to methods has
uncovered a problem with POE::Session->create's object_states
parameter.  This previously accepted a hashref, which stringified the
object references.  Now it requires an array reference instead.  The
package_states parameter is also expected to be an array reference

There seems to be renewed interest in Win32 support.  The previous
Win32 porting attempt was about a year ago, and it was never completed
or tested.  Since it's been so long, I've removed the code on the
assumption that a fresh start is better.  Patches welcome!

Added UDP support to SocketFactory.  This involved rewriting
&SocketFactory::new to be partially data driven; now it should be
easier to add new protocols and families.

Added UDP testing to samples/socketfactory.perl.

Addi found a bareword warning in samples/udp.perl; I renamed
$heap->{socket} to $heap->{socket_handle} to avoid it.

Michael Stevens (mstevens) found another $heap->{socket} bareword
warning in samples/poing.perl.

mstevens also reminded me that samples/poing.perl is running as root;
I added a -T switch to the #! line.  If poing.perl dies with a ``Too
late for -"t" option'' message, then you'll have to either remove the
-T from the #! line (not recommended) or run the script as:
/usr/bin/perl -T poing.perl

And mstevens pointed out that using -I.. on the #! line is a problem
in some Perl versions where POE otherwise runs fine.  I replaced the
-I.. switch with "use lib '..';", and things should be a lot happier.

And his ROWS and COLS environment variables really are LINES and
COLUMNS.  I fixed samples/poing.perl to recognize the alternate
environment variables and punt to 80 columns and/or 25 lines as a last

0.0805 2000.01.05

Added a getsockname() method to SocketFactory.  This is used to find
out which address and/or port a listening SocketFactory is bound to.
Great for servers that create dynamic listening sockets, like DCC and

Added code to samples/socketfactory.perl to display bind addresses
using $wheel->getsockname().

Made some minor cosmetic changes to SocketFactory.  This was to be a
clean rewrite of SocketFactory's internals so they could support new
protocols (like UDP), but time ran out.

Added samples/udp.perl to show how UDP sockets fit into the scheme of
things.  It's also to get me in the mood to support other protocols in

Fixed's documentation to include new tests and samples.  These
are poing.perl (multi-host ping); udp.perl; and wheels2.perl
(two-handle ReadWrite).

Barring problems [crosses fingers], 0.0805 will be the last subversion
before 0.09.  SocketFactory revisions should appear in 0.0901.

0.0804 1999.12.31

Reinstated the closure optimizations in the wheels.  They were removed
in version 0.0703.  It turns out that the closures are necessary to
prevent wheels from holding extra copies of their $self references.
The extra $self references kept them from self-destructing (Har!) in
Flushed states.  These closures work better than 0.0702's.

Wheel::FollowTail now wraps its seek() calls in eval blocks, in case
the tail being followed belongs to a pipe or otherwise unseekable

Cleaned up some ugly style in the places where things changed.  Made
some other style ugly.

0.0803 1999.12.28

Incorporated Kevin Lenzo's patch for Wheel::ReadWrite's support of
separate input and output filehandles.

SocketFactory's SuccessState and FailureState parameters can take
coderefs instead of state names, for quick one-off states and closure
tricks.  If this works and is generally useful, I'll add the feature
to other wheels.

Updated SocketFactory to return the remote address and port for
connecting sockets as well as accepted ones.  Updated the
socketfactory.perl sample program to display them.

0.0802 1999.12.25

Fixed the date for revision 0.0801 in the changes.

Added Kernel and Session IDs, at Philip Gwyn's insistence.  Each
session has a serial number, accessible by $session->ID().  POE's
kernel itself has a fairly unique ID, accessible by $poe_kernel->ID().

0.0801 1999.12.24

Added &POE::Kernel::fork() to provide safe child reaping.  This fork()
uses an event loop to poll for reapable children.  It fires a CHLD
signal at the session that called &POE::Kernel::fork(), using POE's
soft signals to avoid potential problems with Perl's signal handling.

Changed the preforkedserver.perl example to use &POE::Kernel::fork(),
but the sample program seems to be hideously broken as designed.

POE's SIGCHLD handler takes over Apache's when it's used in mod_perl.
Changed POE::Kernel to not register a SIGCHLD handler if it's running
under mod_perl.

Added SIGIDLE, a kinder, gentler SIGZOMBIE.  When an entire process
becomes idle, POE broadcasts SIGIDLE to everyone.  SIGIDLE is a plain
terminal signal; sessions won't die if it's handled.  POE checks for
continued idle-ness after SIGIDLE is dispatched; if the process hasn't
awakened, then SIGZOMBIE is broadcast to reap things.

Fixed names.perl to show SIGIDLE being caught.

Reordered the lookups in &POE::Kernel::alias_resolve, placing the more
common ones first.  Forced a look-up, even for Session references, so
that it would return ESRCH errors on sessions that disappeared but
were still being referenced.

0.08 1999.11.26

John Labovitz <!johnl> submitted a patch to change
Driver::SysRW's read block size.  He also pointed out that
Filter::Reference prefers to use freeze() instead of the more portable
nfreeze().  I applied a modified version of his block size patch, and
I changed Filter::Reference to prefer nfreeze().

There have been no complaints with the 0.07_xx subversions, and they
contain useful changes, so the version is bumped to 0.08.

Mentioned the "POE2" project in the README file.

Added an undocumented command line switch to samples/poing.perl that
specifies the maximum number of hours to run.

Changed the small/large queue limit for POE::Kernel::_enqueue_state
from 32 to 8.

Removed the hard requirement for optional modules: Storable;
Time::HiRes; HTTP::Request; HTTP::Response; HTTP::Status; URI::URL.
These aren't mandatory for basic POE things.

0.0704 1999.11.14

Include some modules that were mistakenly left out of 0.0703.

0.0703 1999.08.20

Removed closure optimizations from the Wheel classes.  The later
addition of $wheel->event() subtly broke them.

Added poing.perl, a multi-host ICMP ping program, to the samples
directory.  My ISP was down, so I hacked this together, "borrowing" a
lot of code from Net::Ping.  As such, it's neither friendly to
configure nor commented.

Sessions' "default" option didn't confess, contrary to the

0.0702 1999.07.30

Made BindAddress optional for UNIX client sockets.  It's still
required for server sockets.  Updated the documentation for the
change, fixed some typos, and included PF_INET and PF_UNIX.

Changed POE::Kernel::_enqueue_state from a linear search to a binary
search, but only if there are 32+ events in the queue.  Smaller queues
are still searched linearly, on assumption that it's quicker because
there's less overhead.

0.0701 1999.07.01

Fixed a race or TCP/IP stack problem in SocketFactory.  SocketFactory
was firing a "connect error 0" if the server side sent data
immediately.  The problem was tested on four systems: Linux (broke);
Solaris (broke); FreeBSD (worked); OS/2 (worked).  Go figure.  It
should work on all four now.

Modified POE::Filter::HTTPD to respond with the protocol version
(hardcoded to 1.0).  The wget utility had a problem with 'HTTP ...',
and I assume it won't be the only thing to.

Replaced a regular expression in POE::Filter::Reference with a
substr() call.  The regexp was used to frame input streams, and large
structures (over 32KB) were not being framed correctly.  This was
fixed in a previous version, but the fix was reverted for some reason.
The new &get method code also supports 0-byte blocks, which is
pointless for a Reference filter, but lets you use Reference as a
"reference" for other variable-length block filters. :)

0.07 1999.06.18 (!!!)

Revised the new manpages based on reader feedback.

Bumped the version number to 0.07 and released it to the CPAN.  This
version contains all the changes, including one minor interface
change.  It's that change that warrants the (!!!) icon, so don't
panic.  This is NOT another 0.05 -> 0.06 API changefest of pain.

0.0609 1999.06.15 (!!!)

Updated samples/*sessions.perl to test $kernel->state(...) and
discovered that the documentation was wrong about this function.
Thanks, Artur, for pointing this out.

Fixed the documentation for $kernel->state(...) with regards to
package and object sessions.

Made POE::Session an array reference, as part of the reorganization of
POE's internals.

Revised all the manpages.  Split the manpages into separate PODs, and
put them at the end of each module.  Rewnote the overview,
added some ASCII art, and threw away the "Design Goals" and related
hype.  Removed POE-TODO and POE-HINTS manpages.

Updated the README to be more readable.  Moved the mailing list and
web site information there.  Should either or both change, stale
information won't rot in a thousand manpages around the world.

Removed design notes from the ends of Kernel and Session, because docs
go there now.  Moved them to POE-TODO, which is now not included.

&POE::Session::create was broken-- I'm not sure how it worked to begin
with.  Fixed.

Revised the POE::Filter::HTTPD documentation to follow the rest of the
manpages' format.

(!!!) Minor interface change.  &POE::Session::option can now fetch
session option values without changing or deleting them in the

Changed $VERSION in to not preserve the version's underscore.
This changes the archive name format, so I'll start referring to
versions without the underscore.  Joy.

0.06_08 1999.05.30

Begin reorganizing POE development.  The tests/ subdirectory is now

Added POE-HINTS documentation.

Added POE::Curator, POE::Ojbect and POE::Runtime classes.  These
implement the start of the heretofore "Mythical" Object Layer.

Added samples/olayer.perl to test the current Object Layer features.
The object layer is in early development, so there's no documentation
outside the olayer.perl comments.

Applied Philip Gwyn's serialization patch to Filter::Reference.  Added
his serialization test as samples/ref-type.perl.  Updated
documentation for Filter::Reference to match patch.

Applied Philip Gwyn's updated patches for hot-swappable filters.
Added his filter swapping test as samples/filterchange.perl.  I have
much more confidence in this now that it's tested.

Updated documentation to point to the samples/ directory.

Fixed t/test.t to point to the samples/ directory.

Made dist on a FreeBSD system, so the permissions should be correct.

0.06_07 1999.05.12

"Crunch time" is sort of over.  An emergency in April put everything
on hold.  I had a lot of time away from working on POE, and I came
back refreshed and with some funky new ideas.  Unfortunately, it sort
of ruined my plans for releasing 0.07, and 0.07 is delayed until I
move development over to CVS.

&POE::Kernel::post() now returns undef for error.  The "success"
return value currently is 1, but this may change.  It's better right
now to check for definedness as success.  On error, $! will be set as
per &POE::Kernel::alias_resolve().

&POE::Kernel::call() has improved return values, similar to &post's.
See the docs.

&POE::Session::create is a new constructor, with some type checking.
It uses a completely different call signature.  See the docs.

Philip Gwyn's patches for hot-swappable filters are in.  They are
highly experimental and untested.  No guarantees, not even that
they'll exist in future releases.  Feedback would be appreciated.

0.06_06 1999.04.28

Added some defaults to SocketFactory: SocketDomain => AF_INET,
SocketType => SOCK_STREAM, SocketProtocol => 'tcp' (for INET sockets).

Changed SocketFactory semantics.  On Artur's insistence, SocketFactory
now uses RemoteAddress to determine the difference between connecting
and listening sockets.  ListenQueue now defaults to SOMAXCONN.  This
should not break existing programs.

The tests/*.perl programs have been updated to use SocketFactory in
recommended ways.

Added STATE to state (event handler) parameters.

0.06_05 1999.03.23

Wheel::ReadWrite would sometimes not fire an error event; fixed.

Added PREREQ_PM to Makefile.PL.  Theoretically, will
automagically install all POE's prerequisites now.  For completeness,
PREREQ_PM requires more than basic POE does.

0.06_04 1999.03.17

Entering "crunch time" for the 0.07 release.  Expect a lot of quick,
small-fix releases.

Fixed documentation bug.  It said FROM instead of SENDER.

POE::Session and POE::Wheel::* check for a POE::Kernel reference as
the first parameter.  This will detect old code and croak with better
error messages.

0.06_03 1999.03.17

Incorrect parameters to &POE::Session::new could cause an infinite
loop.  Fixed.

Depreciated posting/calling $_[HEAP] instead of $_[SESSION].

Allow posting to stringified session references.

Sessions will carp on invalid states, if their 'debug' option is set
and they do not have a _default state registered.

Added an event() method to the wheels.  This lets programs change the
events they emit without having to destroy them outright and create

Allow packed addresses in SocketFactory's parameters.

Documented the mailing list.

Fixed a race error in tests/proxy.perl.  It would die if the client
sent information before the server connection was made.

0.06_02 1999.02.20

Fixed POE documentation to stop being silly about => "stringifying"
things that it's not.  Sorry about that.

Updated tests/proxy.perl to queue data sent by the client before the
server connection is fully established.  Previously, the proxy would
try to call SocketFactory::put, and the proxy would die.  Whoops!

Updated SocketFactory to fail on unresolved hostnames.  Previously it
was relying on undef from Socket::sockaddr_in; now it checks the
inet_aton results.

Updated SocketFactory to generate FailureState on failure to connect.

Replaced SocketFactory's hard failures with FailureState events.

Fixed proxy.perl; it wasn't registering the proxy/server ReadWrite
wheel properly.

Assigned EADDRNOTAVAIL to $! if inet_aton fails in SocketFactory.  I
assumed inet_aton (gethostbyname, too) touch $! on failure.  Wrong!

0.06_01 1999.02.16

Added Kernel::session_create, a semantically sweeter version of C<new
POE::Session>, for people who prefer to think this way.

Added check for pre-packed INET addresses in Wheel::SocketFactory.
Previously it would try to inet_aton() them.

Added check for stringified session references in
Kernel::alias_resolve.  Now you can post/call to hash keys.

Added the event() method to existing POE::Wheel classes.  Now events
can be changed without destroying old wheels and creating new ones.

Made state redefinition warnings optional.  They will not appear
unless a session's 'debug' option is set.

Added tests/fakelogin.perl to test the event() method for ReadWrite.
The other wheels' event() methods are untested.  If they're broken,
let the author know.

Split the TO-DO list out of the main file.

0.06 1999.02.03 (!!!)

This is a public CPAN release.  It incorporates all the changes since
version 0.05.

0.05_57 1999.02.02 (!!!)

(!!!) Renamed POE::Session::debug() as POE::Session::option(), per
feedback from testers.  This changes the original "_debug" semantics
into something like environment variables for sessions.

The ReadWrite wheel's InputState is optional.  This allows for
write-only wheels, which are good for writing logs.  The
followtail.perl test has been updated to use such a wheel for its log
writer sessions.

The FollowTail wheel now has an optional PollInterval parameter, which
tells how long to wait (in seconds) between checking the file for new

0.05_56 1999.02.02

Crimson found the real cause of Perl's coredumps, which allowed the
0.05_54 change to be rolled back.

0.05_55 1999.02.01

(!!!) SIGWINCH is unsupported until Perl and/or POE implements safe
signals.  This signal was causing Perl to crash on xterm resizes.

(!!!) Sessions' "_debug" variables have been removed.  Instead,
POE::Session now has a debug() method.  This removes the _debug heap
pollution, and allows for several per-session debug flags.

0.05_54 1999.01.30

Backed out the change in 0.05_04 where wheels call their event
handlers directly.  This causes some sort of stupid closure or
destructor trick (we're still not sure which) that makes perl SEGV on
some systems.

0.05_52 1999.01.27

Added Win32 support for non-blocking sockets.  Unfortunately, the
Win32 port's select() doesn't appear to support regular files, so POE
is virtually useless for non-blocking filesystem work.  On the plus
side, sockets seem to function very well.  Thanks to Sean Puckett
(catbear) for tracking this down.

0.05_04 1999.01.15 (!!!)

Fixed again.  Storable's nfreeze is portable across
networks and faster than FreezeThaw, so it's preferred.  Thanks to
Artur Bergman for pointing this out.

(!!!) Changed _child parameters.  $from is always the kernel.  ARG0 is
either 'gain' if the parent is being given a child; 'lose' if its
child is being stopped; or 'create' if the new child was created by
this session.  ARG1 is always the child session's reference.  For
created sessions, ARG2 is the return value from the child's _start
event handler.

(!!!) Changed _parent parameters.  $from is always the kernel; ARG0 is
the old parent session; and ARG1 is the new parent session.

(!!!) Changed event handler parameter order, and introduced a way to
avoid future changes in the parameter order from breaking

Updated tests/*.perl examples to work with the new scheme of things.
Added comments, and generally cleaned things up.

Sessions' _start events may now include parameters.  The selects.perl
test is the first program to use this.

Wheels now call event handlers directly instead of posting events.
This should make things substantially faster.

(!!!) Changed filters' return values, to make them more compatible
with block and datagram protocols.  Most people won't notice the
difference, but this will break compatibility for Filter and Driver

0.05_03 1999.01.14 (!!!)

Fixed Kernel select dispatching.  Changing $_ in event handlers would
cause a fatal error.

Fixed  Frozen references were not being thawed correctly
under two conditions: If packet boundaries split them in certain
places, and later if they contained \n.  Thanks to sky and a-mused for
finding this one.

(!!!) Fixed signal handlers.  The kernel now waits on
SIGCHLD and only generates a CHLD signal event if the child PID is 0
or more.  The CHLD signal now includes the PID and $? as parameters.
The only programs that break are ones that explicitly wait.  It also
always generates SIGCHLD/SIGCLD events as "CHLD" to simplify handlers.

Fixed Kernel event dispatching so that events generated by select() no
longer outpace Kernel::run's ability to dispatch them.  Thanks to Dave
Paris for finding this.

Fixed to flush as much data as possible all at once.  This
should reduce events and overhead when sending a lot of data.  Thanks
to Dave Paris for pointing this out.

Added new tests.

0.05_02 1999.01.12 (!!!)

Fixed signals.  Now runs garbage collection on sessions after
execution returns from non-terminal signal handlers.

Fixed README, Changes, etc. to be more readable.  I hope.

Added tests/thrash.perl to check for memory leaks and benchmark

(!!!) Changed "exception" to "expedite", with regard to Kernel select

The thrash.perl results look pretty bad, and DProf blamed IO::Select,
so out it went.

Revised internal data structures to be more efficient.

(!!!) Removed support for multiple kernels, each to its own thread.
See the 0.05 SIGPIPE notes.

Rewrote documentation.  Split it from individual packages, and placed
it into its own pod file.

Added return values for Kernel::alias_* functions.

Localized $SIG{'__DIE__'} in "harmless" evals.

Inlined Kernel::_kernel_select().

Added Artur Bergman's support for "package" sessions, and
packagesessions.perl test.

(!!!) Fixed Filter::Line::put() to treat @_ as an array of lines.
This brings Filter::Line::put() into agreement with the documentation.

Added Filter::Stream, a "null" filter that passes data through

Added Kernel::yield.

Removed IO::Handle dependencies in the Kernel.  Now it will work with
plain old files as well.

Added return values for Kernel::state.

Created Wheel::SocketFactory, a replacement for IO::Socket::INET (tcp
only so far) and IO::Socket::UNIX.  All it does in create sockets,
though... the sockets don't have IO::Socket-style methods.

Made FreezeThaw the default for Filter::Reference, and issued a
mandatory warning if Storable is used.  Objects frozen with Storable
are not thawable on different-endian systems.

0.05 1998.12.04

Delayed garbage collection on new sessions.  Previously, sessions
would be tested for garbage collection immediately after creation.

Fixed a fatal bug in tests/proxy.perl.  Added ability to redirect
multiple ports.  Added more logging information.

Fixed SIGPIPE handling.  Previously, SIGPIPE would be dispatched to
every Session.  Now it is dispatched directly to the session that was
running when the signal occurred.  This probably breaks multithreaded
programs that contain multiple kernels, and I am considering dropping
multi-kernel support.

Fixed SIGRTMIN handling.  At least one system has this signal defined
in %SIG but doesn't support it.  Assigning to $SIG{'RTMIN'} there
causes an "Attempt to free unreferenced scalar" warning, and the test
program hangs.  POE now skips RTMIN and RTMAX when assigning handlers.

Added Filter::Reference, contributed by Artur Bergman
<>.  Filter::References enables POE to pass
copies of referenced data between processes.  It requires C<Storable>
or C<FreezeThaw>.

Fixed Wheel::ReadWrite::put().  It used to send a concatenated version
of @_ to its driver.  This broke Filter::Reference when putting a list
of references.  Now it's up to respective Filter classes to do the
right thing with @_.

Fixed Wheel::ReadWrite.  Now it sends FlushedState events when it

0.04 1998.11.24

Added $object->can($state) check when registering object methods as
states/event handlers.

Added Session aliases (symbolic references).  See tests/names.perl for
an example.

Added Kernel::signal($session, $name).  This sends signals directly to
POE::Sessions or POE::Kernels without going to the operating system
(which would send the signal to every kernel and session).  The
signals.perl test has been updated to test this.

Added Kernel::call().  Takes the same parameters as Kernel::post, but
dispatches the state/event immediately.  Returns whatever the event
handler did.  The sessions.perl test test has been updated to test

0.031 1998.11.24

Added tests/objsessions.perl to the manifest.  D'oh!

0.03  1998.11.23

Added new constructor syntax to POE::Session.  It's now possible to
say: new POE::Session($kernel, $object, \@methods).  See
tests/objsession.perl for an example.

Removed an unnecessary function call in

Rearranged Changes so the most recent ones come first.

0.02  1998.11.22

Rewrote signals.  Signals now propagate from parent to child sessions.
"Terminal" signals now only kill sessions that don't otherwise handle

Added subsecond resolution for alarms if Time::HiRes is available.
See the docs for POE::Kernel::alarm().

Added POE::Kernel::delay() for "time() + $seconds" alarms.  Uses
Kernel's time(), which may be from Time::HiRes.

Parent sessions will now wait around until all child sessions finish,
unless they're explicitly killed off.

Fixed a blessing bleed that caused implicitly returned objects to die
in the wrong scope (confounding resource management).

Added tests/proxy.perl, a simple line-based proxy example.

0.01  1998.08.15

Initial release.  Implemented Kernel, Session, Wheel, Driver, Filter.

- EOF: Thank you for reading. -