Libevent 2.2.1-alpha includes a number of new features and performance
improvements.

The log below tries to organize them by rough area of effect.

This release contains around 1000 patches (without merges) with 151 new
contributors!

Some keywords highlights of this major release:

• wepoll backend (by Nick Grifka, @nigriMSFT, #1006)
• signalfd backend (by Dmitry Antipov, @dmantipov, #1342)
• DNS over TCP for evdns (by ayuseleznev, @seleznevae, #1004)
• websockets layer (by Dmitry Ilyin, @widgetii, #1322)
• "prepare" and "check" watchers (by Dan Rosen, @mergeconflict, #793)
• MbedTLS support (by okhowang, @okhowang, #1028)
• unix domain sockets for HTTP (by Sean Young, @seanyoung, #322)
• cmake over autotools/automake
• extensive CI (significant work by converting to github actions had been done by @ygj6, #951)
• documentation deploy - https://libevent.org/doc/

More descriptive changelog you will find in Changelog,
and there are some documentation about newly added features in whatsnew-2.2.txt

And here is a full list of all contributors:

@aapeliv @Aleksandr-Melnikov @alexbudgh @andreazevedo @azat @Berbe @Biswa96 @boryssmejda @botovq @carenas @chenshuo @chrstphrchvz @chux0519 @Coeur @cuishuang @cybojanek @danielkempenich @davidben @DavidKorczynski @ddcc @ddiss @delimitry @dmantipov @dota17 @dpayne @edigaryev @edo9300 @ejurgensen @emilengler @emmenlau @Epixu @fanquake @ffontaine @frestr @froexilize @fuel7inc @guoxiangCN @heaven-hq @hustlijian @hwhsu1231 @hwti @ibauersachs @ihsinme @iysheng @JackBoosY @jbeich @jcoffland @jeremy-murphy @jrtc27 @Keelan10 @keith @kenpingliu @kroeckx @krytarowski @lemourin lukka/run-vcpkg@v7 @lux01 @mareksm @mayerui @mdavidsaver @mergeconflict @mkckr0 @mkm85 @moonlightsh @msharov @NathanFrench @Neilpang @ngie-eign @ngorskikh @nicboul @nigriMSFT @nzh63 @OgreTransporter @okhowang @okodron @peadar @PhilipHomburg @ploxiln @posborne @pprindeville @ranchothu @rectified95 @rpavlik @sclei @seleznevae @sem-hub @sorc1 @stoeckmann @sungjungk @supersaiyanmode @Syedh30 @thuantr-dek @tobhe @tobim @uniontech-lilinjie @vjardin @wataash @wcsjdzz @widgetii @wodny @wrowe @ygj6 @yifan19 @yogo1212 @yongw5 @ZhipengXue97 @zltl

This release contains only bug fixes.

• PR: #1045
• ChangeLog: https://raw.githubusercontent.com/libevent/libevent/release-2.1.12-stable/ChangeLog

Please note, that you should use dist archives, i.e. libevent-2.1.11-stable.tar.gz, not the sources generated by github automatically

This release contains one ABI breakage fix (that had been introduced in
2.1.10, and strictly speaking this release breaks ABI again to make it
compatible with 2.1.9 and less, please take a look at 1810497 for more
details). Apart from that it contains some bug fixes, that grouped below.

And even though the return value for evbuffer_setcb() had been changed it
should ABI compatible (anyway that function is in -compat.h header).

There is also one patch that introduce new functionality, this is 546a366,
to tune SO_RCVBUF/SO_SNDBUF in evdns, but one can count it as a bug-fix on
the application level, since before you cannot tune this settings and hence
you could stumble on problems.

P.S. please use dist archives, i.e. libevent-2.1.11-stable.tar.gz (not the sources generated by github automatically)

Finally 2.1.x stable release - 2.1.10-stable.

This release contains mostly fixes (some evbuffer oddity, AF_UNIX handling in http server, some UB fixes and others) but also some new functionality (without ABI breakage as usual) and now dist archive can be used for building on windows (getopt had been added into it).

I'm not going to attach ChangeLog here (since it is pretty large), but
for those who is curios you can find it here:
https://raw.github.com/libevent/libevent/release-2.1.10-stable/ChangeLog

It has been tested in next environment (with both cmake/autotools build
systems):

• ubuntu
• freebsd
• osx
• windows
• netbsd
• solaris
• centos

As usual, many thanks to everyone who helped with
debugging/backporting/reporting/testing and fixing issues!

(please note, that you need "libevent-2.1.10-stable.tar.gz" not "Source
code" links, since later requires running ./autogen.sh)

New 2.1.x release is out - 2.1.9-beta. The reason why it is beta, is
because it is better to have few weeks (or more) to know about possible
problems (although I'm pretty sure that it is good enough to be
stable).

2.1.9 contains almost all patches from 2.2 (since 2.2 contains almost
bug fixes only, except I guess only few patches or so), and it is pretty
stable in regression tests, but not without failures (some flackiness
still presented), although this is not the problem of libevent itself,
but it's tests.

I'm not going to attach ChangeLog here (since it is pretty large), but
for those who is curios you can find it here:
https://raw.github.com/libevent/libevent/release-2.1.9-beta/ChangeLog

It has been tested in next environment (with both cmake/autotools build
systems):

• ubuntu
• freebsd
• osx
• windows
• netbsd
• solaris
• centos

As usual, many thanks (especially for those how reminded about making
new releases) to everyone who helped with
debugging/backporting/reporting/testing and fixing issues!

(please note, that you need "libevent-2.1.9-beta.tar.gz" not "Source
code" links, since later requires running ./autogen.sh)

First of let me say that everyone who still uses 2.0.x should strongly consider switching to 2.1.x releases, since 2.0.x will not contain all the bug fixes, because it can be pretty hard to backport them (for example 2.0.x does not support openssl 1.1)

Secondly, this release is beta, because since the last release it has been along time, so we need sometime to stabilize things a little, and if none of you will find something odd the it will be marked as 2.0.24-stable.

Many thanks to all who reported, fixed and helped with debugging issues and backporting patches!

Few words about release:

• 2.0 backport branch (patches-2.0) had been added to the travis-ci for continuous integration (c52cdc2)
• fix overflow check in expand_singlechain() (backport for #340) (7dedc07)
• ipv6 fix for http (502c043)
• Check for Mac OS X 10.4 kqueue bug properly (6762a4d)
• bufferevent_socket_connect{,_hostname}() fixes (ebcf2fed)
• Use the free-trailing-chains function in evbuffer_insert_chain too (0e894fb)
• evbuffer_add: Use last_with_datap if set, not last. (b00db82)
• fixes for EV_ET (e12762a5, 11732245)
• Merge branch 'evbuffer_add_file-2.0-fixes' into patches-2.0 (90ae4c5)
• If evsel->del() fails, don't leave the evmap in an inconsistent state. (cb81be2b)
• Backport for #340 (fix overflow check in expand_singlechain() (7dedc07)
• Use the free-trailing-chains function in evbuffer_insert_chain too (0e894fb)

For more information follow changelog/git log.

P.S. changelog contains duplicated entries, because of my mistake in my onelinear (different commit sha length).