Skip to content


Subversion checkout URL

You can clone with
Download ZIP
A public libevent repository. The official repository is still at at git://
C CMake Python Groff C++ Shell Makefile
Pull request Compare This branch is 102 commits ahead of nmathewson:master.

evthread: fix evthread_setup_global_lock_() for debug-lock with a rea…

…l-lock case

Sample bt:
  (gdb) bt
  #0  0x00000000004a95d2 in evthread_setup_global_lock_ (lock_=0x0, locktype=0, enable_locks=1)
  #1  0x00000000004afbc7 in evsig_global_setup_locks_ (enable_locks=1) at signal.c:475
  #2  0x00000000004a5da8 in event_global_setup_locks_ (enable_locks=1) at event.c:3838
  #3  0x00000000004a8983 in evthread_set_lock_callbacks (cbs=0x7fffffffdde0) at evthread.c:129
  #4  0x0000000000445a8f in use_lock_unlock_profiler () at regress_bufferevent.c:306
  #5  0x0000000000445af2 in test_bufferevent_pair_release_lock (arg=0x70e710) at regress_bufferevent.c:327
  #6  0x000000000048c9a8 in testcase_run_bare_ (testcase=0x6fdc10 <bufferevent_testcases+80>) at tinytest.c:105
  #7  0x000000000048cc8a in testcase_run_one (group=0x6ff270 <testgroups+112>, testcase=0x6fdc10 <bufferevent_testcases+80>) at tinytest.c:252
  #8  0x000000000048d5c9 in tinytest_main (c=3, v=0x7fffffffe008, groups=0x6ff200 <testgroups>) at tinytest.c:434
  #9  0x000000000047a08f in main (argc=3, argv=0x7fffffffe008) at regress_main.c:459

Found-with: regress bufferevent/bufferevent_pair_release_lock (-DEVENT__DISABLE_DEBUG_MODE=ON)
latest commit e4556fcda7
@azat azat authored
Failed to load latest commit information.
WIN32-Code Increment version to 2.1.5-beta
cmake This fixes a bug introduced in 27bd9fa
compat/sys Fix all identifiers with names beginning with underscore.
include http: export evhttp_connection_set_family()
m4 Merge remote-tracking branch 'origin/patches-2.0'
sample sample/https-client: add -timeout option
test test/regress_be: drop debug __asm__(int3) to fix arm build
.gitignore sample: add HTTP CONNECT tunnelling example using libevent http layer
.travis.yml travis: add builds without debug mode into matrix
CMakeLists.txt test: run regress with EVENT_DEBUG_MODE=1 and without
ChangeLog Update changelog
ChangeLog-1.4 Try to finalize changelog situation for 2.1.1-alpha
ChangeLog-2.0 Update ChangeLog-2.0
Doxyfile Fix doxygen to use new macro conventions
LICENSE Implement fast/precise monotonic clocks on Windows Increment version to 2.1.5-beta
Makefile.nmake Fix so that old nmake project still builds. Update
appveyor.yml Use autotools for appveyor until cmake is fixed.
arc4random.c Merge remote-tracking branch 'origin/patches-2.0' Prefer autoreconf -ivf to manual
buffer.c Don't use BSD u_* types.
buffer_iocp.c Have all visible internal function names end with an underscore.
bufferevent-internal.h Add missing include of <netinet/in.h>.
bufferevent.c expose bufferevent_incref/decref (with fewer modifications)
bufferevent_async.c be async: avoid double close()
bufferevent_filter.c Call underlying bev ctrl SET_FD on filtered bufferevents
bufferevent_openssl.c be_openssl: don't use *_auto() in do_handshake() we can't have fd == …
bufferevent_pair.c be_pair: release shared lock with the latest of bufferevent_pair
bufferevent_ratelim.c Pass and return const for bufferevent_get_token_bucket_cfg
bufferevent_sock.c be_sock: bufferevent_socket_set_conn_address(): assert instead of sil…
changelist-internal.h Implemented EV_CLOSED event for epoll backend (EPOLLRDHUP). Increment version to 2.1.5-beta
defer-internal.h fix the return value of event_deferred_cb_schedule_
devpoll.c Have all visible internal function names end with an underscore.
epoll.c Do not offer EV_FEATURE_EARLY_CLOSE if we have no EPOLLRDHUP
epoll_sub.c Merge remote-tracking branch 'origin/patches-2.0'
epolltable-internal.h Split epoll lookup table into a separate header file
evbuffer-internal.h Fix CVE-2014-6272 in Libevent 2.1
evconfig-private.h.cmake Generate a dummy evconfig-private.h so things build properly. Clean up lingering _identifiers.
evdns.3 improved nroff mdoc for the man page
evdns.c Merge pull request #212 from xbao/master
event-config.h.cmake Merge remote-tracking branch 'origin/pr/110'
event-internal.h Add a prototype for event_disable_debug_mode()
event.3 Don't use BSD u_* types.
event.c Fix checking for make_base_notifiable()
event_iocp.c Merge remote-tracking branch 'origin/patches-2.0' Merge remote-tracking branch 'origin/patches-2.0'
event_tagging.c Include <sys/ioctl.h>, <sys/resource.h> and <sys/wait.h> optionally.
evmap-internal.h Have all visible internal function names end with an underscore.
evmap.c Implemented EV_CLOSED event for epoll backend (EPOLLRDHUP).
evport.c Have all visible internal function names end with an underscore.
evrpc-internal.h Add an include to evrpc-internal to fix openbsd compilation warning
evrpc.c Fix even more coverity warnings.
evsignal-internal.h Add a new libevent_global_shutdown() to free all globals before exiting.
evthread-internal.h Fix "function declaration isn’t a prototype"
evthread.c evthread: fix evthread_setup_global_lock_() for debug-lock with a rea…
evthread_pthread.c Clean up lingering _identifiers.
evthread_win32.c Merge remote-tracking branch 'origin/patches-2.0'
evutil.c Test against SO_REUSEADDR (along with _WIN32).
evutil_rand.c Merge remote-tracking branch 'origin/patches-2.0'
evutil_time.c Implement new/free for struct evutil_monotonic_timer and export monot…
ht-internal.h ht-internal: don't reset hth_table_length explicitly in name_##HT_CLEAR
http-internal.h Don't use BSD u_* types.
http.c Include <sys/ioctl.h>, <sys/resource.h> and <sys/wait.h> optionally.
iocp-internal.h Have all visible internal function names end with an underscore.
ipv6-internal.h Convert include-guard macro convention to avoid reserved identifiers
kqueue-internal.h Replace pipe-based notification with EVFILT_USER where possible
kqueue.c Assume that ke_udata is an integer type on CloudABI. Change use of AC_CHECK_LIB to AC_SEARCH_LIBS. Use correct openssl libs and includes in pkgconfig file Add pkgconfig files for libevent_{openssl,pthreads}
listener.c Fix potential fd leak in listener_read_cb()
log-internal.h Actually use the log facility for reporting evdns problems.
log.c Actually use the log facility for reporting evdns problems.
make-event-config.sed Generate event-config.h with a single sed script Implemented EV_CLOSED event for epoll backend (EPOLLRDHUP).
minheap-internal.h Remove an unreachable return statement in minheap-internal.h
mm-internal.h Convert include-guard macro convention to avoid reserved identifiers
poll.c Split out time-related prototypes into time-internal.h
ratelim-internal.h Have all visible internal function names end with an underscore.
select.c Tweak the new evutil_weakrand_() code
signal.c Merge remote-tracking branch 'github/20_win64_compilation' into 21_wi…
strlcpy-internal.h Fix all identifiers with names beginning with underscore.
strlcpy.c Fix all identifiers with names beginning with underscore.
time-internal.h Implement new/free for struct evutil_monotonic_timer and export monot…
util-internal.h util: make @sa const for evutil_socket_connect_()
whatsnew-2.0.txt "buffer" spelling
whatsnew-2.1.txt Add new APIs to whatsnew-2.1
win32select.c Don't use BSD u_* types.

libevent logo

Appveyor Win32 Build Status Travis Build Status



 $ ./configure
 $ make
 $ make verify   # (optional)
 $ sudo make install

CMake (Windows)

Install CMake:

 $ md build && cd build
 $ cmake -G "Visual Studio 10" ..   # Or whatever generator you want to use cmake --help for a list.
 $ start libevent.sln

CMake (Unix)

 $ mkdir build && cd build
 $ cmake ..     # Default to Unix Makefiles.
 $ make
 $ make verify  # (optional)



To build libevent, type

 $ ./configure && make

(If you got libevent from the git repository, you will first need to run the included "" script in order to generate the configure script.)

You can run the regression tests by running

 $ make verify

Install as root via

 $ make install

Before reporting any problems, please run the regression tests.

To enable the low-level tracing build the library as:

 $ CFLAGS=-DUSE_DEBUG ./configure [...]

Standard configure flags should work. In particular, see:

--disable-shared Only build static libraries --prefix Install all files relative to this directory.

The configure script also supports the following flags:

--enable-gcc-warnings Enable extra compiler checking with GCC. --disable-malloc-replacement Don't let applications replace our memory management functions --disable-openssl Disable support for OpenSSL encryption. --disable-thread-support Don't support multithreaded environments.

CMake (Windows)

(Note that autoconf is currently the most mature and supported build enviroment for libevent; the cmake instructions here are new and experimental, though they should be solid. We hope that cmake will still be supported in future versions of Libevent, and will try to make sure that happens.)

First of all install

To build libevent using Microsoft Visual studio open the "Visual Studio Command prompt" and type:

$ cd <libevent source dir>
$ mkdir build && cd build
$ cmake -G "Visual Studio 10" ..   # Or whatever generator you want to use cmake --help for a list.
$ start libevent.sln

In the above, the ".." refers to the dir containing the Libevent source code. You can build multiple versions (with different compile time settings) from the same source tree by creating other build directories.

It is highly recommended to build "out of source" when using CMake instead of "in source" like the normal behaviour of autoconf for this reason.

The "NMake Makefiles" CMake generator can be used to build entirely via the command line.

To get a list of settings available for the project you can type:

$ cmake -LH ..


CMake also provides a GUI that lets you specify the source directory and output (binary) directory that the build should be placed in.

OpenSSL support

To build Libevent with OpenSSL support you will need to have OpenSSL binaries available when building, these can be found here:


For the latest released version of Libevent, see the official website at .

There's a pretty good work-in-progress manual up at .

For the latest development versions of Libevent, access our Git repository via

$ git clone git://

You can browse the git repository online at:

To report bugs, request features, or submit patches to Libevent, use the Sourceforge trackers at

There's also a libevent-users mailing list for talking about Libevent use and development:


The following people have helped with suggestions, ideas, code or fixing bugs:

  • Samy Al Bahra
  • Antony Antony
  • Jacob Appelbaum
  • Arno Bakker
  • Weston Andros Adamson
  • William Ahern
  • Ivan Andropov
  • Sergey Avseyev
  • Avi Bab
  • Joachim Bauch
  • Andrey Belobrov
  • Gilad Benjamini
  • Stas Bekman
  • Denis Bilenko
  • Julien Blache
  • Kevin Bowling
  • Tomash Brechko
  • Kelly Brock
  • Ralph Castain
  • Adrian Chadd
  • Lawnstein Chan
  • Shuo Chen
  • Ka-Hing Cheung
  • Andrew Cox
  • Paul Croome
  • George Danchev
  • Andrew Danforth
  • Ed Day
  • Christopher Davis
  • Mike Davis
  • Frank Denis
  • Antony Dovgal
  • Mihai Draghicioiu
  • Alexander Drozdov
  • Mark Ellzey
  • Shie Erlich
  • Leonid Evdokimov
  • Juan Pablo Fernandez
  • Christophe Fillot
  • Mike Frysinger
  • Remi Gacogne
  • Artem Germanov
  • Alexander von Gernler
  • Diego Giagio
  • Artur Grabowski
  • Diwaker Gupta
  • Kuldeep Gupta
  • Sebastian Hahn
  • Dave Hart
  • Greg Hazel
  • Nicholas Heath
  • Michael Herf
  • Sebastian Hahn
  • Savg He
  • Mark Heily
  • Maxime Henrion
  • Michael Herf
  • Greg Hewgill
  • Andrew Hochhaus
  • Aaron Hopkins
  • Tani Hosokawa
  • Jamie Iles
  • Xiuqiang Jiang
  • Claudio Jeker
  • Evan Jones
  • Marcin Juszkiewicz
  • George Kadianakis
  • Makoto Kato
  • Phua Keat
  • Azat Khuzhin
  • Alexander Klauer
  • Kevin Ko
  • Brian Koehmstedt
  • Marko Kreen
  • Ondřej Kuzník
  • Valery Kyholodov
  • Ross Lagerwall
  • Scott Lamb
  • Christopher Layne
  • Adam Langley
  • Graham Leggett
  • Volker Lendecke
  • Philip Lewis
  • Zhou Li
  • David Libenzi
  • Yan Lin
  • Moshe Litvin
  • Simon Liu
  • Mitchell Livingston
  • Hagne Mahre
  • Lubomir Marinov
  • Abilio Marques
  • Nicolas Martyanoff
  • Abel Mathew
  • Nick Mathewson
  • James Mansion
  • Nicholas Marriott
  • Andrey Matveev
  • Caitlin Mercer
  • Dagobert Michelsen
  • Andrea Montefusco
  • Mansour Moufid
  • Mina Naguib
  • Felix Nawothnig
  • Trond Norbye
  • Linus Nordberg
  • Richard Nyberg
  • Jon Oberheide
  • John Ohl
  • Phil Oleson
  • Alexey Ozeritsky
  • Dave Pacheco
  • Derrick Pallas
  • Tassilo von Parseval
  • Catalin Patulea
  • Patrick Pelletier
  • Simon Perreault
  • Dan Petro
  • Pierre Phaneuf
  • Amarin Phaosawasdi
  • Ryan Phillips
  • Dimitre Piskyulev
  • Pavel Plesov
  • Jon Poland
  • Roman Puls
  • Nate R
  • Robert Ransom
  • Balint Reczey
  • Bert JW Regeer
  • Nate Rosenblum
  • Peter Rosin
  • Maseeb Abdul Qadir
  • Wang Qin
  • Alex S
  • Gyepi Sam
  • Hanna Schroeter
  • Ralf Schmitt
  • Mike Smellie
  • Steve Snyder
  • Nir Soffer
  • Dug Song
  • Dongsheng Song
  • Hannes Sowa
  • Joakim Soderberg
  • Joseph Spadavecchia
  • Kevin Springborn
  • Harlan Stenn
  • Andrew Sweeney
  • Ferenc Szalai
  • Brodie Thiesfield
  • Jason Toffaletti
  • Brian Utterback
  • Gisle Vanem
  • Bas Verhoeven
  • Constantine Verutin
  • Colin Watt
  • Zack Weinberg
  • Jardel Weyrich
  • Jay R. Wren
  • Zack Weinberg
  • Mobai Zhang
  • Alejo
  • Alex
  • Taral
  • propanbutan
  • masksqwe
  • mmadia
  • yangacer

If we have forgotten your name, please contact us.

Something went wrong with that request. Please try again.