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Back when deferred_cb stuff had its own queue, the queue was always executed, but we never ran more than 16 callbacks per iteration. That made for two problems: 1: Because deferred_cb stuff would always run, and had no priority, it could cause priority inversion. 2: It doesn't respect the max_dispatch_interval code. Then, when I refactored deferred_cb to be a special case of event_callback, that solved the above issues, but made for two more issues: 3: Because deferred_cb stuff would always get the default priority, it could could low-priority bufferevents to get too much priority. 4: With code like bufferevent_pair, it's easy to get into a situation where two deferreds keep adding one another, preventing the event loop from ever actually scanning for more events. This commit fixes the above by giving deferreds a better notion of priorities, and by limiting the number of deferreds that can be added to the _current_ loop iteration's active queues. (Extra deferreds are put into the active_later state.) That isn't an all-purpose priority inversion solution, of course: for that, you may need to mess around with max_dispatch_interval.
0. BUILDING AND INSTALLATION (Briefly)
$ ./configure
$ make
$ make verify # (optional)
$ sudo make install
1. BUILDING AND INSTALLATION (In Depth)
To build libevent, type
$ ./configure && make
(If you got libevent from the git repository, you will
first need to run the included "autogen.sh" 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.
2. USEFUL LINKS:
For the latest released version of Libevent, see the official website at
http://libevent.org/ .
There's a pretty good work-in-progress manual up at
http://www.wangafu.net/~nickm/libevent-book/ .
For the latest development versions of Libevent, access our Git repository
via
"git clone git://levent.git.sourceforge.net/gitroot/levent/libevent"
You can browse the git repository online at
http://levent.git.sourceforge.net/git/gitweb-index.cgi .
To report bugs, request features, or submit patches to Libevent,
use the Sourceforge trackers at
https://sourceforge.net/tracker/?group_id=50884 .
There's also a libevent-users mailing list for talking about Libevent
use and development: http://archives.seul.org/libevent/users/
3. ACKNOWLEDGMENTS
The following people have helped with suggestions, ideas, code or
fixing bugs:
Samy Al Bahra
Jacob Appelbaum
Arno Bakker
Weston Andros Adamson
William Ahern
Ivan Andropov
Sergey Avseyev
Avi Bab
Joachim Bauch
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 Danforth
Ed Day
Christopher Davis
Mike Davis
Mihai Draghicioiu
Alexander Drozdov
Mark Ellzey
Shie Erlich
Leonid Evdokimov
Christophe Fillot
Mike Frysinger
Remi Gacogne
Alexander von Gernler
Artur Grabowski
Sebastian Hahn
Dave Hart
Greg Hazel
Michael Herf
Sebastian Hahn
Savg He
Mark Heily
Michael Herf
Greg Hewgill
Aaron Hopkins
Tani Hosokawa
Jamie Iles
Claudio Jeker
Evan Jones
George Kadianakis
Phua Keat
Kevin Ko
Brian Koehmstedt
Marko Kreen
Valery Kyholodov
Ross Lagerwall
Scott Lamb
Christopher Layne
Adam Langley
Graham Leggett
Philip Lewis
Zhou Li
David Libenzi
Yan Lin
Moshe Litvin
Mitchell Livingston
Hagne Mahre
Lubomir Marinov
Abilio Marques
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
Phil Oleson
Dave Pacheco
Tassilo von Parseval
Catalin Patulea
Simon Perreault
Pierre Phaneuf
Amarin Phaosawasdi
Ryan Phillips
Dimitre Piskyulev
Pavel Plesov
Jon Poland
Nate R
Robert Ransom
Bert JW Regeer
Peter Rosin
Maseeb Abdul Qadir
Wang Qin
Alex S
Hanna Schroeter
Ralf Schmitt
Mike Smellie
Kevin Springborn
Nir Soffer
Harlan Stenn
Steve Snyder
Dug Song
Dongsheng Song
Hannes Sowa
Ferenc Szalai
Brodie Thiesfield
Jason Toffaletti
Gisle Vanem
Bas Verhoeven
Constantine Verutin
Colin Watt
Zack Weinberg
Jardel Weyrich
Alejo
Alex
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