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Nick Mathewson
ddd69d391e
EVENT_BASE_FLAG_PRECISE_TIMER indicates we want fine timer precision
There are a bunch of backends that can give us a reasonably good monotonic timer quickly, or a very precise monotonic timer less quickly. For example, Linux has CLOCK_MONOTONIC_COARSE (1msec precision), which is over twice as fast as CLOCK_MONOTONIC. Since epoll only lets you wait with 1msec precision, CLOCK_MONOTONIC_COARSE is a clear win. On Windows, you've got GetTickCount{,64}() which is fast, and QueryPerformanceCounter, which is precise but slow. Note that even in the cases where the underlying timer claims to have nanosecond resolution, we're still not exposing that via Libevent. Note also that "Precision" isn't the same as "Resolution" or "Accuracy". A timer's precision is the smallest change that the clock will register; a timer's resolution is the fineness of its underlying representation; a timer's accuracy is how much it drifts with respect to "Real Time", whatever that means. (Terms and definitions from PEP 418.)
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 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 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 Taral propanbutan mmadia If we have forgotten your name, please contact us.
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