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Hash : 2c66983a
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Date : 2010-10-24T11:51:14
Simplify the logic for choosing EPOLL_CTL_ADD vs EPOLL_CTL_MOD Previously, we chose "ADD" whenever old_events==new_events, (since we expected the add to fail with EEXIST), or whenever old_events was==0, and MOD otherwise (i.e., when old_events was nonzero and not equal to new_events). But now that we retry failed MOD events as ADD *and* failed ADD events as MOD, the important thing is now to try to guess right the largest amount of the time, since guessing right means we do only one syscall, but guessing wrong means we do two. When old_events is 0, ADD is probably right (unless we're hitting the dup bug, when we'll fall back). And when old_events is set and != new_events, MOD is almost certainly right for the same reasons as before. But when old_events is equal to new events, then MOD will work fine unless we closed and reopened the fd, in which case we'll have to fall back to the ADD case. (Redundant del/add pairs are more common than closes for most use cases.) This change lets us avoid calculating new_events, which ought to save a little time in epoll.c
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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.) Install as root via # make install You can run the regression tests by running $ make verify 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://monkey.org/~provos/libevent/ . 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: Alejo Weston Andros Adamson William Ahern Avi Bab Gilad Benjamini Stas Bekman Joachim Bauch Ralph Castain Shuo Chen Ka-Hing Cheung Andrew Danforth Christopher Davis Mike Davis Mihai Draghicioiu Shie Erlich Alexander von Gernler Artur Grabowski Michael Herf Sebastian Hahn Aaron Hopkins Tani Hosokawa Claudio Jeker Valery Kyholodov Marko Kreen Scott Lamb Christopher Layne Adam Langley Christopher Layne Philip Lewis Zhou Li David Libenzi Moshe Litvin Hagne Mahre Lubomir Marinov Nick Mathewson James Mansion Nicholas Marriott Andrey Matveev Caitlin Mercer Felix Nawothnig Trond Norbye Richard Nyberg Jon Oberheide Phil Oleson Dave Pacheco Tassilo von Parseval Simon Perreault Pierre Phaneuf Ryan Phillips Jon Poland Bert JW Regeer Hanna Schroeter Ralf Schmitt Mike Smellie Kevin Springborn Ferenc Szalai Dug Song Brodie Thiesfield Jason Toffaletti Zack Weinberg Taral propanbutan mmadia If we have forgotten your name, please contact us.