/src/libev/Changes
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- Revision history for libev, a high-performance and full-featured event loop.
- 4.03 Tue Jan 11 14:37:25 CET 2011
- - officially support polling files with all backends.
- - support files, /dev/zero etc. the same way as select in the epoll
- backend, by generating events on our own.
- - ports backend: work around solaris bug 6874410 and many related ones
- (EINTR, maybe more), with no performance loss (note that the solaris
- bug report is actually wrong, reality is far more bizarre and broken
- than that).
- - define EV_READ/EV_WRITE as macros in event.h, as some programs use
- #ifdef to test for them.
- - new (experimental) function: ev_feed_signal.
- - new (to become default) EVFLAG_NOSIGMASK flag.
- - new EVBACKEND_MASK symbol.
- - updated COMMON IDIOMS SECTION.
- 4.01 Fri Nov 5 21:51:29 CET 2010
- - automake fucked it up, apparently, --add-missing -f is not quite enough
- to make it update its files, so 4.00 didn't install ev++.h and
- event.h on make install. grrr.
- - ev_loop(count|depth) didn't return anything (Robin Haberkorn).
- - change EV_UNDEF to 0xffffffff to silence some overzealous compilers.
- - use "(libev) " prefix for all libev error messages now.
- 4.00 Mon Oct 25 12:32:12 CEST 2010
- - "PORTING FROM LIBEV 3.X TO 4.X" (in ev.pod) is recommended reading.
- - ev_embed_stop did not correctly stop the watcher (very good
- testcase by Vladimir Timofeev).
- - ev_run will now always update the current loop time - it erroneously
- didn't when idle watchers were active, causing timers not to fire.
- - fix a bug where a timeout of zero caused the timer not to fire
- in the libevent emulation (testcase by Péter Szabó).
- - applied win32 fixes by Michael Lenaghan (also James Mansion).
- - replace EV_MINIMAL by EV_FEATURES.
- - prefer EPOLL_CTL_ADD over EPOLL_CTL_MOD in some more cases, as it
- seems the former is *much* faster than the latter.
- - linux kernel version detection (for inotify bug workarounds)
- did not work properly.
- - reduce the number of spurious wake-ups with the ports backend.
- - remove dependency on sys/queue.h on freebsd (patch by Vanilla Hsu).
- - do async init within ev_async_start, not ev_async_set, which avoids
- an API quirk where the set function must be called in the C++ API
- even when there is nothing to set.
- - add (undocumented) EV_ENABLE when adding events with kqueue,
- this might help with OS X, which seems to need it despite documenting
- not to need it (helpfully pointed out by Tilghman Lesher).
- - do not use poll by default on freebsd, it's broken (what isn't
- on freebsd...).
- - allow to embed epoll on kernels >= 2.6.32.
- - configure now prepends -O3, not appends it, so one can still
- override it.
- - ev.pod: greatly expanded the portability section, added a porting
- section, a description of watcher states and made lots of minor fixes.
- - disable poll backend on AIX, the poll header spams the namespace
- and it's not worth working around dead platforms (reported
- and analyzed by Aivars Kalvans).
- - improve header file compatibility of the standalone eventfd code
- in an obscure case.
- - implement EV_AVOID_STDIO option.
- - do not use sscanf to parse linux version number (smaller, faster,
- no sscanf dependency).
- - new EV_CHILD_ENABLE and EV_SIGNAL_ENABLE configurable settings.
- - update libev.m4 HAVE_CLOCK_SYSCALL test for newer glibcs.
- - add section on accept() problems to the manpage.
- - rename EV_TIMEOUT to EV_TIMER.
- - rename ev_loop_count/depth/verify/loop/unloop.
- - remove ev_default_destroy and ev_default_fork.
- - switch to two-digit minor version.
- - work around an apparent gentoo compiler bug.
- - define _DARWIN_UNLIMITED_SELECT. just so.
- - use enum instead of #define for most constants.
- - improve compatibility to older C++ compilers.
- - (experimental) ev_run/ev_default_loop/ev_break/ev_loop_new have now
- default arguments when compiled as C++.
- - enable automake dependency tracking.
- - ev_loop_new no longer leaks memory when loop creation failed.
- - new ev_cleanup watcher type.
- 3.9 Thu Dec 31 07:59:59 CET 2009
- - signalfd is no longer used by default and has to be requested
- explicitly - this means that easy to catch bugs become hard to
- catch race conditions, but the users have spoken.
- - point out the unspecified signal mask in the documentation, and
- that this is a race condition regardless of EV_SIGNALFD.
- - backport inotify code to C89.
- - inotify file descriptors could leak into child processes.
- - ev_stat watchers could keep an errornous extra ref on the loop,
- preventing exit when unregistering all watchers (testcases
- provided by ry@tinyclouds.org).
- - implement EV_WIN32_HANDLE_TO_FD and EV_WIN32_CLOSE_FD configuration
- symbols to make it easier for apps to do their own fd management.
- - support EV_IDLE_ENABLE being disabled in ev++.h
- (patch by Didier Spezia).
- - take advantage of inotify_init1, if available, to set cloexec/nonblock
- on fd creation, to avoid races.
- - the signal handling pipe wasn't always initialised under windows
- (analysed by lekma).
- - changed minimum glibc requirement from glibc 2.9 to 2.7, for
- signalfd.
- - add missing string.h include (Denis F. Latypoff).
- - only replace ev_stat.prev when we detect an actual difference,
- so prev is (almost) always different to attr. this might
- have caused the problems with 04_stat.t.
- - add ev::timer->remaining () method to C++ API.
- 3.8 Sun Aug 9 14:30:45 CEST 2009
- - incompatible change: do not necessarily reset signal handler
- to SIG_DFL when a sighandler is stopped.
- - ev_default_destroy did not properly free or zero some members,
- potentially causing crashes and memory corruption on repeated
- ev_default_destroy/ev_default_loop calls.
- - take advantage of signalfd on GNU/Linux systems.
- - document that the signal mask might be in an unspecified
- state when using libev's signal handling.
- - take advantage of some GNU/Linux calls to set cloexec/nonblock
- on fd creation, to avoid race conditions.
- 3.7 Fri Jul 17 16:36:32 CEST 2009
- - ev_unloop and ev_loop wrongly used a global variable to exit loops,
- instead of using a per-loop variable (bug caught by accident...).
- - the ev_set_io_collect_interval interpretation has changed.
- - add new functionality: ev_set_userdata, ev_userdata,
- ev_set_invoke_pending_cb, ev_set_loop_release_cb,
- ev_invoke_pending, ev_pending_count, together with a long example
- about thread locking.
- - add ev_timer_remaining (as requested by Denis F. Latypoff).
- - add ev_loop_depth.
- - calling ev_unloop in fork/prepare watchers will no longer poll
- for new events.
- - Denis F. Latypoff corrected many typos in example code snippets.
- - honor autoconf detection of EV_USE_CLOCK_SYSCALL, also double-
- check that the syscall number is available before trying to
- use it (reported by ry@tinyclouds).
- - use GetSystemTimeAsFileTime instead of _timeb on windows, for
- slightly higher accuracy.
- - properly declare ev_loop_verify and ev_now_update even when
- !EV_MULTIPLICITY.
- - do not compile in any priority code when EV_MAXPRI == EV_MINPRI.
- - support EV_MINIMAL==2 for a reduced API.
- - actually 0-initialise struct sigaction when installing signals.
- - add section on hibernate and stopped processes to ev_timer docs.
- 3.6 Tue Apr 28 02:49:30 CEST 2009
- - multiple timers becoming ready within an event loop iteration
- will be invoked in the "correct" order now.
- - do not leave the event loop early just because we have no active
- watchers, fixing a problem when embedding a kqueue loop
- that has active kernel events but no registered watchers
- (reported by blacksand blacksand).
- - correctly zero the idx values for arrays, so destroying and
- reinitialising the default loop actually works (patch by
- Malek Hadj-Ali).
- - implement ev_suspend and ev_resume.
- - new EV_CUSTOM revents flag for use by applications.
- - add documentation section about priorites.
- - add a glossary to the dcoumentation.
- - extend the ev_fork description slightly.
- - optimize a jump out of call_pending.
- 3.53 Sun Feb 15 02:38:20 CET 2009
- - fix a bug in event pipe creation on win32 that would cause a
- failed assertion on event loop creation (patch by Malek Hadj-Ali).
- - probe for CLOCK_REALTIME support at runtime as well and fall
- back to gettimeofday if there is an error, to support older
- operating systems with newer header files/libraries.
- - prefer gettimeofday over clock_gettime with USE_CLOCK_SYSCALL
- (default most everywhere), otherwise not.
- 3.52 Wed Jan 7 21:43:02 CET 2009
- - fix compilation of select backend in fd_set mode when NFDBITS is
- missing (to get it to compile on QNX, reported by Rodrigo Campos).
- - better select-nfds handling when select backend is in fd_set mode.
- - diagnose fd_set overruns when select backend is in fd_set mode.
- - due to a thinko, instead of disabling everything but
- select on the borked OS X platform, everything but select was
- allowed (reported by Emanuele Giaquinta).
- - actually verify that local and remote port are matching in
- libev's socketpair emulation, which makes denial-of-service
- attacks harder (but not impossible - it's windows). Make sure
- it even works under vista, which thinks that getpeer/sockname
- should return fantasy port numbers.
- - include "libev" in all assertion messages for potentially
- clearer diagnostics.
- - event_get_version (libevent compatibility) returned
- a useless string instead of the expected version string
- (patch by W.C.A. Wijngaards).
- 3.51 Wed Dec 24 23:00:11 CET 2008
- - fix a bug where an inotify watcher was added twice, causing
- freezes on hash collisions (reported and analysed by Graham Leggett).
- - new config symbol, EV_USE_CLOCK_SYSCALL, to make libev use
- a direct syscall - slower, but no dependency on librt et al.
- - assume negative return values != -1 signals success of port_getn
- (http://cvs.epicsol.org/cgi/viewcvs.cgi/epic5/source/newio.c?rev=1.52)
- (no known failure reports, but it doesn't hurt).
- - fork detection in ev_embed now stops and restarts the watcher
- automatically.
- - EXPERIMENTAL: default the method to operator () in ev++.h,
- to make it nicer to use functors (requested by Benedek László).
- - fixed const object callbacks in ev++.h.
- - replaced loop_ref argument of watcher.set (loop) by a direct
- ev_loop * in ev++.h, to avoid clashes with functor patch.
- - do not try to watch the empty string via inotify.
- - inotify watchers could be leaked under certain circumstances.
- - OS X 10.5 is actually even more broken than earlier versions,
- so fall back to select on that piece of garbage.
- - fixed some weirdness in the ev_embed documentation.
- 3.49 Wed Nov 19 11:26:53 CET 2008
- - ev_stat watchers will now use inotify as a mere hint on
- kernels <2.6.25, or if the filesystem is not in the
- "known to be good" list.
- - better mingw32 compatibility (it's not as borked as native win32)
- (analysed by Roger Pack).
- - include stdio.h in the example program, as too many people are
- confused by the weird C language otherwise. I guess the next thing
- I get told is that the "..." ellipses in the examples don't compile
- with their C compiler.
- 3.48 Thu Oct 30 09:02:37 CET 2008
- - further optimise away the EPOLL_CTL_ADD/MOD combo in the epoll
- backend by assuming the kernel event mask hasn't changed if
- ADD fails with EEXIST.
- - work around spurious event notification bugs in epoll by using
- a 32-bit generation counter. recreate kernel state if we receive
- spurious notifications or unwanted events. this is very costly,
- but I didn't come up with this horrible design.
- - use memset to initialise most arrays now and do away with the
- init functions.
- - expand time-out strategies into a "Be smart about timeouts" section.
- - drop the "struct" from all ev_watcher declarations in the
- documentation and did other clarifications (yeah, it was a mistake
- to have a struct AND a function called ev_loop).
- - fix a bug where ev_default would not initialise the default
- loop again after it was destroyed with ev_default_destroy.
- - rename syserr to ev_syserr to avoid name clashes when embedding,
- do similar changes for event.c.
- 3.45 Tue Oct 21 21:59:26 CEST 2008
- - disable inotify usage on linux <2.6.25, as it is broken
- (reported by Yoann Vandoorselaere).
- - ev_stat erroneously would try to add inotify watchers
- even when inotify wasn't available (this should only
- have a performance impact).
- - ev_once now passes both timeout and io to the callback if both
- occur concurrently, instead of giving timeouts precedence.
- - disable EV_USE_INOTIFY when sys/inotify.h is too old.
- 3.44 Mon Sep 29 05:18:39 CEST 2008
- - embed watchers now automatically invoke ev_loop_fork on the
- embedded loop when the parent loop forks.
- - new function: ev_now_update (loop).
- - verify_watcher was not marked static.
- - improve the "associating..." manpage section.
- - documentation tweaks here and there.
- 3.43 Sun Jul 6 05:34:41 CEST 2008
- - include more include files on windows to get struct _stati64
- (reported by Chris Hulbert, but doesn't quite fix his issue).
- - add missing #include <io.h> in ev.c on windows (reported by
- Matt Tolton).
- 3.42 Tue Jun 17 12:12:07 CEST 2008
- - work around yet another windows bug: FD_SET actually adds fd's
- multiple times to the fd_*SET*, despite official MSN docs claiming
- otherwise. Reported and well-analysed by Matt Tolton.
- - define NFDBITS to 0 when EV_SELECT_IS_WINSOCKET to make it compile
- (reported any analysed by Chris Hulbert).
- - fix a bug in ev_ebadf (this function is only used to catch
- programming errors in the libev user). reported by Matt Tolton.
- - fix a bug in fd_intern on win32 (could lead to compile errors
- under some circumstances, but would work correctly if it compiles).
- reported by Matt Tolton.
- - (try to) work around missing lstat on windows.
- - pass in the write fd set as except fd set under windows. windows
- is so uncontrollably lame that it requires this. this means that
- switching off oobinline is not supported (but tcp/ip doesn't
- have oob, so that would be stupid anyways.
- - use posix module symbol to auto-detect monotonic clock presence
- and some other default values.
- 3.41 Fri May 23 18:42:54 CEST 2008
- - work around an obscure bug in winsocket select: if you
- provide only empty fd sets then select returns WSAEINVAL. how sucky.
- - improve timer scheduling stability and reduce use of time_epsilon.
- - use 1-based 2-heap for EV_MINIMAL, simplifies code, reduces
- codesize and makes for better cache-efficiency.
- - use 3-based 4-heap for !EV_MINIMAL. this makes better use
- of cpu cache lines and gives better growth behaviour than
- 2-based heaps.
- - cache timestamp within heap for !EV_MINIMAL, to avoid random
- memory accesses.
- - document/add EV_USE_4HEAP and EV_HEAP_CACHE_AT.
- - fix a potential aliasing issue in ev_timer_again.
- - add/document ev_periodic_at, retract direct access to ->at.
- - improve ev_stat docs.
- - add portability requirements section.
- - fix manpage headers etc.
- - normalise WSA error codes to lower range on windows.
- - add consistency check code that can be called automatically
- or on demand to check for internal structures (ev_loop_verify).
- 3.31 Wed Apr 16 20:45:04 CEST 2008
- - added last minute fix for ev_poll.c by Brandon Black.
- 3.3 Wed Apr 16 19:04:10 CEST 2008
- - event_base_loopexit should return 0 on success
- (W.C.A. Wijngaards).
- - added linux eventfd support.
- - try to autodetect epoll and inotify support
- by libc header version if not using autoconf.
- - new symbols: EV_DEFAULT_UC and EV_DEFAULT_UC_.
- - declare functions defined in ev.h as inline if
- C99 or gcc are available.
- - enable inlining with gcc versions 2 and 3.
- - work around broken poll implementations potentially
- not clearing revents field in ev_poll (Brandon Black)
- (no such systems are known at this time).
- - work around a bug in realloc on openbsd and darwin,
- also makes the erroneous valgrind complaints
- go away (noted by various people).
- - fix ev_async_pending, add c++ wrapper for ev_async
- (based on patch sent by Johannes Deisenhofer).
- - add sensible set method to ev::embed.
- - made integer constants type int in ev.h.
- 3.2 Wed Apr 2 17:11:19 CEST 2008
- - fix a 64 bit overflow issue in the select backend,
- by using fd_mask instead of int for the mask.
- - rename internal sighandler to avoid clash with very old perls.
- - entering ev_loop will not clear the ONESHOT or NONBLOCKING
- flags of any outer loops anymore.
- - add ev_async_pending.
- 3.1 Thu Mar 13 13:45:22 CET 2008
- - implement ev_async watchers.
- - only initialise signal pipe on demand.
- - make use of sig_atomic_t configurable.
- - improved documentation.
- 3.0 Mon Jan 28 13:14:47 CET 2008
- - API/ABI bump to version 3.0.
- - ev++.h includes "ev.h" by default now, not <ev.h>.
- - slightly improved documentation.
- - speed up signal detection after a fork.
- - only optionally return trace status changed in ev_child
- watchers.
- - experimental (and undocumented) loop wrappers for ev++.h.
- 2.01 Tue Dec 25 08:04:41 CET 2007
- - separate Changes file.
- - fix ev_path_set => ev_stat_set typo.
- - remove event_compat.h from the libev tarball.
- - change how include files are found.
- - doc updates.
- - update licenses, explicitly allow for GPL relicensing.
- 2.0 Sat Dec 22 17:47:03 CET 2007
- - new ev_sleep, ev_set_(io|timeout)_collect_interval.
- - removed epoll from embeddable fd set.
- - fix embed watchers.
- - renamed ev_embed.loop to other.
- - added exported Symbol tables.
- - undefine member wrapper macros at the end of ev.c.
- - respect EV_H in ev++.h.
- 1.86 Tue Dec 18 02:36:57 CET 2007
- - fix memleak on loop destroy (not relevant for perl).
- 1.85 Fri Dec 14 20:32:40 CET 2007
- - fix some aliasing issues w.r.t. timers and periodics
- (not relevant for perl).
- (for historic versions refer to EV/Changes, found in the Perl interface)
- 0.1 Wed Oct 31 21:31:48 CET 2007
- - original version; hacked together in <24h.