Revision history for libev, a high-performance and full-featured event loop.
-TODO: ev_walk
-TODO: signal handling per loop
-TODO: signalfd
+ - ANDROID => __ANDROID__ (reported by enh@google.com).
+ - disable epoll_create1 on android because it has broken header files
+ and google is unwilling to fix them (reported by enh@google.com).
-TODO: document signalfd procmask
+4.24 Wed Dec 28 05:19:55 CET 2016
+ - bump version to 4.24, as the release tarball inexplicably
+ didn't have the right version in ev.h, even though the cvs-tagged
+ version did have the right one (reported by Ales Teska).
+
+4.23 Wed Nov 16 18:23:41 CET 2016
+ - move some declarations at the beginning to help certain retarded
+ microsoft compilers, even though their documentation claims
+ otherwise (reported by Ruslan Osmanov).
+
+4.22 Sun Dec 20 22:11:50 CET 2015
+ - when epoll detects unremovable fds in the fd set, rebuild
+ only the epoll descriptor, not the signal pipe, to avoid
+ SIGPIPE in ev_async_send. This doesn't solve it on fork,
+ so document what needs to be done in ev_loop_fork
+ (analyzed by Benjamin Mahler).
+ - remove superfluous sys/timeb.h include on win32
+ (analyzed by Jason Madden).
+ - updated libecb.
+
+4.20 Sat Jun 20 13:01:43 CEST 2015
+ - prefer noexcept over throw () with C++ 11.
+ - update ecb.h due to incompatibilities with c11.
+ - fix a potential aliasing issue when reading and writing
+ watcher callbacks.
+
+4.19 Thu Sep 25 08:18:25 CEST 2014
+ - ev.h wasn't valid C++ anymore, which tripped compilers other than
+ clang, msvc or gcc (analyzed by Raphael 'kena' Poss). Unfortunately,
+ C++ doesn't support typedefs for function pointers fully, so the affected
+ declarations have to spell out the types each time.
+ - when not using autoconf, tighten the check for clock_gettime and related
+ functionality.
+
+4.18 Fri Sep 5 17:55:26 CEST 2014
+ - events on files were not always generated properly with the
+ epoll backend (testcase by Assaf Inbal).
+ - mark event pipe fd as cloexec after a fork (analyzed by Sami Farin).
+ - (ecb) support m68k, m88k and sh (patch by Miod Vallat).
+ - use a reasonable fallback for EV_NSIG instead of erroring out
+ when we can't detect the signal set size.
+ - in the absence of autoconf, do not use the clock syscall
+ on glibc >= 2.17 (avoids the syscall AND -lrt on systems
+ doing clock_gettime in userspace).
+ - ensure extern "C" function pointers are used for externally-visible
+ loop callbacks (not watcher callbacks yet).
+ - (ecb) work around memory barriers and volatile apparently both being
+ broken in visual studio 2008 and later (analysed and patch by Nicolas Noble).
+
+4.15 Fri Mar 1 12:04:50 CET 2013
+ - destroying a non-default loop would stop the global waitpid
+ watcher (Denis Bilenko).
+ - queueing pending watchers of higher priority from a watcher now invokes
+ them in a timely fashion (reported by Denis Bilenko).
+ - add throw() to all libev functions that cannot throw exceptions, for
+ further code size decrease when compiling for C++.
+ - add throw () to callbacks that must not throw exceptions (allocator,
+ syserr, loop acquire/release, periodic reschedule cbs).
+ - fix event_base_loop return code, add event_get_callback, event_base_new,
+ event_base_get_method calls to improve libevent 1.x emulation and add
+ some libevent 2.x functionality (based on a patch by Jeff Davey).
+ - add more memory fences to fix a bug reported by Jeff Davey. Better
+ be overfenced than underprotected.
+ - ev_run now returns a boolean status (true meaning watchers are
+ still active).
+ - ev_once: undef EV_ERROR in ev_kqueue.c, to avoid clashing with
+ libev's EV_ERROR (reported by 191919).
+ - (ecb) add memory fence support for xlC (Darin McBride).
+ - (ecb) add memory fence support for gcc-mips (Anton Kirilov).
+ - (ecb) add memory fence support for gcc-alpha (Christian Weisgerber).
+ - work around some kernels losing file descriptors by leaking
+ the kqueue descriptor in the child.
+ - work around linux inotify not reporting IN_ATTRIB changes for directories
+ in many cases.
+ - include sys/syscall.h instead of plain syscall.h.
+ - check for io watcher loops in ev_verify, check for the most
+ common reported usage bug in ev_io_start.
+ - choose socket vs. WSASocket at compiletime using EV_USE_WSASOCKET.
+ - always use WSASend/WSARecv directly on windows, hoping that this
+ works in all cases (unlike read/write/send/recv...).
+ - try to detect signals around a fork faster (test program by
+ Denis Bilenko).
+ - work around recent glibc versions that leak memory in realloc.
+ - rename ev::embed::set to ev::embed::set_embed to avoid clashing
+ the watcher base set (loop) method.
+ - rewrite the async/signal pipe logic to always keep a valid fd, which
+ simplifies (and hopefully correctifies :) the race checking
+ on fork, at the cost of one extra fd.
+ - add fat, msdos, jffs2, ramfs, ntfs and btrfs to the list of
+ inotify-supporting filesystems.
+ - move orig_CFLAGS assignment to after AC_INIT, as newer autoconf
+ versions ignore it before
+ (https://bugzilla.redhat.com/show_bug.cgi?id=908096).
+ - add some untested android support.
+ - enum expressions must be of type int (reported by Juan Pablo L).
+
+4.11 Sat Feb 4 19:52:39 CET 2012
+ - INCOMPATIBLE CHANGE: ev_timer_again now clears the pending status, as
+ was documented already, but not implemented in the repeating case.
+ - new compiletime symbols: EV_NO_SMP and EV_NO_THREADS.
+ - fix a race where the workaround against the epoll fork bugs
+ caused signals to not be handled anymore.
+ - correct backend_fudge for most backends, and implement a windows
+ specific workaround to avoid looping because we call both
+ select and Sleep, both with different time resolutions.
+ - document range and guarantees of ev_sleep.
+ - document reasonable ranges for periodics interval and offset.
+ - rename backend_fudge to backend_mintime to avoid future confusion :)
+ - change the default periodic reschedule function to hopefully be more
+ exact and correct even in corner cases or in the far future.
+ - do not rely on -lm anymore: use it when available but use our
+ own floor () if it is missing. This should make it easier to embed,
+ as no external libraries are required.
+ - strategically import macros from libecb and mark rarely-used functions
+ as cache-cold (saving almost 2k code size on typical amd64 setups).
+ - add Symbols.ev and Symbols.event files, that were missing.
+ - fix backend_mintime value for epoll (was 1/1024, is 1/1000 now).
+ - fix #3 "be smart about timeouts" to not "deadlock" when
+ timeout == now, also improve the section overall.
+ - avoid "AVOIDING FINISHING BEFORE RETURNING" idiom.
+ - support new EV_API_STATIC mode to make all libev symbols
+ static.
+ - supply default CFLAGS of -g -O3 with gcc when original CFLAGS
+ were empty.
+
+4.04 Wed Feb 16 09:01:51 CET 2011
+ - fix two problems in the native win32 backend, where reuse of fd's
+ with different underlying handles caused handles not to be removed
+ or added to the select set (analyzed and tested by Bert Belder).
+ - do no rely on ceil() in ev_e?poll.c.
+ - backport libev to HP-UX versions before 11 v3.
+ - configure did not detect nanosleep and clock_gettime properly when
+ they are available in the libc (as opposed to -lrt).
+
+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 erroneous 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,
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.
+ - add documentation section about priorities.
+ - add a glossary to the documentation.
- extend the ev_fork description slightly.
- optimize a jump out of call_pending.
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 errornously would try to add inotify watchers
+ - 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
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 errornous valgrind complaints
+ 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.
+ (based on patch sent by Johannes Deisenhofer).
- add sensible set method to ev::embed.
- made integer constants type int in ev.h.
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