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Comparing libev/Changes (file contents):
Revision 1.94 by root, Wed Dec 24 22:05:18 2008 UTC vs.
Revision 1.360 by root, Wed Jan 22 13:06:53 2020 UTC

1Revision history for libev, a high-performance and full-featured event loop. 1Revision history for libev, a high-performance and full-featured event loop.
2
3TODO: for next ABI/API change, consider moving EV__IOFDSSET into io->fd instead and provide a getter.
4TODO: document EV_TSTAMP_T
5
6TODO: maybe allow events = 0 for io watchers
7 - the 4.31 timerfd code wrongly changes the priority of the signal
8 fd watcher, which is usually harmless unless signal fds are
9 also used (found via cpan tester service).
10 - the documentation wrongly claimed that user may modify fd and events
11 members in io watchers when the wqatcher was stopped
12 (found by b_jonas).
13 - new ev_io_modify mutator which changes only the events member,
14 which can be faster.
15 - officially allow a zero events mask for io watchers. this should
16 work with older libev versions as well but was not officially
17 allowed before.
18 - do not wake up every minute when timerfd is used to detect timejumps.
19 - support a lot more "uncommon" compile time configurations,
20 such as ev_embed enabled but ev_timer disabled.
21 - the linux aio backend is no longer compiled in by default.
22 - update to libecb version 0x00010008.
23
244.31 Fri Dec 20 21:58:29 CET 2019
25 - handle backends with minimum wait time a bit better by not
26 waiting in the presence of already-expired timers
27 (behaviour reported by Felipe Gasper).
28 - new feature: use timerfd to detect timejumps quickly,
29 can be disabled with the new EVFLAG_NOTIMERFD loop flag.
30 - document EV_USE_SIGNALFD feature macro.
31
324.30 (EV only)
33 - change non-autoconf test for __kernel_rwf_t by testing
34 LINUX_VERSION_CODE, the most direct test I could find.
35 - fix a bug in the io_uring backend that polled the wrong
36 backend fd, causing it to not work in many cases.
37
384.29 (EV only)
39 - add io uring autoconf and non-autoconf detection.
40 - disable io_uring when some header files are too old.
41
424.28 (EV only)
43 - linuxaio backend resulted in random memory corruption
44 when loop is forked.
45 - linuxaio backend might have tried to cancel an iocb
46 multiple times (was unable to trigger this).
47 - linuxaio backend now employs a generation counter to
48 avoid handling spurious events from cancelled requests.
49 - io_cancel can return EINTR, deal with it. also, assume
50 io_submit also returns EINTR.
51 - fix some other minor bugs in linuxaio backend.
52 - ev_tstamp type can now be overriden by defining EV_TSTAMP_T.
53 - cleanup: replace expect_true/false and noinline by their
54 libecb counterparts.
55 - move syscall infrastructure from ev_linuxaio.c to ev.c.
56 - prepare io_uring integration.
57 - tweak ev_floor.
58 - epoll, poll, win32 Sleep and other places that use millisecond
59 reslution now all try to round up times.
60 - solaris port backend didn't compile.
61 - abstract time constants into their macros, for more flexibility.
62
634.27 Thu Jun 27 22:43:44 CEST 2019
64 - linux aio backend almost completely rewritten to work around its
65 limitations.
66 - linux aio backend now requires linux 4.19+.
67 - epoll backend now mandatory for linux aio backend.
68 - fail assertions more aggressively on invalid fd's detected
69 in the event loop, do not just silently fd_kill in case of
70 user error.
71 - ev_io_start/ev_io_stop now verify the watcher fd using
72 a syscall when EV_VERIFY is 2 or higher.
73
744.26 (EV only)
75 - update to libecb 0x00010006.
76 - new experimental linux aio backend (linux 4.18+).
77 - removed redundant 0-ptr check in ev_once.
78 - updated/extended ev_set_allocator documentation.
79 - replaced EMPTY2 macro by array_needsize_noinit.
80 - minor code cleanups.
81 - epoll backend now uses epoll_create1 also after fork.
82
834.25 Fri Dec 21 07:49:20 CET 2018
84 - INCOMPATIBLE CHANGE: EV_THROW was renamed to EV_NOEXCEPT
85 (EV_THROW still provided) and now uses noexcept on C++11 or newer.
86 - move the darwin select workaround higher in ev.c, as newer versions of
87 darwin managed to break their broken select even more.
88 - ANDROID => __ANDROID__ (reported by enh@google.com).
89 - disable epoll_create1 on android because it has broken header files
90 and google is unwilling to fix them (reported by enh@google.com).
91 - avoid a minor compilation warning on win32.
92 - c++: remove deprecated dynamic throw() specifications.
93 - c++: improve the (unsupported) bad_loop exception class.
94 - backport perl ev_periodic example to C, untested.
95 - update libecb, biggets change is to include a memory fence
96 in ECB_MEMORY_FENCE_RELEASE on x86/amd64.
97 - minor autoconf/automake modernisation.
98
994.24 Wed Dec 28 05:19:55 CET 2016
100 - bump version to 4.24, as the release tarball inexplicably
101 didn't have the right version in ev.h, even though the cvs-tagged
102 version did have the right one (reported by Ales Teska).
103
1044.23 Wed Nov 16 18:23:41 CET 2016
105 - move some declarations at the beginning to help certain retarded
106 microsoft compilers, even though their documentation claims
107 otherwise (reported by Ruslan Osmanov).
108
1094.22 Sun Dec 20 22:11:50 CET 2015
110 - when epoll detects unremovable fds in the fd set, rebuild
111 only the epoll descriptor, not the signal pipe, to avoid
112 SIGPIPE in ev_async_send. This doesn't solve it on fork,
113 so document what needs to be done in ev_loop_fork
114 (analyzed by Benjamin Mahler).
115 - remove superfluous sys/timeb.h include on win32
116 (analyzed by Jason Madden).
117 - updated libecb.
118
1194.20 Sat Jun 20 13:01:43 CEST 2015
120 - prefer noexcept over throw () with C++ 11.
121 - update ecb.h due to incompatibilities with c11.
122 - fix a potential aliasing issue when reading and writing
123 watcher callbacks.
124
1254.19 Thu Sep 25 08:18:25 CEST 2014
126 - ev.h wasn't valid C++ anymore, which tripped compilers other than
127 clang, msvc or gcc (analyzed by Raphael 'kena' Poss). Unfortunately,
128 C++ doesn't support typedefs for function pointers fully, so the affected
129 declarations have to spell out the types each time.
130 - when not using autoconf, tighten the check for clock_gettime and related
131 functionality.
132
1334.18 Fri Sep 5 17:55:26 CEST 2014
134 - events on files were not always generated properly with the
135 epoll backend (testcase by Assaf Inbal).
136 - mark event pipe fd as cloexec after a fork (analyzed by Sami Farin).
137 - (ecb) support m68k, m88k and sh (patch by Miod Vallat).
138 - use a reasonable fallback for EV_NSIG instead of erroring out
139 when we can't detect the signal set size.
140 - in the absence of autoconf, do not use the clock syscall
141 on glibc >= 2.17 (avoids the syscall AND -lrt on systems
142 doing clock_gettime in userspace).
143 - ensure extern "C" function pointers are used for externally-visible
144 loop callbacks (not watcher callbacks yet).
145 - (ecb) work around memory barriers and volatile apparently both being
146 broken in visual studio 2008 and later (analysed and patch by Nicolas Noble).
147
1484.15 Fri Mar 1 12:04:50 CET 2013
149 - destroying a non-default loop would stop the global waitpid
150 watcher (Denis Bilenko).
151 - queueing pending watchers of higher priority from a watcher now invokes
152 them in a timely fashion (reported by Denis Bilenko).
153 - add throw() to all libev functions that cannot throw exceptions, for
154 further code size decrease when compiling for C++.
155 - add throw () to callbacks that must not throw exceptions (allocator,
156 syserr, loop acquire/release, periodic reschedule cbs).
157 - fix event_base_loop return code, add event_get_callback, event_base_new,
158 event_base_get_method calls to improve libevent 1.x emulation and add
159 some libevent 2.x functionality (based on a patch by Jeff Davey).
160 - add more memory fences to fix a bug reported by Jeff Davey. Better
161 be overfenced than underprotected.
162 - ev_run now returns a boolean status (true meaning watchers are
163 still active).
164 - ev_once: undef EV_ERROR in ev_kqueue.c, to avoid clashing with
165 libev's EV_ERROR (reported by 191919).
166 - (ecb) add memory fence support for xlC (Darin McBride).
167 - (ecb) add memory fence support for gcc-mips (Anton Kirilov).
168 - (ecb) add memory fence support for gcc-alpha (Christian Weisgerber).
169 - work around some kernels losing file descriptors by leaking
170 the kqueue descriptor in the child.
171 - work around linux inotify not reporting IN_ATTRIB changes for directories
172 in many cases.
173 - include sys/syscall.h instead of plain syscall.h.
174 - check for io watcher loops in ev_verify, check for the most
175 common reported usage bug in ev_io_start.
176 - choose socket vs. WSASocket at compiletime using EV_USE_WSASOCKET.
177 - always use WSASend/WSARecv directly on windows, hoping that this
178 works in all cases (unlike read/write/send/recv...).
179 - try to detect signals around a fork faster (test program by
180 Denis Bilenko).
181 - work around recent glibc versions that leak memory in realloc.
182 - rename ev::embed::set to ev::embed::set_embed to avoid clashing
183 the watcher base set (loop) method.
184 - rewrite the async/signal pipe logic to always keep a valid fd, which
185 simplifies (and hopefully correctifies :) the race checking
186 on fork, at the cost of one extra fd.
187 - add fat, msdos, jffs2, ramfs, ntfs and btrfs to the list of
188 inotify-supporting filesystems.
189 - move orig_CFLAGS assignment to after AC_INIT, as newer autoconf
190 versions ignore it before
191 (https://bugzilla.redhat.com/show_bug.cgi?id=908096).
192 - add some untested android support.
193 - enum expressions must be of type int (reported by Juan Pablo L).
194
1954.11 Sat Feb 4 19:52:39 CET 2012
196 - INCOMPATIBLE CHANGE: ev_timer_again now clears the pending status, as
197 was documented already, but not implemented in the repeating case.
198 - new compiletime symbols: EV_NO_SMP and EV_NO_THREADS.
199 - fix a race where the workaround against the epoll fork bugs
200 caused signals to not be handled anymore.
201 - correct backend_fudge for most backends, and implement a windows
202 specific workaround to avoid looping because we call both
203 select and Sleep, both with different time resolutions.
204 - document range and guarantees of ev_sleep.
205 - document reasonable ranges for periodics interval and offset.
206 - rename backend_fudge to backend_mintime to avoid future confusion :)
207 - change the default periodic reschedule function to hopefully be more
208 exact and correct even in corner cases or in the far future.
209 - do not rely on -lm anymore: use it when available but use our
210 own floor () if it is missing. This should make it easier to embed,
211 as no external libraries are required.
212 - strategically import macros from libecb and mark rarely-used functions
213 as cache-cold (saving almost 2k code size on typical amd64 setups).
214 - add Symbols.ev and Symbols.event files, that were missing.
215 - fix backend_mintime value for epoll (was 1/1024, is 1/1000 now).
216 - fix #3 "be smart about timeouts" to not "deadlock" when
217 timeout == now, also improve the section overall.
218 - avoid "AVOIDING FINISHING BEFORE RETURNING" idiom.
219 - support new EV_API_STATIC mode to make all libev symbols
220 static.
221 - supply default CFLAGS of -g -O3 with gcc when original CFLAGS
222 were empty.
223
2244.04 Wed Feb 16 09:01:51 CET 2011
225 - fix two problems in the native win32 backend, where reuse of fd's
226 with different underlying handles caused handles not to be removed
227 or added to the select set (analyzed and tested by Bert Belder).
228 - do no rely on ceil() in ev_e?poll.c.
229 - backport libev to HP-UX versions before 11 v3.
230 - configure did not detect nanosleep and clock_gettime properly when
231 they are available in the libc (as opposed to -lrt).
232
2334.03 Tue Jan 11 14:37:25 CET 2011
234 - officially support polling files with all backends.
235 - support files, /dev/zero etc. the same way as select in the epoll
236 backend, by generating events on our own.
237 - ports backend: work around solaris bug 6874410 and many related ones
238 (EINTR, maybe more), with no performance loss (note that the solaris
239 bug report is actually wrong, reality is far more bizarre and broken
240 than that).
241 - define EV_READ/EV_WRITE as macros in event.h, as some programs use
242 #ifdef to test for them.
243 - new (experimental) function: ev_feed_signal.
244 - new (to become default) EVFLAG_NOSIGMASK flag.
245 - new EVBACKEND_MASK symbol.
246 - updated COMMON IDIOMS SECTION.
247
2484.01 Fri Nov 5 21:51:29 CET 2010
249 - automake fucked it up, apparently, --add-missing -f is not quite enough
250 to make it update its files, so 4.00 didn't install ev++.h and
251 event.h on make install. grrr.
252 - ev_loop(count|depth) didn't return anything (Robin Haberkorn).
253 - change EV_UNDEF to 0xffffffff to silence some overzealous compilers.
254 - use "(libev) " prefix for all libev error messages now.
255
2564.00 Mon Oct 25 12:32:12 CEST 2010
257 - "PORTING FROM LIBEV 3.X TO 4.X" (in ev.pod) is recommended reading.
258 - ev_embed_stop did not correctly stop the watcher (very good
259 testcase by Vladimir Timofeev).
260 - ev_run will now always update the current loop time - it erroneously
261 didn't when idle watchers were active, causing timers not to fire.
262 - fix a bug where a timeout of zero caused the timer not to fire
263 in the libevent emulation (testcase by Péter Szabó).
264 - applied win32 fixes by Michael Lenaghan (also James Mansion).
265 - replace EV_MINIMAL by EV_FEATURES.
266 - prefer EPOLL_CTL_ADD over EPOLL_CTL_MOD in some more cases, as it
267 seems the former is *much* faster than the latter.
268 - linux kernel version detection (for inotify bug workarounds)
269 did not work properly.
270 - reduce the number of spurious wake-ups with the ports backend.
271 - remove dependency on sys/queue.h on freebsd (patch by Vanilla Hsu).
272 - do async init within ev_async_start, not ev_async_set, which avoids
273 an API quirk where the set function must be called in the C++ API
274 even when there is nothing to set.
275 - add (undocumented) EV_ENABLE when adding events with kqueue,
276 this might help with OS X, which seems to need it despite documenting
277 not to need it (helpfully pointed out by Tilghman Lesher).
278 - do not use poll by default on freebsd, it's broken (what isn't
279 on freebsd...).
280 - allow to embed epoll on kernels >= 2.6.32.
281 - configure now prepends -O3, not appends it, so one can still
282 override it.
283 - ev.pod: greatly expanded the portability section, added a porting
284 section, a description of watcher states and made lots of minor fixes.
285 - disable poll backend on AIX, the poll header spams the namespace
286 and it's not worth working around dead platforms (reported
287 and analyzed by Aivars Kalvans).
288 - improve header file compatibility of the standalone eventfd code
289 in an obscure case.
290 - implement EV_AVOID_STDIO option.
291 - do not use sscanf to parse linux version number (smaller, faster,
292 no sscanf dependency).
293 - new EV_CHILD_ENABLE and EV_SIGNAL_ENABLE configurable settings.
294 - update libev.m4 HAVE_CLOCK_SYSCALL test for newer glibcs.
295 - add section on accept() problems to the manpage.
296 - rename EV_TIMEOUT to EV_TIMER.
297 - rename ev_loop_count/depth/verify/loop/unloop.
298 - remove ev_default_destroy and ev_default_fork.
299 - switch to two-digit minor version.
300 - work around an apparent gentoo compiler bug.
301 - define _DARWIN_UNLIMITED_SELECT. just so.
302 - use enum instead of #define for most constants.
303 - improve compatibility to older C++ compilers.
304 - (experimental) ev_run/ev_default_loop/ev_break/ev_loop_new have now
305 default arguments when compiled as C++.
306 - enable automake dependency tracking.
307 - ev_loop_new no longer leaks memory when loop creation failed.
308 - new ev_cleanup watcher type.
309
3103.9 Thu Dec 31 07:59:59 CET 2009
311 - signalfd is no longer used by default and has to be requested
312 explicitly - this means that easy to catch bugs become hard to
313 catch race conditions, but the users have spoken.
314 - point out the unspecified signal mask in the documentation, and
315 that this is a race condition regardless of EV_SIGNALFD.
316 - backport inotify code to C89.
317 - inotify file descriptors could leak into child processes.
318 - ev_stat watchers could keep an erroneous extra ref on the loop,
319 preventing exit when unregistering all watchers (testcases
320 provided by ry@tinyclouds.org).
321 - implement EV_WIN32_HANDLE_TO_FD and EV_WIN32_CLOSE_FD configuration
322 symbols to make it easier for apps to do their own fd management.
323 - support EV_IDLE_ENABLE being disabled in ev++.h
324 (patch by Didier Spezia).
325 - take advantage of inotify_init1, if available, to set cloexec/nonblock
326 on fd creation, to avoid races.
327 - the signal handling pipe wasn't always initialised under windows
328 (analysed by lekma).
329 - changed minimum glibc requirement from glibc 2.9 to 2.7, for
330 signalfd.
331 - add missing string.h include (Denis F. Latypoff).
332 - only replace ev_stat.prev when we detect an actual difference,
333 so prev is (almost) always different to attr. this might
334 have caused the problems with 04_stat.t.
335 - add ev::timer->remaining () method to C++ API.
336
3373.8 Sun Aug 9 14:30:45 CEST 2009
338 - incompatible change: do not necessarily reset signal handler
339 to SIG_DFL when a sighandler is stopped.
340 - ev_default_destroy did not properly free or zero some members,
341 potentially causing crashes and memory corruption on repeated
342 ev_default_destroy/ev_default_loop calls.
343 - take advantage of signalfd on GNU/Linux systems.
344 - document that the signal mask might be in an unspecified
345 state when using libev's signal handling.
346 - take advantage of some GNU/Linux calls to set cloexec/nonblock
347 on fd creation, to avoid race conditions.
348
3493.7 Fri Jul 17 16:36:32 CEST 2009
350 - ev_unloop and ev_loop wrongly used a global variable to exit loops,
351 instead of using a per-loop variable (bug caught by accident...).
352 - the ev_set_io_collect_interval interpretation has changed.
353 - add new functionality: ev_set_userdata, ev_userdata,
354 ev_set_invoke_pending_cb, ev_set_loop_release_cb,
355 ev_invoke_pending, ev_pending_count, together with a long example
356 about thread locking.
357 - add ev_timer_remaining (as requested by Denis F. Latypoff).
358 - add ev_loop_depth.
359 - calling ev_unloop in fork/prepare watchers will no longer poll
360 for new events.
361 - Denis F. Latypoff corrected many typos in example code snippets.
362 - honor autoconf detection of EV_USE_CLOCK_SYSCALL, also double-
363 check that the syscall number is available before trying to
364 use it (reported by ry@tinyclouds).
365 - use GetSystemTimeAsFileTime instead of _timeb on windows, for
366 slightly higher accuracy.
367 - properly declare ev_loop_verify and ev_now_update even when
368 !EV_MULTIPLICITY.
369 - do not compile in any priority code when EV_MAXPRI == EV_MINPRI.
370 - support EV_MINIMAL==2 for a reduced API.
371 - actually 0-initialise struct sigaction when installing signals.
372 - add section on hibernate and stopped processes to ev_timer docs.
373
3743.6 Tue Apr 28 02:49:30 CEST 2009
375 - multiple timers becoming ready within an event loop iteration
376 will be invoked in the "correct" order now.
377 - do not leave the event loop early just because we have no active
378 watchers, fixing a problem when embedding a kqueue loop
379 that has active kernel events but no registered watchers
380 (reported by blacksand blacksand).
381 - correctly zero the idx values for arrays, so destroying and
382 reinitialising the default loop actually works (patch by
383 Malek Hadj-Ali).
384 - implement ev_suspend and ev_resume.
385 - new EV_CUSTOM revents flag for use by applications.
386 - add documentation section about priorities.
387 - add a glossary to the documentation.
388 - extend the ev_fork description slightly.
389 - optimize a jump out of call_pending.
390
3913.53 Sun Feb 15 02:38:20 CET 2009
392 - fix a bug in event pipe creation on win32 that would cause a
393 failed assertion on event loop creation (patch by Malek Hadj-Ali).
394 - probe for CLOCK_REALTIME support at runtime as well and fall
395 back to gettimeofday if there is an error, to support older
396 operating systems with newer header files/libraries.
397 - prefer gettimeofday over clock_gettime with USE_CLOCK_SYSCALL
398 (default most everywhere), otherwise not.
399
4003.52 Wed Jan 7 21:43:02 CET 2009
401 - fix compilation of select backend in fd_set mode when NFDBITS is
402 missing (to get it to compile on QNX, reported by Rodrigo Campos).
403 - better select-nfds handling when select backend is in fd_set mode.
404 - diagnose fd_set overruns when select backend is in fd_set mode.
405 - due to a thinko, instead of disabling everything but
406 select on the borked OS X platform, everything but select was
407 allowed (reported by Emanuele Giaquinta).
408 - actually verify that local and remote port are matching in
409 libev's socketpair emulation, which makes denial-of-service
410 attacks harder (but not impossible - it's windows). Make sure
411 it even works under vista, which thinks that getpeer/sockname
412 should return fantasy port numbers.
413 - include "libev" in all assertion messages for potentially
414 clearer diagnostics.
415 - event_get_version (libevent compatibility) returned
416 a useless string instead of the expected version string
417 (patch by W.C.A. Wijngaards).
2 418
33.51 Wed Dec 24 23:00:11 CET 2008 4193.51 Wed Dec 24 23:00:11 CET 2008
4 - fix a bug where an inotify watcher was added twice, causing 420 - fix a bug where an inotify watcher was added twice, causing
5 freezes on hash collisions (reported and analysed by Graham Leggett). 421 freezes on hash collisions (reported and analysed by Graham Leggett).
6 - new config symbol, EV_USE_CLOCK_SYSCALL, to make libev use 422 - new config symbol, EV_USE_CLOCK_SYSCALL, to make libev use
52 do similar changes for event.c. 468 do similar changes for event.c.
53 469
543.45 Tue Oct 21 21:59:26 CEST 2008 4703.45 Tue Oct 21 21:59:26 CEST 2008
55 - disable inotify usage on linux <2.6.25, as it is broken 471 - disable inotify usage on linux <2.6.25, as it is broken
56 (reported by Yoann Vandoorselaere). 472 (reported by Yoann Vandoorselaere).
57 - ev_stat errornously would try to add inotify watchers 473 - ev_stat erroneously would try to add inotify watchers
58 even when inotify wasn't available (this should only 474 even when inotify wasn't available (this should only
59 have a performance impact). 475 have a performance impact).
60 - ev_once now passes both timeout and io to the callback if both 476 - ev_once now passes both timeout and io to the callback if both
61 occur concurrently, instead of giving timeouts precedence. 477 occur concurrently, instead of giving timeouts precedence.
62 - disable EV_USE_INOTIFY when sys/inotify.h is too old. 478 - disable EV_USE_INOTIFY when sys/inotify.h is too old.
130 - enable inlining with gcc versions 2 and 3. 546 - enable inlining with gcc versions 2 and 3.
131 - work around broken poll implementations potentially 547 - work around broken poll implementations potentially
132 not clearing revents field in ev_poll (Brandon Black) 548 not clearing revents field in ev_poll (Brandon Black)
133 (no such systems are known at this time). 549 (no such systems are known at this time).
134 - work around a bug in realloc on openbsd and darwin, 550 - work around a bug in realloc on openbsd and darwin,
135 also makes the errornous valgrind complaints 551 also makes the erroneous valgrind complaints
136 go away (noted by various people). 552 go away (noted by various people).
137 - fix ev_async_pending, add c++ wrapper for ev_async 553 - fix ev_async_pending, add c++ wrapper for ev_async
138 (based on patch sent by Johannes Deisenhofer. 554 (based on patch sent by Johannes Deisenhofer).
139 - add sensible set method to ev::embed. 555 - add sensible set method to ev::embed.
140 - made integer constants type int in ev.h. 556 - made integer constants type int in ev.h.
141 557
1423.2 Wed Apr 2 17:11:19 CEST 2008 5583.2 Wed Apr 2 17:11:19 CEST 2008
143 - fix a 64 bit overflow issue in the select backend, 559 - fix a 64 bit overflow issue in the select backend,

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