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Comparing libev/Changes (file contents):
Revision 1.127 by root, Wed Jul 15 16:08:24 2009 UTC vs.
Revision 1.356 by root, Tue Jan 21 23:52:35 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 2
3TODO: ev_walk 3TODO: revisit 59.x timer in the light of modern powersaving
4TODO: remain 4TODO: ^ maybe just increase it when timerfd, modern linux only thing that counts?
5TODO: EV_MINIMAL 5TODO: document EV_TSTAMP_T
6 6
7 - new functionality: ev_set_userdata, ev_userdata, 7TODO: add ev_io_set_events, or ev_io_modify, or ev_io_change, or..., without IOFDSET
8 ev_set_invoke_pending_cb, ev_set_loop_release_cb, 8 - the 4.31 timerfd code wrongly changes the priority of the signal
9 ev_invoke_pending, together with a long example about thread 9 fd watcher, which is usually harmless unless signal fds are
10 locking. 10 also used (found via cpan tester service).
11 - do not wake up every minute when timerfd is used to detect timejumps.
12 - support a lot more "uncommon" compile time configurations,
13 such as ev_embed enabled but ev_timer disabled.
14 - the linux aio backend is no longer compiled in by default.
15 - update to libecb version 0x00010008.
16
174.31 Fri Dec 20 21:58:29 CET 2019
18 - handle backends with minimum wait time a bit better by not
19 waiting in the presence of already-expired timers
20 (behaviour reported by Felipe Gasper).
21 - new feature: use timerfd to detect timejumps quickly,
22 can be disabled with the new EVFLAG_NOTIMERFD loop flag.
23 - document EV_USE_SIGNALFD feature macro.
24
254.30 (EV only)
26 - change non-autoconf test for __kernel_rwf_t by testing
27 LINUX_VERSION_CODE, the most direct test I could find.
28 - fix a bug in the io_uring backend that polled the wrong
29 backend fd, causing it to not work in many cases.
30
314.29 (EV only)
32 - add io uring autoconf and non-autoconf detection.
33 - disable io_uring when some header files are too old.
34
354.28 (EV only)
36 - linuxaio backend resulted in random memory corruption
37 when loop is forked.
38 - linuxaio backend might have tried to cancel an iocb
39 multiple times (was unable to trigger this).
40 - linuxaio backend now employs a generation counter to
41 avoid handling spurious events from cancelled requests.
42 - io_cancel can return EINTR, deal with it. also, assume
43 io_submit also returns EINTR.
44 - fix some other minor bugs in linuxaio backend.
45 - ev_tstamp type can now be overriden by defining EV_TSTAMP_T.
46 - cleanup: replace expect_true/false and noinline by their
47 libecb counterparts.
48 - move syscall infrastructure from ev_linuxaio.c to ev.c.
49 - prepare io_uring integration.
50 - tweak ev_floor.
51 - epoll, poll, win32 Sleep and other places that use millisecond
52 reslution now all try to round up times.
53 - solaris port backend didn't compile.
54 - abstract time constants into their macros, for more flexibility.
55
564.27 Thu Jun 27 22:43:44 CEST 2019
57 - linux aio backend almost completely rewritten to work around its
58 limitations.
59 - linux aio backend now requires linux 4.19+.
60 - epoll backend now mandatory for linux aio backend.
61 - fail assertions more aggressively on invalid fd's detected
62 in the event loop, do not just silently fd_kill in case of
63 user error.
64 - ev_io_start/ev_io_stop now verify the watcher fd using
65 a syscall when EV_VERIFY is 2 or higher.
66
674.26 (EV only)
68 - update to libecb 0x00010006.
69 - new experimental linux aio backend (linux 4.18+).
70 - removed redundant 0-ptr check in ev_once.
71 - updated/extended ev_set_allocator documentation.
72 - replaced EMPTY2 macro by array_needsize_noinit.
73 - minor code cleanups.
74 - epoll backend now uses epoll_create1 also after fork.
75
764.25 Fri Dec 21 07:49:20 CET 2018
77 - INCOMPATIBLE CHANGE: EV_THROW was renamed to EV_NOEXCEPT
78 (EV_THROW still provided) and now uses noexcept on C++11 or newer.
79 - move the darwin select workaround higher in ev.c, as newer versions of
80 darwin managed to break their broken select even more.
81 - ANDROID => __ANDROID__ (reported by enh@google.com).
82 - disable epoll_create1 on android because it has broken header files
83 and google is unwilling to fix them (reported by enh@google.com).
84 - avoid a minor compilation warning on win32.
85 - c++: remove deprecated dynamic throw() specifications.
86 - c++: improve the (unsupported) bad_loop exception class.
87 - backport perl ev_periodic example to C, untested.
88 - update libecb, biggets change is to include a memory fence
89 in ECB_MEMORY_FENCE_RELEASE on x86/amd64.
90 - minor autoconf/automake modernisation.
91
924.24 Wed Dec 28 05:19:55 CET 2016
93 - bump version to 4.24, as the release tarball inexplicably
94 didn't have the right version in ev.h, even though the cvs-tagged
95 version did have the right one (reported by Ales Teska).
96
974.23 Wed Nov 16 18:23:41 CET 2016
98 - move some declarations at the beginning to help certain retarded
99 microsoft compilers, even though their documentation claims
100 otherwise (reported by Ruslan Osmanov).
101
1024.22 Sun Dec 20 22:11:50 CET 2015
103 - when epoll detects unremovable fds in the fd set, rebuild
104 only the epoll descriptor, not the signal pipe, to avoid
105 SIGPIPE in ev_async_send. This doesn't solve it on fork,
106 so document what needs to be done in ev_loop_fork
107 (analyzed by Benjamin Mahler).
108 - remove superfluous sys/timeb.h include on win32
109 (analyzed by Jason Madden).
110 - updated libecb.
111
1124.20 Sat Jun 20 13:01:43 CEST 2015
113 - prefer noexcept over throw () with C++ 11.
114 - update ecb.h due to incompatibilities with c11.
115 - fix a potential aliasing issue when reading and writing
116 watcher callbacks.
117
1184.19 Thu Sep 25 08:18:25 CEST 2014
119 - ev.h wasn't valid C++ anymore, which tripped compilers other than
120 clang, msvc or gcc (analyzed by Raphael 'kena' Poss). Unfortunately,
121 C++ doesn't support typedefs for function pointers fully, so the affected
122 declarations have to spell out the types each time.
123 - when not using autoconf, tighten the check for clock_gettime and related
124 functionality.
125
1264.18 Fri Sep 5 17:55:26 CEST 2014
127 - events on files were not always generated properly with the
128 epoll backend (testcase by Assaf Inbal).
129 - mark event pipe fd as cloexec after a fork (analyzed by Sami Farin).
130 - (ecb) support m68k, m88k and sh (patch by Miod Vallat).
131 - use a reasonable fallback for EV_NSIG instead of erroring out
132 when we can't detect the signal set size.
133 - in the absence of autoconf, do not use the clock syscall
134 on glibc >= 2.17 (avoids the syscall AND -lrt on systems
135 doing clock_gettime in userspace).
136 - ensure extern "C" function pointers are used for externally-visible
137 loop callbacks (not watcher callbacks yet).
138 - (ecb) work around memory barriers and volatile apparently both being
139 broken in visual studio 2008 and later (analysed and patch by Nicolas Noble).
140
1414.15 Fri Mar 1 12:04:50 CET 2013
142 - destroying a non-default loop would stop the global waitpid
143 watcher (Denis Bilenko).
144 - queueing pending watchers of higher priority from a watcher now invokes
145 them in a timely fashion (reported by Denis Bilenko).
146 - add throw() to all libev functions that cannot throw exceptions, for
147 further code size decrease when compiling for C++.
148 - add throw () to callbacks that must not throw exceptions (allocator,
149 syserr, loop acquire/release, periodic reschedule cbs).
150 - fix event_base_loop return code, add event_get_callback, event_base_new,
151 event_base_get_method calls to improve libevent 1.x emulation and add
152 some libevent 2.x functionality (based on a patch by Jeff Davey).
153 - add more memory fences to fix a bug reported by Jeff Davey. Better
154 be overfenced than underprotected.
155 - ev_run now returns a boolean status (true meaning watchers are
156 still active).
157 - ev_once: undef EV_ERROR in ev_kqueue.c, to avoid clashing with
158 libev's EV_ERROR (reported by 191919).
159 - (ecb) add memory fence support for xlC (Darin McBride).
160 - (ecb) add memory fence support for gcc-mips (Anton Kirilov).
161 - (ecb) add memory fence support for gcc-alpha (Christian Weisgerber).
162 - work around some kernels losing file descriptors by leaking
163 the kqueue descriptor in the child.
164 - work around linux inotify not reporting IN_ATTRIB changes for directories
165 in many cases.
166 - include sys/syscall.h instead of plain syscall.h.
167 - check for io watcher loops in ev_verify, check for the most
168 common reported usage bug in ev_io_start.
169 - choose socket vs. WSASocket at compiletime using EV_USE_WSASOCKET.
170 - always use WSASend/WSARecv directly on windows, hoping that this
171 works in all cases (unlike read/write/send/recv...).
172 - try to detect signals around a fork faster (test program by
173 Denis Bilenko).
174 - work around recent glibc versions that leak memory in realloc.
175 - rename ev::embed::set to ev::embed::set_embed to avoid clashing
176 the watcher base set (loop) method.
177 - rewrite the async/signal pipe logic to always keep a valid fd, which
178 simplifies (and hopefully correctifies :) the race checking
179 on fork, at the cost of one extra fd.
180 - add fat, msdos, jffs2, ramfs, ntfs and btrfs to the list of
181 inotify-supporting filesystems.
182 - move orig_CFLAGS assignment to after AC_INIT, as newer autoconf
183 versions ignore it before
184 (https://bugzilla.redhat.com/show_bug.cgi?id=908096).
185 - add some untested android support.
186 - enum expressions must be of type int (reported by Juan Pablo L).
187
1884.11 Sat Feb 4 19:52:39 CET 2012
189 - INCOMPATIBLE CHANGE: ev_timer_again now clears the pending status, as
190 was documented already, but not implemented in the repeating case.
191 - new compiletime symbols: EV_NO_SMP and EV_NO_THREADS.
192 - fix a race where the workaround against the epoll fork bugs
193 caused signals to not be handled anymore.
194 - correct backend_fudge for most backends, and implement a windows
195 specific workaround to avoid looping because we call both
196 select and Sleep, both with different time resolutions.
197 - document range and guarantees of ev_sleep.
198 - document reasonable ranges for periodics interval and offset.
199 - rename backend_fudge to backend_mintime to avoid future confusion :)
200 - change the default periodic reschedule function to hopefully be more
201 exact and correct even in corner cases or in the far future.
202 - do not rely on -lm anymore: use it when available but use our
203 own floor () if it is missing. This should make it easier to embed,
204 as no external libraries are required.
205 - strategically import macros from libecb and mark rarely-used functions
206 as cache-cold (saving almost 2k code size on typical amd64 setups).
207 - add Symbols.ev and Symbols.event files, that were missing.
208 - fix backend_mintime value for epoll (was 1/1024, is 1/1000 now).
209 - fix #3 "be smart about timeouts" to not "deadlock" when
210 timeout == now, also improve the section overall.
211 - avoid "AVOIDING FINISHING BEFORE RETURNING" idiom.
212 - support new EV_API_STATIC mode to make all libev symbols
213 static.
214 - supply default CFLAGS of -g -O3 with gcc when original CFLAGS
215 were empty.
216
2174.04 Wed Feb 16 09:01:51 CET 2011
218 - fix two problems in the native win32 backend, where reuse of fd's
219 with different underlying handles caused handles not to be removed
220 or added to the select set (analyzed and tested by Bert Belder).
221 - do no rely on ceil() in ev_e?poll.c.
222 - backport libev to HP-UX versions before 11 v3.
223 - configure did not detect nanosleep and clock_gettime properly when
224 they are available in the libc (as opposed to -lrt).
225
2264.03 Tue Jan 11 14:37:25 CET 2011
227 - officially support polling files with all backends.
228 - support files, /dev/zero etc. the same way as select in the epoll
229 backend, by generating events on our own.
230 - ports backend: work around solaris bug 6874410 and many related ones
231 (EINTR, maybe more), with no performance loss (note that the solaris
232 bug report is actually wrong, reality is far more bizarre and broken
233 than that).
234 - define EV_READ/EV_WRITE as macros in event.h, as some programs use
235 #ifdef to test for them.
236 - new (experimental) function: ev_feed_signal.
237 - new (to become default) EVFLAG_NOSIGMASK flag.
238 - new EVBACKEND_MASK symbol.
239 - updated COMMON IDIOMS SECTION.
240
2414.01 Fri Nov 5 21:51:29 CET 2010
242 - automake fucked it up, apparently, --add-missing -f is not quite enough
243 to make it update its files, so 4.00 didn't install ev++.h and
244 event.h on make install. grrr.
245 - ev_loop(count|depth) didn't return anything (Robin Haberkorn).
246 - change EV_UNDEF to 0xffffffff to silence some overzealous compilers.
247 - use "(libev) " prefix for all libev error messages now.
248
2494.00 Mon Oct 25 12:32:12 CEST 2010
250 - "PORTING FROM LIBEV 3.X TO 4.X" (in ev.pod) is recommended reading.
251 - ev_embed_stop did not correctly stop the watcher (very good
252 testcase by Vladimir Timofeev).
253 - ev_run will now always update the current loop time - it erroneously
254 didn't when idle watchers were active, causing timers not to fire.
255 - fix a bug where a timeout of zero caused the timer not to fire
256 in the libevent emulation (testcase by Péter Szabó).
257 - applied win32 fixes by Michael Lenaghan (also James Mansion).
258 - replace EV_MINIMAL by EV_FEATURES.
259 - prefer EPOLL_CTL_ADD over EPOLL_CTL_MOD in some more cases, as it
260 seems the former is *much* faster than the latter.
261 - linux kernel version detection (for inotify bug workarounds)
262 did not work properly.
263 - reduce the number of spurious wake-ups with the ports backend.
264 - remove dependency on sys/queue.h on freebsd (patch by Vanilla Hsu).
265 - do async init within ev_async_start, not ev_async_set, which avoids
266 an API quirk where the set function must be called in the C++ API
267 even when there is nothing to set.
268 - add (undocumented) EV_ENABLE when adding events with kqueue,
269 this might help with OS X, which seems to need it despite documenting
270 not to need it (helpfully pointed out by Tilghman Lesher).
271 - do not use poll by default on freebsd, it's broken (what isn't
272 on freebsd...).
273 - allow to embed epoll on kernels >= 2.6.32.
274 - configure now prepends -O3, not appends it, so one can still
275 override it.
276 - ev.pod: greatly expanded the portability section, added a porting
277 section, a description of watcher states and made lots of minor fixes.
278 - disable poll backend on AIX, the poll header spams the namespace
279 and it's not worth working around dead platforms (reported
280 and analyzed by Aivars Kalvans).
281 - improve header file compatibility of the standalone eventfd code
282 in an obscure case.
283 - implement EV_AVOID_STDIO option.
284 - do not use sscanf to parse linux version number (smaller, faster,
285 no sscanf dependency).
286 - new EV_CHILD_ENABLE and EV_SIGNAL_ENABLE configurable settings.
287 - update libev.m4 HAVE_CLOCK_SYSCALL test for newer glibcs.
288 - add section on accept() problems to the manpage.
289 - rename EV_TIMEOUT to EV_TIMER.
290 - rename ev_loop_count/depth/verify/loop/unloop.
291 - remove ev_default_destroy and ev_default_fork.
292 - switch to two-digit minor version.
293 - work around an apparent gentoo compiler bug.
294 - define _DARWIN_UNLIMITED_SELECT. just so.
295 - use enum instead of #define for most constants.
296 - improve compatibility to older C++ compilers.
297 - (experimental) ev_run/ev_default_loop/ev_break/ev_loop_new have now
298 default arguments when compiled as C++.
299 - enable automake dependency tracking.
300 - ev_loop_new no longer leaks memory when loop creation failed.
301 - new ev_cleanup watcher type.
302
3033.9 Thu Dec 31 07:59:59 CET 2009
304 - signalfd is no longer used by default and has to be requested
305 explicitly - this means that easy to catch bugs become hard to
306 catch race conditions, but the users have spoken.
307 - point out the unspecified signal mask in the documentation, and
308 that this is a race condition regardless of EV_SIGNALFD.
309 - backport inotify code to C89.
310 - inotify file descriptors could leak into child processes.
311 - ev_stat watchers could keep an erroneous extra ref on the loop,
312 preventing exit when unregistering all watchers (testcases
313 provided by ry@tinyclouds.org).
314 - implement EV_WIN32_HANDLE_TO_FD and EV_WIN32_CLOSE_FD configuration
315 symbols to make it easier for apps to do their own fd management.
316 - support EV_IDLE_ENABLE being disabled in ev++.h
317 (patch by Didier Spezia).
318 - take advantage of inotify_init1, if available, to set cloexec/nonblock
319 on fd creation, to avoid races.
320 - the signal handling pipe wasn't always initialised under windows
321 (analysed by lekma).
322 - changed minimum glibc requirement from glibc 2.9 to 2.7, for
323 signalfd.
324 - add missing string.h include (Denis F. Latypoff).
325 - only replace ev_stat.prev when we detect an actual difference,
326 so prev is (almost) always different to attr. this might
327 have caused the problems with 04_stat.t.
328 - add ev::timer->remaining () method to C++ API.
329
3303.8 Sun Aug 9 14:30:45 CEST 2009
331 - incompatible change: do not necessarily reset signal handler
332 to SIG_DFL when a sighandler is stopped.
333 - ev_default_destroy did not properly free or zero some members,
334 potentially causing crashes and memory corruption on repeated
335 ev_default_destroy/ev_default_loop calls.
336 - take advantage of signalfd on GNU/Linux systems.
337 - document that the signal mask might be in an unspecified
338 state when using libev's signal handling.
339 - take advantage of some GNU/Linux calls to set cloexec/nonblock
340 on fd creation, to avoid race conditions.
341
3423.7 Fri Jul 17 16:36:32 CEST 2009
11 - ev_unloop and ev_loop wrongly used a global variable to exit loops, 343 - ev_unloop and ev_loop wrongly used a global variable to exit loops,
12 instead of using a per-loop variable (bug caught by accident...). 344 instead of using a per-loop variable (bug caught by accident...).
345 - the ev_set_io_collect_interval interpretation has changed.
346 - add new functionality: ev_set_userdata, ev_userdata,
347 ev_set_invoke_pending_cb, ev_set_loop_release_cb,
348 ev_invoke_pending, ev_pending_count, together with a long example
349 about thread locking.
350 - add ev_timer_remaining (as requested by Denis F. Latypoff).
351 - add ev_loop_depth.
13 - calling ev_unloop in fork/prepare watchers will no longer poll 352 - calling ev_unloop in fork/prepare watchers will no longer poll
14 for new events. 353 for new events.
15 - Denis F. Latypoff corrected many typos in example code snippets. 354 - Denis F. Latypoff corrected many typos in example code snippets.
16 - the ev_set_io_collect_interval interpretation has changed.
17 - honor autoconf detection of EV_USE_CLOCK_SYSCALL, also double- 355 - honor autoconf detection of EV_USE_CLOCK_SYSCALL, also double-
18 check that the syscall number is available before trying to 356 check that the syscall number is available before trying to
19 use it (reported by ry@tinyclouds). 357 use it (reported by ry@tinyclouds).
20 - use GetSystemTimeAsFileTime instead of _timeb on windows, for 358 - use GetSystemTimeAsFileTime instead of _timeb on windows, for
21 slightly higher accuracy. 359 slightly higher accuracy.
22 - properly declare ev_loop_verify and ev_now_update even when 360 - properly declare ev_loop_verify and ev_now_update even when
23 !EV_MULTIPLICITY. 361 !EV_MULTIPLICITY.
24 - implement ev_loop_depth.
25 - do not compile in any priority code when EV_MAXPRI == EV_MINPRI. 362 - do not compile in any priority code when EV_MAXPRI == EV_MINPRI.
26 - support EV_MINIMAL==2 for a reduced API. 363 - support EV_MINIMAL==2 for a reduced API.
27 - actually 0-initialise struct sigaction when installing signals. 364 - actually 0-initialise struct sigaction when installing signals.
28 - add section on hibernate and stopped processes to ev_timer docs. 365 - add section on hibernate and stopped processes to ev_timer docs.
29 366
… …
37 - correctly zero the idx values for arrays, so destroying and 374 - correctly zero the idx values for arrays, so destroying and
38 reinitialising the default loop actually works (patch by 375 reinitialising the default loop actually works (patch by
39 Malek Hadj-Ali). 376 Malek Hadj-Ali).
40 - implement ev_suspend and ev_resume. 377 - implement ev_suspend and ev_resume.
41 - new EV_CUSTOM revents flag for use by applications. 378 - new EV_CUSTOM revents flag for use by applications.
42 - add documentation section about priorites. 379 - add documentation section about priorities.
43 - add a glossary to the dcoumentation. 380 - add a glossary to the documentation.
44 - extend the ev_fork description slightly. 381 - extend the ev_fork description slightly.
45 - optimize a jump out of call_pending. 382 - optimize a jump out of call_pending.
46 383
473.53 Sun Feb 15 02:38:20 CET 2009 3843.53 Sun Feb 15 02:38:20 CET 2009
48 - fix a bug in event pipe creation on win32 that would cause a 385 - fix a bug in event pipe creation on win32 that would cause a
… …
124 do similar changes for event.c. 461 do similar changes for event.c.
125 462
1263.45 Tue Oct 21 21:59:26 CEST 2008 4633.45 Tue Oct 21 21:59:26 CEST 2008
127 - disable inotify usage on linux <2.6.25, as it is broken 464 - disable inotify usage on linux <2.6.25, as it is broken
128 (reported by Yoann Vandoorselaere). 465 (reported by Yoann Vandoorselaere).
129 - ev_stat errornously would try to add inotify watchers 466 - ev_stat erroneously would try to add inotify watchers
130 even when inotify wasn't available (this should only 467 even when inotify wasn't available (this should only
131 have a performance impact). 468 have a performance impact).
132 - ev_once now passes both timeout and io to the callback if both 469 - ev_once now passes both timeout and io to the callback if both
133 occur concurrently, instead of giving timeouts precedence. 470 occur concurrently, instead of giving timeouts precedence.
134 - disable EV_USE_INOTIFY when sys/inotify.h is too old. 471 - disable EV_USE_INOTIFY when sys/inotify.h is too old.
… …
202 - enable inlining with gcc versions 2 and 3. 539 - enable inlining with gcc versions 2 and 3.
203 - work around broken poll implementations potentially 540 - work around broken poll implementations potentially
204 not clearing revents field in ev_poll (Brandon Black) 541 not clearing revents field in ev_poll (Brandon Black)
205 (no such systems are known at this time). 542 (no such systems are known at this time).
206 - work around a bug in realloc on openbsd and darwin, 543 - work around a bug in realloc on openbsd and darwin,
207 also makes the errornous valgrind complaints 544 also makes the erroneous valgrind complaints
208 go away (noted by various people). 545 go away (noted by various people).
209 - fix ev_async_pending, add c++ wrapper for ev_async 546 - fix ev_async_pending, add c++ wrapper for ev_async
210 (based on patch sent by Johannes Deisenhofer. 547 (based on patch sent by Johannes Deisenhofer).
211 - add sensible set method to ev::embed. 548 - add sensible set method to ev::embed.
212 - made integer constants type int in ev.h. 549 - made integer constants type int in ev.h.
213 550
2143.2 Wed Apr 2 17:11:19 CEST 2008 5513.2 Wed Apr 2 17:11:19 CEST 2008
215 - fix a 64 bit overflow issue in the select backend, 552 - fix a 64 bit overflow issue in the select backend,

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