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Comparing libev/Changes (file contents):
Revision 1.155 by root, Thu Dec 31 06:50:16 2009 UTC vs.
Revision 1.361 by root, Wed Jan 22 13:33:44 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: 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. also added ev::io::set (int events) method
15 to ev++.h.
16 - officially allow a zero events mask for io watchers. this should
17 work with older libev versions as well but was not officially
18 allowed before.
19 - do not wake up every minute when timerfd is used to detect timejumps.
20 - support a lot more "uncommon" compile time configurations,
21 such as ev_embed enabled but ev_timer disabled.
22 - use a start/stop wrapper class to reduce code duplication in
23 ev++.h and make it needlessly more c++-y.
24 - the linux aio backend is no longer compiled in by default.
25 - update to libecb version 0x00010008.
26
274.31 Fri Dec 20 21:58:29 CET 2019
28 - handle backends with minimum wait time a bit better by not
29 waiting in the presence of already-expired timers
30 (behaviour reported by Felipe Gasper).
31 - new feature: use timerfd to detect timejumps quickly,
32 can be disabled with the new EVFLAG_NOTIMERFD loop flag.
33 - document EV_USE_SIGNALFD feature macro.
34
354.30 (EV only)
36 - change non-autoconf test for __kernel_rwf_t by testing
37 LINUX_VERSION_CODE, the most direct test I could find.
38 - fix a bug in the io_uring backend that polled the wrong
39 backend fd, causing it to not work in many cases.
40
414.29 (EV only)
42 - add io uring autoconf and non-autoconf detection.
43 - disable io_uring when some header files are too old.
44
454.28 (EV only)
46 - linuxaio backend resulted in random memory corruption
47 when loop is forked.
48 - linuxaio backend might have tried to cancel an iocb
49 multiple times (was unable to trigger this).
50 - linuxaio backend now employs a generation counter to
51 avoid handling spurious events from cancelled requests.
52 - io_cancel can return EINTR, deal with it. also, assume
53 io_submit also returns EINTR.
54 - fix some other minor bugs in linuxaio backend.
55 - ev_tstamp type can now be overriden by defining EV_TSTAMP_T.
56 - cleanup: replace expect_true/false and noinline by their
57 libecb counterparts.
58 - move syscall infrastructure from ev_linuxaio.c to ev.c.
59 - prepare io_uring integration.
60 - tweak ev_floor.
61 - epoll, poll, win32 Sleep and other places that use millisecond
62 reslution now all try to round up times.
63 - solaris port backend didn't compile.
64 - abstract time constants into their macros, for more flexibility.
65
664.27 Thu Jun 27 22:43:44 CEST 2019
67 - linux aio backend almost completely rewritten to work around its
68 limitations.
69 - linux aio backend now requires linux 4.19+.
70 - epoll backend now mandatory for linux aio backend.
71 - fail assertions more aggressively on invalid fd's detected
72 in the event loop, do not just silently fd_kill in case of
73 user error.
74 - ev_io_start/ev_io_stop now verify the watcher fd using
75 a syscall when EV_VERIFY is 2 or higher.
76
774.26 (EV only)
78 - update to libecb 0x00010006.
79 - new experimental linux aio backend (linux 4.18+).
80 - removed redundant 0-ptr check in ev_once.
81 - updated/extended ev_set_allocator documentation.
82 - replaced EMPTY2 macro by array_needsize_noinit.
83 - minor code cleanups.
84 - epoll backend now uses epoll_create1 also after fork.
85
864.25 Fri Dec 21 07:49:20 CET 2018
87 - INCOMPATIBLE CHANGE: EV_THROW was renamed to EV_NOEXCEPT
88 (EV_THROW still provided) and now uses noexcept on C++11 or newer.
89 - move the darwin select workaround higher in ev.c, as newer versions of
90 darwin managed to break their broken select even more.
91 - ANDROID => __ANDROID__ (reported by enh@google.com).
92 - disable epoll_create1 on android because it has broken header files
93 and google is unwilling to fix them (reported by enh@google.com).
94 - avoid a minor compilation warning on win32.
95 - c++: remove deprecated dynamic throw() specifications.
96 - c++: improve the (unsupported) bad_loop exception class.
97 - backport perl ev_periodic example to C, untested.
98 - update libecb, biggets change is to include a memory fence
99 in ECB_MEMORY_FENCE_RELEASE on x86/amd64.
100 - minor autoconf/automake modernisation.
101
1024.24 Wed Dec 28 05:19:55 CET 2016
103 - bump version to 4.24, as the release tarball inexplicably
104 didn't have the right version in ev.h, even though the cvs-tagged
105 version did have the right one (reported by Ales Teska).
106
1074.23 Wed Nov 16 18:23:41 CET 2016
108 - move some declarations at the beginning to help certain retarded
109 microsoft compilers, even though their documentation claims
110 otherwise (reported by Ruslan Osmanov).
111
1124.22 Sun Dec 20 22:11:50 CET 2015
113 - when epoll detects unremovable fds in the fd set, rebuild
114 only the epoll descriptor, not the signal pipe, to avoid
115 SIGPIPE in ev_async_send. This doesn't solve it on fork,
116 so document what needs to be done in ev_loop_fork
117 (analyzed by Benjamin Mahler).
118 - remove superfluous sys/timeb.h include on win32
119 (analyzed by Jason Madden).
120 - updated libecb.
121
1224.20 Sat Jun 20 13:01:43 CEST 2015
123 - prefer noexcept over throw () with C++ 11.
124 - update ecb.h due to incompatibilities with c11.
125 - fix a potential aliasing issue when reading and writing
126 watcher callbacks.
127
1284.19 Thu Sep 25 08:18:25 CEST 2014
129 - ev.h wasn't valid C++ anymore, which tripped compilers other than
130 clang, msvc or gcc (analyzed by Raphael 'kena' Poss). Unfortunately,
131 C++ doesn't support typedefs for function pointers fully, so the affected
132 declarations have to spell out the types each time.
133 - when not using autoconf, tighten the check for clock_gettime and related
134 functionality.
135
1364.18 Fri Sep 5 17:55:26 CEST 2014
137 - events on files were not always generated properly with the
138 epoll backend (testcase by Assaf Inbal).
139 - mark event pipe fd as cloexec after a fork (analyzed by Sami Farin).
140 - (ecb) support m68k, m88k and sh (patch by Miod Vallat).
141 - use a reasonable fallback for EV_NSIG instead of erroring out
142 when we can't detect the signal set size.
143 - in the absence of autoconf, do not use the clock syscall
144 on glibc >= 2.17 (avoids the syscall AND -lrt on systems
145 doing clock_gettime in userspace).
146 - ensure extern "C" function pointers are used for externally-visible
147 loop callbacks (not watcher callbacks yet).
148 - (ecb) work around memory barriers and volatile apparently both being
149 broken in visual studio 2008 and later (analysed and patch by Nicolas Noble).
150
1514.15 Fri Mar 1 12:04:50 CET 2013
152 - destroying a non-default loop would stop the global waitpid
153 watcher (Denis Bilenko).
154 - queueing pending watchers of higher priority from a watcher now invokes
155 them in a timely fashion (reported by Denis Bilenko).
156 - add throw() to all libev functions that cannot throw exceptions, for
157 further code size decrease when compiling for C++.
158 - add throw () to callbacks that must not throw exceptions (allocator,
159 syserr, loop acquire/release, periodic reschedule cbs).
160 - fix event_base_loop return code, add event_get_callback, event_base_new,
161 event_base_get_method calls to improve libevent 1.x emulation and add
162 some libevent 2.x functionality (based on a patch by Jeff Davey).
163 - add more memory fences to fix a bug reported by Jeff Davey. Better
164 be overfenced than underprotected.
165 - ev_run now returns a boolean status (true meaning watchers are
166 still active).
167 - ev_once: undef EV_ERROR in ev_kqueue.c, to avoid clashing with
168 libev's EV_ERROR (reported by 191919).
169 - (ecb) add memory fence support for xlC (Darin McBride).
170 - (ecb) add memory fence support for gcc-mips (Anton Kirilov).
171 - (ecb) add memory fence support for gcc-alpha (Christian Weisgerber).
172 - work around some kernels losing file descriptors by leaking
173 the kqueue descriptor in the child.
174 - work around linux inotify not reporting IN_ATTRIB changes for directories
175 in many cases.
176 - include sys/syscall.h instead of plain syscall.h.
177 - check for io watcher loops in ev_verify, check for the most
178 common reported usage bug in ev_io_start.
179 - choose socket vs. WSASocket at compiletime using EV_USE_WSASOCKET.
180 - always use WSASend/WSARecv directly on windows, hoping that this
181 works in all cases (unlike read/write/send/recv...).
182 - try to detect signals around a fork faster (test program by
183 Denis Bilenko).
184 - work around recent glibc versions that leak memory in realloc.
185 - rename ev::embed::set to ev::embed::set_embed to avoid clashing
186 the watcher base set (loop) method.
187 - rewrite the async/signal pipe logic to always keep a valid fd, which
188 simplifies (and hopefully correctifies :) the race checking
189 on fork, at the cost of one extra fd.
190 - add fat, msdos, jffs2, ramfs, ntfs and btrfs to the list of
191 inotify-supporting filesystems.
192 - move orig_CFLAGS assignment to after AC_INIT, as newer autoconf
193 versions ignore it before
194 (https://bugzilla.redhat.com/show_bug.cgi?id=908096).
195 - add some untested android support.
196 - enum expressions must be of type int (reported by Juan Pablo L).
197
1984.11 Sat Feb 4 19:52:39 CET 2012
199 - INCOMPATIBLE CHANGE: ev_timer_again now clears the pending status, as
200 was documented already, but not implemented in the repeating case.
201 - new compiletime symbols: EV_NO_SMP and EV_NO_THREADS.
202 - fix a race where the workaround against the epoll fork bugs
203 caused signals to not be handled anymore.
204 - correct backend_fudge for most backends, and implement a windows
205 specific workaround to avoid looping because we call both
206 select and Sleep, both with different time resolutions.
207 - document range and guarantees of ev_sleep.
208 - document reasonable ranges for periodics interval and offset.
209 - rename backend_fudge to backend_mintime to avoid future confusion :)
210 - change the default periodic reschedule function to hopefully be more
211 exact and correct even in corner cases or in the far future.
212 - do not rely on -lm anymore: use it when available but use our
213 own floor () if it is missing. This should make it easier to embed,
214 as no external libraries are required.
215 - strategically import macros from libecb and mark rarely-used functions
216 as cache-cold (saving almost 2k code size on typical amd64 setups).
217 - add Symbols.ev and Symbols.event files, that were missing.
218 - fix backend_mintime value for epoll (was 1/1024, is 1/1000 now).
219 - fix #3 "be smart about timeouts" to not "deadlock" when
220 timeout == now, also improve the section overall.
221 - avoid "AVOIDING FINISHING BEFORE RETURNING" idiom.
222 - support new EV_API_STATIC mode to make all libev symbols
223 static.
224 - supply default CFLAGS of -g -O3 with gcc when original CFLAGS
225 were empty.
226
2274.04 Wed Feb 16 09:01:51 CET 2011
228 - fix two problems in the native win32 backend, where reuse of fd's
229 with different underlying handles caused handles not to be removed
230 or added to the select set (analyzed and tested by Bert Belder).
231 - do no rely on ceil() in ev_e?poll.c.
232 - backport libev to HP-UX versions before 11 v3.
233 - configure did not detect nanosleep and clock_gettime properly when
234 they are available in the libc (as opposed to -lrt).
235
2364.03 Tue Jan 11 14:37:25 CET 2011
237 - officially support polling files with all backends.
238 - support files, /dev/zero etc. the same way as select in the epoll
239 backend, by generating events on our own.
240 - ports backend: work around solaris bug 6874410 and many related ones
241 (EINTR, maybe more), with no performance loss (note that the solaris
242 bug report is actually wrong, reality is far more bizarre and broken
243 than that).
244 - define EV_READ/EV_WRITE as macros in event.h, as some programs use
245 #ifdef to test for them.
246 - new (experimental) function: ev_feed_signal.
247 - new (to become default) EVFLAG_NOSIGMASK flag.
248 - new EVBACKEND_MASK symbol.
249 - updated COMMON IDIOMS SECTION.
250
2514.01 Fri Nov 5 21:51:29 CET 2010
252 - automake fucked it up, apparently, --add-missing -f is not quite enough
253 to make it update its files, so 4.00 didn't install ev++.h and
254 event.h on make install. grrr.
255 - ev_loop(count|depth) didn't return anything (Robin Haberkorn).
256 - change EV_UNDEF to 0xffffffff to silence some overzealous compilers.
257 - use "(libev) " prefix for all libev error messages now.
258
2594.00 Mon Oct 25 12:32:12 CEST 2010
260 - "PORTING FROM LIBEV 3.X TO 4.X" (in ev.pod) is recommended reading.
261 - ev_embed_stop did not correctly stop the watcher (very good
262 testcase by Vladimir Timofeev).
263 - ev_run will now always update the current loop time - it erroneously
264 didn't when idle watchers were active, causing timers not to fire.
265 - fix a bug where a timeout of zero caused the timer not to fire
266 in the libevent emulation (testcase by Péter Szabó).
267 - applied win32 fixes by Michael Lenaghan (also James Mansion).
268 - replace EV_MINIMAL by EV_FEATURES.
269 - prefer EPOLL_CTL_ADD over EPOLL_CTL_MOD in some more cases, as it
270 seems the former is *much* faster than the latter.
271 - linux kernel version detection (for inotify bug workarounds)
272 did not work properly.
273 - reduce the number of spurious wake-ups with the ports backend.
274 - remove dependency on sys/queue.h on freebsd (patch by Vanilla Hsu).
275 - do async init within ev_async_start, not ev_async_set, which avoids
276 an API quirk where the set function must be called in the C++ API
277 even when there is nothing to set.
278 - add (undocumented) EV_ENABLE when adding events with kqueue,
279 this might help with OS X, which seems to need it despite documenting
280 not to need it (helpfully pointed out by Tilghman Lesher).
281 - do not use poll by default on freebsd, it's broken (what isn't
282 on freebsd...).
283 - allow to embed epoll on kernels >= 2.6.32.
284 - configure now prepends -O3, not appends it, so one can still
285 override it.
286 - ev.pod: greatly expanded the portability section, added a porting
287 section, a description of watcher states and made lots of minor fixes.
288 - disable poll backend on AIX, the poll header spams the namespace
289 and it's not worth working around dead platforms (reported
290 and analyzed by Aivars Kalvans).
291 - improve header file compatibility of the standalone eventfd code
292 in an obscure case.
293 - implement EV_AVOID_STDIO option.
294 - do not use sscanf to parse linux version number (smaller, faster,
295 no sscanf dependency).
296 - new EV_CHILD_ENABLE and EV_SIGNAL_ENABLE configurable settings.
297 - update libev.m4 HAVE_CLOCK_SYSCALL test for newer glibcs.
298 - add section on accept() problems to the manpage.
299 - rename EV_TIMEOUT to EV_TIMER.
300 - rename ev_loop_count/depth/verify/loop/unloop.
301 - remove ev_default_destroy and ev_default_fork.
302 - switch to two-digit minor version.
303 - work around an apparent gentoo compiler bug.
304 - define _DARWIN_UNLIMITED_SELECT. just so.
305 - use enum instead of #define for most constants.
306 - improve compatibility to older C++ compilers.
307 - (experimental) ev_run/ev_default_loop/ev_break/ev_loop_new have now
308 default arguments when compiled as C++.
309 - enable automake dependency tracking.
310 - ev_loop_new no longer leaks memory when loop creation failed.
311 - new ev_cleanup watcher type.
312
3133.9 Thu Dec 31 07:59:59 CET 2009
3 - signalfd is no longer used by default and has to be requested 314 - signalfd is no longer used by default and has to be requested
4 explicitly - this means that easy to catch bugs become hard to 315 explicitly - this means that easy to catch bugs become hard to
5 catch race conditions, but the users have spoken. 316 catch race conditions, but the users have spoken.
6 - point out the unspecified signal mask in the documentation, and 317 - point out the unspecified signal mask in the documentation, and
7 that this is a race condition regardless of EV_SIGNALFD. 318 that this is a race condition regardless of EV_SIGNALFD.
8 - backport inotify code to C89. 319 - backport inotify code to C89.
9 - inotify file descriptors could leak into child processes. 320 - inotify file descriptors could leak into child processes.
10 - ev_stat watchers could keep an errornous extra ref on the loop, 321 - ev_stat watchers could keep an erroneous extra ref on the loop,
11 preventing exit when unregistering all watchers (testcases 322 preventing exit when unregistering all watchers (testcases
12 provided by ry@tinyclouds.org). 323 provided by ry@tinyclouds.org).
13 - implement EV_WIN32_HANDLE_TO_FD and EV_WIN32_CLOSE_FD configuration 324 - implement EV_WIN32_HANDLE_TO_FD and EV_WIN32_CLOSE_FD configuration
14 symbols to make it easier for apps to do their own fd management. 325 symbols to make it easier for apps to do their own fd management.
15 - support EV_IDLE_ENABLE being disabled in ev++.h 326 - support EV_IDLE_ENABLE being disabled in ev++.h
… …
21 - changed minimum glibc requirement from glibc 2.9 to 2.7, for 332 - changed minimum glibc requirement from glibc 2.9 to 2.7, for
22 signalfd. 333 signalfd.
23 - add missing string.h include (Denis F. Latypoff). 334 - add missing string.h include (Denis F. Latypoff).
24 - only replace ev_stat.prev when we detect an actual difference, 335 - only replace ev_stat.prev when we detect an actual difference,
25 so prev is (almost) always different to attr. this might 336 so prev is (almost) always different to attr. this might
26 have caused the probems with 04_stat.t. 337 have caused the problems with 04_stat.t.
27 - add ev::timer->remaining () method to C++ API. 338 - add ev::timer->remaining () method to C++ API.
28 339
293.8 Sun Aug 9 14:30:45 CEST 2009 3403.8 Sun Aug 9 14:30:45 CEST 2009
30 - incompatible change: do not necessarily reset signal handler 341 - incompatible change: do not necessarily reset signal handler
31 to SIG_DFL when a sighandler is stopped. 342 to SIG_DFL when a sighandler is stopped.
32 - ev_default_destroy did not properly free or zero some members, 343 - ev_default_destroy did not properly free or zero some members,
33 potentially causing crashes and memory corruption on repated 344 potentially causing crashes and memory corruption on repeated
34 ev_default_destroy/ev_default_loop calls. 345 ev_default_destroy/ev_default_loop calls.
35 - take advantage of signalfd on GNU/Linux systems. 346 - take advantage of signalfd on GNU/Linux systems.
36 - document that the signal mask might be in an unspecified 347 - document that the signal mask might be in an unspecified
37 state when using libev's signal handling. 348 state when using libev's signal handling.
38 - take advantage of some GNU/Linux calls to set cloexec/nonblock 349 - take advantage of some GNU/Linux calls to set cloexec/nonblock
… …
73 - correctly zero the idx values for arrays, so destroying and 384 - correctly zero the idx values for arrays, so destroying and
74 reinitialising the default loop actually works (patch by 385 reinitialising the default loop actually works (patch by
75 Malek Hadj-Ali). 386 Malek Hadj-Ali).
76 - implement ev_suspend and ev_resume. 387 - implement ev_suspend and ev_resume.
77 - new EV_CUSTOM revents flag for use by applications. 388 - new EV_CUSTOM revents flag for use by applications.
78 - add documentation section about priorites. 389 - add documentation section about priorities.
79 - add a glossary to the dcoumentation. 390 - add a glossary to the documentation.
80 - extend the ev_fork description slightly. 391 - extend the ev_fork description slightly.
81 - optimize a jump out of call_pending. 392 - optimize a jump out of call_pending.
82 393
833.53 Sun Feb 15 02:38:20 CET 2009 3943.53 Sun Feb 15 02:38:20 CET 2009
84 - fix a bug in event pipe creation on win32 that would cause a 395 - fix a bug in event pipe creation on win32 that would cause a
… …
160 do similar changes for event.c. 471 do similar changes for event.c.
161 472
1623.45 Tue Oct 21 21:59:26 CEST 2008 4733.45 Tue Oct 21 21:59:26 CEST 2008
163 - disable inotify usage on linux <2.6.25, as it is broken 474 - disable inotify usage on linux <2.6.25, as it is broken
164 (reported by Yoann Vandoorselaere). 475 (reported by Yoann Vandoorselaere).
165 - ev_stat errornously would try to add inotify watchers 476 - ev_stat erroneously would try to add inotify watchers
166 even when inotify wasn't available (this should only 477 even when inotify wasn't available (this should only
167 have a performance impact). 478 have a performance impact).
168 - ev_once now passes both timeout and io to the callback if both 479 - ev_once now passes both timeout and io to the callback if both
169 occur concurrently, instead of giving timeouts precedence. 480 occur concurrently, instead of giving timeouts precedence.
170 - disable EV_USE_INOTIFY when sys/inotify.h is too old. 481 - disable EV_USE_INOTIFY when sys/inotify.h is too old.
… …
238 - enable inlining with gcc versions 2 and 3. 549 - enable inlining with gcc versions 2 and 3.
239 - work around broken poll implementations potentially 550 - work around broken poll implementations potentially
240 not clearing revents field in ev_poll (Brandon Black) 551 not clearing revents field in ev_poll (Brandon Black)
241 (no such systems are known at this time). 552 (no such systems are known at this time).
242 - work around a bug in realloc on openbsd and darwin, 553 - work around a bug in realloc on openbsd and darwin,
243 also makes the errornous valgrind complaints 554 also makes the erroneous valgrind complaints
244 go away (noted by various people). 555 go away (noted by various people).
245 - fix ev_async_pending, add c++ wrapper for ev_async 556 - fix ev_async_pending, add c++ wrapper for ev_async
246 (based on patch sent by Johannes Deisenhofer. 557 (based on patch sent by Johannes Deisenhofer).
247 - add sensible set method to ev::embed. 558 - add sensible set method to ev::embed.
248 - made integer constants type int in ev.h. 559 - made integer constants type int in ev.h.
249 560
2503.2 Wed Apr 2 17:11:19 CEST 2008 5613.2 Wed Apr 2 17:11:19 CEST 2008
251 - fix a 64 bit overflow issue in the select backend, 562 - fix a 64 bit overflow issue in the select backend,

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