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Comparing libev/Changes (file contents):
Revision 1.94 by root, Wed Dec 24 22:05:18 2008 UTC vs.
Revision 1.308 by root, Sat Oct 17 21:47:56 2015 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: ev_loop_wakeup
4TODO: EV_STANDALONE == NO_HASSEL (do not use clock_gettime in ev_standalone)
5TODO: faq, process a thing in each iteration
6TODO: dbeugging tips, ev_verify, ev_init twice
7TODO: ev_break for immediate exit (EVBREAK_NOW?)
8TODO: ev_feed_child_event
9TODO: document the special problem of signals around fork.
10TODO: store pid for each signal
11TODO: document file descriptor usage per loop
12TODO: store loop pid_t and compare isndie signal handler,store 1 for same, 2 for differign pid, clean up in loop_fork
13TODO: embed watchers need updating when fd changes
14TODO: document portability requirements for atomic pointer access
15TODO: document requirements for function pointers and calling conventions.
16
174.22
18 - when epoll detects unremovable fds in the fd set, rebuild
19 only the epoll descriptor, not the signal pipe, to avoid
20 SIGPIPE in ev_async_send. This doesn't solve it on fork,
21 so document what needs to be done in ev_loop_fork
22 (analyzed by Benjamin Mahler).
23 - remove superfluous sys/timeb.h include on win32
24 (analyzed by Jason Madden).
25
264.20 Sat Jun 20 13:01:43 CEST 2015
27 - prefer noexcept over throw () with C++ 11.
28 - update ecb.h due to incompatibilities with c11.
29 - fix a potential aliasing issue when reading and writing
30 watcher callbacks.
31
324.19 Thu Sep 25 08:18:25 CEST 2014
33 - ev.h wasn't valid C++ anymore, which tripped compilers other than
34 clang, msvc or gcc (analyzed by Raphael 'kena' Poss). Unfortunately,
35 C++ doesn't support typedefs for function pointers fully, so the affected
36 declarations have to spell out the types each time.
37 - when not using autoconf, tighten the check for clock_gettime and related
38 functionality.
39
404.18 Fri Sep 5 17:55:26 CEST 2014
41 - events on files were not always generated properly with the
42 epoll backend (testcase by Assaf Inbal).
43 - mark event pipe fd as cloexec after a fork (analyzed by Sami Farin).
44 - (ecb) support m68k, m88k and sh (patch by Miod Vallat).
45 - use a reasonable fallback for EV_NSIG instead of erroring out
46 when we can't detect the signal set size.
47 - in the absence of autoconf, do not use the clock syscall
48 on glibc >= 2.17 (avoids the syscall AND -lrt on systems
49 doing clock_gettime in userspace).
50 - ensure extern "C" function pointers are used for externally-visible
51 loop callbacks (not watcher callbacks yet).
52 - (ecb) work around memory barriers and volatile apparently both being
53 broken in visual studio 2008 and later (analysed and patch by Nicolas Noble).
54
554.15 Fri Mar 1 12:04:50 CET 2013
56 - destroying a non-default loop would stop the global waitpid
57 watcher (Denis Bilenko).
58 - queueing pending watchers of higher priority from a watcher now invokes
59 them in a timely fashion (reported by Denis Bilenko).
60 - add throw() to all libev functions that cannot throw exceptions, for
61 further code size decrease when compiling for C++.
62 - add throw () to callbacks that must not throw exceptions (allocator,
63 syserr, loop acquire/release, periodic reschedule cbs).
64 - fix event_base_loop return code, add event_get_callback, event_base_new,
65 event_base_get_method calls to improve libevent 1.x emulation and add
66 some libevent 2.x functionality (based on a patch by Jeff Davey).
67 - add more memory fences to fix a bug reported by Jeff Davey. Better
68 be overfenced than underprotected.
69 - ev_run now returns a boolean status (true meaning watchers are
70 still active).
71 - ev_once: undef EV_ERROR in ev_kqueue.c, to avoid clashing with
72 libev's EV_ERROR (reported by 191919).
73 - (ecb) add memory fence support for xlC (Darin McBride).
74 - (ecb) add memory fence support for gcc-mips (Anton Kirilov).
75 - (ecb) add memory fence support for gcc-alpha (Christian Weisgerber).
76 - work around some kernels losing file descriptors by leaking
77 the kqueue descriptor in the child.
78 - work around linux inotify not reporting IN_ATTRIB changes for directories
79 in many cases.
80 - include sys/syscall.h instead of plain syscall.h.
81 - check for io watcher loops in ev_verify, check for the most
82 common reported usage bug in ev_io_start.
83 - choose socket vs. WSASocket at compiletime using EV_USE_WSASOCKET.
84 - always use WSASend/WSARecv directly on windows, hoping that this
85 works in all cases (unlike read/write/send/recv...).
86 - try to detect signals around a fork faster (test program by
87 Denis Bilenko).
88 - work around recent glibc versions that leak memory in realloc.
89 - rename ev::embed::set to ev::embed::set_embed to avoid clashing
90 the watcher base set (loop) method.
91 - rewrite the async/signal pipe logic to always keep a valid fd, which
92 simplifies (and hopefully correctifies :) the race checking
93 on fork, at the cost of one extra fd.
94 - add fat, msdos, jffs2, ramfs, ntfs and btrfs to the list of
95 inotify-supporting filesystems.
96 - move orig_CFLAGS assignment to after AC_INIT, as newer autoconf
97 versions ignore it before
98 (https://bugzilla.redhat.com/show_bug.cgi?id=908096).
99 - add some untested android support.
100 - enum expressions must be of type int (reported by Juan Pablo L).
101
1024.11 Sat Feb 4 19:52:39 CET 2012
103 - INCOMPATIBLE CHANGE: ev_timer_again now clears the pending status, as
104 was documented already, but not implemented in the repeating case.
105 - new compiletime symbols: EV_NO_SMP and EV_NO_THREADS.
106 - fix a race where the workaround against the epoll fork bugs
107 caused signals to not be handled anymore.
108 - correct backend_fudge for most backends, and implement a windows
109 specific workaround to avoid looping because we call both
110 select and Sleep, both with different time resolutions.
111 - document range and guarantees of ev_sleep.
112 - document reasonable ranges for periodics interval and offset.
113 - rename backend_fudge to backend_mintime to avoid future confusion :)
114 - change the default periodic reschedule function to hopefully be more
115 exact and correct even in corner cases or in the far future.
116 - do not rely on -lm anymore: use it when available but use our
117 own floor () if it is missing. This should make it easier to embed,
118 as no external libraries are required.
119 - strategically import macros from libecb and mark rarely-used functions
120 as cache-cold (saving almost 2k code size on typical amd64 setups).
121 - add Symbols.ev and Symbols.event files, that were missing.
122 - fix backend_mintime value for epoll (was 1/1024, is 1/1000 now).
123 - fix #3 "be smart about timeouts" to not "deadlock" when
124 timeout == now, also improve the section overall.
125 - avoid "AVOIDING FINISHING BEFORE RETURNING" idiom.
126 - support new EV_API_STATIC mode to make all libev symbols
127 static.
128 - supply default CFLAGS of -g -O3 with gcc when original CFLAGS
129 were empty.
130
1314.04 Wed Feb 16 09:01:51 CET 2011
132 - fix two problems in the native win32 backend, where reuse of fd's
133 with different underlying handles caused handles not to be removed
134 or added to the select set (analyzed and tested by Bert Belder).
135 - do no rely on ceil() in ev_e?poll.c.
136 - backport libev to HP-UX versions before 11 v3.
137 - configure did not detect nanosleep and clock_gettime properly when
138 they are available in the libc (as opposed to -lrt).
139
1404.03 Tue Jan 11 14:37:25 CET 2011
141 - officially support polling files with all backends.
142 - support files, /dev/zero etc. the same way as select in the epoll
143 backend, by generating events on our own.
144 - ports backend: work around solaris bug 6874410 and many related ones
145 (EINTR, maybe more), with no performance loss (note that the solaris
146 bug report is actually wrong, reality is far more bizarre and broken
147 than that).
148 - define EV_READ/EV_WRITE as macros in event.h, as some programs use
149 #ifdef to test for them.
150 - new (experimental) function: ev_feed_signal.
151 - new (to become default) EVFLAG_NOSIGMASK flag.
152 - new EVBACKEND_MASK symbol.
153 - updated COMMON IDIOMS SECTION.
154
1554.01 Fri Nov 5 21:51:29 CET 2010
156 - automake fucked it up, apparently, --add-missing -f is not quite enough
157 to make it update its files, so 4.00 didn't install ev++.h and
158 event.h on make install. grrr.
159 - ev_loop(count|depth) didn't return anything (Robin Haberkorn).
160 - change EV_UNDEF to 0xffffffff to silence some overzealous compilers.
161 - use "(libev) " prefix for all libev error messages now.
162
1634.00 Mon Oct 25 12:32:12 CEST 2010
164 - "PORTING FROM LIBEV 3.X TO 4.X" (in ev.pod) is recommended reading.
165 - ev_embed_stop did not correctly stop the watcher (very good
166 testcase by Vladimir Timofeev).
167 - ev_run will now always update the current loop time - it erroneously
168 didn't when idle watchers were active, causing timers not to fire.
169 - fix a bug where a timeout of zero caused the timer not to fire
170 in the libevent emulation (testcase by Péter Szabó).
171 - applied win32 fixes by Michael Lenaghan (also James Mansion).
172 - replace EV_MINIMAL by EV_FEATURES.
173 - prefer EPOLL_CTL_ADD over EPOLL_CTL_MOD in some more cases, as it
174 seems the former is *much* faster than the latter.
175 - linux kernel version detection (for inotify bug workarounds)
176 did not work properly.
177 - reduce the number of spurious wake-ups with the ports backend.
178 - remove dependency on sys/queue.h on freebsd (patch by Vanilla Hsu).
179 - do async init within ev_async_start, not ev_async_set, which avoids
180 an API quirk where the set function must be called in the C++ API
181 even when there is nothing to set.
182 - add (undocumented) EV_ENABLE when adding events with kqueue,
183 this might help with OS X, which seems to need it despite documenting
184 not to need it (helpfully pointed out by Tilghman Lesher).
185 - do not use poll by default on freebsd, it's broken (what isn't
186 on freebsd...).
187 - allow to embed epoll on kernels >= 2.6.32.
188 - configure now prepends -O3, not appends it, so one can still
189 override it.
190 - ev.pod: greatly expanded the portability section, added a porting
191 section, a description of watcher states and made lots of minor fixes.
192 - disable poll backend on AIX, the poll header spams the namespace
193 and it's not worth working around dead platforms (reported
194 and analyzed by Aivars Kalvans).
195 - improve header file compatibility of the standalone eventfd code
196 in an obscure case.
197 - implement EV_AVOID_STDIO option.
198 - do not use sscanf to parse linux version number (smaller, faster,
199 no sscanf dependency).
200 - new EV_CHILD_ENABLE and EV_SIGNAL_ENABLE configurable settings.
201 - update libev.m4 HAVE_CLOCK_SYSCALL test for newer glibcs.
202 - add section on accept() problems to the manpage.
203 - rename EV_TIMEOUT to EV_TIMER.
204 - rename ev_loop_count/depth/verify/loop/unloop.
205 - remove ev_default_destroy and ev_default_fork.
206 - switch to two-digit minor version.
207 - work around an apparent gentoo compiler bug.
208 - define _DARWIN_UNLIMITED_SELECT. just so.
209 - use enum instead of #define for most constants.
210 - improve compatibility to older C++ compilers.
211 - (experimental) ev_run/ev_default_loop/ev_break/ev_loop_new have now
212 default arguments when compiled as C++.
213 - enable automake dependency tracking.
214 - ev_loop_new no longer leaks memory when loop creation failed.
215 - new ev_cleanup watcher type.
216
2173.9 Thu Dec 31 07:59:59 CET 2009
218 - signalfd is no longer used by default and has to be requested
219 explicitly - this means that easy to catch bugs become hard to
220 catch race conditions, but the users have spoken.
221 - point out the unspecified signal mask in the documentation, and
222 that this is a race condition regardless of EV_SIGNALFD.
223 - backport inotify code to C89.
224 - inotify file descriptors could leak into child processes.
225 - ev_stat watchers could keep an erroneous extra ref on the loop,
226 preventing exit when unregistering all watchers (testcases
227 provided by ry@tinyclouds.org).
228 - implement EV_WIN32_HANDLE_TO_FD and EV_WIN32_CLOSE_FD configuration
229 symbols to make it easier for apps to do their own fd management.
230 - support EV_IDLE_ENABLE being disabled in ev++.h
231 (patch by Didier Spezia).
232 - take advantage of inotify_init1, if available, to set cloexec/nonblock
233 on fd creation, to avoid races.
234 - the signal handling pipe wasn't always initialised under windows
235 (analysed by lekma).
236 - changed minimum glibc requirement from glibc 2.9 to 2.7, for
237 signalfd.
238 - add missing string.h include (Denis F. Latypoff).
239 - only replace ev_stat.prev when we detect an actual difference,
240 so prev is (almost) always different to attr. this might
241 have caused the problems with 04_stat.t.
242 - add ev::timer->remaining () method to C++ API.
243
2443.8 Sun Aug 9 14:30:45 CEST 2009
245 - incompatible change: do not necessarily reset signal handler
246 to SIG_DFL when a sighandler is stopped.
247 - ev_default_destroy did not properly free or zero some members,
248 potentially causing crashes and memory corruption on repeated
249 ev_default_destroy/ev_default_loop calls.
250 - take advantage of signalfd on GNU/Linux systems.
251 - document that the signal mask might be in an unspecified
252 state when using libev's signal handling.
253 - take advantage of some GNU/Linux calls to set cloexec/nonblock
254 on fd creation, to avoid race conditions.
255
2563.7 Fri Jul 17 16:36:32 CEST 2009
257 - ev_unloop and ev_loop wrongly used a global variable to exit loops,
258 instead of using a per-loop variable (bug caught by accident...).
259 - the ev_set_io_collect_interval interpretation has changed.
260 - add new functionality: ev_set_userdata, ev_userdata,
261 ev_set_invoke_pending_cb, ev_set_loop_release_cb,
262 ev_invoke_pending, ev_pending_count, together with a long example
263 about thread locking.
264 - add ev_timer_remaining (as requested by Denis F. Latypoff).
265 - add ev_loop_depth.
266 - calling ev_unloop in fork/prepare watchers will no longer poll
267 for new events.
268 - Denis F. Latypoff corrected many typos in example code snippets.
269 - honor autoconf detection of EV_USE_CLOCK_SYSCALL, also double-
270 check that the syscall number is available before trying to
271 use it (reported by ry@tinyclouds).
272 - use GetSystemTimeAsFileTime instead of _timeb on windows, for
273 slightly higher accuracy.
274 - properly declare ev_loop_verify and ev_now_update even when
275 !EV_MULTIPLICITY.
276 - do not compile in any priority code when EV_MAXPRI == EV_MINPRI.
277 - support EV_MINIMAL==2 for a reduced API.
278 - actually 0-initialise struct sigaction when installing signals.
279 - add section on hibernate and stopped processes to ev_timer docs.
280
2813.6 Tue Apr 28 02:49:30 CEST 2009
282 - multiple timers becoming ready within an event loop iteration
283 will be invoked in the "correct" order now.
284 - do not leave the event loop early just because we have no active
285 watchers, fixing a problem when embedding a kqueue loop
286 that has active kernel events but no registered watchers
287 (reported by blacksand blacksand).
288 - correctly zero the idx values for arrays, so destroying and
289 reinitialising the default loop actually works (patch by
290 Malek Hadj-Ali).
291 - implement ev_suspend and ev_resume.
292 - new EV_CUSTOM revents flag for use by applications.
293 - add documentation section about priorities.
294 - add a glossary to the documentation.
295 - extend the ev_fork description slightly.
296 - optimize a jump out of call_pending.
297
2983.53 Sun Feb 15 02:38:20 CET 2009
299 - fix a bug in event pipe creation on win32 that would cause a
300 failed assertion on event loop creation (patch by Malek Hadj-Ali).
301 - probe for CLOCK_REALTIME support at runtime as well and fall
302 back to gettimeofday if there is an error, to support older
303 operating systems with newer header files/libraries.
304 - prefer gettimeofday over clock_gettime with USE_CLOCK_SYSCALL
305 (default most everywhere), otherwise not.
306
3073.52 Wed Jan 7 21:43:02 CET 2009
308 - fix compilation of select backend in fd_set mode when NFDBITS is
309 missing (to get it to compile on QNX, reported by Rodrigo Campos).
310 - better select-nfds handling when select backend is in fd_set mode.
311 - diagnose fd_set overruns when select backend is in fd_set mode.
312 - due to a thinko, instead of disabling everything but
313 select on the borked OS X platform, everything but select was
314 allowed (reported by Emanuele Giaquinta).
315 - actually verify that local and remote port are matching in
316 libev's socketpair emulation, which makes denial-of-service
317 attacks harder (but not impossible - it's windows). Make sure
318 it even works under vista, which thinks that getpeer/sockname
319 should return fantasy port numbers.
320 - include "libev" in all assertion messages for potentially
321 clearer diagnostics.
322 - event_get_version (libevent compatibility) returned
323 a useless string instead of the expected version string
324 (patch by W.C.A. Wijngaards).
2 325
33.51 Wed Dec 24 23:00:11 CET 2008 3263.51 Wed Dec 24 23:00:11 CET 2008
4 - fix a bug where an inotify watcher was added twice, causing 327 - fix a bug where an inotify watcher was added twice, causing
5 freezes on hash collisions (reported and analysed by Graham Leggett). 328 freezes on hash collisions (reported and analysed by Graham Leggett).
6 - new config symbol, EV_USE_CLOCK_SYSCALL, to make libev use 329 - new config symbol, EV_USE_CLOCK_SYSCALL, to make libev use
… …
52 do similar changes for event.c. 375 do similar changes for event.c.
53 376
543.45 Tue Oct 21 21:59:26 CEST 2008 3773.45 Tue Oct 21 21:59:26 CEST 2008
55 - disable inotify usage on linux <2.6.25, as it is broken 378 - disable inotify usage on linux <2.6.25, as it is broken
56 (reported by Yoann Vandoorselaere). 379 (reported by Yoann Vandoorselaere).
57 - ev_stat errornously would try to add inotify watchers 380 - ev_stat erroneously would try to add inotify watchers
58 even when inotify wasn't available (this should only 381 even when inotify wasn't available (this should only
59 have a performance impact). 382 have a performance impact).
60 - ev_once now passes both timeout and io to the callback if both 383 - ev_once now passes both timeout and io to the callback if both
61 occur concurrently, instead of giving timeouts precedence. 384 occur concurrently, instead of giving timeouts precedence.
62 - disable EV_USE_INOTIFY when sys/inotify.h is too old. 385 - disable EV_USE_INOTIFY when sys/inotify.h is too old.
… …
130 - enable inlining with gcc versions 2 and 3. 453 - enable inlining with gcc versions 2 and 3.
131 - work around broken poll implementations potentially 454 - work around broken poll implementations potentially
132 not clearing revents field in ev_poll (Brandon Black) 455 not clearing revents field in ev_poll (Brandon Black)
133 (no such systems are known at this time). 456 (no such systems are known at this time).
134 - work around a bug in realloc on openbsd and darwin, 457 - work around a bug in realloc on openbsd and darwin,
135 also makes the errornous valgrind complaints 458 also makes the erroneous valgrind complaints
136 go away (noted by various people). 459 go away (noted by various people).
137 - fix ev_async_pending, add c++ wrapper for ev_async 460 - fix ev_async_pending, add c++ wrapper for ev_async
138 (based on patch sent by Johannes Deisenhofer. 461 (based on patch sent by Johannes Deisenhofer).
139 - add sensible set method to ev::embed. 462 - add sensible set method to ev::embed.
140 - made integer constants type int in ev.h. 463 - made integer constants type int in ev.h.
141 464
1423.2 Wed Apr 2 17:11:19 CEST 2008 4653.2 Wed Apr 2 17:11:19 CEST 2008
143 - fix a 64 bit overflow issue in the select backend, 466 - fix a 64 bit overflow issue in the select backend,

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