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Revision: 1.229
Committed: Thu Jun 2 23:34:05 2011 UTC (12 years, 11 months ago) by root
Branch: MAIN
Changes since 1.228: +3 -0 lines
Log Message:
verify backend fudge factors by reading kernel sources

File Contents

# Content
1 Revision history for libev, a high-performance and full-featured event loop.
2
3 TODO: ev_loop_prefork hint?
4 TODO: ev_loop_wakeup
5 TODO: confusion about threads ongiong
6 TODO: not_blocked flag.
7
8 - correct backend_fudge for most backends, and implement a windows
9 specific workaround to avoid looping because we call both
10 select and Sleep, both with different time resolutions.
11 - change the default periodic reschedule function to hopefully be more
12 exact and correct even in corner cases or in the far future.
13 - document reasonable ranges for interval and offset.
14 - do not rely on -lm anymore: use it when available but use our
15 own floor () if it is missing. This should make it easier to embed.
16
17 4.04 Wed Feb 16 09:01:51 CET 2011
18 - fix two problems in the native win32 backend, where reuse of fd's
19 with different underlying handles caused handles not to be removed
20 or added to the select set (analyzed and tested by Bert Belder).
21 - do no rely on ceil() in ev_e?poll.c.
22 - backport libev to HP-UX versions before 11 v3.
23 - configure did not detect nanosleep and clock_gettime properly when
24 they are available in the libc (as opposed to -lrt).
25
26 4.03 Tue Jan 11 14:37:25 CET 2011
27 - officially support polling files with all backends.
28 - support files, /dev/zero etc. the same way as select in the epoll
29 backend, by generating events on our own.
30 - ports backend: work around solaris bug 6874410 and many related ones
31 (EINTR, maybe more), with no performance loss (note that the solaris
32 bug report is actually wrong, reality is far more bizarre and broken
33 than that).
34 - define EV_READ/EV_WRITE as macros in event.h, as some programs use
35 #ifdef to test for them.
36 - new (experimental) function: ev_feed_signal.
37 - new (to become default) EVFLAG_NOSIGMASK flag.
38 - new EVBACKEND_MASK symbol.
39 - updated COMMON IDIOMS SECTION.
40
41 4.01 Fri Nov 5 21:51:29 CET 2010
42 - automake fucked it up, apparently, --add-missing -f is not quite enough
43 to make it update its files, so 4.00 didn't install ev++.h and
44 event.h on make install. grrr.
45 - ev_loop(count|depth) didn't return anything (Robin Haberkorn).
46 - change EV_UNDEF to 0xffffffff to silence some overzealous compilers.
47 - use "(libev) " prefix for all libev error messages now.
48
49 4.00 Mon Oct 25 12:32:12 CEST 2010
50 - "PORTING FROM LIBEV 3.X TO 4.X" (in ev.pod) is recommended reading.
51 - ev_embed_stop did not correctly stop the watcher (very good
52 testcase by Vladimir Timofeev).
53 - ev_run will now always update the current loop time - it erroneously
54 didn't when idle watchers were active, causing timers not to fire.
55 - fix a bug where a timeout of zero caused the timer not to fire
56 in the libevent emulation (testcase by Péter Szabó).
57 - applied win32 fixes by Michael Lenaghan (also James Mansion).
58 - replace EV_MINIMAL by EV_FEATURES.
59 - prefer EPOLL_CTL_ADD over EPOLL_CTL_MOD in some more cases, as it
60 seems the former is *much* faster than the latter.
61 - linux kernel version detection (for inotify bug workarounds)
62 did not work properly.
63 - reduce the number of spurious wake-ups with the ports backend.
64 - remove dependency on sys/queue.h on freebsd (patch by Vanilla Hsu).
65 - do async init within ev_async_start, not ev_async_set, which avoids
66 an API quirk where the set function must be called in the C++ API
67 even when there is nothing to set.
68 - add (undocumented) EV_ENABLE when adding events with kqueue,
69 this might help with OS X, which seems to need it despite documenting
70 not to need it (helpfully pointed out by Tilghman Lesher).
71 - do not use poll by default on freebsd, it's broken (what isn't
72 on freebsd...).
73 - allow to embed epoll on kernels >= 2.6.32.
74 - configure now prepends -O3, not appends it, so one can still
75 override it.
76 - ev.pod: greatly expanded the portability section, added a porting
77 section, a description of watcher states and made lots of minor fixes.
78 - disable poll backend on AIX, the poll header spams the namespace
79 and it's not worth working around dead platforms (reported
80 and analyzed by Aivars Kalvans).
81 - improve header file compatibility of the standalone eventfd code
82 in an obscure case.
83 - implement EV_AVOID_STDIO option.
84 - do not use sscanf to parse linux version number (smaller, faster,
85 no sscanf dependency).
86 - new EV_CHILD_ENABLE and EV_SIGNAL_ENABLE configurable settings.
87 - update libev.m4 HAVE_CLOCK_SYSCALL test for newer glibcs.
88 - add section on accept() problems to the manpage.
89 - rename EV_TIMEOUT to EV_TIMER.
90 - rename ev_loop_count/depth/verify/loop/unloop.
91 - remove ev_default_destroy and ev_default_fork.
92 - switch to two-digit minor version.
93 - work around an apparent gentoo compiler bug.
94 - define _DARWIN_UNLIMITED_SELECT. just so.
95 - use enum instead of #define for most constants.
96 - improve compatibility to older C++ compilers.
97 - (experimental) ev_run/ev_default_loop/ev_break/ev_loop_new have now
98 default arguments when compiled as C++.
99 - enable automake dependency tracking.
100 - ev_loop_new no longer leaks memory when loop creation failed.
101 - new ev_cleanup watcher type.
102
103 3.9 Thu Dec 31 07:59:59 CET 2009
104 - signalfd is no longer used by default and has to be requested
105 explicitly - this means that easy to catch bugs become hard to
106 catch race conditions, but the users have spoken.
107 - point out the unspecified signal mask in the documentation, and
108 that this is a race condition regardless of EV_SIGNALFD.
109 - backport inotify code to C89.
110 - inotify file descriptors could leak into child processes.
111 - ev_stat watchers could keep an errornous extra ref on the loop,
112 preventing exit when unregistering all watchers (testcases
113 provided by ry@tinyclouds.org).
114 - implement EV_WIN32_HANDLE_TO_FD and EV_WIN32_CLOSE_FD configuration
115 symbols to make it easier for apps to do their own fd management.
116 - support EV_IDLE_ENABLE being disabled in ev++.h
117 (patch by Didier Spezia).
118 - take advantage of inotify_init1, if available, to set cloexec/nonblock
119 on fd creation, to avoid races.
120 - the signal handling pipe wasn't always initialised under windows
121 (analysed by lekma).
122 - changed minimum glibc requirement from glibc 2.9 to 2.7, for
123 signalfd.
124 - add missing string.h include (Denis F. Latypoff).
125 - only replace ev_stat.prev when we detect an actual difference,
126 so prev is (almost) always different to attr. this might
127 have caused the problems with 04_stat.t.
128 - add ev::timer->remaining () method to C++ API.
129
130 3.8 Sun Aug 9 14:30:45 CEST 2009
131 - incompatible change: do not necessarily reset signal handler
132 to SIG_DFL when a sighandler is stopped.
133 - ev_default_destroy did not properly free or zero some members,
134 potentially causing crashes and memory corruption on repeated
135 ev_default_destroy/ev_default_loop calls.
136 - take advantage of signalfd on GNU/Linux systems.
137 - document that the signal mask might be in an unspecified
138 state when using libev's signal handling.
139 - take advantage of some GNU/Linux calls to set cloexec/nonblock
140 on fd creation, to avoid race conditions.
141
142 3.7 Fri Jul 17 16:36:32 CEST 2009
143 - ev_unloop and ev_loop wrongly used a global variable to exit loops,
144 instead of using a per-loop variable (bug caught by accident...).
145 - the ev_set_io_collect_interval interpretation has changed.
146 - add new functionality: ev_set_userdata, ev_userdata,
147 ev_set_invoke_pending_cb, ev_set_loop_release_cb,
148 ev_invoke_pending, ev_pending_count, together with a long example
149 about thread locking.
150 - add ev_timer_remaining (as requested by Denis F. Latypoff).
151 - add ev_loop_depth.
152 - calling ev_unloop in fork/prepare watchers will no longer poll
153 for new events.
154 - Denis F. Latypoff corrected many typos in example code snippets.
155 - honor autoconf detection of EV_USE_CLOCK_SYSCALL, also double-
156 check that the syscall number is available before trying to
157 use it (reported by ry@tinyclouds).
158 - use GetSystemTimeAsFileTime instead of _timeb on windows, for
159 slightly higher accuracy.
160 - properly declare ev_loop_verify and ev_now_update even when
161 !EV_MULTIPLICITY.
162 - do not compile in any priority code when EV_MAXPRI == EV_MINPRI.
163 - support EV_MINIMAL==2 for a reduced API.
164 - actually 0-initialise struct sigaction when installing signals.
165 - add section on hibernate and stopped processes to ev_timer docs.
166
167 3.6 Tue Apr 28 02:49:30 CEST 2009
168 - multiple timers becoming ready within an event loop iteration
169 will be invoked in the "correct" order now.
170 - do not leave the event loop early just because we have no active
171 watchers, fixing a problem when embedding a kqueue loop
172 that has active kernel events but no registered watchers
173 (reported by blacksand blacksand).
174 - correctly zero the idx values for arrays, so destroying and
175 reinitialising the default loop actually works (patch by
176 Malek Hadj-Ali).
177 - implement ev_suspend and ev_resume.
178 - new EV_CUSTOM revents flag for use by applications.
179 - add documentation section about priorites.
180 - add a glossary to the dcoumentation.
181 - extend the ev_fork description slightly.
182 - optimize a jump out of call_pending.
183
184 3.53 Sun Feb 15 02:38:20 CET 2009
185 - fix a bug in event pipe creation on win32 that would cause a
186 failed assertion on event loop creation (patch by Malek Hadj-Ali).
187 - probe for CLOCK_REALTIME support at runtime as well and fall
188 back to gettimeofday if there is an error, to support older
189 operating systems with newer header files/libraries.
190 - prefer gettimeofday over clock_gettime with USE_CLOCK_SYSCALL
191 (default most everywhere), otherwise not.
192
193 3.52 Wed Jan 7 21:43:02 CET 2009
194 - fix compilation of select backend in fd_set mode when NFDBITS is
195 missing (to get it to compile on QNX, reported by Rodrigo Campos).
196 - better select-nfds handling when select backend is in fd_set mode.
197 - diagnose fd_set overruns when select backend is in fd_set mode.
198 - due to a thinko, instead of disabling everything but
199 select on the borked OS X platform, everything but select was
200 allowed (reported by Emanuele Giaquinta).
201 - actually verify that local and remote port are matching in
202 libev's socketpair emulation, which makes denial-of-service
203 attacks harder (but not impossible - it's windows). Make sure
204 it even works under vista, which thinks that getpeer/sockname
205 should return fantasy port numbers.
206 - include "libev" in all assertion messages for potentially
207 clearer diagnostics.
208 - event_get_version (libevent compatibility) returned
209 a useless string instead of the expected version string
210 (patch by W.C.A. Wijngaards).
211
212 3.51 Wed Dec 24 23:00:11 CET 2008
213 - fix a bug where an inotify watcher was added twice, causing
214 freezes on hash collisions (reported and analysed by Graham Leggett).
215 - new config symbol, EV_USE_CLOCK_SYSCALL, to make libev use
216 a direct syscall - slower, but no dependency on librt et al.
217 - assume negative return values != -1 signals success of port_getn
218 (http://cvs.epicsol.org/cgi/viewcvs.cgi/epic5/source/newio.c?rev=1.52)
219 (no known failure reports, but it doesn't hurt).
220 - fork detection in ev_embed now stops and restarts the watcher
221 automatically.
222 - EXPERIMENTAL: default the method to operator () in ev++.h,
223 to make it nicer to use functors (requested by Benedek László).
224 - fixed const object callbacks in ev++.h.
225 - replaced loop_ref argument of watcher.set (loop) by a direct
226 ev_loop * in ev++.h, to avoid clashes with functor patch.
227 - do not try to watch the empty string via inotify.
228 - inotify watchers could be leaked under certain circumstances.
229 - OS X 10.5 is actually even more broken than earlier versions,
230 so fall back to select on that piece of garbage.
231 - fixed some weirdness in the ev_embed documentation.
232
233 3.49 Wed Nov 19 11:26:53 CET 2008
234 - ev_stat watchers will now use inotify as a mere hint on
235 kernels <2.6.25, or if the filesystem is not in the
236 "known to be good" list.
237 - better mingw32 compatibility (it's not as borked as native win32)
238 (analysed by Roger Pack).
239 - include stdio.h in the example program, as too many people are
240 confused by the weird C language otherwise. I guess the next thing
241 I get told is that the "..." ellipses in the examples don't compile
242 with their C compiler.
243
244 3.48 Thu Oct 30 09:02:37 CET 2008
245 - further optimise away the EPOLL_CTL_ADD/MOD combo in the epoll
246 backend by assuming the kernel event mask hasn't changed if
247 ADD fails with EEXIST.
248 - work around spurious event notification bugs in epoll by using
249 a 32-bit generation counter. recreate kernel state if we receive
250 spurious notifications or unwanted events. this is very costly,
251 but I didn't come up with this horrible design.
252 - use memset to initialise most arrays now and do away with the
253 init functions.
254 - expand time-out strategies into a "Be smart about timeouts" section.
255 - drop the "struct" from all ev_watcher declarations in the
256 documentation and did other clarifications (yeah, it was a mistake
257 to have a struct AND a function called ev_loop).
258 - fix a bug where ev_default would not initialise the default
259 loop again after it was destroyed with ev_default_destroy.
260 - rename syserr to ev_syserr to avoid name clashes when embedding,
261 do similar changes for event.c.
262
263 3.45 Tue Oct 21 21:59:26 CEST 2008
264 - disable inotify usage on linux <2.6.25, as it is broken
265 (reported by Yoann Vandoorselaere).
266 - ev_stat erroneously would try to add inotify watchers
267 even when inotify wasn't available (this should only
268 have a performance impact).
269 - ev_once now passes both timeout and io to the callback if both
270 occur concurrently, instead of giving timeouts precedence.
271 - disable EV_USE_INOTIFY when sys/inotify.h is too old.
272
273 3.44 Mon Sep 29 05:18:39 CEST 2008
274 - embed watchers now automatically invoke ev_loop_fork on the
275 embedded loop when the parent loop forks.
276 - new function: ev_now_update (loop).
277 - verify_watcher was not marked static.
278 - improve the "associating..." manpage section.
279 - documentation tweaks here and there.
280
281 3.43 Sun Jul 6 05:34:41 CEST 2008
282 - include more include files on windows to get struct _stati64
283 (reported by Chris Hulbert, but doesn't quite fix his issue).
284 - add missing #include <io.h> in ev.c on windows (reported by
285 Matt Tolton).
286
287 3.42 Tue Jun 17 12:12:07 CEST 2008
288 - work around yet another windows bug: FD_SET actually adds fd's
289 multiple times to the fd_*SET*, despite official MSN docs claiming
290 otherwise. Reported and well-analysed by Matt Tolton.
291 - define NFDBITS to 0 when EV_SELECT_IS_WINSOCKET to make it compile
292 (reported any analysed by Chris Hulbert).
293 - fix a bug in ev_ebadf (this function is only used to catch
294 programming errors in the libev user). reported by Matt Tolton.
295 - fix a bug in fd_intern on win32 (could lead to compile errors
296 under some circumstances, but would work correctly if it compiles).
297 reported by Matt Tolton.
298 - (try to) work around missing lstat on windows.
299 - pass in the write fd set as except fd set under windows. windows
300 is so uncontrollably lame that it requires this. this means that
301 switching off oobinline is not supported (but tcp/ip doesn't
302 have oob, so that would be stupid anyways.
303 - use posix module symbol to auto-detect monotonic clock presence
304 and some other default values.
305
306 3.41 Fri May 23 18:42:54 CEST 2008
307 - work around an obscure bug in winsocket select: if you
308 provide only empty fd sets then select returns WSAEINVAL. how sucky.
309 - improve timer scheduling stability and reduce use of time_epsilon.
310 - use 1-based 2-heap for EV_MINIMAL, simplifies code, reduces
311 codesize and makes for better cache-efficiency.
312 - use 3-based 4-heap for !EV_MINIMAL. this makes better use
313 of cpu cache lines and gives better growth behaviour than
314 2-based heaps.
315 - cache timestamp within heap for !EV_MINIMAL, to avoid random
316 memory accesses.
317 - document/add EV_USE_4HEAP and EV_HEAP_CACHE_AT.
318 - fix a potential aliasing issue in ev_timer_again.
319 - add/document ev_periodic_at, retract direct access to ->at.
320 - improve ev_stat docs.
321 - add portability requirements section.
322 - fix manpage headers etc.
323 - normalise WSA error codes to lower range on windows.
324 - add consistency check code that can be called automatically
325 or on demand to check for internal structures (ev_loop_verify).
326
327 3.31 Wed Apr 16 20:45:04 CEST 2008
328 - added last minute fix for ev_poll.c by Brandon Black.
329
330 3.3 Wed Apr 16 19:04:10 CEST 2008
331 - event_base_loopexit should return 0 on success
332 (W.C.A. Wijngaards).
333 - added linux eventfd support.
334 - try to autodetect epoll and inotify support
335 by libc header version if not using autoconf.
336 - new symbols: EV_DEFAULT_UC and EV_DEFAULT_UC_.
337 - declare functions defined in ev.h as inline if
338 C99 or gcc are available.
339 - enable inlining with gcc versions 2 and 3.
340 - work around broken poll implementations potentially
341 not clearing revents field in ev_poll (Brandon Black)
342 (no such systems are known at this time).
343 - work around a bug in realloc on openbsd and darwin,
344 also makes the erroneous valgrind complaints
345 go away (noted by various people).
346 - fix ev_async_pending, add c++ wrapper for ev_async
347 (based on patch sent by Johannes Deisenhofer).
348 - add sensible set method to ev::embed.
349 - made integer constants type int in ev.h.
350
351 3.2 Wed Apr 2 17:11:19 CEST 2008
352 - fix a 64 bit overflow issue in the select backend,
353 by using fd_mask instead of int for the mask.
354 - rename internal sighandler to avoid clash with very old perls.
355 - entering ev_loop will not clear the ONESHOT or NONBLOCKING
356 flags of any outer loops anymore.
357 - add ev_async_pending.
358
359 3.1 Thu Mar 13 13:45:22 CET 2008
360 - implement ev_async watchers.
361 - only initialise signal pipe on demand.
362 - make use of sig_atomic_t configurable.
363 - improved documentation.
364
365 3.0 Mon Jan 28 13:14:47 CET 2008
366 - API/ABI bump to version 3.0.
367 - ev++.h includes "ev.h" by default now, not <ev.h>.
368 - slightly improved documentation.
369 - speed up signal detection after a fork.
370 - only optionally return trace status changed in ev_child
371 watchers.
372 - experimental (and undocumented) loop wrappers for ev++.h.
373
374 2.01 Tue Dec 25 08:04:41 CET 2007
375 - separate Changes file.
376 - fix ev_path_set => ev_stat_set typo.
377 - remove event_compat.h from the libev tarball.
378 - change how include files are found.
379 - doc updates.
380 - update licenses, explicitly allow for GPL relicensing.
381
382 2.0 Sat Dec 22 17:47:03 CET 2007
383 - new ev_sleep, ev_set_(io|timeout)_collect_interval.
384 - removed epoll from embeddable fd set.
385 - fix embed watchers.
386 - renamed ev_embed.loop to other.
387 - added exported Symbol tables.
388 - undefine member wrapper macros at the end of ev.c.
389 - respect EV_H in ev++.h.
390
391 1.86 Tue Dec 18 02:36:57 CET 2007
392 - fix memleak on loop destroy (not relevant for perl).
393
394 1.85 Fri Dec 14 20:32:40 CET 2007
395 - fix some aliasing issues w.r.t. timers and periodics
396 (not relevant for perl).
397
398 (for historic versions refer to EV/Changes, found in the Perl interface)
399
400 0.1 Wed Oct 31 21:31:48 CET 2007
401 - original version; hacked together in <24h.
402