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Revision: 1.225
Committed: Sun Feb 20 02:56:23 2011 UTC (13 years, 2 months ago) by root
Branch: MAIN
Changes since 1.224: +8 -0 lines
Log Message:
new floor(), better periodic recalc

File Contents

# User Rev Content
1 root 1.14 Revision history for libev, a high-performance and full-featured event loop.
2 root 1.1
3 root 1.225 TODO: ev_loop_prefork hint?
4    
5     - change the default periodic reschedule function to hopefully be more
6     exact and correct.
7     - document reasonable ranges for interval and offset.
8     - do not rely on -lm anymore: use it when available but use our
9     own floor () if it is missing. This should make it easier to embed.
10    
11 root 1.224 4.04 Wed Feb 16 09:01:51 CET 2011
12     - fix two problems in the native win32 backend, where reuse of fd's
13     with different underlying handles caused handles not to be removed
14     or added to the select set (analyzed and tested by Bert Belder).
15 root 1.221 - do no rely on ceil() in ev_e?poll.c.
16 root 1.222 - backport libev to HP-UX versions before 11 v3.
17 root 1.223 - configure did not detect nanosleep and clock_gettime properly when
18     they are available in the libc (as opposed to -lrt).
19 root 1.221
20 root 1.219 4.03 Tue Jan 11 14:37:25 CET 2011
21 root 1.217 - officially support polling files with all backends.
22 root 1.212 - support files, /dev/zero etc. the same way as select in the epoll
23     backend, by generating events on our own.
24 root 1.217 - ports backend: work around solaris bug 6874410 and many related ones
25     (EINTR, maybe more), with no performance loss (note that the solaris
26     bug report is actually wrong, reality is far more bizarre and broken
27     than that).
28 root 1.209 - define EV_READ/EV_WRITE as macros in event.h, as some programs use
29     #ifdef to test for them.
30 root 1.213 - new (experimental) function: ev_feed_signal.
31     - new (to become default) EVFLAG_NOSIGMASK flag.
32     - new EVBACKEND_MASK symbol.
33 root 1.220 - updated COMMON IDIOMS SECTION.
34 root 1.209
35 root 1.207 4.01 Fri Nov 5 21:51:29 CET 2010
36 root 1.205 - automake fucked it up, apparently, --add-missing -f is not quite enough
37 root 1.206 to make it update its files, so 4.00 didn't install ev++.h and
38     event.h on make install. grrr.
39     - ev_loop(count|depth) didn't return anything (Robin Haberkorn).
40 root 1.203 - change EV_UNDEF to 0xffffffff to silence some overzealous compilers.
41 root 1.204 - use "(libev) " prefix for all libev error messages now.
42 root 1.203
43 root 1.202 4.00 Mon Oct 25 12:32:12 CEST 2010
44 root 1.171 - "PORTING FROM LIBEV 3.X TO 4.X" (in ev.pod) is recommended reading.
45 root 1.161 - ev_embed_stop did not correctly stop the watcher (very good
46     testcase by Vladimir Timofeev).
47 sf-exg 1.191 - ev_run will now always update the current loop time - it erroneously
48 root 1.187 didn't when idle watchers were active, causing timers not to fire.
49 root 1.179 - fix a bug where a timeout of zero caused the timer not to fire
50     in the libevent emulation (testcase by Péter Szabó).
51 root 1.164 - applied win32 fixes by Michael Lenaghan (also James Mansion).
52 root 1.166 - replace EV_MINIMAL by EV_FEATURES.
53 root 1.178 - prefer EPOLL_CTL_ADD over EPOLL_CTL_MOD in some more cases, as it
54     seems the former is *much* faster than the latter.
55 root 1.197 - linux kernel version detection (for inotify bug workarounds)
56     did not work properly.
57 root 1.185 - reduce the number of spurious wake-ups with the ports backend.
58 root 1.158 - remove dependency on sys/queue.h on freebsd (patch by Vanilla Hsu).
59 root 1.186 - do async init within ev_async_start, not ev_async_set, which avoids
60     an API quirk where the set function must be called in the C++ API
61     even when there is nothing to set.
62 root 1.174 - add (undocumented) EV_ENABLE when adding events with kqueue,
63 root 1.175 this might help with OS X, which seems to need it despite documenting
64     not to need it (helpfully pointed out by Tilghman Lesher).
65 root 1.176 - do not use poll by default on freebsd, it's broken (what isn't
66     on freebsd...).
67 root 1.195 - allow to embed epoll on kernels >= 2.6.32.
68 root 1.159 - configure now prepends -O3, not appends it, so one can still
69     override it.
70 root 1.190 - ev.pod: greatly expanded the portability section, added a porting
71     section, a description of watcher states and made lots of minor fixes.
72 root 1.160 - disable poll backend on AIX, the poll header spams the namespace
73     and it's not worth working around dead platforms (reported
74     and analyzed by Aivars Kalvans).
75 root 1.162 - improve header file compatibility of the standalone eventfd code
76     in an obscure case.
77 root 1.163 - implement EV_AVOID_STDIO option.
78     - do not use sscanf to parse linux version number (smaller, faster,
79     no sscanf dependency).
80 root 1.164 - new EV_CHILD_ENABLE and EV_SIGNAL_ENABLE configurable settings.
81 sf-exg 1.172 - update libev.m4 HAVE_CLOCK_SYSCALL test for newer glibcs.
82 root 1.165 - add section on accept() problems to the manpage.
83 root 1.168 - rename EV_TIMEOUT to EV_TIMER.
84 root 1.190 - rename ev_loop_count/depth/verify/loop/unloop.
85 root 1.197 - remove ev_default_destroy and ev_default_fork.
86 root 1.168 - switch to two-digit minor version.
87 root 1.180 - work around an apparent gentoo compiler bug.
88 root 1.181 - define _DARWIN_UNLIMITED_SELECT. just so.
89 root 1.188 - use enum instead of #define for most constants.
90     - improve compatibility to older C++ compilers.
91 root 1.193 - (experimental) ev_run/ev_default_loop/ev_break/ev_loop_new have now
92     default arguments when compiled as C++.
93 root 1.196 - enable automake dependency tracking.
94 root 1.197 - ev_loop_new no longer leaks memory when loop creation failed.
95 root 1.198 - new ev_cleanup watcher type.
96 root 1.157
97 root 1.156 3.9 Thu Dec 31 07:59:59 CET 2009
98 root 1.155 - signalfd is no longer used by default and has to be requested
99     explicitly - this means that easy to catch bugs become hard to
100     catch race conditions, but the users have spoken.
101     - point out the unspecified signal mask in the documentation, and
102     that this is a race condition regardless of EV_SIGNALFD.
103 root 1.142 - backport inotify code to C89.
104 root 1.148 - inotify file descriptors could leak into child processes.
105 root 1.151 - ev_stat watchers could keep an errornous extra ref on the loop,
106     preventing exit when unregistering all watchers (testcases
107 root 1.150 provided by ry@tinyclouds.org).
108 root 1.143 - implement EV_WIN32_HANDLE_TO_FD and EV_WIN32_CLOSE_FD configuration
109 root 1.145 symbols to make it easier for apps to do their own fd management.
110 root 1.144 - support EV_IDLE_ENABLE being disabled in ev++.h
111     (patch by Didier Spezia).
112 root 1.147 - take advantage of inotify_init1, if available, to set cloexec/nonblock
113     on fd creation, to avoid races.
114 root 1.150 - the signal handling pipe wasn't always initialised under windows
115     (analysed by lekma).
116 root 1.146 - changed minimum glibc requirement from glibc 2.9 to 2.7, for
117     signalfd.
118 root 1.152 - add missing string.h include (Denis F. Latypoff).
119 root 1.153 - only replace ev_stat.prev when we detect an actual difference,
120     so prev is (almost) always different to attr. this might
121 sf-exg 1.191 have caused the problems with 04_stat.t.
122 root 1.154 - add ev::timer->remaining () method to C++ API.
123 root 1.142
124 root 1.141 3.8 Sun Aug 9 14:30:45 CEST 2009
125 root 1.133 - incompatible change: do not necessarily reset signal handler
126     to SIG_DFL when a sighandler is stopped.
127 root 1.135 - ev_default_destroy did not properly free or zero some members,
128 sf-exg 1.191 potentially causing crashes and memory corruption on repeated
129 root 1.134 ev_default_destroy/ev_default_loop calls.
130 root 1.133 - take advantage of signalfd on GNU/Linux systems.
131     - document that the signal mask might be in an unspecified
132     state when using libev's signal handling.
133 root 1.136 - take advantage of some GNU/Linux calls to set cloexec/nonblock
134     on fd creation, to avoid race conditions.
135 root 1.132
136 root 1.131 3.7 Fri Jul 17 16:36:32 CEST 2009
137 root 1.128 - ev_unloop and ev_loop wrongly used a global variable to exit loops,
138     instead of using a per-loop variable (bug caught by accident...).
139     - the ev_set_io_collect_interval interpretation has changed.
140     - add new functionality: ev_set_userdata, ev_userdata,
141 root 1.126 ev_set_invoke_pending_cb, ev_set_loop_release_cb,
142 root 1.132 ev_invoke_pending, ev_pending_count, together with a long example
143     about thread locking.
144 root 1.128 - add ev_timer_remaining (as requested by Denis F. Latypoff).
145     - add ev_loop_depth.
146 root 1.124 - calling ev_unloop in fork/prepare watchers will no longer poll
147     for new events.
148 root 1.115 - Denis F. Latypoff corrected many typos in example code snippets.
149     - honor autoconf detection of EV_USE_CLOCK_SYSCALL, also double-
150     check that the syscall number is available before trying to
151     use it (reported by ry@tinyclouds).
152 root 1.117 - use GetSystemTimeAsFileTime instead of _timeb on windows, for
153 root 1.116 slightly higher accuracy.
154 root 1.122 - properly declare ev_loop_verify and ev_now_update even when
155     !EV_MULTIPLICITY.
156 root 1.121 - do not compile in any priority code when EV_MAXPRI == EV_MINPRI.
157 root 1.123 - support EV_MINIMAL==2 for a reduced API.
158 root 1.125 - actually 0-initialise struct sigaction when installing signals.
159 root 1.127 - add section on hibernate and stopped processes to ev_timer docs.
160 root 1.115
161 root 1.113 3.6 Tue Apr 28 02:49:30 CEST 2009
162 root 1.107 - multiple timers becoming ready within an event loop iteration
163     will be invoked in the "correct" order now.
164 root 1.105 - do not leave the event loop early just because we have no active
165     watchers, fixing a problem when embedding a kqueue loop
166     that has active kernel events but no registered watchers
167     (reported by blacksand blacksand).
168 root 1.102 - correctly zero the idx values for arrays, so destroying and
169     reinitialising the default loop actually works (patch by
170     Malek Hadj-Ali).
171 root 1.108 - implement ev_suspend and ev_resume.
172 root 1.106 - new EV_CUSTOM revents flag for use by applications.
173 root 1.109 - add documentation section about priorites.
174     - add a glossary to the dcoumentation.
175 root 1.111 - extend the ev_fork description slightly.
176 root 1.112 - optimize a jump out of call_pending.
177 root 1.102
178 root 1.101 3.53 Sun Feb 15 02:38:20 CET 2009
179     - fix a bug in event pipe creation on win32 that would cause a
180     failed assertion on event loop creation (patch by Malek Hadj-Ali).
181 root 1.100 - probe for CLOCK_REALTIME support at runtime as well and fall
182     back to gettimeofday if there is an error, to support older
183     operating systems with newer header files/libraries.
184     - prefer gettimeofday over clock_gettime with USE_CLOCK_SYSCALL
185     (default most everywhere), otherwise not.
186    
187 root 1.99 3.52 Wed Jan 7 21:43:02 CET 2009
188 root 1.97 - fix compilation of select backend in fd_set mode when NFDBITS is
189     missing (to get it to compile on QNX, reported by Rodrigo Campos).
190     - better select-nfds handling when select backend is in fd_set mode.
191     - diagnose fd_set overruns when select backend is in fd_set mode.
192     - due to a thinko, instead of disabling everything but
193     select on the borked OS X platform, everything but select was
194     allowed (reported by Emanuele Giaquinta).
195 root 1.95 - actually verify that local and remote port are matching in
196     libev's socketpair emulation, which makes denial-of-service
197     attacks harder (but not impossible - it's windows). Make sure
198 root 1.96 it even works under vista, which thinks that getpeer/sockname
199     should return fantasy port numbers.
200 root 1.100 - include "libev" in all assertion messages for potentially
201 root 1.97 clearer diagnostics.
202 root 1.98 - event_get_version (libevent compatibility) returned
203     a useless string instead of the expected version string
204     (patch by W.C.A. Wijngaards).
205 root 1.95
206 root 1.94 3.51 Wed Dec 24 23:00:11 CET 2008
207 root 1.91 - fix a bug where an inotify watcher was added twice, causing
208 root 1.92 freezes on hash collisions (reported and analysed by Graham Leggett).
209 root 1.87 - new config symbol, EV_USE_CLOCK_SYSCALL, to make libev use
210     a direct syscall - slower, but no dependency on librt et al.
211 root 1.88 - assume negative return values != -1 signals success of port_getn
212     (http://cvs.epicsol.org/cgi/viewcvs.cgi/epic5/source/newio.c?rev=1.52)
213     (no known failure reports, but it doesn't hurt).
214 root 1.93 - fork detection in ev_embed now stops and restarts the watcher
215     automatically.
216 root 1.89 - EXPERIMENTAL: default the method to operator () in ev++.h,
217     to make it nicer to use functors (requested by Benedek László).
218     - fixed const object callbacks in ev++.h.
219 root 1.90 - replaced loop_ref argument of watcher.set (loop) by a direct
220     ev_loop * in ev++.h, to avoid clashes with functor patch.
221 root 1.91 - do not try to watch the empty string via inotify.
222 root 1.92 - inotify watchers could be leaked under certain circumstances.
223     - OS X 10.5 is actually even more broken than earlier versions,
224     so fall back to select on that piece of garbage.
225 root 1.93 - fixed some weirdness in the ev_embed documentation.
226 root 1.87
227 root 1.86 3.49 Wed Nov 19 11:26:53 CET 2008
228 root 1.83 - ev_stat watchers will now use inotify as a mere hint on
229     kernels <2.6.25, or if the filesystem is not in the
230     "known to be good" list.
231 root 1.84 - better mingw32 compatibility (it's not as borked as native win32)
232     (analysed by Roger Pack).
233 root 1.85 - include stdio.h in the example program, as too many people are
234     confused by the weird C language otherwise. I guess the next thing
235     I get told is that the "..." ellipses in the examples don't compile
236     with their C compiler.
237 root 1.83
238 root 1.80 3.48 Thu Oct 30 09:02:37 CET 2008
239 root 1.71 - further optimise away the EPOLL_CTL_ADD/MOD combo in the epoll
240     backend by assuming the kernel event mask hasn't changed if
241     ADD fails with EEXIST.
242 root 1.75 - work around spurious event notification bugs in epoll by using
243 root 1.77 a 32-bit generation counter. recreate kernel state if we receive
244 root 1.78 spurious notifications or unwanted events. this is very costly,
245     but I didn't come up with this horrible design.
246 root 1.71 - use memset to initialise most arrays now and do away with the
247     init functions.
248 root 1.72 - expand time-out strategies into a "Be smart about timeouts" section.
249     - drop the "struct" from all ev_watcher declarations in the
250 root 1.73 documentation and did other clarifications (yeah, it was a mistake
251     to have a struct AND a function called ev_loop).
252 root 1.74 - fix a bug where ev_default would not initialise the default
253     loop again after it was destroyed with ev_default_destroy.
254 root 1.79 - rename syserr to ev_syserr to avoid name clashes when embedding,
255     do similar changes for event.c.
256 root 1.71
257 root 1.69 3.45 Tue Oct 21 21:59:26 CEST 2008
258 root 1.67 - disable inotify usage on linux <2.6.25, as it is broken
259     (reported by Yoann Vandoorselaere).
260 sf-exg 1.191 - ev_stat erroneously would try to add inotify watchers
261 root 1.68 even when inotify wasn't available (this should only
262 root 1.67 have a performance impact).
263 root 1.65 - ev_once now passes both timeout and io to the callback if both
264     occur concurrently, instead of giving timeouts precedence.
265 root 1.66 - disable EV_USE_INOTIFY when sys/inotify.h is too old.
266 root 1.65
267 root 1.62 3.44 Mon Sep 29 05:18:39 CEST 2008
268     - embed watchers now automatically invoke ev_loop_fork on the
269     embedded loop when the parent loop forks.
270 root 1.58 - new function: ev_now_update (loop).
271 root 1.57 - verify_watcher was not marked static.
272 root 1.59 - improve the "associating..." manpage section.
273 root 1.60 - documentation tweaks here and there.
274 root 1.57
275 root 1.56 3.43 Sun Jul 6 05:34:41 CEST 2008
276 root 1.54 - include more include files on windows to get struct _stati64
277 root 1.56 (reported by Chris Hulbert, but doesn't quite fix his issue).
278 root 1.53 - add missing #include <io.h> in ev.c on windows (reported by
279     Matt Tolton).
280    
281 root 1.52 3.42 Tue Jun 17 12:12:07 CEST 2008
282 root 1.50 - work around yet another windows bug: FD_SET actually adds fd's
283     multiple times to the fd_*SET*, despite official MSN docs claiming
284 root 1.51 otherwise. Reported and well-analysed by Matt Tolton.
285     - define NFDBITS to 0 when EV_SELECT_IS_WINSOCKET to make it compile
286 root 1.48 (reported any analysed by Chris Hulbert).
287 root 1.49 - fix a bug in ev_ebadf (this function is only used to catch
288     programming errors in the libev user). reported by Matt Tolton.
289     - fix a bug in fd_intern on win32 (could lead to compile errors
290     under some circumstances, but would work correctly if it compiles).
291     reported by Matt Tolton.
292 root 1.50 - (try to) work around missing lstat on windows.
293 root 1.45 - pass in the write fd set as except fd set under windows. windows
294 root 1.46 is so uncontrollably lame that it requires this. this means that
295     switching off oobinline is not supported (but tcp/ip doesn't
296     have oob, so that would be stupid anyways.
297 root 1.47 - use posix module symbol to auto-detect monotonic clock presence
298     and some other default values.
299 root 1.45
300 root 1.44 3.41 Fri May 23 18:42:54 CEST 2008
301 root 1.46 - work around an obscure bug in winsocket select: if you
302 root 1.40 provide only empty fd sets then select returns WSAEINVAL. how sucky.
303 root 1.41 - improve timer scheduling stability and reduce use of time_epsilon.
304 root 1.36 - use 1-based 2-heap for EV_MINIMAL, simplifies code, reduces
305     codesize and makes for better cache-efficiency.
306     - use 3-based 4-heap for !EV_MINIMAL. this makes better use
307     of cpu cache lines and gives better growth behaviour than
308     2-based heaps.
309 root 1.38 - cache timestamp within heap for !EV_MINIMAL, to avoid random
310     memory accesses.
311     - document/add EV_USE_4HEAP and EV_HEAP_CACHE_AT.
312 root 1.33 - fix a potential aliasing issue in ev_timer_again.
313 root 1.35 - add/document ev_periodic_at, retract direct access to ->at.
314     - improve ev_stat docs.
315     - add portability requirements section.
316 root 1.39 - fix manpage headers etc.
317 root 1.40 - normalise WSA error codes to lower range on windows.
318 root 1.43 - add consistency check code that can be called automatically
319     or on demand to check for internal structures (ev_loop_verify).
320 root 1.31
321 root 1.30 3.31 Wed Apr 16 20:45:04 CEST 2008
322     - added last minute fix for ev_poll.c by Brandon Black.
323 root 1.29
324 root 1.28 3.3 Wed Apr 16 19:04:10 CEST 2008
325 root 1.23 - event_base_loopexit should return 0 on success
326     (W.C.A. Wijngaards).
327 root 1.20 - added linux eventfd support.
328     - try to autodetect epoll and inotify support
329     by libc header version if not using autoconf.
330 root 1.21 - new symbols: EV_DEFAULT_UC and EV_DEFAULT_UC_.
331     - declare functions defined in ev.h as inline if
332     C99 or gcc are available.
333     - enable inlining with gcc versions 2 and 3.
334 root 1.25 - work around broken poll implementations potentially
335     not clearing revents field in ev_poll (Brandon Black)
336     (no such systems are known at this time).
337 root 1.23 - work around a bug in realloc on openbsd and darwin,
338 sf-exg 1.191 also makes the erroneous valgrind complaints
339 root 1.23 go away (noted by various people).
340 root 1.26 - fix ev_async_pending, add c++ wrapper for ev_async
341 sf-exg 1.191 (based on patch sent by Johannes Deisenhofer).
342 root 1.26 - add sensible set method to ev::embed.
343 root 1.27 - made integer constants type int in ev.h.
344 root 1.20
345 root 1.19 3.2 Wed Apr 2 17:11:19 CEST 2008
346 root 1.15 - fix a 64 bit overflow issue in the select backend,
347     by using fd_mask instead of int for the mask.
348 root 1.16 - rename internal sighandler to avoid clash with very old perls.
349 root 1.18 - entering ev_loop will not clear the ONESHOT or NONBLOCKING
350     flags of any outer loops anymore.
351 root 1.17 - add ev_async_pending.
352 root 1.15
353 root 1.14 3.1 Thu Mar 13 13:45:22 CET 2008
354 root 1.12 - implement ev_async watchers.
355 root 1.10 - only initialise signal pipe on demand.
356     - make use of sig_atomic_t configurable.
357 root 1.14 - improved documentation.
358 root 1.10
359 root 1.9 3.0 Mon Jan 28 13:14:47 CET 2008
360 root 1.6 - API/ABI bump to version 3.0.
361 root 1.4 - ev++.h includes "ev.h" by default now, not <ev.h>.
362     - slightly improved documentation.
363 root 1.5 - speed up signal detection after a fork.
364 root 1.6 - only optionally return trace status changed in ev_child
365     watchers.
366 root 1.8 - experimental (and undocumented) loop wrappers for ev++.h.
367 root 1.4
368 root 1.2 2.01 Tue Dec 25 08:04:41 CET 2007
369 root 1.3 - separate Changes file.
370 root 1.2 - fix ev_path_set => ev_stat_set typo.
371     - remove event_compat.h from the libev tarball.
372     - change how include files are found.
373     - doc updates.
374     - update licenses, explicitly allow for GPL relicensing.
375    
376     2.0 Sat Dec 22 17:47:03 CET 2007
377     - new ev_sleep, ev_set_(io|timeout)_collect_interval.
378     - removed epoll from embeddable fd set.
379     - fix embed watchers.
380     - renamed ev_embed.loop to other.
381     - added exported Symbol tables.
382     - undefine member wrapper macros at the end of ev.c.
383     - respect EV_H in ev++.h.
384    
385     1.86 Tue Dec 18 02:36:57 CET 2007
386     - fix memleak on loop destroy (not relevant for perl).
387    
388     1.85 Fri Dec 14 20:32:40 CET 2007
389     - fix some aliasing issues w.r.t. timers and periodics
390     (not relevant for perl).
391    
392     (for historic versions refer to EV/Changes, found in the Perl interface)
393    
394 root 1.1 0.1 Wed Oct 31 21:31:48 CET 2007
395     - original version; hacked together in <24h.
396