[ViewVC] Annotation of: cvs/libev/Changes

Revision history for libev, a high-performance and full-featured event loop.

        - backport inotify code to C89.
        - inotify file descriptors could leak into child processes.
        - implement EV_WIN32_HANDLE_TO_FD and EV_WIN32_CLOSE_FD configuration
          symbols to make it easier for apps to do their own fd management.
        - support EV_IDLE_ENABLE being disabled in ev++.h
          (patch by Didier Spezia).
        - point out the unspecified signal mask in the documentation.
        - take advantage of inotify_init1, if available, to set cloexec/nonblock
          on fd creation, to avoid races.
        - changed minimum glibc requirement from glibc 2.9 to 2.7, for
          signalfd.

3.8  Sun Aug  9 14:30:45 CEST 2009
        - incompatible change: do not necessarily reset signal handler
          to SIG_DFL when a sighandler is stopped.
        - ev_default_destroy did not properly free or zero some members,
          potentially causing crashes and memory corruption on repated
          ev_default_destroy/ev_default_loop calls.
        - take advantage of signalfd on GNU/Linux systems.
        - document that the signal mask might be in an unspecified
          state when using libev's signal handling.
        - take advantage of some GNU/Linux calls to set cloexec/nonblock
          on fd creation, to avoid race conditions.

3.7  Fri Jul 17 16:36:32 CEST 2009
        - ev_unloop and ev_loop wrongly used a global variable to exit loops,
          instead of using a per-loop variable (bug caught by accident...).
        - the ev_set_io_collect_interval interpretation has changed.
        - add new functionality: ev_set_userdata, ev_userdata,
          ev_set_invoke_pending_cb, ev_set_loop_release_cb,
          ev_invoke_pending, ev_pending_count, together with a long example
          about thread locking.
        - add ev_timer_remaining (as requested by Denis F. Latypoff).
        - add ev_loop_depth.
        - calling ev_unloop in fork/prepare watchers will no longer poll
          for new events.
        - Denis F. Latypoff corrected many typos in example code snippets.
        - honor autoconf detection of EV_USE_CLOCK_SYSCALL, also double-
          check that the syscall number is available before trying to
          use it (reported by ry@tinyclouds).
        - use GetSystemTimeAsFileTime instead of _timeb on windows, for
          slightly higher accuracy.
        - properly declare ev_loop_verify and ev_now_update even when
          !EV_MULTIPLICITY.
        - do not compile in any priority code when EV_MAXPRI == EV_MINPRI.
        - support EV_MINIMAL==2 for a reduced API.
        - actually 0-initialise struct sigaction when installing signals.
        - add section on hibernate and stopped processes to ev_timer docs.

3.6  Tue Apr 28 02:49:30 CEST 2009
        - multiple timers becoming ready within an event loop iteration
          will be invoked in the "correct" order now.
        - do not leave the event loop early just because we have no active
          watchers, fixing a problem when embedding a kqueue loop
          that has active kernel events but no registered watchers
          (reported by blacksand blacksand).
        - correctly zero the idx values for arrays, so destroying and
          reinitialising the default loop actually works (patch by
          Malek Hadj-Ali).
        - implement ev_suspend and ev_resume.
        - new EV_CUSTOM revents flag for use by applications.
        - add documentation section about priorites.
        - add a glossary to the dcoumentation.
        - extend the ev_fork description slightly.
        - optimize a jump out of call_pending.

3.53 Sun Feb 15 02:38:20 CET 2009
        - fix a bug in event pipe creation on win32 that would cause a
          failed assertion on event loop creation (patch by Malek Hadj-Ali).
        - probe for CLOCK_REALTIME support at runtime as well and fall
          back to gettimeofday if there is an error, to support older
          operating systems with newer header files/libraries.
        - prefer gettimeofday over clock_gettime with USE_CLOCK_SYSCALL
          (default most everywhere), otherwise not.

3.52 Wed Jan  7 21:43:02 CET 2009
        - fix compilation of select backend in fd_set mode when NFDBITS is
          missing (to get it to compile on QNX, reported by Rodrigo Campos).
        - better select-nfds handling when select backend is in fd_set mode.
        - diagnose fd_set overruns when select backend is in fd_set mode.
        - due to a thinko, instead of disabling everything but
          select on the borked OS X platform, everything but select was
          allowed (reported by Emanuele Giaquinta).
        - actually verify that local and remote port are matching in
          libev's socketpair emulation, which makes denial-of-service
          attacks harder (but not impossible - it's windows). Make sure
          it even works under vista, which thinks that getpeer/sockname
          should return fantasy port numbers.
        - include "libev" in all assertion messages for potentially
          clearer diagnostics.
        - event_get_version (libevent compatibility) returned
          a useless string instead of the expected version string
          (patch by W.C.A. Wijngaards).

3.51 Wed Dec 24 23:00:11 CET 2008
        - fix a bug where an inotify watcher was added twice, causing
          freezes on hash collisions (reported and analysed by Graham Leggett).
        - new config symbol, EV_USE_CLOCK_SYSCALL, to make libev use
          a direct syscall - slower, but no dependency on librt et al.
        - assume negative return values != -1 signals success of port_getn
          (http://cvs.epicsol.org/cgi/viewcvs.cgi/epic5/source/newio.c?rev=1.52)
          (no known failure reports, but it doesn't hurt).
        - fork detection in ev_embed now stops and restarts the watcher
          automatically.
        - EXPERIMENTAL: default the method to operator () in ev++.h,
          to make it nicer to use functors (requested by Benedek László).
        - fixed const object callbacks in ev++.h.
        - replaced loop_ref argument of watcher.set (loop) by a direct
          ev_loop * in ev++.h, to avoid clashes with functor patch.
        - do not try to watch the empty string via inotify.
        - inotify watchers could be leaked under certain circumstances.
        - OS X 10.5 is actually even more broken than earlier versions,
          so fall back to select on that piece of garbage.
        - fixed some weirdness in the ev_embed documentation.

3.49 Wed Nov 19 11:26:53 CET 2008
        - ev_stat watchers will now use inotify as a mere hint on
          kernels <2.6.25, or if the filesystem is not in the
          "known to be good" list.
        - better mingw32 compatibility (it's not as borked as native win32)
          (analysed by Roger Pack).
        - include stdio.h in the example program, as too many people are
          confused by the weird C language otherwise. I guess the next thing
          I get told is that the "..." ellipses in the examples don't compile
          with their C compiler.

3.48 Thu Oct 30 09:02:37 CET 2008
        - further optimise away the EPOLL_CTL_ADD/MOD combo in the epoll
          backend by assuming the kernel event mask hasn't changed if
          ADD fails with EEXIST.
        - work around spurious event notification bugs in epoll by using
          a 32-bit generation counter. recreate kernel state if we receive
          spurious notifications or unwanted events. this is very costly,
          but I didn't come up with this horrible design.
        - use memset to initialise most arrays now and do away with the
          init functions.
        - expand time-out strategies into a "Be smart about timeouts" section.
        - drop the "struct" from all ev_watcher declarations in the
          documentation and did other clarifications (yeah, it was a mistake
          to have a struct AND a function called ev_loop).
        - fix a bug where ev_default would not initialise the default
          loop again after it was destroyed with ev_default_destroy.
        - rename syserr to ev_syserr to avoid name clashes when embedding,
          do similar changes for event.c.

3.45 Tue Oct 21 21:59:26 CEST 2008
        - disable inotify usage on linux <2.6.25, as it is broken
          (reported by Yoann Vandoorselaere).
        - ev_stat errornously would try to add inotify watchers
          even when inotify wasn't available (this should only
          have a performance impact).
        - ev_once now passes both timeout and io to the callback if both
          occur concurrently, instead of giving timeouts precedence.
        - disable EV_USE_INOTIFY when sys/inotify.h is too old.

3.44 Mon Sep 29 05:18:39 CEST 2008
        - embed watchers now automatically invoke ev_loop_fork on the
          embedded loop when the parent loop forks.
        - new function: ev_now_update (loop).
        - verify_watcher was not marked static.
        - improve the "associating..." manpage section.
        - documentation tweaks here and there.

3.43 Sun Jul  6 05:34:41 CEST 2008
        - include more include files on windows to get struct _stati64
          (reported by Chris Hulbert, but doesn't quite fix his issue).
        - add missing #include <io.h> in ev.c on windows (reported by
          Matt Tolton).

3.42 Tue Jun 17 12:12:07 CEST 2008
        - work around yet another windows bug: FD_SET actually adds fd's
          multiple times to the fd_*SET*, despite official MSN docs claiming
          otherwise. Reported and well-analysed by Matt Tolton.
        - define NFDBITS to 0 when EV_SELECT_IS_WINSOCKET to make it compile
          (reported any analysed by Chris Hulbert).
        - fix a bug in ev_ebadf (this function is only used to catch
          programming errors in the libev user). reported by Matt Tolton.
        - fix a bug in fd_intern on win32 (could lead to compile errors
          under some circumstances, but would work correctly if it compiles).
          reported by Matt Tolton.
        - (try to) work around missing lstat on windows.
        - pass in the write fd set as except fd set under windows. windows
          is so uncontrollably lame that it requires this. this means that
          switching off oobinline is not supported (but tcp/ip doesn't
          have oob, so that would be stupid anyways.
        - use posix module symbol to auto-detect monotonic clock presence
          and some other default values.

3.41 Fri May 23 18:42:54 CEST 2008
        - work around an obscure bug in winsocket select: if you
          provide only empty fd sets then select returns WSAEINVAL. how sucky.
        - improve timer scheduling stability and reduce use of time_epsilon.
        - use 1-based 2-heap for EV_MINIMAL, simplifies code, reduces
          codesize and makes for better cache-efficiency.
        - use 3-based 4-heap for !EV_MINIMAL. this makes better use
          of cpu cache lines and gives better growth behaviour than
          2-based heaps.
        - cache timestamp within heap for !EV_MINIMAL, to avoid random
          memory accesses.
        - document/add EV_USE_4HEAP and EV_HEAP_CACHE_AT.
        - fix a potential aliasing issue in ev_timer_again.
        - add/document ev_periodic_at, retract direct access to ->at.
        - improve ev_stat docs.
        - add portability requirements section.
        - fix manpage headers etc.
        - normalise WSA error codes to lower range on windows.
        - add consistency check code that can be called automatically
          or on demand to check for internal structures (ev_loop_verify).

3.31 Wed Apr 16 20:45:04 CEST 2008
        - added last minute fix for ev_poll.c by Brandon Black.

3.3  Wed Apr 16 19:04:10 CEST 2008
        - event_base_loopexit should return 0 on success
          (W.C.A. Wijngaards).
        - added linux eventfd support.
        - try to autodetect epoll and inotify support
          by libc header version if not using autoconf.
        - new symbols: EV_DEFAULT_UC and EV_DEFAULT_UC_.
        - declare functions defined in ev.h as inline if
          C99 or gcc are available.
        - enable inlining with gcc versions 2 and 3.
        - work around broken poll implementations potentially
          not clearing revents field in ev_poll (Brandon Black)
          (no such systems are known at this time).
        - work around a bug in realloc on openbsd and darwin,
          also makes the errornous valgrind complaints
          go away (noted by various people).
        - fix ev_async_pending, add c++ wrapper for ev_async
          (based on patch sent by Johannes Deisenhofer.
        - add sensible set method to ev::embed.
        - made integer constants type int in ev.h.

3.2  Wed Apr  2 17:11:19 CEST 2008
        - fix a 64 bit overflow issue in the select backend,
          by using fd_mask instead of int for the mask.
        - rename internal sighandler to avoid clash with very old perls.
        - entering ev_loop will not clear the ONESHOT or NONBLOCKING
          flags of any outer loops anymore.
        - add ev_async_pending.

3.1  Thu Mar 13 13:45:22 CET 2008
        - implement ev_async watchers.
        - only initialise signal pipe on demand.
        - make use of sig_atomic_t configurable.
        - improved documentation.

3.0  Mon Jan 28 13:14:47 CET 2008
        - API/ABI bump to version 3.0.
        - ev++.h includes "ev.h" by default now, not <ev.h>.
        - slightly improved documentation.
        - speed up signal detection after a fork.
        - only optionally return trace status changed in ev_child
          watchers.
        - experimental (and undocumented) loop wrappers for ev++.h.

2.01 Tue Dec 25 08:04:41 CET 2007
        - separate Changes file.
        - fix ev_path_set => ev_stat_set typo.
        - remove event_compat.h from the libev tarball.
        - change how include files are found.
        - doc updates.
        - update licenses, explicitly allow for GPL relicensing.

2.0  Sat Dec 22 17:47:03 CET 2007
        - new ev_sleep, ev_set_(io|timeout)_collect_interval.
        - removed epoll from embeddable fd set.
        - fix embed watchers.
        - renamed ev_embed.loop to other.
        - added exported Symbol tables.
        - undefine member wrapper macros at the end of ev.c.
        - respect EV_H in ev++.h.

1.86 Tue Dec 18 02:36:57 CET 2007
        - fix memleak on loop destroy (not relevant for perl).

1.85 Fri Dec 14 20:32:40 CET 2007
        - fix some aliasing issues w.r.t. timers and periodics
          (not relevant for perl).

(for historic versions refer to EV/Changes, found in the Perl interface)

0.1  Wed Oct 31 21:31:48 CET 2007
        - original version; hacked together in <24h.

Revision:	1.148
Committed:	Wed Aug 26 17:50:11 2009 UTC (14 years, 9 months ago) by root
Branch:	MAIN
Changes since 1.147:	+1 -2 lines
Log Message:	* empty log message *
#	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	1.142	- backport inotify code to C89.
4	root	1.148	- inotify file descriptors could leak into child processes.
5	root	1.143	- implement EV_WIN32_HANDLE_TO_FD and EV_WIN32_CLOSE_FD configuration
6	root	1.145	symbols to make it easier for apps to do their own fd management.
7	root	1.144	- support EV_IDLE_ENABLE being disabled in ev++.h
8			(patch by Didier Spezia).
9	root	1.145	- point out the unspecified signal mask in the documentation.
10	root	1.147	- take advantage of inotify_init1, if available, to set cloexec/nonblock
11			on fd creation, to avoid races.
12	root	1.146	- changed minimum glibc requirement from glibc 2.9 to 2.7, for
13			signalfd.
14	root	1.142
15	root	1.141	3.8 Sun Aug 9 14:30:45 CEST 2009
16	root	1.133	- incompatible change: do not necessarily reset signal handler
17			to SIG_DFL when a sighandler is stopped.
18	root	1.135	- ev_default_destroy did not properly free or zero some members,
19	root	1.134	potentially causing crashes and memory corruption on repated
20			ev_default_destroy/ev_default_loop calls.
21	root	1.133	- take advantage of signalfd on GNU/Linux systems.
22			- document that the signal mask might be in an unspecified
23			state when using libev's signal handling.
24	root	1.136	- take advantage of some GNU/Linux calls to set cloexec/nonblock
25			on fd creation, to avoid race conditions.
26	root	1.132
27	root	1.131	3.7 Fri Jul 17 16:36:32 CEST 2009
28	root	1.128	- ev_unloop and ev_loop wrongly used a global variable to exit loops,
29			instead of using a per-loop variable (bug caught by accident...).
30			- the ev_set_io_collect_interval interpretation has changed.
31			- add new functionality: ev_set_userdata, ev_userdata,
32	root	1.126	ev_set_invoke_pending_cb, ev_set_loop_release_cb,
33	root	1.132	ev_invoke_pending, ev_pending_count, together with a long example
34			about thread locking.
35	root	1.128	- add ev_timer_remaining (as requested by Denis F. Latypoff).
36			- add ev_loop_depth.
37	root	1.124	- calling ev_unloop in fork/prepare watchers will no longer poll
38			for new events.
39	root	1.115	- Denis F. Latypoff corrected many typos in example code snippets.
40			- honor autoconf detection of EV_USE_CLOCK_SYSCALL, also double-
41			check that the syscall number is available before trying to
42			use it (reported by ry@tinyclouds).
43	root	1.117	- use GetSystemTimeAsFileTime instead of _timeb on windows, for
44	root	1.116	slightly higher accuracy.
45	root	1.122	- properly declare ev_loop_verify and ev_now_update even when
46			!EV_MULTIPLICITY.
47	root	1.121	- do not compile in any priority code when EV_MAXPRI == EV_MINPRI.
48	root	1.123	- support EV_MINIMAL==2 for a reduced API.
49	root	1.125	- actually 0-initialise struct sigaction when installing signals.
50	root	1.127	- add section on hibernate and stopped processes to ev_timer docs.
51	root	1.115
52	root	1.113	3.6 Tue Apr 28 02:49:30 CEST 2009
53	root	1.107	- multiple timers becoming ready within an event loop iteration
54			will be invoked in the "correct" order now.
55	root	1.105	- do not leave the event loop early just because we have no active
56			watchers, fixing a problem when embedding a kqueue loop
57			that has active kernel events but no registered watchers
58			(reported by blacksand blacksand).
59	root	1.102	- correctly zero the idx values for arrays, so destroying and
60			reinitialising the default loop actually works (patch by
61			Malek Hadj-Ali).
62	root	1.108	- implement ev_suspend and ev_resume.
63	root	1.106	- new EV_CUSTOM revents flag for use by applications.
64	root	1.109	- add documentation section about priorites.
65			- add a glossary to the dcoumentation.
66	root	1.111	- extend the ev_fork description slightly.
67	root	1.112	- optimize a jump out of call_pending.
68	root	1.102
69	root	1.101	3.53 Sun Feb 15 02:38:20 CET 2009
70			- fix a bug in event pipe creation on win32 that would cause a
71			failed assertion on event loop creation (patch by Malek Hadj-Ali).
72	root	1.100	- probe for CLOCK_REALTIME support at runtime as well and fall
73			back to gettimeofday if there is an error, to support older
74			operating systems with newer header files/libraries.
75			- prefer gettimeofday over clock_gettime with USE_CLOCK_SYSCALL
76			(default most everywhere), otherwise not.
77
78	root	1.99	3.52 Wed Jan 7 21:43:02 CET 2009
79	root	1.97	- fix compilation of select backend in fd_set mode when NFDBITS is
80			missing (to get it to compile on QNX, reported by Rodrigo Campos).
81			- better select-nfds handling when select backend is in fd_set mode.
82			- diagnose fd_set overruns when select backend is in fd_set mode.
83			- due to a thinko, instead of disabling everything but
84			select on the borked OS X platform, everything but select was
85			allowed (reported by Emanuele Giaquinta).
86	root	1.95	- actually verify that local and remote port are matching in
87			libev's socketpair emulation, which makes denial-of-service
88			attacks harder (but not impossible - it's windows). Make sure
89	root	1.96	it even works under vista, which thinks that getpeer/sockname
90			should return fantasy port numbers.
91	root	1.100	- include "libev" in all assertion messages for potentially
92	root	1.97	clearer diagnostics.
93	root	1.98	- event_get_version (libevent compatibility) returned
94			a useless string instead of the expected version string
95			(patch by W.C.A. Wijngaards).
96	root	1.95
97	root	1.94	3.51 Wed Dec 24 23:00:11 CET 2008
98	root	1.91	- fix a bug where an inotify watcher was added twice, causing
99	root	1.92	freezes on hash collisions (reported and analysed by Graham Leggett).
100	root	1.87	- new config symbol, EV_USE_CLOCK_SYSCALL, to make libev use
101			a direct syscall - slower, but no dependency on librt et al.
102	root	1.88	- assume negative return values != -1 signals success of port_getn
103			(http://cvs.epicsol.org/cgi/viewcvs.cgi/epic5/source/newio.c?rev=1.52)
104			(no known failure reports, but it doesn't hurt).
105	root	1.93	- fork detection in ev_embed now stops and restarts the watcher
106			automatically.
107	root	1.89	- EXPERIMENTAL: default the method to operator () in ev++.h,
108			to make it nicer to use functors (requested by Benedek László).
109			- fixed const object callbacks in ev++.h.
110	root	1.90	- replaced loop_ref argument of watcher.set (loop) by a direct
111			ev_loop * in ev++.h, to avoid clashes with functor patch.
112	root	1.91	- do not try to watch the empty string via inotify.
113	root	1.92	- inotify watchers could be leaked under certain circumstances.
114			- OS X 10.5 is actually even more broken than earlier versions,
115			so fall back to select on that piece of garbage.
116	root	1.93	- fixed some weirdness in the ev_embed documentation.
117	root	1.87
118	root	1.86	3.49 Wed Nov 19 11:26:53 CET 2008
119	root	1.83	- ev_stat watchers will now use inotify as a mere hint on
120			kernels <2.6.25, or if the filesystem is not in the
121			"known to be good" list.
122	root	1.84	- better mingw32 compatibility (it's not as borked as native win32)
123			(analysed by Roger Pack).
124	root	1.85	- include stdio.h in the example program, as too many people are
125			confused by the weird C language otherwise. I guess the next thing
126			I get told is that the "..." ellipses in the examples don't compile
127			with their C compiler.
128	root	1.83
129	root	1.80	3.48 Thu Oct 30 09:02:37 CET 2008
130	root	1.71	- further optimise away the EPOLL_CTL_ADD/MOD combo in the epoll
131			backend by assuming the kernel event mask hasn't changed if
132			ADD fails with EEXIST.
133	root	1.75	- work around spurious event notification bugs in epoll by using
134	root	1.77	a 32-bit generation counter. recreate kernel state if we receive
135	root	1.78	spurious notifications or unwanted events. this is very costly,
136			but I didn't come up with this horrible design.
137	root	1.71	- use memset to initialise most arrays now and do away with the
138			init functions.
139	root	1.72	- expand time-out strategies into a "Be smart about timeouts" section.
140			- drop the "struct" from all ev_watcher declarations in the
141	root	1.73	documentation and did other clarifications (yeah, it was a mistake
142			to have a struct AND a function called ev_loop).
143	root	1.74	- fix a bug where ev_default would not initialise the default
144			loop again after it was destroyed with ev_default_destroy.
145	root	1.79	- rename syserr to ev_syserr to avoid name clashes when embedding,
146			do similar changes for event.c.
147	root	1.71
148	root	1.69	3.45 Tue Oct 21 21:59:26 CEST 2008
149	root	1.67	- disable inotify usage on linux <2.6.25, as it is broken
150			(reported by Yoann Vandoorselaere).
151			- ev_stat errornously would try to add inotify watchers
152	root	1.68	even when inotify wasn't available (this should only
153	root	1.67	have a performance impact).
154	root	1.65	- ev_once now passes both timeout and io to the callback if both
155			occur concurrently, instead of giving timeouts precedence.
156	root	1.66	- disable EV_USE_INOTIFY when sys/inotify.h is too old.
157	root	1.65
158	root	1.62	3.44 Mon Sep 29 05:18:39 CEST 2008
159			- embed watchers now automatically invoke ev_loop_fork on the
160			embedded loop when the parent loop forks.
161	root	1.58	- new function: ev_now_update (loop).
162	root	1.57	- verify_watcher was not marked static.
163	root	1.59	- improve the "associating..." manpage section.
164	root	1.60	- documentation tweaks here and there.
165	root	1.57
166	root	1.56	3.43 Sun Jul 6 05:34:41 CEST 2008
167	root	1.54	- include more include files on windows to get struct _stati64
168	root	1.56	(reported by Chris Hulbert, but doesn't quite fix his issue).
169	root	1.53	- add missing #include <io.h> in ev.c on windows (reported by
170			Matt Tolton).
171
172	root	1.52	3.42 Tue Jun 17 12:12:07 CEST 2008
173	root	1.50	- work around yet another windows bug: FD_SET actually adds fd's
174			multiple times to the fd_SET, despite official MSN docs claiming
175	root	1.51	otherwise. Reported and well-analysed by Matt Tolton.
176			- define NFDBITS to 0 when EV_SELECT_IS_WINSOCKET to make it compile
177	root	1.48	(reported any analysed by Chris Hulbert).
178	root	1.49	- fix a bug in ev_ebadf (this function is only used to catch
179			programming errors in the libev user). reported by Matt Tolton.
180			- fix a bug in fd_intern on win32 (could lead to compile errors
181			under some circumstances, but would work correctly if it compiles).
182			reported by Matt Tolton.
183	root	1.50	- (try to) work around missing lstat on windows.
184	root	1.45	- pass in the write fd set as except fd set under windows. windows
185	root	1.46	is so uncontrollably lame that it requires this. this means that
186			switching off oobinline is not supported (but tcp/ip doesn't
187			have oob, so that would be stupid anyways.
188	root	1.47	- use posix module symbol to auto-detect monotonic clock presence
189			and some other default values.
190	root	1.45
191	root	1.44	3.41 Fri May 23 18:42:54 CEST 2008
192	root	1.46	- work around an obscure bug in winsocket select: if you
193	root	1.40	provide only empty fd sets then select returns WSAEINVAL. how sucky.
194	root	1.41	- improve timer scheduling stability and reduce use of time_epsilon.
195	root	1.36	- use 1-based 2-heap for EV_MINIMAL, simplifies code, reduces
196			codesize and makes for better cache-efficiency.
197			- use 3-based 4-heap for !EV_MINIMAL. this makes better use
198			of cpu cache lines and gives better growth behaviour than
199			2-based heaps.
200	root	1.38	- cache timestamp within heap for !EV_MINIMAL, to avoid random
201			memory accesses.
202			- document/add EV_USE_4HEAP and EV_HEAP_CACHE_AT.
203	root	1.33	- fix a potential aliasing issue in ev_timer_again.
204	root	1.35	- add/document ev_periodic_at, retract direct access to ->at.
205			- improve ev_stat docs.
206			- add portability requirements section.
207	root	1.39	- fix manpage headers etc.
208	root	1.40	- normalise WSA error codes to lower range on windows.
209	root	1.43	- add consistency check code that can be called automatically
210			or on demand to check for internal structures (ev_loop_verify).
211	root	1.31
212	root	1.30	3.31 Wed Apr 16 20:45:04 CEST 2008
213			- added last minute fix for ev_poll.c by Brandon Black.
214	root	1.29
215	root	1.28	3.3 Wed Apr 16 19:04:10 CEST 2008
216	root	1.23	- event_base_loopexit should return 0 on success
217			(W.C.A. Wijngaards).
218	root	1.20	- added linux eventfd support.
219			- try to autodetect epoll and inotify support
220			by libc header version if not using autoconf.
221	root	1.21	- new symbols: EV_DEFAULT_UC and EV_DEFAULT_UC_.
222			- declare functions defined in ev.h as inline if
223			C99 or gcc are available.
224			- enable inlining with gcc versions 2 and 3.
225	root	1.25	- work around broken poll implementations potentially
226			not clearing revents field in ev_poll (Brandon Black)
227			(no such systems are known at this time).
228	root	1.23	- work around a bug in realloc on openbsd and darwin,
229			also makes the errornous valgrind complaints
230			go away (noted by various people).
231	root	1.26	- fix ev_async_pending, add c++ wrapper for ev_async
232			(based on patch sent by Johannes Deisenhofer.
233			- add sensible set method to ev::embed.
234	root	1.27	- made integer constants type int in ev.h.
235	root	1.20
236	root	1.19	3.2 Wed Apr 2 17:11:19 CEST 2008
237	root	1.15	- fix a 64 bit overflow issue in the select backend,
238			by using fd_mask instead of int for the mask.
239	root	1.16	- rename internal sighandler to avoid clash with very old perls.
240	root	1.18	- entering ev_loop will not clear the ONESHOT or NONBLOCKING
241			flags of any outer loops anymore.
242	root	1.17	- add ev_async_pending.
243	root	1.15
244	root	1.14	3.1 Thu Mar 13 13:45:22 CET 2008
245	root	1.12	- implement ev_async watchers.
246	root	1.10	- only initialise signal pipe on demand.
247			- make use of sig_atomic_t configurable.
248	root	1.14	- improved documentation.
249	root	1.10
250	root	1.9	3.0 Mon Jan 28 13:14:47 CET 2008
251	root	1.6	- API/ABI bump to version 3.0.
252	root	1.4	- ev++.h includes "ev.h" by default now, not <ev.h>.
253			- slightly improved documentation.
254	root	1.5	- speed up signal detection after a fork.
255	root	1.6	- only optionally return trace status changed in ev_child
256			watchers.
257	root	1.8	- experimental (and undocumented) loop wrappers for ev++.h.
258	root	1.4
259	root	1.2	2.01 Tue Dec 25 08:04:41 CET 2007
260	root	1.3	- separate Changes file.
261	root	1.2	- fix ev_path_set => ev_stat_set typo.
262			- remove event_compat.h from the libev tarball.
263			- change how include files are found.
264			- doc updates.
265			- update licenses, explicitly allow for GPL relicensing.
266
267			2.0 Sat Dec 22 17:47:03 CET 2007
268			- new ev_sleep, ev_set_(io\|timeout)_collect_interval.
269			- removed epoll from embeddable fd set.
270			- fix embed watchers.
271			- renamed ev_embed.loop to other.
272			- added exported Symbol tables.
273			- undefine member wrapper macros at the end of ev.c.
274			- respect EV_H in ev++.h.
275
276			1.86 Tue Dec 18 02:36:57 CET 2007
277			- fix memleak on loop destroy (not relevant for perl).
278
279			1.85 Fri Dec 14 20:32:40 CET 2007
280			- fix some aliasing issues w.r.t. timers and periodics
281			(not relevant for perl).
282
283			(for historic versions refer to EV/Changes, found in the Perl interface)
284
285	root	1.1	0.1 Wed Oct 31 21:31:48 CET 2007
286			- original version; hacked together in <24h.
287