[ViewVC] Annotation of: cvs/libev/Changes

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

TODO: accept() documentation
        - ev_embed_stop did not correctly stop the watcher (very good
          testcase by Vladimir Timofeev).
        - applied win32 fixes by Michael Lenaghan (also James Mansion).
        - remove dependency on sys/queue.h on freebsd (patch by Vanilla Hsu).
        - configure now prepends -O3, not appends it, so one can still
          override it.
        - disable poll backend on AIX, the poll header spams the namespace
          and it's not worth working around dead platforms (reported
          and analyzed by Aivars Kalvans).
        - improve header file compatibility of the standalone eventfd code
          in an obscure case.
        - implement EV_AVOID_STDIO option.
        - do not use sscanf to parse linux version number (smaller, faster,
          no sscanf dependency).
        - new EV_CHILD_ENABLE and EV_SIGNAL_ENABLE configurable settings.

3.9  Thu Dec 31 07:59:59 CET 2009
        - signalfd is no longer used by default and has to be requested
          explicitly - this means that easy to catch bugs become hard to
          catch race conditions, but the users have spoken.
        - point out the unspecified signal mask in the documentation, and
          that this is a race condition regardless of EV_SIGNALFD.
        - backport inotify code to C89.
        - inotify file descriptors could leak into child processes.
        - ev_stat watchers could keep an errornous extra ref on the loop,
          preventing exit when unregistering all watchers (testcases
          provided by ry@tinyclouds.org).
        - 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).
        - take advantage of inotify_init1, if available, to set cloexec/nonblock
          on fd creation, to avoid races.
        - the signal handling pipe wasn't always initialised under windows
          (analysed by lekma).
        - changed minimum glibc requirement from glibc 2.9 to 2.7, for
          signalfd.
        - add missing string.h include (Denis F. Latypoff).
        - only replace ev_stat.prev when we detect an actual difference,
          so prev is (almost) always different to attr. this might
          have caused the probems with 04_stat.t.
        - add ev::timer->remaining () method to C++ API.

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