[ViewVC] Annotation of: cvs/libev/Changes

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

TODO: include ev_xyz_start in each example?
        - "PORTING FROM LIBEV 3.X TO 4.X" (in ev.pod) is recommended reading.
        - ev_embed_stop did not correctly stop the watcher (very good
          testcase by Vladimir Timofeev).
        - ev_run will now always update the current loop time - it errornously
          didn't when idle watchers were active, causing timers not to fire.
        - fix a bug where a timeout of zero caused the timer not to fire
          in the libevent emulation (testcase by Péter Szabó).
        - applied win32 fixes by Michael Lenaghan (also James Mansion).
        - replace EV_MINIMAL by EV_FEATURES.
        - prefer EPOLL_CTL_ADD over EPOLL_CTL_MOD in some more cases, as it
          seems the former is *much* faster than the latter.
        - reduce the number of spurious wake-ups with the ports backend.
        - remove dependency on sys/queue.h on freebsd (patch by Vanilla Hsu).
        - do async init within ev_async_start, not ev_async_set, which avoids
          an API quirk where the set function must be called in the C++ API
          even when there is nothing to set.
        - add (undocumented) EV_ENABLE when adding events with kqueue,
          this might help with OS X, which seems to need it despite documenting
          not to need it (helpfully pointed out by Tilghman Lesher).
        - do not use poll by default on freebsd, it's broken (what isn't
          on freebsd...).
        - configure now prepends -O3, not appends it, so one can still
          override it.
        - ev.pod: greatly expanded the portability section, added a porting
          section, a description of watcher states and made lots of minor fixes.
        - 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.
        - update libev.m4 HAVE_CLOCK_SYSCALL test for newer glibcs.
        - add section on accept() problems to the manpage.
        - rename EV_TIMEOUT to EV_TIMER.
        - rename ev_loop_count/depth/verify/loop/unloop.
        - switch to two-digit minor version.
        - work around an apparent gentoo compiler bug.
        - define _DARWIN_UNLIMITED_SELECT. just so.
        - use enum instead of #define for most constants.
        - improve compatibility to older C++ compilers.

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:	1.190
Committed:	Thu Oct 21 16:07:37 2010 UTC (13 years, 6 months ago) by root
Branch:	MAIN
Changes since 1.189:	+3 -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	1.180	TODO: include ev_xyz_start in each example?
4	root	1.171	- "PORTING FROM LIBEV 3.X TO 4.X" (in ev.pod) is recommended reading.
5	root	1.161	- ev_embed_stop did not correctly stop the watcher (very good
6			testcase by Vladimir Timofeev).
7	root	1.187	- ev_run will now always update the current loop time - it errornously
8			didn't when idle watchers were active, causing timers not to fire.
9	root	1.179	- fix a bug where a timeout of zero caused the timer not to fire
10			in the libevent emulation (testcase by Péter Szabó).
11	root	1.164	- applied win32 fixes by Michael Lenaghan (also James Mansion).
12	root	1.166	- replace EV_MINIMAL by EV_FEATURES.
13	root	1.178	- prefer EPOLL_CTL_ADD over EPOLL_CTL_MOD in some more cases, as it
14			seems the former is much faster than the latter.
15	root	1.185	- reduce the number of spurious wake-ups with the ports backend.
16	root	1.158	- remove dependency on sys/queue.h on freebsd (patch by Vanilla Hsu).
17	root	1.186	- do async init within ev_async_start, not ev_async_set, which avoids
18			an API quirk where the set function must be called in the C++ API
19			even when there is nothing to set.
20	root	1.174	- add (undocumented) EV_ENABLE when adding events with kqueue,
21	root	1.175	this might help with OS X, which seems to need it despite documenting
22			not to need it (helpfully pointed out by Tilghman Lesher).
23	root	1.176	- do not use poll by default on freebsd, it's broken (what isn't
24			on freebsd...).
25	root	1.159	- configure now prepends -O3, not appends it, so one can still
26			override it.
27	root	1.190	- ev.pod: greatly expanded the portability section, added a porting
28			section, a description of watcher states and made lots of minor fixes.
29	root	1.160	- disable poll backend on AIX, the poll header spams the namespace
30			and it's not worth working around dead platforms (reported
31			and analyzed by Aivars Kalvans).
32	root	1.162	- improve header file compatibility of the standalone eventfd code
33			in an obscure case.
34	root	1.163	- implement EV_AVOID_STDIO option.
35			- do not use sscanf to parse linux version number (smaller, faster,
36			no sscanf dependency).
37	root	1.164	- new EV_CHILD_ENABLE and EV_SIGNAL_ENABLE configurable settings.
38	sf-exg	1.172	- update libev.m4 HAVE_CLOCK_SYSCALL test for newer glibcs.
39	root	1.165	- add section on accept() problems to the manpage.
40	root	1.168	- rename EV_TIMEOUT to EV_TIMER.
41	root	1.190	- rename ev_loop_count/depth/verify/loop/unloop.
42	root	1.168	- switch to two-digit minor version.
43	root	1.180	- work around an apparent gentoo compiler bug.
44	root	1.181	- define _DARWIN_UNLIMITED_SELECT. just so.
45	root	1.188	- use enum instead of #define for most constants.
46			- improve compatibility to older C++ compilers.
47	root	1.157
48	root	1.156	3.9 Thu Dec 31 07:59:59 CET 2009
49	root	1.155	- signalfd is no longer used by default and has to be requested
50			explicitly - this means that easy to catch bugs become hard to
51			catch race conditions, but the users have spoken.
52			- point out the unspecified signal mask in the documentation, and
53			that this is a race condition regardless of EV_SIGNALFD.
54	root	1.142	- backport inotify code to C89.
55	root	1.148	- inotify file descriptors could leak into child processes.
56	root	1.151	- ev_stat watchers could keep an errornous extra ref on the loop,
57			preventing exit when unregistering all watchers (testcases
58	root	1.150	provided by ry@tinyclouds.org).
59	root	1.143	- implement EV_WIN32_HANDLE_TO_FD and EV_WIN32_CLOSE_FD configuration
60	root	1.145	symbols to make it easier for apps to do their own fd management.
61	root	1.144	- support EV_IDLE_ENABLE being disabled in ev++.h
62			(patch by Didier Spezia).
63	root	1.147	- take advantage of inotify_init1, if available, to set cloexec/nonblock
64			on fd creation, to avoid races.
65	root	1.150	- the signal handling pipe wasn't always initialised under windows
66			(analysed by lekma).
67	root	1.146	- changed minimum glibc requirement from glibc 2.9 to 2.7, for
68			signalfd.
69	root	1.152	- add missing string.h include (Denis F. Latypoff).
70	root	1.153	- only replace ev_stat.prev when we detect an actual difference,
71			so prev is (almost) always different to attr. this might
72			have caused the probems with 04_stat.t.
73	root	1.154	- add ev::timer->remaining () method to C++ API.
74	root	1.142
75	root	1.141	3.8 Sun Aug 9 14:30:45 CEST 2009
76	root	1.133	- incompatible change: do not necessarily reset signal handler
77			to SIG_DFL when a sighandler is stopped.
78	root	1.135	- ev_default_destroy did not properly free or zero some members,
79	root	1.134	potentially causing crashes and memory corruption on repated
80			ev_default_destroy/ev_default_loop calls.
81	root	1.133	- take advantage of signalfd on GNU/Linux systems.
82			- document that the signal mask might be in an unspecified
83			state when using libev's signal handling.
84	root	1.136	- take advantage of some GNU/Linux calls to set cloexec/nonblock
85			on fd creation, to avoid race conditions.
86	root	1.132
87	root	1.131	3.7 Fri Jul 17 16:36:32 CEST 2009
88	root	1.128	- ev_unloop and ev_loop wrongly used a global variable to exit loops,
89			instead of using a per-loop variable (bug caught by accident...).
90			- the ev_set_io_collect_interval interpretation has changed.
91			- add new functionality: ev_set_userdata, ev_userdata,
92	root	1.126	ev_set_invoke_pending_cb, ev_set_loop_release_cb,
93	root	1.132	ev_invoke_pending, ev_pending_count, together with a long example
94			about thread locking.
95	root	1.128	- add ev_timer_remaining (as requested by Denis F. Latypoff).
96			- add ev_loop_depth.
97	root	1.124	- calling ev_unloop in fork/prepare watchers will no longer poll
98			for new events.
99	root	1.115	- Denis F. Latypoff corrected many typos in example code snippets.
100			- honor autoconf detection of EV_USE_CLOCK_SYSCALL, also double-
101			check that the syscall number is available before trying to
102			use it (reported by ry@tinyclouds).
103	root	1.117	- use GetSystemTimeAsFileTime instead of _timeb on windows, for
104	root	1.116	slightly higher accuracy.
105	root	1.122	- properly declare ev_loop_verify and ev_now_update even when
106			!EV_MULTIPLICITY.
107	root	1.121	- do not compile in any priority code when EV_MAXPRI == EV_MINPRI.
108	root	1.123	- support EV_MINIMAL==2 for a reduced API.
109	root	1.125	- actually 0-initialise struct sigaction when installing signals.
110	root	1.127	- add section on hibernate and stopped processes to ev_timer docs.
111	root	1.115
112	root	1.113	3.6 Tue Apr 28 02:49:30 CEST 2009
113	root	1.107	- multiple timers becoming ready within an event loop iteration
114			will be invoked in the "correct" order now.
115	root	1.105	- do not leave the event loop early just because we have no active
116			watchers, fixing a problem when embedding a kqueue loop
117			that has active kernel events but no registered watchers
118			(reported by blacksand blacksand).
119	root	1.102	- correctly zero the idx values for arrays, so destroying and
120			reinitialising the default loop actually works (patch by
121			Malek Hadj-Ali).
122	root	1.108	- implement ev_suspend and ev_resume.
123	root	1.106	- new EV_CUSTOM revents flag for use by applications.
124	root	1.109	- add documentation section about priorites.
125			- add a glossary to the dcoumentation.
126	root	1.111	- extend the ev_fork description slightly.
127	root	1.112	- optimize a jump out of call_pending.
128	root	1.102
129	root	1.101	3.53 Sun Feb 15 02:38:20 CET 2009
130			- fix a bug in event pipe creation on win32 that would cause a
131			failed assertion on event loop creation (patch by Malek Hadj-Ali).
132	root	1.100	- probe for CLOCK_REALTIME support at runtime as well and fall
133			back to gettimeofday if there is an error, to support older
134			operating systems with newer header files/libraries.
135			- prefer gettimeofday over clock_gettime with USE_CLOCK_SYSCALL
136			(default most everywhere), otherwise not.
137
138	root	1.99	3.52 Wed Jan 7 21:43:02 CET 2009
139	root	1.97	- fix compilation of select backend in fd_set mode when NFDBITS is
140			missing (to get it to compile on QNX, reported by Rodrigo Campos).
141			- better select-nfds handling when select backend is in fd_set mode.
142			- diagnose fd_set overruns when select backend is in fd_set mode.
143			- due to a thinko, instead of disabling everything but
144			select on the borked OS X platform, everything but select was
145			allowed (reported by Emanuele Giaquinta).
146	root	1.95	- actually verify that local and remote port are matching in
147			libev's socketpair emulation, which makes denial-of-service
148			attacks harder (but not impossible - it's windows). Make sure
149	root	1.96	it even works under vista, which thinks that getpeer/sockname
150			should return fantasy port numbers.
151	root	1.100	- include "libev" in all assertion messages for potentially
152	root	1.97	clearer diagnostics.
153	root	1.98	- event_get_version (libevent compatibility) returned
154			a useless string instead of the expected version string
155			(patch by W.C.A. Wijngaards).
156	root	1.95
157	root	1.94	3.51 Wed Dec 24 23:00:11 CET 2008
158	root	1.91	- fix a bug where an inotify watcher was added twice, causing
159	root	1.92	freezes on hash collisions (reported and analysed by Graham Leggett).
160	root	1.87	- new config symbol, EV_USE_CLOCK_SYSCALL, to make libev use
161			a direct syscall - slower, but no dependency on librt et al.
162	root	1.88	- assume negative return values != -1 signals success of port_getn
163			(http://cvs.epicsol.org/cgi/viewcvs.cgi/epic5/source/newio.c?rev=1.52)
164			(no known failure reports, but it doesn't hurt).
165	root	1.93	- fork detection in ev_embed now stops and restarts the watcher
166			automatically.
167	root	1.89	- EXPERIMENTAL: default the method to operator () in ev++.h,
168			to make it nicer to use functors (requested by Benedek László).
169			- fixed const object callbacks in ev++.h.
170	root	1.90	- replaced loop_ref argument of watcher.set (loop) by a direct
171			ev_loop * in ev++.h, to avoid clashes with functor patch.
172	root	1.91	- do not try to watch the empty string via inotify.
173	root	1.92	- inotify watchers could be leaked under certain circumstances.
174			- OS X 10.5 is actually even more broken than earlier versions,
175			so fall back to select on that piece of garbage.
176	root	1.93	- fixed some weirdness in the ev_embed documentation.
177	root	1.87
178	root	1.86	3.49 Wed Nov 19 11:26:53 CET 2008
179	root	1.83	- ev_stat watchers will now use inotify as a mere hint on
180			kernels <2.6.25, or if the filesystem is not in the
181			"known to be good" list.
182	root	1.84	- better mingw32 compatibility (it's not as borked as native win32)
183			(analysed by Roger Pack).
184	root	1.85	- include stdio.h in the example program, as too many people are
185			confused by the weird C language otherwise. I guess the next thing
186			I get told is that the "..." ellipses in the examples don't compile
187			with their C compiler.
188	root	1.83
189	root	1.80	3.48 Thu Oct 30 09:02:37 CET 2008
190	root	1.71	- further optimise away the EPOLL_CTL_ADD/MOD combo in the epoll
191			backend by assuming the kernel event mask hasn't changed if
192			ADD fails with EEXIST.
193	root	1.75	- work around spurious event notification bugs in epoll by using
194	root	1.77	a 32-bit generation counter. recreate kernel state if we receive
195	root	1.78	spurious notifications or unwanted events. this is very costly,
196			but I didn't come up with this horrible design.
197	root	1.71	- use memset to initialise most arrays now and do away with the
198			init functions.
199	root	1.72	- expand time-out strategies into a "Be smart about timeouts" section.
200			- drop the "struct" from all ev_watcher declarations in the
201	root	1.73	documentation and did other clarifications (yeah, it was a mistake
202			to have a struct AND a function called ev_loop).
203	root	1.74	- fix a bug where ev_default would not initialise the default
204			loop again after it was destroyed with ev_default_destroy.
205	root	1.79	- rename syserr to ev_syserr to avoid name clashes when embedding,
206			do similar changes for event.c.
207	root	1.71
208	root	1.69	3.45 Tue Oct 21 21:59:26 CEST 2008
209	root	1.67	- disable inotify usage on linux <2.6.25, as it is broken
210			(reported by Yoann Vandoorselaere).
211			- ev_stat errornously would try to add inotify watchers
212	root	1.68	even when inotify wasn't available (this should only
213	root	1.67	have a performance impact).
214	root	1.65	- ev_once now passes both timeout and io to the callback if both
215			occur concurrently, instead of giving timeouts precedence.
216	root	1.66	- disable EV_USE_INOTIFY when sys/inotify.h is too old.
217	root	1.65
218	root	1.62	3.44 Mon Sep 29 05:18:39 CEST 2008
219			- embed watchers now automatically invoke ev_loop_fork on the
220			embedded loop when the parent loop forks.
221	root	1.58	- new function: ev_now_update (loop).
222	root	1.57	- verify_watcher was not marked static.
223	root	1.59	- improve the "associating..." manpage section.
224	root	1.60	- documentation tweaks here and there.
225	root	1.57
226	root	1.56	3.43 Sun Jul 6 05:34:41 CEST 2008
227	root	1.54	- include more include files on windows to get struct _stati64
228	root	1.56	(reported by Chris Hulbert, but doesn't quite fix his issue).
229	root	1.53	- add missing #include <io.h> in ev.c on windows (reported by
230			Matt Tolton).
231
232	root	1.52	3.42 Tue Jun 17 12:12:07 CEST 2008
233	root	1.50	- work around yet another windows bug: FD_SET actually adds fd's
234			multiple times to the fd_SET, despite official MSN docs claiming
235	root	1.51	otherwise. Reported and well-analysed by Matt Tolton.
236			- define NFDBITS to 0 when EV_SELECT_IS_WINSOCKET to make it compile
237	root	1.48	(reported any analysed by Chris Hulbert).
238	root	1.49	- fix a bug in ev_ebadf (this function is only used to catch
239			programming errors in the libev user). reported by Matt Tolton.
240			- fix a bug in fd_intern on win32 (could lead to compile errors
241			under some circumstances, but would work correctly if it compiles).
242			reported by Matt Tolton.
243	root	1.50	- (try to) work around missing lstat on windows.
244	root	1.45	- pass in the write fd set as except fd set under windows. windows
245	root	1.46	is so uncontrollably lame that it requires this. this means that
246			switching off oobinline is not supported (but tcp/ip doesn't
247			have oob, so that would be stupid anyways.
248	root	1.47	- use posix module symbol to auto-detect monotonic clock presence
249			and some other default values.
250	root	1.45
251	root	1.44	3.41 Fri May 23 18:42:54 CEST 2008
252	root	1.46	- work around an obscure bug in winsocket select: if you
253	root	1.40	provide only empty fd sets then select returns WSAEINVAL. how sucky.
254	root	1.41	- improve timer scheduling stability and reduce use of time_epsilon.
255	root	1.36	- use 1-based 2-heap for EV_MINIMAL, simplifies code, reduces
256			codesize and makes for better cache-efficiency.
257			- use 3-based 4-heap for !EV_MINIMAL. this makes better use
258			of cpu cache lines and gives better growth behaviour than
259			2-based heaps.
260	root	1.38	- cache timestamp within heap for !EV_MINIMAL, to avoid random
261			memory accesses.
262			- document/add EV_USE_4HEAP and EV_HEAP_CACHE_AT.
263	root	1.33	- fix a potential aliasing issue in ev_timer_again.
264	root	1.35	- add/document ev_periodic_at, retract direct access to ->at.
265			- improve ev_stat docs.
266			- add portability requirements section.
267	root	1.39	- fix manpage headers etc.
268	root	1.40	- normalise WSA error codes to lower range on windows.
269	root	1.43	- add consistency check code that can be called automatically
270			or on demand to check for internal structures (ev_loop_verify).
271	root	1.31
272	root	1.30	3.31 Wed Apr 16 20:45:04 CEST 2008
273			- added last minute fix for ev_poll.c by Brandon Black.
274	root	1.29
275	root	1.28	3.3 Wed Apr 16 19:04:10 CEST 2008
276	root	1.23	- event_base_loopexit should return 0 on success
277			(W.C.A. Wijngaards).
278	root	1.20	- added linux eventfd support.
279			- try to autodetect epoll and inotify support
280			by libc header version if not using autoconf.
281	root	1.21	- new symbols: EV_DEFAULT_UC and EV_DEFAULT_UC_.
282			- declare functions defined in ev.h as inline if
283			C99 or gcc are available.
284			- enable inlining with gcc versions 2 and 3.
285	root	1.25	- work around broken poll implementations potentially
286			not clearing revents field in ev_poll (Brandon Black)
287			(no such systems are known at this time).
288	root	1.23	- work around a bug in realloc on openbsd and darwin,
289			also makes the errornous valgrind complaints
290			go away (noted by various people).
291	root	1.26	- fix ev_async_pending, add c++ wrapper for ev_async
292			(based on patch sent by Johannes Deisenhofer.
293			- add sensible set method to ev::embed.
294	root	1.27	- made integer constants type int in ev.h.
295	root	1.20
296	root	1.19	3.2 Wed Apr 2 17:11:19 CEST 2008
297	root	1.15	- fix a 64 bit overflow issue in the select backend,
298			by using fd_mask instead of int for the mask.
299	root	1.16	- rename internal sighandler to avoid clash with very old perls.
300	root	1.18	- entering ev_loop will not clear the ONESHOT or NONBLOCKING
301			flags of any outer loops anymore.
302	root	1.17	- add ev_async_pending.
303	root	1.15
304	root	1.14	3.1 Thu Mar 13 13:45:22 CET 2008
305	root	1.12	- implement ev_async watchers.
306	root	1.10	- only initialise signal pipe on demand.
307			- make use of sig_atomic_t configurable.
308	root	1.14	- improved documentation.
309	root	1.10
310	root	1.9	3.0 Mon Jan 28 13:14:47 CET 2008
311	root	1.6	- API/ABI bump to version 3.0.
312	root	1.4	- ev++.h includes "ev.h" by default now, not <ev.h>.
313			- slightly improved documentation.
314	root	1.5	- speed up signal detection after a fork.
315	root	1.6	- only optionally return trace status changed in ev_child
316			watchers.
317	root	1.8	- experimental (and undocumented) loop wrappers for ev++.h.
318	root	1.4
319	root	1.2	2.01 Tue Dec 25 08:04:41 CET 2007
320	root	1.3	- separate Changes file.
321	root	1.2	- fix ev_path_set => ev_stat_set typo.
322			- remove event_compat.h from the libev tarball.
323			- change how include files are found.
324			- doc updates.
325			- update licenses, explicitly allow for GPL relicensing.
326
327			2.0 Sat Dec 22 17:47:03 CET 2007
328			- new ev_sleep, ev_set_(io\|timeout)_collect_interval.
329			- removed epoll from embeddable fd set.
330			- fix embed watchers.
331			- renamed ev_embed.loop to other.
332			- added exported Symbol tables.
333			- undefine member wrapper macros at the end of ev.c.
334			- respect EV_H in ev++.h.
335
336			1.86 Tue Dec 18 02:36:57 CET 2007
337			- fix memleak on loop destroy (not relevant for perl).
338
339			1.85 Fri Dec 14 20:32:40 CET 2007
340			- fix some aliasing issues w.r.t. timers and periodics
341			(not relevant for perl).
342
343			(for historic versions refer to EV/Changes, found in the Perl interface)
344
345	root	1.1	0.1 Wed Oct 31 21:31:48 CET 2007
346			- original version; hacked together in <24h.
347