4.15 Fri Mar  1 12:04:50 CET 2013
 - destroying a non-default loop would stop the global waitpid
   watcher (Denis Bilenko).
 - queueing pending watchers of higher priority from a watcher now invokes
   them in a timely fashion (reported by Denis Bilenko).
 - add throw() to all libev functions that cannot throw exceptions, for
   further code size decrease when compiling for C++.
 - add throw () to callbacks that must not throw exceptions (allocator,
   syserr, loop acquire/release, periodic reschedule cbs).
 - fix event_base_loop return code, add event_get_callback, event_base_new,
   event_base_get_method calls to improve libevent 1.x emulation and add
   some libevent 2.x functionality (based on a patch by Jeff Davey).
 - add more memory fences to fix a bug reported by Jeff Davey. Better
   be overfenced than underprotected.
 - ev_run now returns a boolean status (true meaning watchers are
   still active).
 - ev_once: undef EV_ERROR in ev_kqueue.c, to avoid clashing with
   libev's EV_ERROR (reported by 191919).
 - (ecb) add memory fence support for xlC (Darin McBride).
 - (ecb) add memory fence support for gcc-mips (Anton Kirilov).
 - (ecb) add memory fence support for gcc-alpha (Christian Weisgerber).
 - work around some kernels losing file descriptors by leaking
   the kqueue descriptor in the child.
 - work around linux inotify not reporting IN_ATTRIB changes for directories
   in many cases.
 - include sys/syscall.h instead of plain syscall.h.
 - check for io watcher loops in ev_verify, check for the most
   common reported usage bug in ev_io_start.
 - chose socket vs. WSASocket at compiletime using EV_USE_WSASOCKET.
 - always use WSASend/WSARecv directly on windows, hoping that this
   works in all cases (unlike read/write/send/recv...).
 - try to detect signals around a fork faster (test program by
   Denis Bilenko).
 - work around recent glibc versions that leak memory in realloc.
 - rename ev::embed::set to ev::embed::set_embed to avoid clashing
   the watcher base set (loop) method.
 - rewrite the async/signal pipe logic to always keep a valid fd, which
   simplifies (and hopefuly correctifies :) the race checking
   on fork, at the cost of one extra fd.
 - add fat, msdos, jffs2, ramfs, ntfs and btrfs to the list of
   inotify-supporting filesystems.
 - move orig_CFLAGS assignment to after AC_INIT, as newer autoconf
   versions ignore it before
   (https://bugzilla.redhat.com/show_bug.cgi?id=908096).
 - add some untested android support.
 - enum expressions must be of type int (reported by Juan Pablo L).

4.11 Sat Feb  4 19:52:39 CET 2012
 - INCOMPATIBLE CHANGE: ev_timer_again now clears the pending status, as
   was documented already, but not implemented in the repeating case.
 - new compiletime symbols: EV_NO_SMP and EV_NO_THREADS.
 - fix a race where the workaround against the epoll fork bugs
   caused signals to not be handled anymore.
 - correct backend_fudge for most backends, and implement a windows
   specific workaround to avoid looping because we call both
   select and Sleep, both with different time resolutions.
 - document range and guarantees of ev_sleep.
 - document reasonable ranges for periodics interval and offset.
 - rename backend_fudge to backend_mintime to avoid future confusion :)
 - change the default periodic reschedule function to hopefully be more
   exact and correct even in corner cases or in the far future.
 - do not rely on -lm anymore: use it when available but use our
   own floor () if it is missing. This should make it easier to embed,
   as no external libraries are required.
 - strategically import macros from libecb and mark rarely-used functions
   as cache-cold (saving almost 2k code size on typical amd64 setups).
 - add Symbols.ev and Symbols.event files, that were missing.
 - fix backend_mintime value for epoll (was 1/1024, is 1/1000 now).
 - fix #3 "be smart about timeouts" to not "deadlock" when
   timeout == now, also improve the section overall.
 - avoid "AVOIDING FINISHING BEFORE RETURNING" idiom.
 - support new EV_API_STATIC mode to make all libev symbols
   static.
 - supply default CFLAGS of -g -O3 with gcc when original CFLAGS
   were empty.