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477 lines
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477 lines
25 KiB
Revision history for libev, a high-performance and full-featured event loop.
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TODO: ev_loop_wakeup
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TODO: EV_STANDALONE == NO_HASSEL (do not use clock_gettime in ev_standalone)
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TODO: faq, process a thing in each iteration
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TODO: dbeugging tips, ev_verify, ev_init twice
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TODO: ev_break for immediate exit (EVBREAK_NOW?)
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TODO: ev_feed_child_event
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TODO: document the special problem of signals around fork.
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TODO: store pid for each signal
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TODO: document file descriptor usage per loop
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TODO: store loop pid_t and compare isndie signal handler,store 1 for same, 2 for differign pid, clean up in loop_fork
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TODO: embed watchers need updating when fd changes
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TODO: document portbaility requirements for atomic pointer access
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4.15 Fri Mar 1 12:04:50 CET 2013
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- destroying a non-default loop would stop the global waitpid
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watcher (Denis Bilenko).
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- queueing pending watchers of higher priority from a watcher now invokes
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them in a timely fashion (reported by Denis Bilenko).
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- add throw() to all libev functions that cannot throw exceptions, for
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further code size decrease when compiling for C++.
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- add throw () to callbacks that must not throw exceptions (allocator,
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syserr, loop acquire/release, periodic reschedule cbs).
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- fix event_base_loop return code, add event_get_callback, event_base_new,
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event_base_get_method calls to improve libevent 1.x emulation and add
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some libevent 2.x functionality (based on a patch by Jeff Davey).
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- add more memory fences to fix a bug reported by Jeff Davey. Better
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be overfenced than underprotected.
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- ev_run now returns a boolean status (true meaning watchers are
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still active).
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- ev_once: undef EV_ERROR in ev_kqueue.c, to avoid clashing with
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libev's EV_ERROR (reported by 191919).
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- (ecb) add memory fence support for xlC (Darin McBride).
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- (ecb) add memory fence support for gcc-mips (Anton Kirilov).
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- (ecb) add memory fence support for gcc-alpha (Christian Weisgerber).
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- work around some kernels losing file descriptors by leaking
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the kqueue descriptor in the child.
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- work around linux inotify not reporting IN_ATTRIB changes for directories
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in many cases.
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- include sys/syscall.h instead of plain syscall.h.
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- check for io watcher loops in ev_verify, check for the most
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common reported usage bug in ev_io_start.
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- chose socket vs. WSASocket at compiletime using EV_USE_WSASOCKET.
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- always use WSASend/WSARecv directly on windows, hoping that this
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works in all cases (unlike read/write/send/recv...).
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- try to detect signals around a fork faster (test program by
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Denis Bilenko).
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- work around recent glibc versions that leak memory in realloc.
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- rename ev::embed::set to ev::embed::set_embed to avoid clashing
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the watcher base set (loop) method.
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- rewrite the async/signal pipe logic to always keep a valid fd, which
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simplifies (and hopefuly correctifies :) the race checking
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on fork, at the cost of one extra fd.
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- add fat, msdos, jffs2, ramfs, ntfs and btrfs to the list of
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inotify-supporting filesystems.
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- move orig_CFLAGS assignment to after AC_INIT, as newer autoconf
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versions ignore it before
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(https://bugzilla.redhat.com/show_bug.cgi?id=908096).
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- add some untested android support.
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- enum expressions must be of type int (reported by Juan Pablo L).
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4.11 Sat Feb 4 19:52:39 CET 2012
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- INCOMPATIBLE CHANGE: ev_timer_again now clears the pending status, as
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was documented already, but not implemented in the repeating case.
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- new compiletime symbols: EV_NO_SMP and EV_NO_THREADS.
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- fix a race where the workaround against the epoll fork bugs
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caused signals to not be handled anymore.
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- correct backend_fudge for most backends, and implement a windows
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specific workaround to avoid looping because we call both
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select and Sleep, both with different time resolutions.
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- document range and guarantees of ev_sleep.
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- document reasonable ranges for periodics interval and offset.
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- rename backend_fudge to backend_mintime to avoid future confusion :)
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- change the default periodic reschedule function to hopefully be more
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exact and correct even in corner cases or in the far future.
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- do not rely on -lm anymore: use it when available but use our
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own floor () if it is missing. This should make it easier to embed,
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as no external libraries are required.
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- strategically import macros from libecb and mark rarely-used functions
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as cache-cold (saving almost 2k code size on typical amd64 setups).
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- add Symbols.ev and Symbols.event files, that were missing.
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- fix backend_mintime value for epoll (was 1/1024, is 1/1000 now).
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- fix #3 "be smart about timeouts" to not "deadlock" when
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timeout == now, also improve the section overall.
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- avoid "AVOIDING FINISHING BEFORE RETURNING" idiom.
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- support new EV_API_STATIC mode to make all libev symbols
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static.
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- supply default CFLAGS of -g -O3 with gcc when original CFLAGS
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were empty.
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4.04 Wed Feb 16 09:01:51 CET 2011
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- fix two problems in the native win32 backend, where reuse of fd's
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with different underlying handles caused handles not to be removed
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or added to the select set (analyzed and tested by Bert Belder).
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- do no rely on ceil() in ev_e?poll.c.
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- backport libev to HP-UX versions before 11 v3.
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- configure did not detect nanosleep and clock_gettime properly when
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they are available in the libc (as opposed to -lrt).
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4.03 Tue Jan 11 14:37:25 CET 2011
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- officially support polling files with all backends.
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- support files, /dev/zero etc. the same way as select in the epoll
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backend, by generating events on our own.
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- ports backend: work around solaris bug 6874410 and many related ones
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(EINTR, maybe more), with no performance loss (note that the solaris
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bug report is actually wrong, reality is far more bizarre and broken
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than that).
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- define EV_READ/EV_WRITE as macros in event.h, as some programs use
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#ifdef to test for them.
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- new (experimental) function: ev_feed_signal.
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- new (to become default) EVFLAG_NOSIGMASK flag.
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- new EVBACKEND_MASK symbol.
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- updated COMMON IDIOMS SECTION.
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4.01 Fri Nov 5 21:51:29 CET 2010
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- automake fucked it up, apparently, --add-missing -f is not quite enough
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to make it update its files, so 4.00 didn't install ev++.h and
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event.h on make install. grrr.
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- ev_loop(count|depth) didn't return anything (Robin Haberkorn).
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- change EV_UNDEF to 0xffffffff to silence some overzealous compilers.
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- use "(libev) " prefix for all libev error messages now.
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4.00 Mon Oct 25 12:32:12 CEST 2010
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- "PORTING FROM LIBEV 3.X TO 4.X" (in ev.pod) is recommended reading.
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- ev_embed_stop did not correctly stop the watcher (very good
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testcase by Vladimir Timofeev).
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- ev_run will now always update the current loop time - it erroneously
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didn't when idle watchers were active, causing timers not to fire.
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- fix a bug where a timeout of zero caused the timer not to fire
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in the libevent emulation (testcase by Péter Szabó).
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- applied win32 fixes by Michael Lenaghan (also James Mansion).
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- replace EV_MINIMAL by EV_FEATURES.
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- prefer EPOLL_CTL_ADD over EPOLL_CTL_MOD in some more cases, as it
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seems the former is *much* faster than the latter.
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- linux kernel version detection (for inotify bug workarounds)
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did not work properly.
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- reduce the number of spurious wake-ups with the ports backend.
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- remove dependency on sys/queue.h on freebsd (patch by Vanilla Hsu).
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- do async init within ev_async_start, not ev_async_set, which avoids
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an API quirk where the set function must be called in the C++ API
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even when there is nothing to set.
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- add (undocumented) EV_ENABLE when adding events with kqueue,
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this might help with OS X, which seems to need it despite documenting
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not to need it (helpfully pointed out by Tilghman Lesher).
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- do not use poll by default on freebsd, it's broken (what isn't
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on freebsd...).
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- allow to embed epoll on kernels >= 2.6.32.
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- configure now prepends -O3, not appends it, so one can still
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override it.
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- ev.pod: greatly expanded the portability section, added a porting
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section, a description of watcher states and made lots of minor fixes.
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- disable poll backend on AIX, the poll header spams the namespace
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and it's not worth working around dead platforms (reported
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and analyzed by Aivars Kalvans).
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- improve header file compatibility of the standalone eventfd code
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in an obscure case.
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- implement EV_AVOID_STDIO option.
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- do not use sscanf to parse linux version number (smaller, faster,
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no sscanf dependency).
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- new EV_CHILD_ENABLE and EV_SIGNAL_ENABLE configurable settings.
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- update libev.m4 HAVE_CLOCK_SYSCALL test for newer glibcs.
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- add section on accept() problems to the manpage.
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- rename EV_TIMEOUT to EV_TIMER.
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- rename ev_loop_count/depth/verify/loop/unloop.
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- remove ev_default_destroy and ev_default_fork.
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- switch to two-digit minor version.
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- work around an apparent gentoo compiler bug.
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- define _DARWIN_UNLIMITED_SELECT. just so.
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- use enum instead of #define for most constants.
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- improve compatibility to older C++ compilers.
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- (experimental) ev_run/ev_default_loop/ev_break/ev_loop_new have now
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default arguments when compiled as C++.
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- enable automake dependency tracking.
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- ev_loop_new no longer leaks memory when loop creation failed.
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- new ev_cleanup watcher type.
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3.9 Thu Dec 31 07:59:59 CET 2009
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- signalfd is no longer used by default and has to be requested
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explicitly - this means that easy to catch bugs become hard to
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catch race conditions, but the users have spoken.
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- point out the unspecified signal mask in the documentation, and
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that this is a race condition regardless of EV_SIGNALFD.
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- backport inotify code to C89.
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- inotify file descriptors could leak into child processes.
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- ev_stat watchers could keep an erroneous extra ref on the loop,
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preventing exit when unregistering all watchers (testcases
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provided by ry@tinyclouds.org).
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- implement EV_WIN32_HANDLE_TO_FD and EV_WIN32_CLOSE_FD configuration
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symbols to make it easier for apps to do their own fd management.
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- support EV_IDLE_ENABLE being disabled in ev++.h
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(patch by Didier Spezia).
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- take advantage of inotify_init1, if available, to set cloexec/nonblock
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on fd creation, to avoid races.
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- the signal handling pipe wasn't always initialised under windows
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(analysed by lekma).
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- changed minimum glibc requirement from glibc 2.9 to 2.7, for
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signalfd.
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- add missing string.h include (Denis F. Latypoff).
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- only replace ev_stat.prev when we detect an actual difference,
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so prev is (almost) always different to attr. this might
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have caused the problems with 04_stat.t.
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- add ev::timer->remaining () method to C++ API.
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3.8 Sun Aug 9 14:30:45 CEST 2009
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- incompatible change: do not necessarily reset signal handler
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to SIG_DFL when a sighandler is stopped.
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- ev_default_destroy did not properly free or zero some members,
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potentially causing crashes and memory corruption on repeated
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ev_default_destroy/ev_default_loop calls.
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- take advantage of signalfd on GNU/Linux systems.
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- document that the signal mask might be in an unspecified
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state when using libev's signal handling.
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- take advantage of some GNU/Linux calls to set cloexec/nonblock
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on fd creation, to avoid race conditions.
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3.7 Fri Jul 17 16:36:32 CEST 2009
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- ev_unloop and ev_loop wrongly used a global variable to exit loops,
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instead of using a per-loop variable (bug caught by accident...).
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- the ev_set_io_collect_interval interpretation has changed.
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- add new functionality: ev_set_userdata, ev_userdata,
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ev_set_invoke_pending_cb, ev_set_loop_release_cb,
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ev_invoke_pending, ev_pending_count, together with a long example
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about thread locking.
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- add ev_timer_remaining (as requested by Denis F. Latypoff).
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- add ev_loop_depth.
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- calling ev_unloop in fork/prepare watchers will no longer poll
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for new events.
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- Denis F. Latypoff corrected many typos in example code snippets.
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- honor autoconf detection of EV_USE_CLOCK_SYSCALL, also double-
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check that the syscall number is available before trying to
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use it (reported by ry@tinyclouds).
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- use GetSystemTimeAsFileTime instead of _timeb on windows, for
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slightly higher accuracy.
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- properly declare ev_loop_verify and ev_now_update even when
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!EV_MULTIPLICITY.
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- do not compile in any priority code when EV_MAXPRI == EV_MINPRI.
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- support EV_MINIMAL==2 for a reduced API.
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- actually 0-initialise struct sigaction when installing signals.
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- add section on hibernate and stopped processes to ev_timer docs.
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3.6 Tue Apr 28 02:49:30 CEST 2009
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- multiple timers becoming ready within an event loop iteration
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will be invoked in the "correct" order now.
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- do not leave the event loop early just because we have no active
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watchers, fixing a problem when embedding a kqueue loop
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that has active kernel events but no registered watchers
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(reported by blacksand blacksand).
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- correctly zero the idx values for arrays, so destroying and
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reinitialising the default loop actually works (patch by
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Malek Hadj-Ali).
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- implement ev_suspend and ev_resume.
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- new EV_CUSTOM revents flag for use by applications.
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- add documentation section about priorities.
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- add a glossary to the dcoumentation.
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- extend the ev_fork description slightly.
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- optimize a jump out of call_pending.
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3.53 Sun Feb 15 02:38:20 CET 2009
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- fix a bug in event pipe creation on win32 that would cause a
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failed assertion on event loop creation (patch by Malek Hadj-Ali).
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- probe for CLOCK_REALTIME support at runtime as well and fall
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back to gettimeofday if there is an error, to support older
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operating systems with newer header files/libraries.
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- prefer gettimeofday over clock_gettime with USE_CLOCK_SYSCALL
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(default most everywhere), otherwise not.
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3.52 Wed Jan 7 21:43:02 CET 2009
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- fix compilation of select backend in fd_set mode when NFDBITS is
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missing (to get it to compile on QNX, reported by Rodrigo Campos).
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- better select-nfds handling when select backend is in fd_set mode.
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- diagnose fd_set overruns when select backend is in fd_set mode.
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- due to a thinko, instead of disabling everything but
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select on the borked OS X platform, everything but select was
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allowed (reported by Emanuele Giaquinta).
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- actually verify that local and remote port are matching in
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libev's socketpair emulation, which makes denial-of-service
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attacks harder (but not impossible - it's windows). Make sure
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it even works under vista, which thinks that getpeer/sockname
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should return fantasy port numbers.
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- include "libev" in all assertion messages for potentially
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clearer diagnostics.
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- event_get_version (libevent compatibility) returned
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a useless string instead of the expected version string
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(patch by W.C.A. Wijngaards).
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3.51 Wed Dec 24 23:00:11 CET 2008
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- fix a bug where an inotify watcher was added twice, causing
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freezes on hash collisions (reported and analysed by Graham Leggett).
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- new config symbol, EV_USE_CLOCK_SYSCALL, to make libev use
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a direct syscall - slower, but no dependency on librt et al.
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- assume negative return values != -1 signals success of port_getn
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(http://cvs.epicsol.org/cgi/viewcvs.cgi/epic5/source/newio.c?rev=1.52)
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(no known failure reports, but it doesn't hurt).
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- fork detection in ev_embed now stops and restarts the watcher
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automatically.
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- EXPERIMENTAL: default the method to operator () in ev++.h,
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to make it nicer to use functors (requested by Benedek László).
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- fixed const object callbacks in ev++.h.
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- replaced loop_ref argument of watcher.set (loop) by a direct
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ev_loop * in ev++.h, to avoid clashes with functor patch.
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- do not try to watch the empty string via inotify.
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- inotify watchers could be leaked under certain circumstances.
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- OS X 10.5 is actually even more broken than earlier versions,
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so fall back to select on that piece of garbage.
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- fixed some weirdness in the ev_embed documentation.
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3.49 Wed Nov 19 11:26:53 CET 2008
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- ev_stat watchers will now use inotify as a mere hint on
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kernels <2.6.25, or if the filesystem is not in the
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"known to be good" list.
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- better mingw32 compatibility (it's not as borked as native win32)
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(analysed by Roger Pack).
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- include stdio.h in the example program, as too many people are
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confused by the weird C language otherwise. I guess the next thing
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I get told is that the "..." ellipses in the examples don't compile
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with their C compiler.
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3.48 Thu Oct 30 09:02:37 CET 2008
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- further optimise away the EPOLL_CTL_ADD/MOD combo in the epoll
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backend by assuming the kernel event mask hasn't changed if
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ADD fails with EEXIST.
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- work around spurious event notification bugs in epoll by using
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a 32-bit generation counter. recreate kernel state if we receive
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spurious notifications or unwanted events. this is very costly,
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but I didn't come up with this horrible design.
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- use memset to initialise most arrays now and do away with the
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init functions.
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- expand time-out strategies into a "Be smart about timeouts" section.
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- drop the "struct" from all ev_watcher declarations in the
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documentation and did other clarifications (yeah, it was a mistake
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to have a struct AND a function called ev_loop).
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- fix a bug where ev_default would not initialise the default
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loop again after it was destroyed with ev_default_destroy.
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- rename syserr to ev_syserr to avoid name clashes when embedding,
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do similar changes for event.c.
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3.45 Tue Oct 21 21:59:26 CEST 2008
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- disable inotify usage on linux <2.6.25, as it is broken
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(reported by Yoann Vandoorselaere).
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- ev_stat erroneously would try to add inotify watchers
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even when inotify wasn't available (this should only
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have a performance impact).
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- ev_once now passes both timeout and io to the callback if both
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occur concurrently, instead of giving timeouts precedence.
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- disable EV_USE_INOTIFY when sys/inotify.h is too old.
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3.44 Mon Sep 29 05:18:39 CEST 2008
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- embed watchers now automatically invoke ev_loop_fork on the
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embedded loop when the parent loop forks.
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- new function: ev_now_update (loop).
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- verify_watcher was not marked static.
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- improve the "associating..." manpage section.
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- documentation tweaks here and there.
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3.43 Sun Jul 6 05:34:41 CEST 2008
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- include more include files on windows to get struct _stati64
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(reported by Chris Hulbert, but doesn't quite fix his issue).
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- add missing #include <io.h> in ev.c on windows (reported by
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Matt Tolton).
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3.42 Tue Jun 17 12:12:07 CEST 2008
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- work around yet another windows bug: FD_SET actually adds fd's
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multiple times to the fd_*SET*, despite official MSN docs claiming
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otherwise. Reported and well-analysed by Matt Tolton.
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- define NFDBITS to 0 when EV_SELECT_IS_WINSOCKET to make it compile
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(reported any analysed by Chris Hulbert).
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- fix a bug in ev_ebadf (this function is only used to catch
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programming errors in the libev user). reported by Matt Tolton.
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- fix a bug in fd_intern on win32 (could lead to compile errors
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under some circumstances, but would work correctly if it compiles).
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reported by Matt Tolton.
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- (try to) work around missing lstat on windows.
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- pass in the write fd set as except fd set under windows. windows
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is so uncontrollably lame that it requires this. this means that
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switching off oobinline is not supported (but tcp/ip doesn't
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have oob, so that would be stupid anyways.
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- use posix module symbol to auto-detect monotonic clock presence
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and some other default values.
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3.41 Fri May 23 18:42:54 CEST 2008
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- work around an obscure bug in winsocket select: if you
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provide only empty fd sets then select returns WSAEINVAL. how sucky.
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- improve timer scheduling stability and reduce use of time_epsilon.
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- use 1-based 2-heap for EV_MINIMAL, simplifies code, reduces
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codesize and makes for better cache-efficiency.
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- use 3-based 4-heap for !EV_MINIMAL. this makes better use
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of cpu cache lines and gives better growth behaviour than
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2-based heaps.
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- cache timestamp within heap for !EV_MINIMAL, to avoid random
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memory accesses.
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- document/add EV_USE_4HEAP and EV_HEAP_CACHE_AT.
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- fix a potential aliasing issue in ev_timer_again.
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- add/document ev_periodic_at, retract direct access to ->at.
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- improve ev_stat docs.
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- add portability requirements section.
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- fix manpage headers etc.
|
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- normalise WSA error codes to lower range on windows.
|
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- add consistency check code that can be called automatically
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or on demand to check for internal structures (ev_loop_verify).
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3.31 Wed Apr 16 20:45:04 CEST 2008
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- added last minute fix for ev_poll.c by Brandon Black.
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|
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3.3 Wed Apr 16 19:04:10 CEST 2008
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- event_base_loopexit should return 0 on success
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(W.C.A. Wijngaards).
|
|
- added linux eventfd support.
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|
- try to autodetect epoll and inotify support
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|
by libc header version if not using autoconf.
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- new symbols: EV_DEFAULT_UC and EV_DEFAULT_UC_.
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- 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)
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|
(no such systems are known at this time).
|
|
- work around a bug in realloc on openbsd and darwin,
|
|
also makes the erroneous 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.
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|
|
|
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.
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|
|
|
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.
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|
|
|
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).
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|
|
|
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.
|
|
|