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Revision history for libev, a high-performance and full-featured event loop. |
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|
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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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|
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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 funcitonality (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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- 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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|
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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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|
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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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|
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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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|
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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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|
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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). |
130 |
- 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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|
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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 |
162 |
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). |
167 |
- take advantage of inotify_init1, if available, to set cloexec/nonblock |
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on fd creation, to avoid races. |
169 |
- 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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|
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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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|
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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. |
209 |
- 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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|
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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). |
223 |
- 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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|
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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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|
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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). |
250 |
- actually verify that local and remote port are matching in |
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libev's socketpair emulation, which makes denial-of-service |
252 |
attacks harder (but not impossible - it's windows). Make sure |
253 |
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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|
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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). |
273 |
- fixed const object callbacks in ev++.h. |
274 |
- 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. |
276 |
- do not try to watch the empty string via inotify. |
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- inotify watchers could be leaked under certain circumstances. |
278 |
- 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. |
280 |
- fixed some weirdness in the ev_embed documentation. |
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|
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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. |
286 |
- better mingw32 compatibility (it's not as borked as native win32) |
287 |
(analysed by Roger Pack). |
288 |
- include stdio.h in the example program, as too many people are |
289 |
confused by the weird C language otherwise. I guess the next thing |
290 |
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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|
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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 |
295 |
backend by assuming the kernel event mask hasn't changed if |
296 |
ADD fails with EEXIST. |
297 |
- work around spurious event notification bugs in epoll by using |
298 |
a 32-bit generation counter. recreate kernel state if we receive |
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spurious notifications or unwanted events. this is very costly, |
300 |
but I didn't come up with this horrible design. |
301 |
- use memset to initialise most arrays now and do away with the |
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init functions. |
303 |
- expand time-out strategies into a "Be smart about timeouts" section. |
304 |
- drop the "struct" from all ev_watcher declarations in the |
305 |
documentation and did other clarifications (yeah, it was a mistake |
306 |
to have a struct AND a function called ev_loop). |
307 |
- fix a bug where ev_default would not initialise the default |
308 |
loop again after it was destroyed with ev_default_destroy. |
309 |
- 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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|
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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 |
314 |
(reported by Yoann Vandoorselaere). |
315 |
- ev_stat erroneously would try to add inotify watchers |
316 |
even when inotify wasn't available (this should only |
317 |
have a performance impact). |
318 |
- ev_once now passes both timeout and io to the callback if both |
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occur concurrently, instead of giving timeouts precedence. |
320 |
- disable EV_USE_INOTIFY when sys/inotify.h is too old. |
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|
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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. |
325 |
- new function: ev_now_update (loop). |
326 |
- verify_watcher was not marked static. |
327 |
- improve the "associating..." manpage section. |
328 |
- documentation tweaks here and there. |
329 |
|
330 |
3.43 Sun Jul 6 05:34:41 CEST 2008 |
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- include more include files on windows to get struct _stati64 |
332 |
(reported by Chris Hulbert, but doesn't quite fix his issue). |
333 |
- add missing #include <io.h> in ev.c on windows (reported by |
334 |
Matt Tolton). |
335 |
|
336 |
3.42 Tue Jun 17 12:12:07 CEST 2008 |
337 |
- work around yet another windows bug: FD_SET actually adds fd's |
338 |
multiple times to the fd_*SET*, despite official MSN docs claiming |
339 |
otherwise. Reported and well-analysed by Matt Tolton. |
340 |
- define NFDBITS to 0 when EV_SELECT_IS_WINSOCKET to make it compile |
341 |
(reported any analysed by Chris Hulbert). |
342 |
- fix a bug in ev_ebadf (this function is only used to catch |
343 |
programming errors in the libev user). reported by Matt Tolton. |
344 |
- fix a bug in fd_intern on win32 (could lead to compile errors |
345 |
under some circumstances, but would work correctly if it compiles). |
346 |
reported by Matt Tolton. |
347 |
- (try to) work around missing lstat on windows. |
348 |
- pass in the write fd set as except fd set under windows. windows |
349 |
is so uncontrollably lame that it requires this. this means that |
350 |
switching off oobinline is not supported (but tcp/ip doesn't |
351 |
have oob, so that would be stupid anyways. |
352 |
- use posix module symbol to auto-detect monotonic clock presence |
353 |
and some other default values. |
354 |
|
355 |
3.41 Fri May 23 18:42:54 CEST 2008 |
356 |
- work around an obscure bug in winsocket select: if you |
357 |
provide only empty fd sets then select returns WSAEINVAL. how sucky. |
358 |
- improve timer scheduling stability and reduce use of time_epsilon. |
359 |
- use 1-based 2-heap for EV_MINIMAL, simplifies code, reduces |
360 |
codesize and makes for better cache-efficiency. |
361 |
- use 3-based 4-heap for !EV_MINIMAL. this makes better use |
362 |
of cpu cache lines and gives better growth behaviour than |
363 |
2-based heaps. |
364 |
- cache timestamp within heap for !EV_MINIMAL, to avoid random |
365 |
memory accesses. |
366 |
- document/add EV_USE_4HEAP and EV_HEAP_CACHE_AT. |
367 |
- fix a potential aliasing issue in ev_timer_again. |
368 |
- add/document ev_periodic_at, retract direct access to ->at. |
369 |
- improve ev_stat docs. |
370 |
- add portability requirements section. |
371 |
- fix manpage headers etc. |
372 |
- normalise WSA error codes to lower range on windows. |
373 |
- add consistency check code that can be called automatically |
374 |
or on demand to check for internal structures (ev_loop_verify). |
375 |
|
376 |
3.31 Wed Apr 16 20:45:04 CEST 2008 |
377 |
- added last minute fix for ev_poll.c by Brandon Black. |
378 |
|
379 |
3.3 Wed Apr 16 19:04:10 CEST 2008 |
380 |
- event_base_loopexit should return 0 on success |
381 |
(W.C.A. Wijngaards). |
382 |
- added linux eventfd support. |
383 |
- try to autodetect epoll and inotify support |
384 |
by libc header version if not using autoconf. |
385 |
- new symbols: EV_DEFAULT_UC and EV_DEFAULT_UC_. |
386 |
- declare functions defined in ev.h as inline if |
387 |
C99 or gcc are available. |
388 |
- enable inlining with gcc versions 2 and 3. |
389 |
- work around broken poll implementations potentially |
390 |
not clearing revents field in ev_poll (Brandon Black) |
391 |
(no such systems are known at this time). |
392 |
- work around a bug in realloc on openbsd and darwin, |
393 |
also makes the erroneous valgrind complaints |
394 |
go away (noted by various people). |
395 |
- fix ev_async_pending, add c++ wrapper for ev_async |
396 |
(based on patch sent by Johannes Deisenhofer). |
397 |
- add sensible set method to ev::embed. |
398 |
- made integer constants type int in ev.h. |
399 |
|
400 |
3.2 Wed Apr 2 17:11:19 CEST 2008 |
401 |
- fix a 64 bit overflow issue in the select backend, |
402 |
by using fd_mask instead of int for the mask. |
403 |
- rename internal sighandler to avoid clash with very old perls. |
404 |
- entering ev_loop will not clear the ONESHOT or NONBLOCKING |
405 |
flags of any outer loops anymore. |
406 |
- add ev_async_pending. |
407 |
|
408 |
3.1 Thu Mar 13 13:45:22 CET 2008 |
409 |
- implement ev_async watchers. |
410 |
- only initialise signal pipe on demand. |
411 |
- make use of sig_atomic_t configurable. |
412 |
- improved documentation. |
413 |
|
414 |
3.0 Mon Jan 28 13:14:47 CET 2008 |
415 |
- API/ABI bump to version 3.0. |
416 |
- ev++.h includes "ev.h" by default now, not <ev.h>. |
417 |
- slightly improved documentation. |
418 |
- speed up signal detection after a fork. |
419 |
- only optionally return trace status changed in ev_child |
420 |
watchers. |
421 |
- experimental (and undocumented) loop wrappers for ev++.h. |
422 |
|
423 |
2.01 Tue Dec 25 08:04:41 CET 2007 |
424 |
- separate Changes file. |
425 |
- fix ev_path_set => ev_stat_set typo. |
426 |
- remove event_compat.h from the libev tarball. |
427 |
- change how include files are found. |
428 |
- doc updates. |
429 |
- update licenses, explicitly allow for GPL relicensing. |
430 |
|
431 |
2.0 Sat Dec 22 17:47:03 CET 2007 |
432 |
- new ev_sleep, ev_set_(io|timeout)_collect_interval. |
433 |
- removed epoll from embeddable fd set. |
434 |
- fix embed watchers. |
435 |
- renamed ev_embed.loop to other. |
436 |
- added exported Symbol tables. |
437 |
- undefine member wrapper macros at the end of ev.c. |
438 |
- respect EV_H in ev++.h. |
439 |
|
440 |
1.86 Tue Dec 18 02:36:57 CET 2007 |
441 |
- fix memleak on loop destroy (not relevant for perl). |
442 |
|
443 |
1.85 Fri Dec 14 20:32:40 CET 2007 |
444 |
- fix some aliasing issues w.r.t. timers and periodics |
445 |
(not relevant for perl). |
446 |
|
447 |
(for historic versions refer to EV/Changes, found in the Perl interface) |
448 |
|
449 |
0.1 Wed Oct 31 21:31:48 CET 2007 |
450 |
- original version; hacked together in <24h. |
451 |
|