--- libev/Changes 2011/08/25 17:39:43 1.239 +++ libev/Changes 2019/12/24 13:24:29 1.351 @@ -1,10 +1,187 @@ Revision history for libev, a high-performance and full-featured event loop. -TODO: ev_loop_wakeup +TODO: revisit 59.x timer in the light of modern powersaving +TODO: document EV_TSTAMP_T -TODO: EV_NO_THREADS/NO_SMP and/or EV_USE_PTHREADS or so. also document. -TODO: #define EV_API_DECL static? ev_default_loop_ptr? -4.10 + - the new timerfd code wrongly changed the priority of ther signal + fd watcher, which is usuallys harmless unless signal fds are + also used. + +4.31 Fri Dec 20 21:58:29 CET 2019 + - handle backends with minimum wait time a bit better by not + waiting in the presence of already-expired timers + (behaviour reported by Felipe Gasper). + - new feature: use timerfd to detect timejumps quickly, + can be disabled with the new EVFLAG_NOTIMERFD loop flag. + - document EV_USE_SIGNALFD feature macro. + +4.30 (EV only) + - change non-autoconf test for __kernel_rwf_t by testing + LINUX_VERSION_CODE, the most direct test I could find. + - fix a bug in the io_uring backend that polled the wrong + backend fd, causing it to not work in many cases. + +4.29 (EV only) + - add io uring autoconf and non-autoconf detection. + - disable io_uring when some header files are too old. + +4.28 (EV only) + - linuxaio backend resulted in random memory corruption + when loop is forked. + - linuxaio backend might have tried to cancel an iocb + multiple times (was unable to trigger this). + - linuxaio backend now employs a generation counter to + avoid handling spurious events from cancelled requests. + - io_cancel can return EINTR, deal with it. also, assume + io_submit also returns EINTR. + - fix some other minor bugs in linuxaio backend. + - ev_tstamp type can now be overriden by defining EV_TSTAMP_T. + - cleanup: replace expect_true/false and noinline by their + libecb counterparts. + - move syscall infrastructure from ev_linuxaio.c to ev.c. + - prepare io_uring integration. + - tweak ev_floor. + - epoll, poll, win32 Sleep and other places that use millisecond + reslution now all try to round up times. + - solaris port backend didn't compile. + - abstract time constants into their macros, for more flexibility. + +4.27 Thu Jun 27 22:43:44 CEST 2019 + - linux aio backend almost completely rewritten to work around its + limitations. + - linux aio backend now requires linux 4.19+. + - epoll backend now mandatory for linux aio backend. + - fail assertions more aggressively on invalid fd's detected + in the event loop, do not just silently fd_kill in case of + user error. + - ev_io_start/ev_io_stop now verify the watcher fd using + a syscall when EV_VERIFY is 2 or higher. + +4.26 (EV only) + - update to libecb 0x00010006. + - new experimental linux aio backend (linux 4.18+). + - removed redundant 0-ptr check in ev_once. + - updated/extended ev_set_allocator documentation. + - replaced EMPTY2 macro by array_needsize_noinit. + - minor code cleanups. + - epoll backend now uses epoll_create1 also after fork. + +4.25 Fri Dec 21 07:49:20 CET 2018 + - INCOMPATIBLE CHANGE: EV_THROW was renamed to EV_NOEXCEPT + (EV_THROW still provided) and now uses noexcept on C++11 or newer. + - move the darwin select workaround higher in ev.c, as newer versions of + darwin managed to break their broken select even more. + - ANDROID => __ANDROID__ (reported by enh@google.com). + - disable epoll_create1 on android because it has broken header files + and google is unwilling to fix them (reported by enh@google.com). + - avoid a minor compilation warning on win32. + - c++: remove deprecated dynamic throw() specifications. + - c++: improve the (unsupported) bad_loop exception class. + - backport perl ev_periodic example to C, untested. + - update libecb, biggets change is to include a memory fence + in ECB_MEMORY_FENCE_RELEASE on x86/amd64. + - minor autoconf/automake modernisation. + +4.24 Wed Dec 28 05:19:55 CET 2016 + - bump version to 4.24, as the release tarball inexplicably + didn't have the right version in ev.h, even though the cvs-tagged + version did have the right one (reported by Ales Teska). + +4.23 Wed Nov 16 18:23:41 CET 2016 + - move some declarations at the beginning to help certain retarded + microsoft compilers, even though their documentation claims + otherwise (reported by Ruslan Osmanov). + +4.22 Sun Dec 20 22:11:50 CET 2015 + - when epoll detects unremovable fds in the fd set, rebuild + only the epoll descriptor, not the signal pipe, to avoid + SIGPIPE in ev_async_send. This doesn't solve it on fork, + so document what needs to be done in ev_loop_fork + (analyzed by Benjamin Mahler). + - remove superfluous sys/timeb.h include on win32 + (analyzed by Jason Madden). + - updated libecb. + +4.20 Sat Jun 20 13:01:43 CEST 2015 + - prefer noexcept over throw () with C++ 11. + - update ecb.h due to incompatibilities with c11. + - fix a potential aliasing issue when reading and writing + watcher callbacks. + +4.19 Thu Sep 25 08:18:25 CEST 2014 + - ev.h wasn't valid C++ anymore, which tripped compilers other than + clang, msvc or gcc (analyzed by Raphael 'kena' Poss). Unfortunately, + C++ doesn't support typedefs for function pointers fully, so the affected + declarations have to spell out the types each time. + - when not using autoconf, tighten the check for clock_gettime and related + functionality. + +4.18 Fri Sep 5 17:55:26 CEST 2014 + - events on files were not always generated properly with the + epoll backend (testcase by Assaf Inbal). + - mark event pipe fd as cloexec after a fork (analyzed by Sami Farin). + - (ecb) support m68k, m88k and sh (patch by Miod Vallat). + - use a reasonable fallback for EV_NSIG instead of erroring out + when we can't detect the signal set size. + - in the absence of autoconf, do not use the clock syscall + on glibc >= 2.17 (avoids the syscall AND -lrt on systems + doing clock_gettime in userspace). + - ensure extern "C" function pointers are used for externally-visible + loop callbacks (not watcher callbacks yet). + - (ecb) work around memory barriers and volatile apparently both being + broken in visual studio 2008 and later (analysed and patch by Nicolas Noble). + +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. + - choose 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 hopefully 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 @@ -21,6 +198,14 @@ - 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. 4.04 Wed Feb 16 09:01:51 CET 2011 - fix two problems in the native win32 backend, where reuse of fd's @@ -116,7 +301,7 @@ 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, + - ev_stat watchers could keep an erroneous 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 @@ -184,8 +369,8 @@ 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. + - add documentation section about priorities. + - add a glossary to the documentation. - extend the ev_fork description slightly. - optimize a jump out of call_pending.