From 819e98ac7da8ab69ff68b154caaf747aa8ecc4cc Mon Sep 17 00:00:00 2001 From: Nick Mathewson Date: Thu, 16 Feb 2012 01:21:42 -0500 Subject: [PATCH] Start work on a 2.1 changelog and whats-new --- ChangeLog-2.1 | 191 +++++++++++++++++++++++++++++++++++++++++++++++ whatsnew-2.1.txt | 17 +++++ 2 files changed, 208 insertions(+) create mode 100644 ChangeLog-2.1 create mode 100644 whatsnew-2.1.txt diff --git a/ChangeLog-2.1 b/ChangeLog-2.1 new file mode 100644 index 00000000..c86d4eff --- /dev/null +++ b/ChangeLog-2.1 @@ -0,0 +1,191 @@ + +Contains stuff through a270728e28e9b4107a9839d9dd8d30182139114c + + Performance: + + o Replace several TAILQ users with LIST. LIST can be a little faster than + TAILQ for cases where we don't need queue-like behavior. (f9db33d, + 6494772, d313c29, 974d004) + o Optimize the case where we reinsert an existing timeout (e47042f) + o Remove a needless base-notify when rescheduling the first timeout (77a96fd) + o Save a needless comparison when removing/adjusting timeouts (dd5189b) + o possible optimization: split event_queue_insert/remove into separate functions. needs testing (efc4dc5) + o Make event_count maintainance branchless at the expense of an extra shift. Needs benchmarking (d1cee3b) + o In the 2.1 branch, let's try out lazy gettimeofday/clock_gettime comparison (2a83ecc) + o Roughly 20% speed increase when line-draining a buffer using EVBUFFER_EOL_CRLF (5dde0f0 Mina Naguib) + o Try to squeeze a little more speed out of EVBUFFER_EOL_CRLF (7b9d139) + o Fix a bug in the improved EOL_CRLF code (d927965) + o Remove a needless branch in evbuffer_drain() (d19a326) + o Optimization in event_process_active(): ignore maxcb & endtime for highest priority events. (a9866aa Alexander Drozdov) + o Bypass event_add when using event_base_once() for a 0-sec timeout (35c5c95) + o Infrastructure for using faster/fewer syscalls when creating sockets (a1c042b) + o Minimize syscalls during socket creation in listener.c (7e9e289) + o The LEV_OPT_CLOSE_ON_EXEC flag now applies to accepted listener sockets too (4970329) + o Use a wrapper function to create the notification pipe/socketpair/eventfd (ca76cd9) + o Use pipes for telling signals to main thread when possible (a35f396) + o Save syscalls when constructing listener sockets for evhttp (af6c9d8) + o Save some syscalls when creating evdns sockets (713e570) + o Save some syscalls when constructing a socket for a bufferevent (33fca62) + o Prefer epoll_create1 on Linuxen that have it (bac906c) + o Fix compilation on osx (2b0a2c4) + o Infrastructure for using faster/fewer syscalls when creating sockets (a1c042b) + o Minimize syscalls during socket creation in listener.c (7e9e289) + o The LEV_OPT_CLOSE_ON_EXEC flag now applies to accepted listener sockets too (4970329) + o Use a wrapper function to create the notification pipe/socketpair/eventfd (ca76cd9) + o Use pipes for telling signals to main thread when possible (a35f396) + o Save syscalls when constructing listener sockets for evhttp (af6c9d8) + o Save some syscalls when creating evdns sockets (713e570) + o Save some syscalls when constructing a socket for a bufferevent (33fca62) + o Prefer epoll_create1 on Linuxen that have it (bac906c) + o Fix compilation on osx (2b0a2c4) + o If open(O_CLOEXEC) fails, fall back to fcntl(CLOEXEC) (2ed4430) + o Support TCP_DEFER_ACCEPT sockopts for listeners (5880e4a Mark Ellzey) + o Add another caveat to the TCP_DEFER_ACCEPT documentation (a270728) + + + Epoll backend: + o Use current event set rather than current pending change when deciding whether to no-op a del (04ba27e Mike Smellie) + o Replace big chain of if/thens in epoll.c with a table lookup (8c83eb6) + o Clean up error handling in epoll_apply_one_change() a little (2d55a19) + + Windows: + o Use GetSystemTimeAsFileTime to implement gettimeofday on win32. It's faster and more accurate than our old approach. (b8b8aa5) + + New functions and features: + o Add event_enable_debug_logging() to control use of debug logs (e30a82f) + o Add evbuffer_add_file_segment() so one fd can be used efficiently in more than one evbuffer_add_file at a time (e72afae, c2d9884, 3f405d2, 0aad014) + o Fix windows file segment mappings (8254de7) + o Allow evbuffer_ptr_set to yield a point just after the end of the buffer. (e6fe1da) + o Allow evbuffer_ptr to point to position 0 in an empty evbuffer (7aeb2fd Nir Soffer) + o Set the special "not found" evbuffer_ptr consistantly. (e3e97ae Nir Soffer) + o support adding buffers to other buffers non-destructively (9d7368a Joachim Bauch) + o prevent nested multicast references, reworked locking (26041a8 Joachim Bauch) + o Add event_config function to limit time/callbacks between calls to dispatch (fd4de1e) + o Make sure max_dispatch_callbacks is never negative (9fa56bd) + o Make max_dispatch_interval able to apply only to low-priority events (a37a0c0) + o Make the priority inversion code use gettime(), not evutil_gettimeofday() (3c63edd) + o Build with large-file support on platforms where it matters (8a23104) + o Implement --enable-gcc-hardening configure option (7550267 Sebastian Hahn) + o Allow evconnlistener to be created in disabled state. (9593a33 Alexander Drozdov) + o New EVLOOP_NO_EXIT_ON_EMPTY option to keep looping even when no events are pending (084e68f) + o Make evbuffer_file_segment_types adaptable (c6bbbf1) + o Add event_base_get_npriorities() function. (ee3a4ee Alexander Drozdov) + o Make evbase_priority_init() and evbase_get_npriorities() threadsafe (3c55b5e) + o bufferevent: Add functions to set/get max_single_read/write values. (998c813 Alexander Drozdov) + o New event_base_update_cache_time() to set cached_tv to current time (212533e Abel Mathew) + o Added evbuffer_add_iovec and unit tests. (aaec5ac Mark Ellzey, 27b5398) + o Add evbuffer_copyout_from to copy data from the middle of a buffer (27e2225) + o Use getifaddrs to detect our interfaces if possible (7085a45) + o Fix compilation of windows evutil_check_ifaddrs (40a3c52) + o Add a bufferevent_getcb() to find a bufferevent's current callbacks (a650394) + + Evhttp: + o Add new evhttp_{connection_}set_timeout_tv() functions to set finger-grained http timeouts (6350e6c Constantine Verutin) + o Performance tweak to evhttp_parse_request_line. (aee1a97 Mark Ellzey) + o Add missing break to evhttp_parse_request_line (0fcc536) + o Add evhttp callback for bufferevent creation; this lets evhttp support SSL. (8d3a850) + o Remove calls to deprecated bufferevent functions from evhttp.c (4d63758) + o evhttp: Add evhttp_foreach_bound_socket. (a2c48e3 Samy Al Bahra) + + + Bufferevents: + o bev_ssl: Be more specific in event callbacks. evhttp in particular gets confused without at least one of BEV_EVENT_{READING|WRITING}. (f7eb69a Catalin Patulea) + + Build improvements + o Add AC_USE_SYSTEM_EXTENSIONS to configure.in. Requires follow on patches for correctness and robustness. (1fa7dbe Kevin Bowling) + o Filter '# define' statements from autoconf and generate event-private.h (321b558 Kevin Bowling) + o Remove internal usage of _GNU_SOURCE (3b26541 Kevin Bowling) + o Eliminate a couple more manual internal _GNU_SOURCE defines (c51ef93 Kevin Bowling) + o Add AC_GNU_SOURCE to the fallback case. (ea8fa4c Kevin Bowling) + o Use a Configuration Header Template for evconfig-private.h (868f888 Kevin Bowling) + o Fix a comment warning and add evconfig-private.h to .gitignore (f6d66bc Kevin Bowling) + o Include evconfig-private.h in internal files for great good. (0915ca0 Kevin Bowling) + o Backport libevent to vanilla Autoconf 2.59 (as used in RHEL5) (ad03952 Kevin Bowling) + o Prefer the ./configure evconfig-private.h in MinGW, just in case. (f964b72 Kevin Bowling) + o Shell hack for weird mkdir -p commands (fd7b5a8 Kevin Bowling) + o Add evconfig-private to remaining files (ded0a09 Kevin Bowling) + o Allow use of --enable-silent-rules for quieter compilation with automake 1.11 (f1f8514 Dave Hart) +f) + o Use "_WIN32", not WIN32: it's standard and we don't need to fake it (9f560b) + o In configure, test for _WIN32 not WIN32. (85078b1 Peter Rosin) + o Do not define WIN32 in Makefile.nmake (d41f3ea Peter Rosin) + o Provide the autoconf m4 macros for the new OpenSSL via pkg-config stuff. (674dc3d Harlan Stenn) + o Use pkg-config (if available) to handle OpenSSL. (1c63860 Harlan Stenn) + o We need AM_CPPFLAGS when compiling bufferevent_openssl.c (6d2613b Harlan Stenn) + o Fix OSX build: $(OPENSSL_INCS) needs to be after $(AM_CPPFLAGS). (46f1769 Zack Weinberg) + o Make gcc warnings on by default, and --enable-gcc-warnings only add -Werror (d46517e Sebastian Hahn) + o Split up extra-long AC_CHECK_FUNCS/HEADERS lines in configure.in (88a30ad) + o Move libevent 1.x headers to include/, to put all public headers in one place. (bbea8d6) + o Put #ifdef around some files to support alternate build systems. (76d4c92 Ross Lagerwall) + o Also make win32select.c conditional for IDE users (bf2c5a7) + + + Debugging: + o Add a magic number to debug_locks to better catch lock-coding errors. (b4a29c0 Dave Hart) + o munge the debug_lock signature before freeing it: it might help us catch use-after-free (f28084d) + o Added --enable-event-debugging in configure (bc7b4e4, a9c2c9a Mark Ellzey) + o Debug addition for printing usec on TIMEOUT debugging. (ac43ce0 Mark Ellzey) + o Added usec debug in another area for debug (3baab0d Mark Ellzey) + o added timeout debug logs to include event ptr. (4b7d298 Mark Ellzey) + o more event dbg updates (6727543 Mark Ellzey) + o Clarify event_enable_debug_logging a little (6207826) + o Make --enable-verbose-debug option match its help text (10c3450) + o Add argument checks to some memory functions in `event.c'. (c8953d1 Mansour Moufid) + + + Evport backend: + o evport: use evmap_io to track fdinfo status. Should save time and RAM. (4687ce4) + o evport: Remove a linear search over recent events when reactivating them (0f77efe) + o evport: Use portev_user to remember fdinfo struct (276ec0e) + o evport: don't scan more events in ed_pending than needed (849a5cf) + o evport: Remove artificial low limit on max events per getn call (c04d927) + o Reenable main/many_events_slow_add for evport in 2.1 (e903db3) + + + Huh what: + o Allow base-notification functions to exist without setting an fd (94b8e67) + o Use the free-trailing-chains function in evbuffer_insert_chain too (b18c04d) + o Allow users to set allow_dirty_shutdown (099d27d Catalin Patulea) + o Tweak allow_dirty_shutdown documentation (a44cd2b) + o Fix two issues in the allow_dirty_shutdown code. (f3b89de) + o Changed use of refcounts to make sure referenced chains are freed in all cases. (a8e5e2f Joachim Bauch) + o fix windows compilation issues with new file segment code (da45aa7) + + Testing: + o More abstraction in test.sh (cd74c4e) + o Add failing test for evbuffer_search_range. (8e26154 Nir Soffer) + o Tweaks to return types with end-of-buf ptrs (9ab8ab8) + o New EVBUFFER_EOL_NUL to read NUL-terminated strings from an evbuffer (d7a8b36 Andrea Montefusco, 54142c9) + o Add an (internal) usleep function for use by unit tests (f25d9d3) + o Synchronize with upstream tinytest (6c81be7) + o Make test-changelist faster (7622d26) + + + Documentation: + o Improve evbuffer_ptr documentation (261ba63) + o added comments to describe refcounting of multicase chains (ba24f61 Joachim Bauch) + o Reduce the timeout in the main/fork test. (ab14f7c) + o New evhttp function to adjust initial retry timeout (350a3c4) + o Make regression tests run over 3x faster. (67a1763) + o Use test_timeval_diff_eq more consistently (b77b43f) + o Allow more slop in deferred_cb_skew test; freebsd needs it (b9f7e5f) + o When including an -internal.h header outside the main tree, do so early (95e2455) + + + OSX: + o Use "unlimited select" on OSX so that we can have more than FD_SETSIZE fds (1fb5cc6) + + + KQueue: + o Use SIG_IGN instead of a do-nothing handler for signal events with kqueue (148458e Zack Weinberg) + + + Code improvement and refactoring: + o Make event_reinit() more robust and maintainable (272033e) + o Restore fast-path event_reinit() for slower backends (2c4b5de) + o Check changelist as part of checking representational integrity (39b3f38) + o Fix a compile warning in event_reinit (e4a56ed Sebastian Hahn) + + + + diff --git a/whatsnew-2.1.txt b/whatsnew-2.1.txt new file mode 100644 index 00000000..3b877ab5 --- /dev/null +++ b/whatsnew-2.1.txt @@ -0,0 +1,17 @@ + What's new in Libevent 2.1 + +0. Before we start + +0.1. About this document + + This document describes the key differences between Libevent 1.4 and + Libevent 2.0, from a user's point of view. It's a work in progress. + + For better documentation about libevent, see the links at + http://libevent.org/ + + To + +0.2. Where to get help + + -- 2.40.0