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290 lines
14 KiB
Plaintext
290 lines
14 KiB
Plaintext
Changes in version 2.1.2-alpha (?? ??? 2012)
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Changes in version 2.1.1-alpha (4 Apr 2012)
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Libevent 2.1.1-alpha includes a number of new features and performance
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improvements. The log below tries to organize them by rough area of
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effect. It omits some commits which were pure bugfixes on other commits
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listed below. For more detail, see the git changelogs. For more
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insight, see the "whatsnew-2.1.txt" document included in the Libevent
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2.1.1-alpha distribution.
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Performance: Core
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o Replace several TAILQ users with LIST. LIST can be a little faster than
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TAILQ for cases where we don't need queue-like behavior. (f9db33d,
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6494772, d313c29, 974d004)
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o Disabled code to optimize the case where we reinsert an existing
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timeout (e47042f, 09cbc3d)
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o Remove a needless base-notify when rescheduling the first timeout (77a96fd)
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o Save a needless comparison when removing/adjusting timeouts (dd5189b)
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o Possible optimization: split event_queue_insert/remove into
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separate functions. needs testing (efc4dc5)
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o Make event_count maintenance branchless at the expense of an
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extra shift. Needs benchmarking (d1cee3b)
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o In the 2.1 branch, let's try out lazy gettimeofday/clock_gettime
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comparison (2a83ecc)
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o Optimization in event_process_active(): ignore maxcb & endtime
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for highest priority events. (a9866aa Alexander Drozdov)
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o Bypass event_add when using event_base_once() for a 0-sec timeout (35c5c95)
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o Remove the eventqueue list and the ev_next pointers. (604569b 066775e)
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Performance: Evbuffers
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o Roughly 20% speed increase when line-draining a buffer using
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EVBUFFER_EOL_CRLF (5dde0f0 Mina Naguib)
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o Try to squeeze a little more speed out of EVBUFFER_EOL_CRLF (7b9d139)
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o Fix a bug in the improved EOL_CRLF code (d927965)
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o Remove a needless branch in evbuffer_drain() (d19a326)
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Performance: Linux
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o Infrastructure for using faster/fewer syscalls when creating
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sockets (a1c042b)
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o Minimize syscalls during socket creation in listener.c (7e9e289)
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o Use a wrapper function to create the notification
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pipe/socketpair/eventfd (ca76cd9)
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o Use pipes for telling signals to main thread when possible (a35f396)
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o Save syscalls when constructing listener sockets for evhttp (af6c9d8)
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o Save some syscalls when creating evdns sockets (713e570)
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o Save some syscalls when constructing a socket for a bufferevent (33fca62)
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o Prefer epoll_create1 on Linuxen that have it (bac906c)
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Performance: Epoll backend
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o Use current event set rather than current pending change when
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deciding whether to no-op a del (04ba27e Mike Smellie)
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o Replace big chain of if/thens in epoll.c with a table lookup (8c83eb6)
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o Clean up error handling in epoll_apply_one_change() a little (2d55a19)
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Performance: Evport backend
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o evport: use evmap_io to track fdinfo status. Should save time and
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RAM. (4687ce4)
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o evport: Remove a linear search over recent events when
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reactivating them (0f77efe)
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o evport: Use portev_user to remember fdinfo struct (276ec0e)
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o evport: don't scan more events in ed_pending than needed (849a5cf)
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o evport: Remove artificial low limit on max events per getn call (c04d927)
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o Reenable main/many_events_slow_add for evport in 2.1 (e903db3)
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Performance: Windows
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o Use GetSystemTimeAsFileTime to implement gettimeofday on
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win32. It's faster and more accurate than our old
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approach. (b8b8aa5)
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New functions and features: debugging
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o Add event_enable_debug_logging() to control use of debug logs (e30a82f)
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New functions and features: core
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o Add event_config function to limit time/callbacks between calls
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to dispatch (fd4de1e, 9fa56bd, a37a0c0, 3c63edd)
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o New EVLOOP_NO_EXIT_ON_EMPTY option to keep looping even when no
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events are pending (084e68f)
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o Add event_base_get_npriorities() function. (ee3a4ee Alexander Drozdov)
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o Make evbase_priority_init() and evbase_get_npriorities()
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threadsafe (3c55b5e)
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o New event_base_update_cache_time() to set cached_tv to current
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time (212533e Abel Mathew)
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o Add event_self_cbarg() to be used in conjunction with
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event_new(). (ed36e6a Ross Lagerwall, fa931bb, 09a1906, 1338e6c,
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33e43ef)
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o Add a new libevent_global_shutdown() to free all globals before
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exiting. (041ca00 Mark Ellzey, f98c158, 15296d0, 55e991b)
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o Use getifaddrs to detect our interfaces if possible (7085a45)
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o Add event_base_get_running_event() to get the event* whose cb we
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are in (c5732fd, 13dad99)
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New functions and features: building
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o Implement --enable-gcc-hardening configure option (7550267 Sebastian Hahn)
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New functions and features: evbuffers
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o Add evbuffer_add_file_segment() so one fd can be used efficiently
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in more than one evbuffer_add_file at a time (e72afae, c2d9884,
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3f405d2, 0aad014)
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o Fix windows file segment mappings (8254de7)
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o Allow evbuffer_ptr_set to yield a point just after the end of the
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buffer. (e6fe1da)
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o Allow evbuffer_ptr to point to position 0 in an empty evbuffer
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(7aeb2fd Nir Soffer)
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o Set the special "not found" evbuffer_ptr consistently. (e3e97ae Nir Soffer)
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o support adding buffers to other buffers non-destructively
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(9d7368a Joachim Bauch)
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o prevent nested multicast references, reworked locking (26041a8
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Joachim Bauch)
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o New EVBUFFER_EOL_NUL to read NUL-terminated strings from an
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evbuffer (d7a8b36 Andrea Montefusco, 54142c9)
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o Make evbuffer_file_segment_types adaptable (c6bbbf1)
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o Added evbuffer_add_iovec and unit tests. (aaec5ac Mark Ellzey, 27b5398)
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o Add evbuffer_copyout_from to copy data from the middle of a
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buffer (27e2225)
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New functions and features: bufferevents
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o Allow users to set allow_dirty_shutdown (099d27d Catalin Patulea)
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o Tweak allow_dirty_shutdown documentation (a44cd2b)
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o Fix two issues in the allow_dirty_shutdown code. (f3b89de)
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o Add a bufferevent_getcb() to find a bufferevent's current
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callbacks (a650394)
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o bufferevent: Add functions to set/get max_single_read/write
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values. (998c813 Alexander Drozdov)
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o bev_ssl: Be more specific in event callbacks. evhttp in particular gets
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confused without at least one of BEV_EVENT_{READING|WRITING}. (f7eb69a
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Catalin Patulea)
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New functions and features: evconnlisteners
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o Support TCP_DEFER_ACCEPT sockopts for listeners (5880e4a Mark Ellzey,
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a270728)
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o Add another caveat to the TCP_DEFER_ACCEPT documentation (a270728)
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o Allow evconnlistener to be created in disabled state. (9593a33
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Alexander Drozdov)
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o The LEV_OPT_CLOSE_ON_EXEC flag now applies to accepted listener
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sockets too (4970329)
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Evhttp:
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o Add new evhttp_{connection_}set_timeout_tv() functions to set
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finger-grained http timeouts (6350e6c Constantine Verutin)
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o Performance tweak to evhttp_parse_request_line. (aee1a97 Mark Ellzey)
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o Add missing break to evhttp_parse_request_line (0fcc536)
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o Add evhttp callback for bufferevent creation; this lets evhttp
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support SSL. (8d3a850)
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o Remove calls to deprecated bufferevent functions from evhttp.c (4d63758)
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o evhttp: Add evhttp_foreach_bound_socket. (a2c48e3 Samy Al Bahra)
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Build improvements:
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o Add AC_USE_SYSTEM_EXTENSIONS to configure.in. Requires follow on
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patches for correctness and robustness. (1fa7dbe Kevin Bowling)
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o Filter '# define' statements from autoconf and generate
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event-private.h (321b558 Kevin Bowling)
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o Remove internal usage of _GNU_SOURCE (3b26541 Kevin Bowling)
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o Eliminate a couple more manual internal _GNU_SOURCE defines (c51ef93
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Kevin Bowling)
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o Add AC_GNU_SOURCE to the fallback case. (ea8fa4c Kevin Bowling)
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o Use a Configuration Header Template for evconfig-private.h (868f888
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Kevin Bowling)
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o Fix a comment warning and add evconfig-private.h to .gitignore
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(f6d66bc Kevin Bowling)
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o Include evconfig-private.h in internal files for great good. (0915ca0
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Kevin Bowling)
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o Backport libevent to vanilla Autoconf 2.59 (as used in RHEL5)
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(ad03952 Kevin Bowling)
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o Prefer the ./configure evconfig-private.h in MinGW, just in
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case. (f964b72 Kevin Bowling)
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o Shell hack for weird mkdir -p commands (fd7b5a8 Kevin Bowling)
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o Add evconfig-private to remaining files (ded0a09 Kevin Bowling)
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o Allow use of --enable-silent-rules for quieter compilation with
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automake 1.11 (f1f8514 Dave Hart)
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o Use "_WIN32", not WIN32: it's standard and we don't need to fake it
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(9f560b)
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o In configure, test for _WIN32 not WIN32. (85078b1 Peter Rosin)
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o Do not define WIN32 in Makefile.nmake (d41f3ea Peter Rosin)
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o Provide the autoconf m4 macros for the new OpenSSL via pkg-config
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stuff. (674dc3d Harlan Stenn)
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o Use pkg-config (if available) to handle OpenSSL. (1c63860 Harlan Stenn)
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o We need AM_CPPFLAGS when compiling bufferevent_openssl.c (6d2613b
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Harlan Stenn)
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o Fix OSX build: $(OPENSSL_INCS) needs to be after
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$(AM_CPPFLAGS). (46f1769 Zack Weinberg)
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o Make gcc warnings on by default, and --enable-gcc-warnings only add
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-Werror (d46517e Sebastian Hahn)
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o Split up extra-long AC_CHECK_FUNCS/HEADERS lines in configure.in (88a30ad)
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o Move libevent 1.x headers to include/, to put all public headers in
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one place. (bbea8d6)
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o Put #ifdef around some files to support alternate build
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systems. (76d4c92 Ross Lagerwall)
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o Also make win32select.c conditional for IDE users (bf2c5a7)
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Debugging:
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o Add a magic number to debug_locks to better catch lock-coding
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errors. (b4a29c0 Dave Hart)
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o munge the debug_lock signature before freeing it: it might help us
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catch use-after-free (f28084d)
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o Added --enable-event-debugging in configure (bc7b4e4, a9c2c9a Mark Ellzey)
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o Debug addition for printing usec on TIMEOUT debugging. (ac43ce0 Mark Ellzey)
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o Added usec debug in another area for debug (3baab0d Mark Ellzey)
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o added timeout debug logs to include event ptr. (4b7d298 Mark Ellzey)
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o more event dbg updates (6727543 Mark Ellzey)
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o Clarify event_enable_debug_logging a little (6207826)
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o Make --enable-verbose-debug option match its help text (10c3450)
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o Add argument checks to some memory functions in `event.c'. (c8953d1
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Mansour Moufid)
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Testing:
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o More abstraction in test.sh (cd74c4e)
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o Add failing test for evbuffer_search_range. (8e26154 Nir Soffer)
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o Tweaks to return types with end-of-buf ptrs (9ab8ab8)
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o Add an (internal) usleep function for use by unit tests (f25d9d3)
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o Synchronize with upstream tinytest (6c81be7)
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o Make test-changelist faster (7622d26)
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o Reduce the timeout in the main/fork test. (ab14f7c)
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o New evhttp function to adjust initial retry timeout (350a3c4)
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o Make regression tests run over 3x faster. (67a1763)
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o Use test_timeval_diff_eq more consistently (b77b43f)
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o Allow more slop in deferred_cb_skew test; freebsd needs it (b9f7e5f)
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o When including an -internal.h header outside the main tree, do so
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early (95e2455)
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o Add a new test: test-fdleak which tests for fd leaks by creating many
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sockets. (2ef9278 Ross Lagerwall, f7af194, 1c4288f, etc)
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o Add a unit test for event_base_dump_events() (7afe48a, 8d08cce)
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o Test more bufferevent_ratelim features (c24f91a)
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Documentation:
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o Improve evbuffer_ptr documentation (261ba63)
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o added comments to describe refcounting of multicast chains (ba24f61
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Joachim Bauch)
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o Add doxygen for event_base_dump_events (cad5753)
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OSX:
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o Use "unlimited select" on OSX so that we can have more than
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FD_SETSIZE fds (1fb5cc6)
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KQueue:
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o Use SIG_IGN instead of a do-nothing handler for signal events with
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kqueue (148458e Zack Weinberg)
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evprc:
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o event_rpcgen.py now prints status information to stdout and errors to
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stderr. (ffb0ba0 Ross Lagerwall)
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Code improvement and refactoring:
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o Make event_reinit() more robust and maintainable (272033e)
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o Restore fast-path event_reinit() for slower backends (2c4b5de)
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o Check changelist as part of checking representational integrity (39b3f38)
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o Fix a compile warning in event_reinit (e4a56ed Sebastian Hahn)
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o Refactor the functions that run over every event. (c89b4e6)
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o Remove the last vestiges of _EVENT_USE_EVENTLIST (a3cec90)
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o Make event-config.h depend on Makefile.am (2958a5c)
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Build fixes:
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o Don't do clang version detection when disabling some flags (083296b
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Sebastian Hahn)
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C standards conformance:
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o Check for NULL return on win32 mm_calloc, and set ENOMEM. (af7ba69)
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o Convert event-config.h macros to avoid reserved identifiers (68120d9)
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o Generate event-config.h using the correct macros. (f82c57e)
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o Convert include-guard macro convention to avoid reserved identifiers
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(3f8c7cd)
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o Make event_rpcgen.py output conform to identifier conventions (372bff1)
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o Stop referring to an obsolete include guard in bench_http.h (5c0f7e0)
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o Make the generated event-config.h use correct include guards (639383a)
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o Fix all identifiers with names beginning with underscore. (cb9da0b)
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o Make event_rpcgen.py output conform to identifier conventions, more
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(bcefd24)
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o Fix some problems introduced by automated identifier cleanup script
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(c963534)
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o Have all visible internal function names end with an underscore. (8ac3c4c)
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o Apply the naming convention to our EVUTIL_IS* functions (c7848fa)
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o Clean up lingering _identifiers. (946b584)
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o Fix doxygen to use new macro conventions (da455e9)
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Bugfixes:
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o Do not use system EAI/AI values if we are not using the system
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getaddrinfo. (7bcac07)
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Sample Code:
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o Fix up sample/event-test.c to use newer interfaces and make it
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actually work. (19bab4f Ross Lagerwall)
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o On Unix, remove event.fifo left by sample/event-test.c. (c0dacd2 Ross
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Lagerwall)
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o Rename event-test.c to event-read-fifo.c. (a5b370a Ross Lagerwall)
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o event-read-fifo: Use EV_PERSIST appropriately (24dab0b)
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