Edit

kc3-lang/libevent/ChangeLog-2.1

Branch :

  • Show log

    Commit

  • Author : Nick Mathewson
    Date : 2012-03-22 17:33:12
    Hash : 7ae08e50
    Message : Write a first draft of whatsnew-2.1.txt

  • ChangeLog-2.1 
  • Contains stuff through 3e9612cd81c8a9881ef298fa59c40af343e4f126

 Performance: Core
   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 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 Remove the eventqueue list and the ev_next pointers. (604569b 066775e)

 Performance: Evbuffers
   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)

 Performance: Linux
   o Infrastructure for using faster/fewer syscalls when creating sockets (a1c042b)
   o Minimize syscalls during socket creation in listener.c (7e9e289)
   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)

 Performance: 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)

 Performance: 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)

 Performance: Windows
   o Use GetSystemTimeAsFileTime to implement gettimeofday on win32. It's faster and more accurate than our old approach. (b8b8aa5)

 New functions and features: debugging
   o Add event_enable_debug_logging() to control use of debug logs (e30a82f)

 New functions and features: core
   o Add event_config function to limit time/callbacks between calls to dispatch (fd4de1e, 9fa56bd, a37a0c0, 3c63edd)
   o New EVLOOP_NO_EXIT_ON_EMPTY option to keep looping even when no events are pending (084e68f)
   o Add event_base_get_npriorities() function. (ee3a4ee Alexander Drozdov)
   o Make evbase_priority_init() and evbase_get_npriorities() threadsafe (3c55b5e)   o New event_base_update_cache_time() to set cached_tv to current time (212533e Abel Mathew)
   o Add event_self_cbarg() to be used in conjunction with event_new(). (ed36e6a Ross Lagerwall, fa931bb, 09a1906, 1338e6c, 33e43ef)
   o Add a new libevent_global_shutdown() to free all globals before exiting. (041ca00 Mark Ellzey)
   o Use getifaddrs to detect our interfaces if possible (7085a45)
   o Fix compilation of windows evutil_check_ifaddrs (40a3c52)

 New functions and features: building
   o Implement --enable-gcc-hardening configure option (7550267 Sebastian Hahn)

 New functions and features: evbuffers
   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 New EVBUFFER_EOL_NUL to read NUL-terminated strings from an evbuffer (d7a8b36 Andrea Montefusco, 54142c9)
   o Make evbuffer_file_segment_types adaptable (c6bbbf1)
   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)

 New functions and features: bufferevents
   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 Add a bufferevent_getcb() to find a bufferevent's current callbacks (a650394)   o bufferevent: Add functions to set/get max_single_read/write values. (998c813 Alexander Drozdov)
   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)
 New functions and features: evconnlisteners
   o Support TCP_DEFER_ACCEPT sockopts for listeners (5880e4a Mark Ellzey, a270728)
   o Add another caveat to the TCP_DEFER_ACCEPT documentation (a270728)
   o Allow evconnlistener to be created in disabled state. (9593a33 Alexander Drozdov)
   o The LEV_OPT_CLOSE_ON_EXEC flag now applies to accepted listener sockets too (4970329)

 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)

 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)

 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 Add an (internal) usleep function for use by unit tests (f25d9d3)
   o Synchronize with upstream tinytest (6c81be7)
   o Make test-changelist faster (7622d26)
   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)
   o Add a new test: test-fdleak which tests for fd leaks by creating many sockets. (2ef9278 Ross Lagerwall, f7af194, 1c4288f 4293a80, c9ba53a 077c7e9 d9be5f4 d7d9f75)

 Documentation:
   o Improve evbuffer_ptr documentation (261ba63)
   o added comments to describe refcounting of multicase chains (ba24f61 Joachim Bauch)
   o Add doxygen for event_base_dump_events (cad5753)

  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)

 evprc:
   o event_rpcgen.py now prints status information to stdout and errors to stderr. (ffb0ba0 Ross Lagerwall)

 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)
   o Refactor the functions that run over every event. (c89b4e6)
   o Remove the last vestiges of _EVENT_USE_EVENTLIST (a3cec90)
   o Make event-config.h depend on Makefile.am (2958a5c)

 Build fixes:
   o Don't do clang version detection when disabling some flags (083296b Sebastian Hahn)

 C standards conformance:
   o Check for NULL return on win32 mm_calloc, and set ENOMEM. (af7ba69)
   o Convert event-config.h macros to avoid reserved identifiers (68120d9)
   o Generate event-config.h using the correct macros. (f82c57e)
   o Convert include-guard macro convention to avoid reserved identifiers (3f8c7cd)
   o Make event_rpcgen.py output conform to indentifier conventions (372bff1)
   o Stop referring to an obsolete include guard in bench_http.h (5c0f7e0)
   o Make the generated event-config.h use correct include guards (639383a)
   o Fix all identifiers with names beginning with underscore. (cb9da0b)
   o Make event_rpcgen.py output conform to indentifier conventions, more (bcefd24)
   o Fix some problems introduced by automated identifier cleanup script (c963534)
   o Have all visible internal function names end with an underscore. (8ac3c4c)
   o Apply the naming convention to our EVUTIL_IS* functions (c7848fa)
   o Clean up lingering _identifiers. (946b584)
   o Fix doxygen to use new macro conventions (da455e9)

 Bugfixes:
   o Do not use system EAI/AI values if we are not using the system getaddrinfo. (7bcac07)

 Sample Code:
   o Fix up sample/event-test.c to use newer interfaces and make it actually work. (19bab4f Ross Lagerwall)
   o On Unix, remove event.fifo left by sample/event-test.c. (c0dacd2 Ross Lagerwall)
   o Rename event-test.c to event-read-fifo.c. (a5b370a Ross Lagerwall)
   o event-read-fifo: Use EV_PERSIST appropriately (24dab0b)