| 1 | Revision history for libev, a high-performance and full-featured event loop. |
1 | Revision history for libev, a high-performance and full-featured event loop. |
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2 | |
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3 | TODO: ev_loop_wakeup |
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4 | TODO: EV_STANDALONE == NO_HASSEL (do not use clock_gettime in ev_standalone) |
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5 | |
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6 | TODO: document WSA_EV_USE_SOCKET in win32 part |
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7 | TODO: ^ OR use WSASend/WSARecv on the handle, which always works |
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8 | TODO: faq, process a thing in each iteration |
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9 | - queueing pending watchers of higher priority from a watcher now invokes |
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10 | them in a timely fashion (reported by Denis Bilenko). |
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11 | - add throw() to all libev functions that cannot throw exceptions, for |
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12 | further code size decrease when compiling for C++. |
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13 | - add throw () to callbacks that must not throw exceptions (allocator, |
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14 | syserr, loop acquire/release, periodic reschedule cbs). |
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15 | - fix event_base_loop return code, add event_get_callback, event_base_new, |
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16 | event_base_get_method calls to improve libevent 1.x emulation and add |
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17 | some libevent 2.x funcitonality (based on a patch by Jeff Davey). |
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18 | - add more memory fences to fix a bug reported by Jeff Davey. Better |
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19 | be overfenced than underprotected. |
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20 | - ev_run now returns a boolean status (true meaning watchers are |
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21 | still active). |
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22 | - ev_once: undef EV_ERROR in ev_kqueue.c, to avoid clashing with |
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23 | libev's EV_ERROR (reported by 191919). |
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24 | - (ecb) add memory fence support for xlC (Darin McBride). |
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25 | - (ecb) add memory fence support for gcc-mips (Anton Kirilov). |
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26 | - (ecb) add memory fence support for gcc-alpha (Christian Weisgerber). |
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27 | - work around some kernels losing file descriptors by leaking |
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28 | the kqueue descriptor in the child. |
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29 | - include sys/syscall.h instead of plain syscall.h. |
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30 | - check for io watcher loops in ev_verify, check for the most |
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31 | common reported usage bug in ev_io_start. |
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32 | |
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33 | 4.11 Sat Feb 4 19:52:39 CET 2012 |
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34 | - INCOMPATIBLE CHANGE: ev_timer_again now clears the pending status, as |
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35 | was documented already, but not implemented in the repeating case. |
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36 | - new compiletime symbols: EV_NO_SMP and EV_NO_THREADS. |
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37 | - fix a race where the workaround against the epoll fork bugs |
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38 | caused signals to not be handled anymore. |
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39 | - correct backend_fudge for most backends, and implement a windows |
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40 | specific workaround to avoid looping because we call both |
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41 | select and Sleep, both with different time resolutions. |
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42 | - document range and guarantees of ev_sleep. |
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43 | - document reasonable ranges for periodics interval and offset. |
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44 | - rename backend_fudge to backend_mintime to avoid future confusion :) |
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45 | - change the default periodic reschedule function to hopefully be more |
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46 | exact and correct even in corner cases or in the far future. |
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47 | - do not rely on -lm anymore: use it when available but use our |
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48 | own floor () if it is missing. This should make it easier to embed, |
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49 | as no external libraries are required. |
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50 | - strategically import macros from libecb and mark rarely-used functions |
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51 | as cache-cold (saving almost 2k code size on typical amd64 setups). |
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52 | - add Symbols.ev and Symbols.event files, that were missing. |
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53 | - fix backend_mintime value for epoll (was 1/1024, is 1/1000 now). |
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54 | - fix #3 "be smart about timeouts" to not "deadlock" when |
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55 | timeout == now, also improve the section overall. |
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56 | - avoid "AVOIDING FINISHING BEFORE RETURNING" idiom. |
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57 | - support new EV_API_STATIC mode to make all libev symbols |
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58 | static. |
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59 | - supply default CFLAGS of -g -O3 with gcc when original CFLAGS |
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60 | were empty. |
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61 | |
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62 | 4.04 Wed Feb 16 09:01:51 CET 2011 |
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63 | - fix two problems in the native win32 backend, where reuse of fd's |
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64 | with different underlying handles caused handles not to be removed |
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65 | or added to the select set (analyzed and tested by Bert Belder). |
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66 | - do no rely on ceil() in ev_e?poll.c. |
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67 | - backport libev to HP-UX versions before 11 v3. |
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68 | - configure did not detect nanosleep and clock_gettime properly when |
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69 | they are available in the libc (as opposed to -lrt). |
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70 | |
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71 | 4.03 Tue Jan 11 14:37:25 CET 2011 |
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72 | - officially support polling files with all backends. |
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73 | - support files, /dev/zero etc. the same way as select in the epoll |
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74 | backend, by generating events on our own. |
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75 | - ports backend: work around solaris bug 6874410 and many related ones |
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76 | (EINTR, maybe more), with no performance loss (note that the solaris |
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77 | bug report is actually wrong, reality is far more bizarre and broken |
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78 | than that). |
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79 | - define EV_READ/EV_WRITE as macros in event.h, as some programs use |
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80 | #ifdef to test for them. |
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81 | - new (experimental) function: ev_feed_signal. |
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82 | - new (to become default) EVFLAG_NOSIGMASK flag. |
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83 | - new EVBACKEND_MASK symbol. |
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84 | - updated COMMON IDIOMS SECTION. |
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85 | |
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86 | 4.01 Fri Nov 5 21:51:29 CET 2010 |
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87 | - automake fucked it up, apparently, --add-missing -f is not quite enough |
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88 | to make it update its files, so 4.00 didn't install ev++.h and |
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89 | event.h on make install. grrr. |
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90 | - ev_loop(count|depth) didn't return anything (Robin Haberkorn). |
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91 | - change EV_UNDEF to 0xffffffff to silence some overzealous compilers. |
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92 | - use "(libev) " prefix for all libev error messages now. |
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93 | |
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94 | 4.00 Mon Oct 25 12:32:12 CEST 2010 |
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95 | - "PORTING FROM LIBEV 3.X TO 4.X" (in ev.pod) is recommended reading. |
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96 | - ev_embed_stop did not correctly stop the watcher (very good |
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97 | testcase by Vladimir Timofeev). |
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98 | - ev_run will now always update the current loop time - it erroneously |
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99 | didn't when idle watchers were active, causing timers not to fire. |
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100 | - fix a bug where a timeout of zero caused the timer not to fire |
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101 | in the libevent emulation (testcase by Péter Szabó). |
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102 | - applied win32 fixes by Michael Lenaghan (also James Mansion). |
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103 | - replace EV_MINIMAL by EV_FEATURES. |
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104 | - prefer EPOLL_CTL_ADD over EPOLL_CTL_MOD in some more cases, as it |
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105 | seems the former is *much* faster than the latter. |
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106 | - linux kernel version detection (for inotify bug workarounds) |
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107 | did not work properly. |
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108 | - reduce the number of spurious wake-ups with the ports backend. |
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109 | - remove dependency on sys/queue.h on freebsd (patch by Vanilla Hsu). |
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110 | - do async init within ev_async_start, not ev_async_set, which avoids |
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111 | an API quirk where the set function must be called in the C++ API |
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112 | even when there is nothing to set. |
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113 | - add (undocumented) EV_ENABLE when adding events with kqueue, |
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114 | this might help with OS X, which seems to need it despite documenting |
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115 | not to need it (helpfully pointed out by Tilghman Lesher). |
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116 | - do not use poll by default on freebsd, it's broken (what isn't |
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117 | on freebsd...). |
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118 | - allow to embed epoll on kernels >= 2.6.32. |
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119 | - configure now prepends -O3, not appends it, so one can still |
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120 | override it. |
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121 | - ev.pod: greatly expanded the portability section, added a porting |
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122 | section, a description of watcher states and made lots of minor fixes. |
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123 | - disable poll backend on AIX, the poll header spams the namespace |
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124 | and it's not worth working around dead platforms (reported |
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125 | and analyzed by Aivars Kalvans). |
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126 | - improve header file compatibility of the standalone eventfd code |
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127 | in an obscure case. |
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128 | - implement EV_AVOID_STDIO option. |
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129 | - do not use sscanf to parse linux version number (smaller, faster, |
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130 | no sscanf dependency). |
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131 | - new EV_CHILD_ENABLE and EV_SIGNAL_ENABLE configurable settings. |
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132 | - update libev.m4 HAVE_CLOCK_SYSCALL test for newer glibcs. |
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133 | - add section on accept() problems to the manpage. |
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134 | - rename EV_TIMEOUT to EV_TIMER. |
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135 | - rename ev_loop_count/depth/verify/loop/unloop. |
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136 | - remove ev_default_destroy and ev_default_fork. |
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137 | - switch to two-digit minor version. |
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138 | - work around an apparent gentoo compiler bug. |
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139 | - define _DARWIN_UNLIMITED_SELECT. just so. |
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140 | - use enum instead of #define for most constants. |
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141 | - improve compatibility to older C++ compilers. |
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142 | - (experimental) ev_run/ev_default_loop/ev_break/ev_loop_new have now |
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143 | default arguments when compiled as C++. |
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144 | - enable automake dependency tracking. |
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145 | - ev_loop_new no longer leaks memory when loop creation failed. |
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146 | - new ev_cleanup watcher type. |
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147 | |
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148 | 3.9 Thu Dec 31 07:59:59 CET 2009 |
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149 | - signalfd is no longer used by default and has to be requested |
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150 | explicitly - this means that easy to catch bugs become hard to |
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151 | catch race conditions, but the users have spoken. |
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152 | - point out the unspecified signal mask in the documentation, and |
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153 | that this is a race condition regardless of EV_SIGNALFD. |
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154 | - backport inotify code to C89. |
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155 | - inotify file descriptors could leak into child processes. |
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156 | - ev_stat watchers could keep an erroneous extra ref on the loop, |
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157 | preventing exit when unregistering all watchers (testcases |
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158 | provided by ry@tinyclouds.org). |
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159 | - implement EV_WIN32_HANDLE_TO_FD and EV_WIN32_CLOSE_FD configuration |
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160 | symbols to make it easier for apps to do their own fd management. |
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161 | - support EV_IDLE_ENABLE being disabled in ev++.h |
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162 | (patch by Didier Spezia). |
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163 | - take advantage of inotify_init1, if available, to set cloexec/nonblock |
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164 | on fd creation, to avoid races. |
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165 | - the signal handling pipe wasn't always initialised under windows |
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166 | (analysed by lekma). |
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167 | - changed minimum glibc requirement from glibc 2.9 to 2.7, for |
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168 | signalfd. |
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169 | - add missing string.h include (Denis F. Latypoff). |
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170 | - only replace ev_stat.prev when we detect an actual difference, |
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171 | so prev is (almost) always different to attr. this might |
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172 | have caused the problems with 04_stat.t. |
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173 | - add ev::timer->remaining () method to C++ API. |
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174 | |
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175 | 3.8 Sun Aug 9 14:30:45 CEST 2009 |
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176 | - incompatible change: do not necessarily reset signal handler |
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177 | to SIG_DFL when a sighandler is stopped. |
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178 | - ev_default_destroy did not properly free or zero some members, |
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179 | potentially causing crashes and memory corruption on repeated |
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180 | ev_default_destroy/ev_default_loop calls. |
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181 | - take advantage of signalfd on GNU/Linux systems. |
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182 | - document that the signal mask might be in an unspecified |
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183 | state when using libev's signal handling. |
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184 | - take advantage of some GNU/Linux calls to set cloexec/nonblock |
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185 | on fd creation, to avoid race conditions. |
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186 | |
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187 | 3.7 Fri Jul 17 16:36:32 CEST 2009 |
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188 | - ev_unloop and ev_loop wrongly used a global variable to exit loops, |
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189 | instead of using a per-loop variable (bug caught by accident...). |
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190 | - the ev_set_io_collect_interval interpretation has changed. |
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191 | - add new functionality: ev_set_userdata, ev_userdata, |
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192 | ev_set_invoke_pending_cb, ev_set_loop_release_cb, |
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193 | ev_invoke_pending, ev_pending_count, together with a long example |
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194 | about thread locking. |
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195 | - add ev_timer_remaining (as requested by Denis F. Latypoff). |
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196 | - add ev_loop_depth. |
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197 | - calling ev_unloop in fork/prepare watchers will no longer poll |
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198 | for new events. |
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199 | - Denis F. Latypoff corrected many typos in example code snippets. |
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200 | - honor autoconf detection of EV_USE_CLOCK_SYSCALL, also double- |
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201 | check that the syscall number is available before trying to |
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202 | use it (reported by ry@tinyclouds). |
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203 | - use GetSystemTimeAsFileTime instead of _timeb on windows, for |
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204 | slightly higher accuracy. |
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205 | - properly declare ev_loop_verify and ev_now_update even when |
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206 | !EV_MULTIPLICITY. |
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207 | - do not compile in any priority code when EV_MAXPRI == EV_MINPRI. |
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208 | - support EV_MINIMAL==2 for a reduced API. |
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209 | - actually 0-initialise struct sigaction when installing signals. |
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210 | - add section on hibernate and stopped processes to ev_timer docs. |
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211 | |
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212 | 3.6 Tue Apr 28 02:49:30 CEST 2009 |
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213 | - multiple timers becoming ready within an event loop iteration |
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214 | will be invoked in the "correct" order now. |
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215 | - do not leave the event loop early just because we have no active |
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216 | watchers, fixing a problem when embedding a kqueue loop |
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217 | that has active kernel events but no registered watchers |
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218 | (reported by blacksand blacksand). |
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219 | - correctly zero the idx values for arrays, so destroying and |
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220 | reinitialising the default loop actually works (patch by |
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221 | Malek Hadj-Ali). |
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222 | - implement ev_suspend and ev_resume. |
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223 | - new EV_CUSTOM revents flag for use by applications. |
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224 | - add documentation section about priorities. |
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225 | - add a glossary to the dcoumentation. |
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226 | - extend the ev_fork description slightly. |
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227 | - optimize a jump out of call_pending. |
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228 | |
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229 | 3.53 Sun Feb 15 02:38:20 CET 2009 |
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230 | - fix a bug in event pipe creation on win32 that would cause a |
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231 | failed assertion on event loop creation (patch by Malek Hadj-Ali). |
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232 | - probe for CLOCK_REALTIME support at runtime as well and fall |
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233 | back to gettimeofday if there is an error, to support older |
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234 | operating systems with newer header files/libraries. |
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235 | - prefer gettimeofday over clock_gettime with USE_CLOCK_SYSCALL |
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236 | (default most everywhere), otherwise not. |
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237 | |
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238 | 3.52 Wed Jan 7 21:43:02 CET 2009 |
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239 | - fix compilation of select backend in fd_set mode when NFDBITS is |
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240 | missing (to get it to compile on QNX, reported by Rodrigo Campos). |
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241 | - better select-nfds handling when select backend is in fd_set mode. |
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242 | - diagnose fd_set overruns when select backend is in fd_set mode. |
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243 | - due to a thinko, instead of disabling everything but |
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244 | select on the borked OS X platform, everything but select was |
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245 | allowed (reported by Emanuele Giaquinta). |
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246 | - actually verify that local and remote port are matching in |
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247 | libev's socketpair emulation, which makes denial-of-service |
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248 | attacks harder (but not impossible - it's windows). Make sure |
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249 | it even works under vista, which thinks that getpeer/sockname |
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250 | should return fantasy port numbers. |
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251 | - include "libev" in all assertion messages for potentially |
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252 | clearer diagnostics. |
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253 | - event_get_version (libevent compatibility) returned |
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254 | a useless string instead of the expected version string |
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255 | (patch by W.C.A. Wijngaards). |
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256 | |
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257 | 3.51 Wed Dec 24 23:00:11 CET 2008 |
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258 | - fix a bug where an inotify watcher was added twice, causing |
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259 | freezes on hash collisions (reported and analysed by Graham Leggett). |
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260 | - new config symbol, EV_USE_CLOCK_SYSCALL, to make libev use |
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261 | a direct syscall - slower, but no dependency on librt et al. |
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262 | - assume negative return values != -1 signals success of port_getn |
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263 | (http://cvs.epicsol.org/cgi/viewcvs.cgi/epic5/source/newio.c?rev=1.52) |
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264 | (no known failure reports, but it doesn't hurt). |
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265 | - fork detection in ev_embed now stops and restarts the watcher |
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266 | automatically. |
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267 | - EXPERIMENTAL: default the method to operator () in ev++.h, |
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268 | to make it nicer to use functors (requested by Benedek László). |
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269 | - fixed const object callbacks in ev++.h. |
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270 | - replaced loop_ref argument of watcher.set (loop) by a direct |
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271 | ev_loop * in ev++.h, to avoid clashes with functor patch. |
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272 | - do not try to watch the empty string via inotify. |
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273 | - inotify watchers could be leaked under certain circumstances. |
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274 | - OS X 10.5 is actually even more broken than earlier versions, |
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275 | so fall back to select on that piece of garbage. |
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276 | - fixed some weirdness in the ev_embed documentation. |
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277 | |
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278 | 3.49 Wed Nov 19 11:26:53 CET 2008 |
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279 | - ev_stat watchers will now use inotify as a mere hint on |
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280 | kernels <2.6.25, or if the filesystem is not in the |
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281 | "known to be good" list. |
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282 | - better mingw32 compatibility (it's not as borked as native win32) |
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283 | (analysed by Roger Pack). |
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284 | - include stdio.h in the example program, as too many people are |
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285 | confused by the weird C language otherwise. I guess the next thing |
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286 | I get told is that the "..." ellipses in the examples don't compile |
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287 | with their C compiler. |
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288 | |
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289 | 3.48 Thu Oct 30 09:02:37 CET 2008 |
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290 | - further optimise away the EPOLL_CTL_ADD/MOD combo in the epoll |
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291 | backend by assuming the kernel event mask hasn't changed if |
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292 | ADD fails with EEXIST. |
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293 | - work around spurious event notification bugs in epoll by using |
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294 | a 32-bit generation counter. recreate kernel state if we receive |
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295 | spurious notifications or unwanted events. this is very costly, |
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296 | but I didn't come up with this horrible design. |
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297 | - use memset to initialise most arrays now and do away with the |
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298 | init functions. |
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299 | - expand time-out strategies into a "Be smart about timeouts" section. |
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300 | - drop the "struct" from all ev_watcher declarations in the |
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301 | documentation and did other clarifications (yeah, it was a mistake |
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302 | to have a struct AND a function called ev_loop). |
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303 | - fix a bug where ev_default would not initialise the default |
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304 | loop again after it was destroyed with ev_default_destroy. |
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305 | - rename syserr to ev_syserr to avoid name clashes when embedding, |
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306 | do similar changes for event.c. |
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307 | |
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308 | 3.45 Tue Oct 21 21:59:26 CEST 2008 |
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309 | - disable inotify usage on linux <2.6.25, as it is broken |
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310 | (reported by Yoann Vandoorselaere). |
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311 | - ev_stat erroneously would try to add inotify watchers |
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312 | even when inotify wasn't available (this should only |
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313 | have a performance impact). |
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314 | - ev_once now passes both timeout and io to the callback if both |
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315 | occur concurrently, instead of giving timeouts precedence. |
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316 | - disable EV_USE_INOTIFY when sys/inotify.h is too old. |
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317 | |
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318 | 3.44 Mon Sep 29 05:18:39 CEST 2008 |
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319 | - embed watchers now automatically invoke ev_loop_fork on the |
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320 | embedded loop when the parent loop forks. |
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321 | - new function: ev_now_update (loop). |
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322 | - verify_watcher was not marked static. |
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323 | - improve the "associating..." manpage section. |
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324 | - documentation tweaks here and there. |
| 2 | |
325 | |
| 3 | 3.43 Sun Jul 6 05:34:41 CEST 2008 |
326 | 3.43 Sun Jul 6 05:34:41 CEST 2008 |
| 4 | - include more include files on windows to get struct _stati64 |
327 | - include more include files on windows to get struct _stati64 |
| 5 | (reported by Chris Hulbert, but doesn't quite fix his issue). |
328 | (reported by Chris Hulbert, but doesn't quite fix his issue). |
| 6 | - add missing #include <io.h> in ev.c on windows (reported by |
329 | - add missing #include <io.h> in ev.c on windows (reported by |
| … | |
… | |
| 61 | - enable inlining with gcc versions 2 and 3. |
384 | - enable inlining with gcc versions 2 and 3. |
| 62 | - work around broken poll implementations potentially |
385 | - work around broken poll implementations potentially |
| 63 | not clearing revents field in ev_poll (Brandon Black) |
386 | not clearing revents field in ev_poll (Brandon Black) |
| 64 | (no such systems are known at this time). |
387 | (no such systems are known at this time). |
| 65 | - work around a bug in realloc on openbsd and darwin, |
388 | - work around a bug in realloc on openbsd and darwin, |
| 66 | also makes the errornous valgrind complaints |
389 | also makes the erroneous valgrind complaints |
| 67 | go away (noted by various people). |
390 | go away (noted by various people). |
| 68 | - fix ev_async_pending, add c++ wrapper for ev_async |
391 | - fix ev_async_pending, add c++ wrapper for ev_async |
| 69 | (based on patch sent by Johannes Deisenhofer. |
392 | (based on patch sent by Johannes Deisenhofer). |
| 70 | - add sensible set method to ev::embed. |
393 | - add sensible set method to ev::embed. |
| 71 | - made integer constants type int in ev.h. |
394 | - made integer constants type int in ev.h. |
| 72 | |
395 | |
| 73 | 3.2 Wed Apr 2 17:11:19 CEST 2008 |
396 | 3.2 Wed Apr 2 17:11:19 CEST 2008 |
| 74 | - fix a 64 bit overflow issue in the select backend, |
397 | - fix a 64 bit overflow issue in the select backend, |
