| 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_prefork hint? |
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4 | TODO: ev_loop_wakeup |
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5 | TODO: confusion about threads ongiong |
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6 | |
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7 | - change the default periodic reschedule function to hopefully be more |
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8 | exact and correct even in corner cases or in the far future. |
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9 | - document reasonable ranges for interval and offset. |
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10 | - do not rely on -lm anymore: use it when available but use our |
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11 | own floor () if it is missing. This should make it easier to embed. |
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12 | |
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13 | 4.04 Wed Feb 16 09:01:51 CET 2011 |
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14 | - fix two problems in the native win32 backend, where reuse of fd's |
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15 | with different underlying handles caused handles not to be removed |
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16 | or added to the select set (analyzed and tested by Bert Belder). |
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17 | - do no rely on ceil() in ev_e?poll.c. |
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18 | - backport libev to HP-UX versions before 11 v3. |
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19 | - configure did not detect nanosleep and clock_gettime properly when |
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20 | they are available in the libc (as opposed to -lrt). |
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21 | |
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22 | 4.03 Tue Jan 11 14:37:25 CET 2011 |
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23 | - officially support polling files with all backends. |
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24 | - support files, /dev/zero etc. the same way as select in the epoll |
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25 | backend, by generating events on our own. |
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26 | - ports backend: work around solaris bug 6874410 and many related ones |
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27 | (EINTR, maybe more), with no performance loss (note that the solaris |
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28 | bug report is actually wrong, reality is far more bizarre and broken |
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29 | than that). |
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30 | - define EV_READ/EV_WRITE as macros in event.h, as some programs use |
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31 | #ifdef to test for them. |
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32 | - new (experimental) function: ev_feed_signal. |
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33 | - new (to become default) EVFLAG_NOSIGMASK flag. |
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34 | - new EVBACKEND_MASK symbol. |
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35 | - updated COMMON IDIOMS SECTION. |
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36 | |
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37 | 4.01 Fri Nov 5 21:51:29 CET 2010 |
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38 | - automake fucked it up, apparently, --add-missing -f is not quite enough |
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39 | to make it update its files, so 4.00 didn't install ev++.h and |
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40 | event.h on make install. grrr. |
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41 | - ev_loop(count|depth) didn't return anything (Robin Haberkorn). |
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42 | - change EV_UNDEF to 0xffffffff to silence some overzealous compilers. |
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43 | - use "(libev) " prefix for all libev error messages now. |
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44 | |
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45 | 4.00 Mon Oct 25 12:32:12 CEST 2010 |
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46 | - "PORTING FROM LIBEV 3.X TO 4.X" (in ev.pod) is recommended reading. |
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47 | - ev_embed_stop did not correctly stop the watcher (very good |
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48 | testcase by Vladimir Timofeev). |
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49 | - ev_run will now always update the current loop time - it erroneously |
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50 | didn't when idle watchers were active, causing timers not to fire. |
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51 | - fix a bug where a timeout of zero caused the timer not to fire |
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52 | in the libevent emulation (testcase by Péter Szabó). |
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53 | - applied win32 fixes by Michael Lenaghan (also James Mansion). |
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54 | - replace EV_MINIMAL by EV_FEATURES. |
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55 | - prefer EPOLL_CTL_ADD over EPOLL_CTL_MOD in some more cases, as it |
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56 | seems the former is *much* faster than the latter. |
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57 | - linux kernel version detection (for inotify bug workarounds) |
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58 | did not work properly. |
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59 | - reduce the number of spurious wake-ups with the ports backend. |
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60 | - remove dependency on sys/queue.h on freebsd (patch by Vanilla Hsu). |
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61 | - do async init within ev_async_start, not ev_async_set, which avoids |
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62 | an API quirk where the set function must be called in the C++ API |
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63 | even when there is nothing to set. |
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64 | - add (undocumented) EV_ENABLE when adding events with kqueue, |
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65 | this might help with OS X, which seems to need it despite documenting |
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66 | not to need it (helpfully pointed out by Tilghman Lesher). |
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67 | - do not use poll by default on freebsd, it's broken (what isn't |
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68 | on freebsd...). |
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69 | - allow to embed epoll on kernels >= 2.6.32. |
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70 | - configure now prepends -O3, not appends it, so one can still |
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71 | override it. |
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72 | - ev.pod: greatly expanded the portability section, added a porting |
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73 | section, a description of watcher states and made lots of minor fixes. |
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74 | - disable poll backend on AIX, the poll header spams the namespace |
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75 | and it's not worth working around dead platforms (reported |
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76 | and analyzed by Aivars Kalvans). |
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77 | - improve header file compatibility of the standalone eventfd code |
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78 | in an obscure case. |
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79 | - implement EV_AVOID_STDIO option. |
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80 | - do not use sscanf to parse linux version number (smaller, faster, |
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81 | no sscanf dependency). |
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82 | - new EV_CHILD_ENABLE and EV_SIGNAL_ENABLE configurable settings. |
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83 | - update libev.m4 HAVE_CLOCK_SYSCALL test for newer glibcs. |
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84 | - add section on accept() problems to the manpage. |
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85 | - rename EV_TIMEOUT to EV_TIMER. |
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86 | - rename ev_loop_count/depth/verify/loop/unloop. |
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87 | - remove ev_default_destroy and ev_default_fork. |
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88 | - switch to two-digit minor version. |
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89 | - work around an apparent gentoo compiler bug. |
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90 | - define _DARWIN_UNLIMITED_SELECT. just so. |
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91 | - use enum instead of #define for most constants. |
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92 | - improve compatibility to older C++ compilers. |
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93 | - (experimental) ev_run/ev_default_loop/ev_break/ev_loop_new have now |
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94 | default arguments when compiled as C++. |
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95 | - enable automake dependency tracking. |
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96 | - ev_loop_new no longer leaks memory when loop creation failed. |
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97 | - new ev_cleanup watcher type. |
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98 | |
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99 | 3.9 Thu Dec 31 07:59:59 CET 2009 |
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100 | - signalfd is no longer used by default and has to be requested |
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101 | explicitly - this means that easy to catch bugs become hard to |
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102 | catch race conditions, but the users have spoken. |
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103 | - point out the unspecified signal mask in the documentation, and |
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104 | that this is a race condition regardless of EV_SIGNALFD. |
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105 | - backport inotify code to C89. |
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106 | - inotify file descriptors could leak into child processes. |
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107 | - ev_stat watchers could keep an errornous extra ref on the loop, |
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108 | preventing exit when unregistering all watchers (testcases |
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109 | provided by ry@tinyclouds.org). |
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110 | - implement EV_WIN32_HANDLE_TO_FD and EV_WIN32_CLOSE_FD configuration |
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111 | symbols to make it easier for apps to do their own fd management. |
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112 | - support EV_IDLE_ENABLE being disabled in ev++.h |
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113 | (patch by Didier Spezia). |
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114 | - take advantage of inotify_init1, if available, to set cloexec/nonblock |
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115 | on fd creation, to avoid races. |
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116 | - the signal handling pipe wasn't always initialised under windows |
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117 | (analysed by lekma). |
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118 | - changed minimum glibc requirement from glibc 2.9 to 2.7, for |
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119 | signalfd. |
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120 | - add missing string.h include (Denis F. Latypoff). |
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121 | - only replace ev_stat.prev when we detect an actual difference, |
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122 | so prev is (almost) always different to attr. this might |
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123 | have caused the problems with 04_stat.t. |
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124 | - add ev::timer->remaining () method to C++ API. |
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125 | |
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126 | 3.8 Sun Aug 9 14:30:45 CEST 2009 |
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127 | - incompatible change: do not necessarily reset signal handler |
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128 | to SIG_DFL when a sighandler is stopped. |
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129 | - ev_default_destroy did not properly free or zero some members, |
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130 | potentially causing crashes and memory corruption on repeated |
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131 | ev_default_destroy/ev_default_loop calls. |
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132 | - take advantage of signalfd on GNU/Linux systems. |
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133 | - document that the signal mask might be in an unspecified |
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134 | state when using libev's signal handling. |
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135 | - take advantage of some GNU/Linux calls to set cloexec/nonblock |
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136 | on fd creation, to avoid race conditions. |
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137 | |
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138 | 3.7 Fri Jul 17 16:36:32 CEST 2009 |
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139 | - ev_unloop and ev_loop wrongly used a global variable to exit loops, |
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140 | instead of using a per-loop variable (bug caught by accident...). |
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141 | - the ev_set_io_collect_interval interpretation has changed. |
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142 | - add new functionality: ev_set_userdata, ev_userdata, |
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143 | ev_set_invoke_pending_cb, ev_set_loop_release_cb, |
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144 | ev_invoke_pending, ev_pending_count, together with a long example |
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145 | about thread locking. |
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146 | - add ev_timer_remaining (as requested by Denis F. Latypoff). |
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147 | - add ev_loop_depth. |
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148 | - calling ev_unloop in fork/prepare watchers will no longer poll |
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149 | for new events. |
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150 | - Denis F. Latypoff corrected many typos in example code snippets. |
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151 | - honor autoconf detection of EV_USE_CLOCK_SYSCALL, also double- |
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152 | check that the syscall number is available before trying to |
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153 | use it (reported by ry@tinyclouds). |
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154 | - use GetSystemTimeAsFileTime instead of _timeb on windows, for |
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155 | slightly higher accuracy. |
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156 | - properly declare ev_loop_verify and ev_now_update even when |
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157 | !EV_MULTIPLICITY. |
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158 | - do not compile in any priority code when EV_MAXPRI == EV_MINPRI. |
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159 | - support EV_MINIMAL==2 for a reduced API. |
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160 | - actually 0-initialise struct sigaction when installing signals. |
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161 | - add section on hibernate and stopped processes to ev_timer docs. |
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162 | |
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163 | 3.6 Tue Apr 28 02:49:30 CEST 2009 |
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164 | - multiple timers becoming ready within an event loop iteration |
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165 | will be invoked in the "correct" order now. |
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166 | - do not leave the event loop early just because we have no active |
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167 | watchers, fixing a problem when embedding a kqueue loop |
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168 | that has active kernel events but no registered watchers |
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169 | (reported by blacksand blacksand). |
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170 | - correctly zero the idx values for arrays, so destroying and |
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171 | reinitialising the default loop actually works (patch by |
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172 | Malek Hadj-Ali). |
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173 | - implement ev_suspend and ev_resume. |
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174 | - new EV_CUSTOM revents flag for use by applications. |
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175 | - add documentation section about priorites. |
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176 | - add a glossary to the dcoumentation. |
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177 | - extend the ev_fork description slightly. |
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178 | - optimize a jump out of call_pending. |
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179 | |
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180 | 3.53 Sun Feb 15 02:38:20 CET 2009 |
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181 | - fix a bug in event pipe creation on win32 that would cause a |
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182 | failed assertion on event loop creation (patch by Malek Hadj-Ali). |
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183 | - probe for CLOCK_REALTIME support at runtime as well and fall |
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184 | back to gettimeofday if there is an error, to support older |
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185 | operating systems with newer header files/libraries. |
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186 | - prefer gettimeofday over clock_gettime with USE_CLOCK_SYSCALL |
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187 | (default most everywhere), otherwise not. |
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188 | |
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189 | 3.52 Wed Jan 7 21:43:02 CET 2009 |
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190 | - fix compilation of select backend in fd_set mode when NFDBITS is |
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191 | missing (to get it to compile on QNX, reported by Rodrigo Campos). |
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192 | - better select-nfds handling when select backend is in fd_set mode. |
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193 | - diagnose fd_set overruns when select backend is in fd_set mode. |
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194 | - due to a thinko, instead of disabling everything but |
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195 | select on the borked OS X platform, everything but select was |
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196 | allowed (reported by Emanuele Giaquinta). |
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197 | - actually verify that local and remote port are matching in |
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198 | libev's socketpair emulation, which makes denial-of-service |
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199 | attacks harder (but not impossible - it's windows). Make sure |
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200 | it even works under vista, which thinks that getpeer/sockname |
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201 | should return fantasy port numbers. |
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202 | - include "libev" in all assertion messages for potentially |
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203 | clearer diagnostics. |
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204 | - event_get_version (libevent compatibility) returned |
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205 | a useless string instead of the expected version string |
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206 | (patch by W.C.A. Wijngaards). |
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207 | |
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208 | 3.51 Wed Dec 24 23:00:11 CET 2008 |
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209 | - fix a bug where an inotify watcher was added twice, causing |
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210 | freezes on hash collisions (reported and analysed by Graham Leggett). |
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211 | - new config symbol, EV_USE_CLOCK_SYSCALL, to make libev use |
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212 | a direct syscall - slower, but no dependency on librt et al. |
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213 | - assume negative return values != -1 signals success of port_getn |
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214 | (http://cvs.epicsol.org/cgi/viewcvs.cgi/epic5/source/newio.c?rev=1.52) |
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215 | (no known failure reports, but it doesn't hurt). |
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216 | - fork detection in ev_embed now stops and restarts the watcher |
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217 | automatically. |
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218 | - EXPERIMENTAL: default the method to operator () in ev++.h, |
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219 | to make it nicer to use functors (requested by Benedek László). |
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220 | - fixed const object callbacks in ev++.h. |
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221 | - replaced loop_ref argument of watcher.set (loop) by a direct |
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222 | ev_loop * in ev++.h, to avoid clashes with functor patch. |
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223 | - do not try to watch the empty string via inotify. |
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224 | - inotify watchers could be leaked under certain circumstances. |
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225 | - OS X 10.5 is actually even more broken than earlier versions, |
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226 | so fall back to select on that piece of garbage. |
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227 | - fixed some weirdness in the ev_embed documentation. |
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228 | |
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229 | 3.49 Wed Nov 19 11:26:53 CET 2008 |
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230 | - ev_stat watchers will now use inotify as a mere hint on |
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231 | kernels <2.6.25, or if the filesystem is not in the |
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232 | "known to be good" list. |
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233 | - better mingw32 compatibility (it's not as borked as native win32) |
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234 | (analysed by Roger Pack). |
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235 | - include stdio.h in the example program, as too many people are |
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236 | confused by the weird C language otherwise. I guess the next thing |
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237 | I get told is that the "..." ellipses in the examples don't compile |
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238 | with their C compiler. |
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239 | |
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240 | 3.48 Thu Oct 30 09:02:37 CET 2008 |
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241 | - further optimise away the EPOLL_CTL_ADD/MOD combo in the epoll |
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242 | backend by assuming the kernel event mask hasn't changed if |
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243 | ADD fails with EEXIST. |
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244 | - work around spurious event notification bugs in epoll by using |
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245 | a 32-bit generation counter. recreate kernel state if we receive |
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246 | spurious notifications or unwanted events. this is very costly, |
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247 | but I didn't come up with this horrible design. |
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248 | - use memset to initialise most arrays now and do away with the |
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249 | init functions. |
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250 | - expand time-out strategies into a "Be smart about timeouts" section. |
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251 | - drop the "struct" from all ev_watcher declarations in the |
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252 | documentation and did other clarifications (yeah, it was a mistake |
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253 | to have a struct AND a function called ev_loop). |
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254 | - fix a bug where ev_default would not initialise the default |
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255 | loop again after it was destroyed with ev_default_destroy. |
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256 | - rename syserr to ev_syserr to avoid name clashes when embedding, |
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257 | do similar changes for event.c. |
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258 | |
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259 | 3.45 Tue Oct 21 21:59:26 CEST 2008 |
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260 | - disable inotify usage on linux <2.6.25, as it is broken |
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261 | (reported by Yoann Vandoorselaere). |
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262 | - ev_stat erroneously would try to add inotify watchers |
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263 | even when inotify wasn't available (this should only |
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264 | have a performance impact). |
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265 | - ev_once now passes both timeout and io to the callback if both |
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266 | occur concurrently, instead of giving timeouts precedence. |
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267 | - disable EV_USE_INOTIFY when sys/inotify.h is too old. |
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268 | |
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269 | 3.44 Mon Sep 29 05:18:39 CEST 2008 |
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270 | - embed watchers now automatically invoke ev_loop_fork on the |
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271 | embedded loop when the parent loop forks. |
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272 | - new function: ev_now_update (loop). |
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273 | - verify_watcher was not marked static. |
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274 | - improve the "associating..." manpage section. |
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275 | - documentation tweaks here and there. |
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276 | |
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277 | 3.43 Sun Jul 6 05:34:41 CEST 2008 |
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278 | - include more include files on windows to get struct _stati64 |
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279 | (reported by Chris Hulbert, but doesn't quite fix his issue). |
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280 | - add missing #include <io.h> in ev.c on windows (reported by |
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281 | Matt Tolton). |
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282 | |
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283 | 3.42 Tue Jun 17 12:12:07 CEST 2008 |
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284 | - work around yet another windows bug: FD_SET actually adds fd's |
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285 | multiple times to the fd_*SET*, despite official MSN docs claiming |
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286 | otherwise. Reported and well-analysed by Matt Tolton. |
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287 | - define NFDBITS to 0 when EV_SELECT_IS_WINSOCKET to make it compile |
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288 | (reported any analysed by Chris Hulbert). |
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289 | - fix a bug in ev_ebadf (this function is only used to catch |
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290 | programming errors in the libev user). reported by Matt Tolton. |
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291 | - fix a bug in fd_intern on win32 (could lead to compile errors |
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292 | under some circumstances, but would work correctly if it compiles). |
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293 | reported by Matt Tolton. |
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294 | - (try to) work around missing lstat on windows. |
| 3 | - pass in the write fd set as except fd set under windows. windows |
295 | - pass in the write fd set as except fd set under windows. windows |
| 4 | is so uncontrollably lame that it requires this. this means that |
296 | is so uncontrollably lame that it requires this. this means that |
| 5 | switching off oobinline is not supported (but tcp/ip doesn't |
297 | switching off oobinline is not supported (but tcp/ip doesn't |
| 6 | have oob, so that would be stupid anyways. |
298 | have oob, so that would be stupid anyways. |
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299 | - use posix module symbol to auto-detect monotonic clock presence |
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300 | and some other default values. |
| 7 | |
301 | |
| 8 | 3.41 Fri May 23 18:42:54 CEST 2008 |
302 | 3.41 Fri May 23 18:42:54 CEST 2008 |
| 9 | - work around an obscure bug in winsocket select: if you |
303 | - work around an obscure bug in winsocket select: if you |
| 10 | provide only empty fd sets then select returns WSAEINVAL. how sucky. |
304 | provide only empty fd sets then select returns WSAEINVAL. how sucky. |
| 11 | - improve timer scheduling stability and reduce use of time_epsilon. |
305 | - improve timer scheduling stability and reduce use of time_epsilon. |
| … | |
… | |
| 41 | - enable inlining with gcc versions 2 and 3. |
335 | - enable inlining with gcc versions 2 and 3. |
| 42 | - work around broken poll implementations potentially |
336 | - work around broken poll implementations potentially |
| 43 | not clearing revents field in ev_poll (Brandon Black) |
337 | not clearing revents field in ev_poll (Brandon Black) |
| 44 | (no such systems are known at this time). |
338 | (no such systems are known at this time). |
| 45 | - work around a bug in realloc on openbsd and darwin, |
339 | - work around a bug in realloc on openbsd and darwin, |
| 46 | also makes the errornous valgrind complaints |
340 | also makes the erroneous valgrind complaints |
| 47 | go away (noted by various people). |
341 | go away (noted by various people). |
| 48 | - fix ev_async_pending, add c++ wrapper for ev_async |
342 | - fix ev_async_pending, add c++ wrapper for ev_async |
| 49 | (based on patch sent by Johannes Deisenhofer. |
343 | (based on patch sent by Johannes Deisenhofer). |
| 50 | - add sensible set method to ev::embed. |
344 | - add sensible set method to ev::embed. |
| 51 | - made integer constants type int in ev.h. |
345 | - made integer constants type int in ev.h. |
| 52 | |
346 | |
| 53 | 3.2 Wed Apr 2 17:11:19 CEST 2008 |
347 | 3.2 Wed Apr 2 17:11:19 CEST 2008 |
| 54 | - fix a 64 bit overflow issue in the select backend, |
348 | - fix a 64 bit overflow issue in the select backend, |
