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. |
2 | |
2 | |
3 | TODO: somehow unblock procmask? |
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 | TODO: faq, process a thing in each iteration |
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6 | TODO: dbeugging tips, ev_verify, ev_init twice |
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7 | TODO: ev_break for immediate exit (EVBREAK_NOW?) |
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8 | TODO: ev_feed_child_event |
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9 | TODO: document the special problem of signals around fork. |
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10 | TODO: store pid for each signal |
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11 | TODO: document file descriptor usage per loop |
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12 | TODO: store loop pid_t and compare isndie signal handler,store 1 for same, 2 for differign pid, clean up in loop_fork |
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13 | TODO: embed watchers need updating when fd changes |
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14 | TODO: document portbaility requirements for atomic pointer access |
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15 | |
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16 | 4.15 Fri Mar 1 12:04:50 CET 2013 |
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17 | - destroying a non-default loop would stop the global waitpid |
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18 | watcher (Denis Bilenko). |
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19 | - queueing pending watchers of higher priority from a watcher now invokes |
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20 | them in a timely fashion (reported by Denis Bilenko). |
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21 | - add throw() to all libev functions that cannot throw exceptions, for |
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22 | further code size decrease when compiling for C++. |
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23 | - add throw () to callbacks that must not throw exceptions (allocator, |
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24 | syserr, loop acquire/release, periodic reschedule cbs). |
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25 | - fix event_base_loop return code, add event_get_callback, event_base_new, |
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26 | event_base_get_method calls to improve libevent 1.x emulation and add |
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27 | some libevent 2.x functionality (based on a patch by Jeff Davey). |
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28 | - add more memory fences to fix a bug reported by Jeff Davey. Better |
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29 | be overfenced than underprotected. |
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30 | - ev_run now returns a boolean status (true meaning watchers are |
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31 | still active). |
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32 | - ev_once: undef EV_ERROR in ev_kqueue.c, to avoid clashing with |
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33 | libev's EV_ERROR (reported by 191919). |
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34 | - (ecb) add memory fence support for xlC (Darin McBride). |
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35 | - (ecb) add memory fence support for gcc-mips (Anton Kirilov). |
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36 | - (ecb) add memory fence support for gcc-alpha (Christian Weisgerber). |
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37 | - work around some kernels losing file descriptors by leaking |
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38 | the kqueue descriptor in the child. |
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39 | - work around linux inotify not reporting IN_ATTRIB changes for directories |
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40 | in many cases. |
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41 | - include sys/syscall.h instead of plain syscall.h. |
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42 | - check for io watcher loops in ev_verify, check for the most |
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43 | common reported usage bug in ev_io_start. |
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44 | - choose socket vs. WSASocket at compiletime using EV_USE_WSASOCKET. |
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45 | - always use WSASend/WSARecv directly on windows, hoping that this |
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46 | works in all cases (unlike read/write/send/recv...). |
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47 | - try to detect signals around a fork faster (test program by |
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48 | Denis Bilenko). |
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49 | - work around recent glibc versions that leak memory in realloc. |
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50 | - rename ev::embed::set to ev::embed::set_embed to avoid clashing |
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51 | the watcher base set (loop) method. |
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52 | - rewrite the async/signal pipe logic to always keep a valid fd, which |
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53 | simplifies (and hopefully correctifies :) the race checking |
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54 | on fork, at the cost of one extra fd. |
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55 | - add fat, msdos, jffs2, ramfs, ntfs and btrfs to the list of |
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56 | inotify-supporting filesystems. |
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57 | - move orig_CFLAGS assignment to after AC_INIT, as newer autoconf |
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58 | versions ignore it before |
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59 | (https://bugzilla.redhat.com/show_bug.cgi?id=908096). |
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60 | - add some untested android support. |
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61 | - enum expressions must be of type int (reported by Juan Pablo L). |
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62 | |
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63 | 4.11 Sat Feb 4 19:52:39 CET 2012 |
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64 | - INCOMPATIBLE CHANGE: ev_timer_again now clears the pending status, as |
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65 | was documented already, but not implemented in the repeating case. |
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66 | - new compiletime symbols: EV_NO_SMP and EV_NO_THREADS. |
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67 | - fix a race where the workaround against the epoll fork bugs |
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68 | caused signals to not be handled anymore. |
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69 | - correct backend_fudge for most backends, and implement a windows |
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70 | specific workaround to avoid looping because we call both |
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71 | select and Sleep, both with different time resolutions. |
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72 | - document range and guarantees of ev_sleep. |
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73 | - document reasonable ranges for periodics interval and offset. |
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74 | - rename backend_fudge to backend_mintime to avoid future confusion :) |
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75 | - change the default periodic reschedule function to hopefully be more |
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76 | exact and correct even in corner cases or in the far future. |
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77 | - do not rely on -lm anymore: use it when available but use our |
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78 | own floor () if it is missing. This should make it easier to embed, |
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79 | as no external libraries are required. |
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80 | - strategically import macros from libecb and mark rarely-used functions |
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81 | as cache-cold (saving almost 2k code size on typical amd64 setups). |
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82 | - add Symbols.ev and Symbols.event files, that were missing. |
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83 | - fix backend_mintime value for epoll (was 1/1024, is 1/1000 now). |
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84 | - fix #3 "be smart about timeouts" to not "deadlock" when |
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85 | timeout == now, also improve the section overall. |
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86 | - avoid "AVOIDING FINISHING BEFORE RETURNING" idiom. |
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87 | - support new EV_API_STATIC mode to make all libev symbols |
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88 | static. |
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89 | - supply default CFLAGS of -g -O3 with gcc when original CFLAGS |
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90 | were empty. |
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91 | |
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92 | 4.04 Wed Feb 16 09:01:51 CET 2011 |
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93 | - fix two problems in the native win32 backend, where reuse of fd's |
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94 | with different underlying handles caused handles not to be removed |
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95 | or added to the select set (analyzed and tested by Bert Belder). |
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96 | - do no rely on ceil() in ev_e?poll.c. |
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97 | - backport libev to HP-UX versions before 11 v3. |
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98 | - configure did not detect nanosleep and clock_gettime properly when |
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99 | they are available in the libc (as opposed to -lrt). |
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100 | |
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101 | 4.03 Tue Jan 11 14:37:25 CET 2011 |
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102 | - officially support polling files with all backends. |
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103 | - support files, /dev/zero etc. the same way as select in the epoll |
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104 | backend, by generating events on our own. |
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105 | - ports backend: work around solaris bug 6874410 and many related ones |
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106 | (EINTR, maybe more), with no performance loss (note that the solaris |
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107 | bug report is actually wrong, reality is far more bizarre and broken |
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108 | than that). |
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109 | - define EV_READ/EV_WRITE as macros in event.h, as some programs use |
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110 | #ifdef to test for them. |
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111 | - new (experimental) function: ev_feed_signal. |
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112 | - new (to become default) EVFLAG_NOSIGMASK flag. |
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113 | - new EVBACKEND_MASK symbol. |
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114 | - updated COMMON IDIOMS SECTION. |
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115 | |
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116 | 4.01 Fri Nov 5 21:51:29 CET 2010 |
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117 | - automake fucked it up, apparently, --add-missing -f is not quite enough |
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118 | to make it update its files, so 4.00 didn't install ev++.h and |
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119 | event.h on make install. grrr. |
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120 | - ev_loop(count|depth) didn't return anything (Robin Haberkorn). |
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121 | - change EV_UNDEF to 0xffffffff to silence some overzealous compilers. |
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122 | - use "(libev) " prefix for all libev error messages now. |
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123 | |
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124 | 4.00 Mon Oct 25 12:32:12 CEST 2010 |
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125 | - "PORTING FROM LIBEV 3.X TO 4.X" (in ev.pod) is recommended reading. |
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126 | - ev_embed_stop did not correctly stop the watcher (very good |
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127 | testcase by Vladimir Timofeev). |
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128 | - ev_run will now always update the current loop time - it erroneously |
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129 | didn't when idle watchers were active, causing timers not to fire. |
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130 | - fix a bug where a timeout of zero caused the timer not to fire |
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131 | in the libevent emulation (testcase by Péter Szabó). |
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132 | - applied win32 fixes by Michael Lenaghan (also James Mansion). |
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133 | - replace EV_MINIMAL by EV_FEATURES. |
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134 | - prefer EPOLL_CTL_ADD over EPOLL_CTL_MOD in some more cases, as it |
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135 | seems the former is *much* faster than the latter. |
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136 | - linux kernel version detection (for inotify bug workarounds) |
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137 | did not work properly. |
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138 | - reduce the number of spurious wake-ups with the ports backend. |
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139 | - remove dependency on sys/queue.h on freebsd (patch by Vanilla Hsu). |
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140 | - do async init within ev_async_start, not ev_async_set, which avoids |
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141 | an API quirk where the set function must be called in the C++ API |
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142 | even when there is nothing to set. |
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143 | - add (undocumented) EV_ENABLE when adding events with kqueue, |
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144 | this might help with OS X, which seems to need it despite documenting |
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145 | not to need it (helpfully pointed out by Tilghman Lesher). |
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146 | - do not use poll by default on freebsd, it's broken (what isn't |
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147 | on freebsd...). |
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148 | - allow to embed epoll on kernels >= 2.6.32. |
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149 | - configure now prepends -O3, not appends it, so one can still |
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150 | override it. |
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151 | - ev.pod: greatly expanded the portability section, added a porting |
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152 | section, a description of watcher states and made lots of minor fixes. |
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153 | - disable poll backend on AIX, the poll header spams the namespace |
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154 | and it's not worth working around dead platforms (reported |
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155 | and analyzed by Aivars Kalvans). |
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156 | - improve header file compatibility of the standalone eventfd code |
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157 | in an obscure case. |
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158 | - implement EV_AVOID_STDIO option. |
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159 | - do not use sscanf to parse linux version number (smaller, faster, |
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160 | no sscanf dependency). |
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161 | - new EV_CHILD_ENABLE and EV_SIGNAL_ENABLE configurable settings. |
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162 | - update libev.m4 HAVE_CLOCK_SYSCALL test for newer glibcs. |
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163 | - add section on accept() problems to the manpage. |
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164 | - rename EV_TIMEOUT to EV_TIMER. |
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165 | - rename ev_loop_count/depth/verify/loop/unloop. |
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166 | - remove ev_default_destroy and ev_default_fork. |
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167 | - switch to two-digit minor version. |
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168 | - work around an apparent gentoo compiler bug. |
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169 | - define _DARWIN_UNLIMITED_SELECT. just so. |
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170 | - use enum instead of #define for most constants. |
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171 | - improve compatibility to older C++ compilers. |
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172 | - (experimental) ev_run/ev_default_loop/ev_break/ev_loop_new have now |
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173 | default arguments when compiled as C++. |
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174 | - enable automake dependency tracking. |
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175 | - ev_loop_new no longer leaks memory when loop creation failed. |
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176 | - new ev_cleanup watcher type. |
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177 | |
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178 | 3.9 Thu Dec 31 07:59:59 CET 2009 |
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179 | - signalfd is no longer used by default and has to be requested |
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180 | explicitly - this means that easy to catch bugs become hard to |
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181 | catch race conditions, but the users have spoken. |
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182 | - point out the unspecified signal mask in the documentation, and |
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183 | that this is a race condition regardless of EV_SIGNALFD. |
4 | - backport inotify code to C89. |
184 | - backport inotify code to C89. |
5 | - inotify file descriptors could leak into child processes. |
185 | - inotify file descriptors could leak into child processes. |
6 | - ev_stat watchers could keep an errornous extra ref on the loop, |
186 | - ev_stat watchers could keep an erroneous extra ref on the loop, |
7 | preventing exit when unregistering all watchers (testcases |
187 | preventing exit when unregistering all watchers (testcases |
8 | provided by ry@tinyclouds.org). |
188 | provided by ry@tinyclouds.org). |
9 | - implement EV_WIN32_HANDLE_TO_FD and EV_WIN32_CLOSE_FD configuration |
189 | - implement EV_WIN32_HANDLE_TO_FD and EV_WIN32_CLOSE_FD configuration |
10 | symbols to make it easier for apps to do their own fd management. |
190 | symbols to make it easier for apps to do their own fd management. |
11 | - support EV_IDLE_ENABLE being disabled in ev++.h |
191 | - support EV_IDLE_ENABLE being disabled in ev++.h |
12 | (patch by Didier Spezia). |
192 | (patch by Didier Spezia). |
13 | - point out the unspecified signal mask in the documentation. |
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14 | - take advantage of inotify_init1, if available, to set cloexec/nonblock |
193 | - take advantage of inotify_init1, if available, to set cloexec/nonblock |
15 | on fd creation, to avoid races. |
194 | on fd creation, to avoid races. |
16 | - the signal handling pipe wasn't always initialised under windows |
195 | - the signal handling pipe wasn't always initialised under windows |
17 | (analysed by lekma). |
196 | (analysed by lekma). |
18 | - changed minimum glibc requirement from glibc 2.9 to 2.7, for |
197 | - changed minimum glibc requirement from glibc 2.9 to 2.7, for |
19 | signalfd. |
198 | signalfd. |
20 | - add missing string.h include (Denis F. Latypoff). |
199 | - add missing string.h include (Denis F. Latypoff). |
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200 | - only replace ev_stat.prev when we detect an actual difference, |
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201 | so prev is (almost) always different to attr. this might |
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202 | have caused the problems with 04_stat.t. |
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203 | - add ev::timer->remaining () method to C++ API. |
21 | |
204 | |
22 | 3.8 Sun Aug 9 14:30:45 CEST 2009 |
205 | 3.8 Sun Aug 9 14:30:45 CEST 2009 |
23 | - incompatible change: do not necessarily reset signal handler |
206 | - incompatible change: do not necessarily reset signal handler |
24 | to SIG_DFL when a sighandler is stopped. |
207 | to SIG_DFL when a sighandler is stopped. |
25 | - ev_default_destroy did not properly free or zero some members, |
208 | - ev_default_destroy did not properly free or zero some members, |
26 | potentially causing crashes and memory corruption on repated |
209 | potentially causing crashes and memory corruption on repeated |
27 | ev_default_destroy/ev_default_loop calls. |
210 | ev_default_destroy/ev_default_loop calls. |
28 | - take advantage of signalfd on GNU/Linux systems. |
211 | - take advantage of signalfd on GNU/Linux systems. |
29 | - document that the signal mask might be in an unspecified |
212 | - document that the signal mask might be in an unspecified |
30 | state when using libev's signal handling. |
213 | state when using libev's signal handling. |
31 | - take advantage of some GNU/Linux calls to set cloexec/nonblock |
214 | - take advantage of some GNU/Linux calls to set cloexec/nonblock |
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66 | - correctly zero the idx values for arrays, so destroying and |
249 | - correctly zero the idx values for arrays, so destroying and |
67 | reinitialising the default loop actually works (patch by |
250 | reinitialising the default loop actually works (patch by |
68 | Malek Hadj-Ali). |
251 | Malek Hadj-Ali). |
69 | - implement ev_suspend and ev_resume. |
252 | - implement ev_suspend and ev_resume. |
70 | - new EV_CUSTOM revents flag for use by applications. |
253 | - new EV_CUSTOM revents flag for use by applications. |
71 | - add documentation section about priorites. |
254 | - add documentation section about priorities. |
72 | - add a glossary to the dcoumentation. |
255 | - add a glossary to the documentation. |
73 | - extend the ev_fork description slightly. |
256 | - extend the ev_fork description slightly. |
74 | - optimize a jump out of call_pending. |
257 | - optimize a jump out of call_pending. |
75 | |
258 | |
76 | 3.53 Sun Feb 15 02:38:20 CET 2009 |
259 | 3.53 Sun Feb 15 02:38:20 CET 2009 |
77 | - fix a bug in event pipe creation on win32 that would cause a |
260 | - fix a bug in event pipe creation on win32 that would cause a |
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153 | do similar changes for event.c. |
336 | do similar changes for event.c. |
154 | |
337 | |
155 | 3.45 Tue Oct 21 21:59:26 CEST 2008 |
338 | 3.45 Tue Oct 21 21:59:26 CEST 2008 |
156 | - disable inotify usage on linux <2.6.25, as it is broken |
339 | - disable inotify usage on linux <2.6.25, as it is broken |
157 | (reported by Yoann Vandoorselaere). |
340 | (reported by Yoann Vandoorselaere). |
158 | - ev_stat errornously would try to add inotify watchers |
341 | - ev_stat erroneously would try to add inotify watchers |
159 | even when inotify wasn't available (this should only |
342 | even when inotify wasn't available (this should only |
160 | have a performance impact). |
343 | have a performance impact). |
161 | - ev_once now passes both timeout and io to the callback if both |
344 | - ev_once now passes both timeout and io to the callback if both |
162 | occur concurrently, instead of giving timeouts precedence. |
345 | occur concurrently, instead of giving timeouts precedence. |
163 | - disable EV_USE_INOTIFY when sys/inotify.h is too old. |
346 | - disable EV_USE_INOTIFY when sys/inotify.h is too old. |
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231 | - enable inlining with gcc versions 2 and 3. |
414 | - enable inlining with gcc versions 2 and 3. |
232 | - work around broken poll implementations potentially |
415 | - work around broken poll implementations potentially |
233 | not clearing revents field in ev_poll (Brandon Black) |
416 | not clearing revents field in ev_poll (Brandon Black) |
234 | (no such systems are known at this time). |
417 | (no such systems are known at this time). |
235 | - work around a bug in realloc on openbsd and darwin, |
418 | - work around a bug in realloc on openbsd and darwin, |
236 | also makes the errornous valgrind complaints |
419 | also makes the erroneous valgrind complaints |
237 | go away (noted by various people). |
420 | go away (noted by various people). |
238 | - fix ev_async_pending, add c++ wrapper for ev_async |
421 | - fix ev_async_pending, add c++ wrapper for ev_async |
239 | (based on patch sent by Johannes Deisenhofer. |
422 | (based on patch sent by Johannes Deisenhofer). |
240 | - add sensible set method to ev::embed. |
423 | - add sensible set method to ev::embed. |
241 | - made integer constants type int in ev.h. |
424 | - made integer constants type int in ev.h. |
242 | |
425 | |
243 | 3.2 Wed Apr 2 17:11:19 CEST 2008 |
426 | 3.2 Wed Apr 2 17:11:19 CEST 2008 |
244 | - fix a 64 bit overflow issue in the select backend, |
427 | - fix a 64 bit overflow issue in the select backend, |