--- AnyEvent/README 2008/10/02 06:42:39 1.31 +++ AnyEvent/README 2008/11/21 01:36:22 1.34 @@ -1133,16 +1133,16 @@ Results name watchers bytes create invoke destroy comment - EV/EV 400000 244 0.56 0.46 0.31 EV native interface - EV/Any 100000 244 2.50 0.46 0.29 EV + AnyEvent watchers - CoroEV/Any 100000 244 2.49 0.44 0.29 coroutines + Coro::Signal - Perl/Any 100000 513 4.92 0.87 1.12 pure perl implementation - Event/Event 16000 516 31.88 31.30 0.85 Event native interface - Event/Any 16000 590 35.75 31.42 1.08 Event + AnyEvent watchers - Glib/Any 16000 1357 98.22 12.41 54.00 quadratic behaviour - Tk/Any 2000 1860 26.97 67.98 14.00 SEGV with >> 2000 watchers - POE/Event 2000 6644 108.64 736.02 14.73 via POE::Loop::Event - POE/Select 2000 6343 94.13 809.12 565.96 via POE::Loop::Select + EV/EV 400000 224 0.47 0.35 0.27 EV native interface + EV/Any 100000 224 2.88 0.34 0.27 EV + AnyEvent watchers + CoroEV/Any 100000 224 2.85 0.35 0.28 coroutines + Coro::Signal + Perl/Any 100000 452 4.13 0.73 0.95 pure perl implementation + Event/Event 16000 517 32.20 31.80 0.81 Event native interface + Event/Any 16000 590 35.85 31.55 1.06 Event + AnyEvent watchers + Glib/Any 16000 1357 102.33 12.31 51.00 quadratic behaviour + Tk/Any 2000 1860 27.20 66.31 14.00 SEGV with >> 2000 watchers + POE/Event 2000 6328 109.99 751.67 14.02 via POE::Loop::Event + POE/Select 2000 6027 94.54 809.13 579.80 via POE::Loop::Select Discussion The benchmark does *not* measure scalability of the event loop very @@ -1333,6 +1333,30 @@ * C-based event loops perform very well with small number of watchers, as the management overhead dominates. +SIGNALS + AnyEvent currently installs handlers for these signals: + + SIGCHLD + A handler for "SIGCHLD" is installed by AnyEvent's child watcher + emulation for event loops that do not support them natively. Also, + some event loops install a similar handler. + + SIGPIPE + A no-op handler is installed for "SIGPIPE" when $SIG{PIPE} is + "undef" when AnyEvent gets loaded. + + The rationale for this is that AnyEvent users usually do not really + depend on SIGPIPE delivery (which is purely an optimisation for + shell use, or badly-written programs), but "SIGPIPE" can cause + spurious and rare program exits as a lot of people do not expect + "SIGPIPE" when writing to some random socket. + + The rationale for installing a no-op handler as opposed to ignoring + it is that this way, the handler will be restored to defaults on + exec. + + Feel free to install your own handler, or reset it to defaults. + FORK Most event libraries are not fork-safe. The ones who are usually are because they rely on inefficient but fork-safe "select" or "poll" calls.