--- AnyEvent/README 2012/04/13 09:57:41 1.70 +++ AnyEvent/README 2013/08/21 08:40:28 1.71 @@ -264,7 +264,7 @@ my $w = AnyEvent->timer (after => 0.5, interval => 1, cb => sub { warn "timeout\n"; - }; + }); TIMING ISSUES There are two ways to handle timers: based on real time (relative, "fire @@ -738,6 +738,10 @@ $cv->end; + ... + + my $results = $cv->recv; + This code fragment supposedly pings a number of hosts and calls "send" after results for all then have have been gathered - in any order. To achieve this, the code issues a call to "begin" when it @@ -776,10 +780,15 @@ Note that doing a blocking wait in a callback is not supported by any event loop, that is, recursive invocation of a blocking "->recv" - is not allowed, and the "recv" call will "croak" if such a condition - is detected. This condition can be slightly loosened by using - Coro::AnyEvent, which allows you to do a blocking "->recv" from any - thread that doesn't run the event loop itself. + is not allowed and the "recv" call will "croak" if such a condition + is detected. This requirement can be dropped by relying on + Coro::AnyEvent , which allows you to do a blocking "->recv" from any + thread that doesn't run the event loop itself. Coro::AnyEvent is + loaded automatically when Coro is used with AnyEvent, so code does + not need to do anything special to take advantage of that: any code + that would normally block your program because it calls "recv", be + executed in an "async" thread instead without blocking other + threads. Not all event models support a blocking wait - some die in that case (programs might want to do that to stay interactive), so *if you are @@ -1084,22 +1093,22 @@ non-exhaustive list), and the list is heavily biased towards modules of the AnyEvent author himself :) - AnyEvent::Util + AnyEvent::Util (part of the AnyEvent distribution) Contains various utility functions that replace often-used blocking functions such as "inet_aton" with event/callback-based versions. - AnyEvent::Socket + AnyEvent::Socket (part of the AnyEvent distribution) Provides various utility functions for (internet protocol) sockets, addresses and name resolution. Also functions to create non-blocking tcp connections or tcp servers, with IPv6 and SRV record support and more. - AnyEvent::Handle + AnyEvent::Handle (part of the AnyEvent distribution) Provide read and write buffers, manages watchers for reads and writes, supports raw and formatted I/O, I/O queued and fully transparent and non-blocking SSL/TLS (via AnyEvent::TLS). - AnyEvent::DNS + AnyEvent::DNS (part of the AnyEvent distribution) Provides rich asynchronous DNS resolver capabilities. AnyEvent::HTTP, AnyEvent::IRC, AnyEvent::XMPP, AnyEvent::GPSD, @@ -1108,7 +1117,7 @@ (for the curious, IGS is the International Go Server and FCP is the Freenet Client Protocol). - AnyEvent::AIO + AnyEvent::AIO (part of the AnyEvent distribution) Truly asynchronous (as opposed to non-blocking) I/O, should be in the toolbox of every event programmer. AnyEvent::AIO transparently fuses IO::AIO and AnyEvent together, giving AnyEvent access to @@ -2003,6 +2012,15 @@ its own. The pure-perl event loop (AnyEvent::Loop) will additionally load it to try to use a monotonic clock for timing stability. + AnyEvent::AIO (and IO::AIO) + The default implementation of AnyEvent::IO is to do I/O + synchronously, stopping programs while they access the disk, which + is fine for a lot of programs. + + Installing AnyEvent::AIO (and its IO::AIO dependency) makes it + switch to a true asynchronous implementation, so event processing + can continue even while waiting for disk I/O. + 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