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Full Discussion: How to use EPOLLOUT exactly?
Top Forums Programming How to use EPOLLOUT exactly? Post 302920510 by achenle on Thursday 9th of October 2014 05:51:21 PM
Old 10-09-2014
Quote:
Originally Posted by paulnewman
I am not returning everytime a socket is ready. I mentionned I was using EPOLLET.
Then if you don't get any input data, you'll never write your outgoing data because your thread is blocked in epoll_wait().

Quote:
and as Corona688 pointed out, send() could return EAGAIN. so I need to handle that in the reactor thread.
So? You have to handle that anyway. Why do you "need" to handle it in the reactor thread?

By putting the write()/send() calls into the same thread that does the epoll_wait(), you're opening yourself up to allowing write()/send() calls to starve out incoming connections.

You're also adding the ring buffer overhead and future O&M costs to maintain that code.
 
Mojo::IOLoop::Stream(3pm)				User Contributed Perl Documentation				 Mojo::IOLoop::Stream(3pm)

NAME
Mojo::IOLoop::Stream - Non-blocking I/O stream SYNOPSIS
use Mojo::IOLoop::Stream; # Create stream my $stream = Mojo::IOLoop::Stream->new($handle); $stream->on(read => sub { my ($stream, $chunk) = @_; ... }); $stream->on(close => sub { my $stream = shift; ... }); $stream->on(error => sub { my ($stream, $err) = @_; ... }); # Start and stop watching for new data $stream->start; $stream->stop; DESCRIPTION
Mojo::IOLoop::Stream is a container for I/O streams used by Mojo::IOLoop. EVENTS
Mojo::IOLoop::Stream can emit the following events. "close" $stream->on(close => sub { my $stream = shift; ... }); Emitted safely if the stream gets closed. "drain" $stream->on(drain => sub { my $stream = shift; ... }); Emitted safely once all data has been written. "error" $stream->on(error => sub { my ($stream, $err) = @_; ... }); Emitted safely if an error happens on the stream. "read" $stream->on(read => sub { my ($stream, $chunk) = @_; ... }); Emitted safely if new data arrives on the stream. "timeout" $stream->on(timeout => sub { my $stream = shift; ... }); Emitted safely if the stream has been inactive for too long and will get closed automatically. "write" $stream->on(write => sub { my ($stream, $chunk) = @_; ... }); Emitted safely if new data has been written to the stream. ATTRIBUTES
Mojo::IOLoop::Stream implements the following attributes. "reactor" my $reactor = $stream->reactor; $stream = $stream->reactor(Mojo::Reactor::Poll->new); Low level event reactor, defaults to the "reactor" attribute value of the global Mojo::IOLoop singleton. "timeout" my $timeout = $stream->timeout; $stream = $stream->timeout(45); Maximum amount of time in seconds stream can be inactive before getting closed automatically, defaults to 15. Setting the value to 0 will allow this stream to be inactive indefinitely. METHODS
Mojo::IOLoop::Stream inherits all methods from Mojo::EventEmitter and implements the following new ones. "new" my $stream = Mojo::IOLoop::Stream->new($handle); Construct a new Mojo::IOLoop::Stream object. "close" $stream->close; Close stream immediately. "handle" my $handle = $stream->handle; Get handle for stream. "is_readable" my $success = $stream->is_readable; Quick non-blocking check if stream is readable, useful for identifying tainted sockets. "is_writing" my $success = $stream->is_writing; Check if stream is writing. "start" $stream->start; Start watching for new data on the stream. "stop" $stream->stop; Stop watching for new data on the stream. "steal_handle" my $handle = $stream->steal_handle; Steal handle from stream and prevent it from getting closed automatically. "write" $stream->write('Hello!'); $stream->write('Hello!', sub {...}); Write data to stream, the optional drain callback will be invoked once all data has been written. SEE ALSO
Mojolicious, Mojolicious::Guides, <http://mojolicio.us>. perl v5.14.2 2012-09-05 Mojo::IOLoop::Stream(3pm)
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