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This code is not intended as a good example of using threads, but is intended to show how to do bi-directional communications via a single socket under Win32.

It looks a little complicated because it is both client and server:

#! perl -slw use strict; use threads; use IO::Socket; $| = 1; ## The server. async { ## Create the listening port my $server = IO::Socket::INET->new( LocalHost => 'localhost', LocalPort => 9999, Listen => 5, Reuse => 1, ) or die $!; ## Accept connections while( my $client = $server->accept ) { ## Set the socket non-blocking ioctl( $client, 0x8004667e, \1 ) or die $^E; ## Start a thread to receive and display inbound packets async { my $in = ''; while( 1 ) { ## Use to accumulate whatever is available sysread( $client, $in, 100, length( $in ) ); ## When we've accumulated a complete line if( my $p = 1 + index $in, "\n" ) { ## display it and remove it from the buffer printf 'S: %s', substr $in, 0, $p+1, ''; } ## Stop the non-blocking read from running away with t +he cpu Win32::Sleep 100; } }; ## Start another thread to simulate input from other clients async { print $client 'Some text' while sleep 1; }; } }; ## The client ## Connect to the server my $server = IO::Socket::INET->new( 'localhost:9999' ) or die $!; ## Set the socket non-blocking ioctl( $server, 0x8004667e, \1 ); ## Start a thread to recieve and display input from the server async { my $in = ''; while( 1 ) { ## Accumulate input and display when we've got a full line sysread( $server, $in, 100, length( $in ) ); if( my $p = 1 + index $in, "\n" ) { printf 'C: %s', substr $in, 0, $p+1, ''; } Win32::Sleep 100; } }; ## Give the threads a chance to start sleep 2; ## The main thread reads from the keyboard and sends to the server. while( <STDIN> ) { print $server $_; }

NOTE: No 'select' in sight.


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In reply to Re: How to do simultaneous reads and writes to/from a socket? by BrowserUk
in thread How to do simultaneous reads and writes to/from a socket? by sonofason

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