server.pl 

    while ( defined ($response = <CLIENT>)){ 
    ...

[download]

client.pl 

    while ($line = <SOCKET>) { 
        print SOCKET "Client says hellooooo toooo !!!"; 
        SOCKET->autoflush(); 
        ...

[download]

One problem is that you're trying to read lines on the server side with <...> (aka readline), but on the client side you're not writing any newlines...  The effect of this is that the server hangs in $response = <CLIENT> waiting for a newline.

Note that flushing and a communication protocol involving newlines are two different things. In other words, flushing some output does not add a newline.

P.S.: SOCKET->autoflush sets an operation mode of the handle - as opposed to SOCKET->flush - so the former needs to be called only once.

In reply to Re: Socket deadlock doubt in code by almut
in thread Socket deadlock doubt in code by sajanagr

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