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Re: Note on PushbackInputStream

From: Bryce McKinlay
Subject: Re: Note on PushbackInputStream
Date: Fri, 10 Aug 2001 17:25:58 +1200
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.3) Gecko/20010801

Tom Tromey wrote:

Suppose a thread calls and there are no bytes
to be read.  So the thread blocks.

Now suppose another thread calls PushbackInputStream.unread.

Ideally you'd expect the first thread to wake up and read the
pushed-back bytes.  However, this doesn't happen.  And in fact it
isn't easy to make it happen.  I think you could do it by making a new
thread inside  That is awfully heavy though.

In general, I dont think its useful/safe to have more than one thread reading from any given InputStream, so in practise this probibly isnt a problem. Besides, even if there was a way to unblock another reading thread, there would still be consistency issues. If thread A reads a chunk of data, then thread B reads a chunk, then thread A decides to push back a byte, that byte would no longer be in the correct position on the stream.



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