From: "Eustáquio 'TaQ' Rangel" <eustaquiorangel@...>
Date: 2007-11-17T07:54:33+09:00
Subject: Re: Suggestion for native thread tests

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Hi Sasada!

> I can't understand what do you mean.  Where is a FIFO?  On my
> laptop, this code doesn't block, but continues to show file contents.

FIFO are named pipes. Here's the Wikipedia definition and some samples:
http://en.wikipedia.org/wiki/Named_pipe

On Linux it can be created with

mkfifo thread_test.fifo

It will create a pipe where you can send and read information. To make to stop
the blocking, we need to send something to the FIFO, like

echo "hi sasada!" > thread_test.fifo

Check this out: on a terminal, type:

mkfifo sasada.fifo
tail -f sasada.fifo

On another terminal, on the same dir, type:

echo "hi" > sasada.info
echo "sasada" > sasada.info

Back to the first console, the result is:

hi
sasada

Where it still wait for more contents till a ctrl+c.

On my example the FIFO works like a blocking operation, where the second thread
stops the other ones while there is no content to be read on the pipe. Using a
similar code on Java, all the threads runs even if the second one stops waiting
for some content. Don't know if this is a really valid example for checking for
native thread stuff, but I think if we go native one thread should not stop the
others.

Best regards,

- --
Eust�quio "TaQ" Rangel
http://eustaquiorangel.com

"Measuring programming progress by lines of code is like measuring aircraft
building progress by weight."
Bill Gates
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