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Subject: Re: POSIX threads

Author: Andreas Guettinger

Date: 02:12:17 07/05/05

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I don't agree in general. Doing posix programming right is surely no no-brainer.
I don't know how you come to this conclusion, maybe if one just starts to create
threads and uses no communication between them. Signaling and synchronisation
between threads is not so easy, i would definitely not call it a no-brainer.

On the other hand, if done correctly, it should also run on a dual CPU machine
with maybe some minor adjustements. Of course it has to be tested on the dual,
because there is always something going not the expected way.


On July 05, 2005 at 05:02:54, Lance Perkins wrote:

>Not true.
>Testing a multi-threaded app on a single-cpu machine is bogus. Its very easy to
>write a multi-threaded app. Its a no brianer. But to be sure that it actually
>works on a multi-cpu machine, you have to test it on one.
>On a single-cpu machine, the threads never run in parallel. A shared resource
>will never be accessed simultaneously.
>I have tons of horror stories about this from newbie programmers.
>On July 05, 2005 at 03:56:29, Steven Edwards wrote:
>>On July 05, 2005 at 03:31:42, Tord Romstad wrote:
>>>On July 04, 2005 at 23:36:39, Juan Pablo Naar C. wrote:
>>>>Is coding for SMP really hard?
>>>It is, especially when you don't have a dual CPU computer.
>>>There are still very few of us who have one.  Duals are still
>>>too big, noisy and expensive for the average customer.
>>>This will, of course, change in the future (probably in the
>>>near future).  When duals become more common, I am
>>>sure the number of parallell chess programs wil increase
>>If the host and target platforms are POSIX compliant (e.g., Mac OS/X and Linux),
>>then adherence to the POSIX thread model specification is relatively simple and
>>so an SMP-aware prgram can be developed and tested on a single CPU machine.
>>This is part of Symbolic's development method.

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