33c
Subj : Re: Challenge: Multithreading & Synchronization
To   : comp.programming.threads
From : Chris Thomasson
Date : Fri May 27 2005 03:29 pm


>> I'm relatively new to this group, so if it is customary here to have
>> "atomic
>> reads and writes" mean "atomic reads and writes with respect to the CPU
>> instruction stream", apologies. It's hard to see how this definition of
>> "atomic" could be useful or even sensible, but to each his own.
>
>    Sadly, the word "atomic" is used several different ways.

OK. Here is a very simple question...


static int shared = 0;


CPU A
--------

for ( ;; )
{
  shared = 1;
}



CPU B
--------

for ( ;; )
{
  int local = shared;

  assert( local == 0 || local == 1 );
}




How many existing processors today could trip the assertion?

.

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