Subj : Re: stupid threading question ....
To   : comp.programming.threads
From : Daniel Rayment
Date : Mon Aug 15 2005 03:50 am

well i pretty much think (thought) the same thing that your saying that 
execution of functions wont matter since each thread has its own stack, 
and on a single processing machine all is good.  that function wouldnt 
be "called" activly and more than once at a time.

but how bout on a 2 or more processor machine?  in the unlikely event 
that 2 threads want to call the same function at the same time.   (Once 
again we are not talking about accessing data types or sharing global 
variable or anything that "obviously is bad").  ssuppose the function 
that gets called at the same time is

"DONT try to make sense of the numbers, i typed it on the fly  there is 
no logic  to the computation"

function int doit(int &a,  &b)
{
   int c, d;

   c = a + b;
   a = b *c;
   d = c - a;

  if (a<b) return d;
  else return c

}

all variables are local  or parameter reference.


thread::code()
{
  static int (*func)(int &, int &)fn = doit;

while (1)
{
  WaitForSingleObject( whatever, INFINITE);

  int a, b;
  (*fn)(a,b);
}

}

and of course under murphys law  both wake at same time and call the 
"doit"  function  supllyied as a pointer to func.

.