[DUG] Threads again

[Myles Penlington]

Yes you need something. 

You can use InterlockedIncrement and InterlockedDecrement instead of
Inc/Dec.

 

Myles.

 

From: delphi-bounces at delphi.org.nz [mailto:delphi-bounces at delphi.org.nz]
On Behalf Of Ross Levis
Sent: Tuesday, 17 July 2007 04:02
To: 'NZ Borland Developers Group - Delphi List'
Subject: [DUG] Threads again

 

I'm trying to avoid using a critical section due to time overhead.  In
one thread I have a global integer incrementing roughly every 20
milliseconds using Inc(x,y).  In another thread I have the same integer
decreasing using Dec(x,y) at about the same speed.

 

Is it critical to have these in a critical section?  I've been testing
it here for a few days continuously and it appears to work fine without
one.

 

Even with a dual processor and each thread running on a separate
processor, is it possible for one memory location to be written
precisely at the same time?  It doesn't matter which occurs first or in
which order.

 

Cheers,

Ross.



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