On Mon, 18 Dec 2017 22:45:01 GMT "[email protected]" <[email protected]> wrote:
:>I don't remember where I found this snipet of code.
:>
:> LHI R1,-1 create lock (0xFFFFFFFF)
:> LHI R0,0 create expected lock (0)
:>LOOP CS R0,R1,LOCK If Lock = 0
:>* Store R1 into LOCK
:> BRZ DONE We Got The Lock
:>* Else, load LOCK into R0
:>TEST LT R0,LOCK Try Again (Simple fetch)
:> BRNZ TEST Still Locked
:> BRU LOOP No Longer Locked,
:>* Try CS Again
:>*
:>*
:>DONE CNOP 2,4 Proceed
:>LOCK DS A Full Word
:>In the code fragment above why is the LT (Load and Test) instruction
necessary ?
It isn't.
:>What was the author trying to accomplish after Compare and Swap ?
Create a spin loop?
--
Binyamin Dissen <[email protected]>
http://www.dissensoftware.com
Director, Dissen Software, Bar & Grill - Israel
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