On a 64bit fpc compile, and 64bit system with pointers, which interlocked exchange is best used? Aren't pointers on x64 64bit pointers? Shouldn't we be using InterlockedExhange64 code to access specific x64 swaps?

Thanks.

Andrew Brunner wrote

On a 64bit fpc compile, and 64bit system with pointers, which interlocked exchange is best used? Aren't pointers on x64 64bit pointers? Shouldn't we be using InterlockedExhange64 code to access specific x64 swaps?

Obviously a specific InterlockedExhangePtr() function would be appropriate.

-Michael

function InterLockedExchange (var Target: Pointer;Source : Pointer) :
Pointer;

always maps directly to InterLockedExchange64 on 64bit and InterLockedExchange on 32bit. See line 988 and 994 in systemh.inc

So you're fine using InterlockedExchange on pointers. The other version with longint is always 32bit no matter the platform

Andrew Brunner wrote

On a 64bit fpc compile, and 64bit system with pointers, which interlocked exchange is best used?

The one that matches the size of the data you are changing. The compiler will give an error if you try to use the wrong one.

Aren't pointers on x64 64bit pointers?

Yes.

Shouldn't we be using InterlockedExhange64 code to access specific x64 swaps?

If you mean "to swap pointers" with "specific x64 swaps", then no, that is not necessary. The overloaded pointer variant is automatically mapped to either the longint or int64 version depending on the target platform.

Jonas