Apple

Thanks Derek (and Herb).

It was indeed the wrong header that was being included.

Once I removed the “Atomic” from the Compare function and went to its definition, the right header showed up.

Thank you for the help.

Carlos

From: Derek Kumar [mailto:email@hidden]
Sent: Tuesday, January 31, 2006 2:40 PM
To: email@hidden
Cc: email@hidden
Subject: Re: Problem using OSAtomic functions

Perhaps you're looking for OSCompareAndSwap()?

http://developer.apple.com/documentation/Darwin/Reference/KernellibkernFramework/OSAtomic/CompositePage.html

This page has some example usage:

http://developer.apple.com/documentation/DeviceDrivers/Conceptual/IOKitFundamentals/HandlingEvents/chapter_8_section_2.html

There's an OSAtomicCompareAndSwap(), but it's from the user mode C library.

(May be vaguely relevant: There was a mention of a possible gcc 4/xcode issue with search paths that I recall from a while ago. If possible, try passing the -v and --save-temps flags to gcc when building, and check (either from the verbose output, from the generated intermediate pre-processed file) that the correct header gets included).

Derek

On Jan 31, 2006, at 1:37 PM, Carlos Silva wrote:

Did I post this on the right list?

Has anyone ever used these functions at the kernel level?

TIA

From: darwin-kernel-bounces+csilva=email@hidden [mailto:darwin-kernel-bounces+csilva=email@hidden] On Behalf Of Carlos Silva
Sent: Friday, January 27, 2006 4:04 PM
To: email@hidden
Subject: Problem using OSAtomic functions

Hello,

I am writing a CoreAudio KEXT (based on the AudioReflectorDriver sample but I also tried with the PhantomDriver sample) and I can not use any of the functions included in <libkern/OSAtomic.h>..

I get a “was not declared in this scope” compilation error.

Here’s a code example:

#include <libkern/OSAtomic.h>

class foo

{

UInt32 Temp;

void f()

{

OSAtomicCompareAndSwap(1, 0, &Temp);

};

Any ideas?

Carlos

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References:
	>Re: Problem using OSAtomic functions (From: Derek Kumar <email@hidden>)