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Re: OSAtomic built-in operations
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Re: OSAtomic built-in operations


  • Subject: Re: OSAtomic built-in operations
  • From: Rick Mann <email@hidden>
  • Date: Sun, 06 May 2012 21:29:13 -0700

On May 6, 2012, at 17:11 , Stefan Werner wrote:

> Have you tried union{} ?
>
>    union {
>        int32_t s;
>        uint32_t u;
>    } atomicvar;
>    atomicvar.u = 0;
>    OSAtomicCompareAndSwap32(0, 1, &atomicvar.s);
>    OSAtomicOr32Orig(0, &atomicvar.u);

I've seen this technique in other places. Why is that better than just casting pointer types? Like this:

int32_t		s;
uint32_t	u;

u = *(uint32_t*) &s;


--
Rick


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References: 
 >OSAtomic built-in operations (From: Andreas Grosam <email@hidden>)
 >Re: OSAtomic built-in operations (From: Stefan Werner <email@hidden>)

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